/*
*
*
* Copyright 1990-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
package com.sun.perseus.model;
import java.util.Vector;
/**
* The <code>TimedElementSupport</code> class is the main abstraction of the
* SMIL timing model implementation.
*
* <p>It is responsible for computing the animation's state (inactive, active,
* post-acitve, frozen) and, when the application is active, what the current
* simple time is. That simple time is then used by the animation engine to
* compute animated values. </p>
*
* <p>SMIL has a notion of time containers. A <code>TimedElementSupport</code>
* is the child of a time container. The relationship is that the element's
* current time is the container's simple time. In otherwords, sampling a
* container for a given time (in its own container), yields a simple time for
* the container. That simple time is the timed element's current time, used to
* compute the timed element's own simple time. Refer to the SMIL 2
* specification for an explanation of what the various time semantics are. </p>
*
* @version $Id: TimedElementSupport.java,v 1.7 2006/07/13 00:55:58 st125089 Exp $
*/
public class TimedElementSupport {
/**
* Last Simple Duration End event type.
*/
public static final String LAST_DUR_END_EVENT_TYPE = "lastDurEndEvent";
/**
* Seek End event type.
*/
public static final String SEEK_END_EVENT_TYPE = "seekEndEvent";
/**
* Seek End event type.
*/
public static final String SEEK_BEGIN_EVENT_TYPE = "seekBeginEvent";
/**
* End event type.
*/
public static final String END_EVENT_TYPE = "endEvent";
/**
* Begin event type.
*/
public static final String BEGIN_EVENT_TYPE = "beginEvent";
/**
* Repeat event type
*/
public static final String REPEAT_EVENT_TYPE = "repeat";
/**
* Used when this <code>TimedElement</code> can be restarted under
* any circumstance.
*/
public static final int RESTART_ALWAYS = 1;
/**
* Used when this <code>TimedElement</code> can only be restarted when
* it is not active (i.e., it does not have a current interval.
*/
public static final int RESTART_WHEN_NOT_ACTIVE = 2;
/**
* Used when this <code>TimedElement</code> cannot be restarted under
* any circumstance
*/
public static final int RESTART_NEVER = 3;
/**
* Used when this <code>TimedElement</code> should not modify the
* animated value when it is post active.
*/
public static final int FILL_BEHAVIOR_REMOVE = 1;
/**
* Used when this <code>TimedElement</code> should maintain the
* last value of its simple interval after it becomes inactive.
*/
public static final int FILL_BEHAVIOR_FREEZE = 2;
/**
* State before the element has been initialized
*/
protected static final int STATE_PRE_INIT = 1;
/**
* State where there has never been a current interval
* (since the last init).
*/
protected static final int STATE_NO_INTERVAL = 2;
/**
* State while the element is waiting to begin
* the first interval.
*/
protected static final int STATE_WAITING_INTERVAL_0 = 3;
/**
* State while the element is waiting to begin
* an interval other than the first one
*/
protected static final int STATE_WAITING_INTERVAL_N = 4;
/**
* State while the element is playing the current
* interval.
*/
protected static final int STATE_PLAYING = 5;
/**
* State when the element performs any fill on the previous
* interval.
*/
protected static final int STATE_FILL = 6;
/**
* This time value is used to avoid creating Time instances
* over and over again in animation loops, when dispatching
* events.
*/
protected final Time eventTime = new Time(0);
/**
* The element's state. One of the STATE_XXX constants.
*/
int state = STATE_PRE_INIT;
/**
* Controls whether the element is in this rare state
* where it is playing but its last simple duration
* is finished. In that state, the element is 'playing',
* but acting as if frozen.
*
* There are situations where the min attribute may cause the
* active duration to go beyond the time of the last simple
* duration instance. In that case, the element is still
* in the playing state, but we mark it as 'playFill', which
* means that it should behave almost as if in the fill state.
*/
boolean playFill = false;
/**
* The current iteration (only used while playing
*/
int curIter = 0;
/**
* This element's simple duration. This corresponds to the 'dur'
* attribute. Note that this is only one of the parameters that
* defines the actual simple duration.
*
* @see #simpleDur
* @see #computeSimpleDuration
*/
Time dur = Time.INDEFINITE;
/**
* The number of times this element repeats the simple duration.
* NaN means unspecified.
*/
float repeatCount = Float.NaN;
/**
* repeatDur set a limit on active duration length.
*/
Time repeatDur = null;
/**
* This element's implicit duration
*/
Time implicitDuration = Time.UNRESOLVED;
/**
* min sets a lower limit on the active duration.
*/
Time min = new Time(0);
/**
* max sets an upper limit on the active duration
*/
Time max = Time.INDEFINITE;
/**
* Defines the restart behavior for this element. This should be
* one of RESTART_ALWAYS, RESTART_WHEN_NOT_ACTIVE, RESTART_NEVER.
*/
int restart = RESTART_ALWAYS;
/**
* Defines the behavior after this element is no longer active.
* If FILL_BEHAVIOR_FILL, it means the element will keep sampling at the
* last simple duration time. If FILL_BEHAVIOR_REMOVE (the default),
* the effect of the animation is removed when the element is
* inactive (i.e., when it no longer has a current interval.
*/
int fillBehavior = FILL_BEHAVIOR_REMOVE;
/**
* A reference to this element's time container. This is initialized
* anytime the parent is set. This element's current time is the
* container's simple time.
*
* @see #setParent
*/
protected TimeContainerSupport timeContainer;
/**
* Keeps a reference to the current <code>TimeInterval</code>
*/
TimeInterval currentInterval;
/**
* Last local time (i.e., within the simple duration) this element
* was sampled at.
*/
long lastSampleTime = -1;
/**
* The simple duration for the current interval
* @see #computeSimpleDuration
*/
Time simpleDur = Time.UNRESOLVED;
/**
* Keeps a reference to the interval preceding the current one.
*/
TimeInterval previousInterval;
/**
* Keeps are reference to the last interval that was actually
* run.
*/
/**
* List of begin <code>TimeInstance</code>s.
*/
Vector beginInstances = new Vector(1);
/**
* List of end <code>TimeInstance</code>s.
*/
Vector endInstances = new Vector(1);
/**
* Begin <code>TimeCondition</code>s. Should _never_ be null.
*/
Vector beginConditions = new Vector(1);
/**
* End <code>TimeCondition</code>s. Should _never_ be null.
*/
Vector endConditions = new Vector(1);
/**
* List of <code>SyncBaseCondition</code>s depedent on this
* element's begin condition.
*/
Vector beginDependents;
/**
* List of <code>SyncBaseCondition</code>s dependent on this
* element's end condition.
*/
Vector endDependents;
/**
* The associated animation element.
*/
ModelNode animationElement;
/**
* Time dependency cycles detector. This flag is set to true
* when a timing update starts. There should only be one at
* a time, and it should always be set back to true after
* and timing update is complete.
*/
boolean timingUpdate = false;
/**
* The seeking flag is used when seeking to a particular time
* to prevent generation of beginEvent, endEvent and repeat
* event.
*/
boolean seeking = false;
/**
* Sets the repeat duration.
*
* @param repeatDur the new repeat duration.
* @throws IllegalStateException if the element is not in the
* STATE_PRE_INIT state.
*/
public void setRepeatDur(final Time repeatDur) {
checkPreInit();
this.repeatDur = repeatDur;
}
/**
* Sets the repeat count.
*
* @param repeatCount the new repeat count. Must be greater than
* zero.
* @throws IllegalStateException if the element is not in the
* STATE_PRE_INIT state.
*/
public void setRepeatCount(final float repeatCount) {
checkPreInit();
if (repeatCount <= 0) {
throw new IllegalArgumentException();
}
this.repeatCount = repeatCount;
}
/**
* Sets the restart strategy.
*
* @param restart the new restart strategy, one of
* RESTART_ALWAYS, RESTART_NEVER or RESTART_WHEN_NOT_ACTIVE.
* @throws IllegalStateException if the element is not in the
* STATE_PRE_INIT state.
*/
public void setRestart(final int restart) {
checkPreInit();
switch (restart) {
case RESTART_ALWAYS:
case RESTART_NEVER:
case RESTART_WHEN_NOT_ACTIVE:
this.restart = restart;
break;
default:
throw new IllegalArgumentException();
}
}
/**
* Sets the maximun active duration for any timed element
* interval.
*
* @param max the new maximum active duration. Should not be
* null.
* @throws IllegalStateException if the element is not in the
* STATE_PRE_INIT state.
*/
public void setMax(final Time max) {
checkPreInit();
if (max == null) {
throw new IllegalArgumentException();
}
this.max = max;
}
/**
* Sets the minimum active duration for any timed element interval.
*
* @param min the new minimum active duration. Should not be null.
* @throws IllegalStateException if the element is not in the
* STATE_PRE_INIT state.
*/
public void setMin(final Time min) {
checkPreInit();
if (min == null) {
throw new IllegalArgumentException();
}
this.min = min;
}
/**
* Sets the duration for this timed element
*
* @param dur the new element duration.
* @throws IllegalStateException if the element is not in the
* STATE_PRE_INIT state.
*/
public void setDur(final Time dur) {
checkPreInit();
this.dur = dur;
}
/**
* Sets the fill state behavior.
*
* @param fillBehavior the new fill strategy, one of FILL_BEHAVIOR_FREEZE or
* FILL_BEHAVIOR_REMOVE
* @throws IllegalStateException if the element is not in the
* STATE_PRE_INIT state.
*/
public void setFillBehavior(final int fillBehavior) {
checkPreInit();
switch (fillBehavior) {
case FILL_BEHAVIOR_FREEZE:
case FILL_BEHAVIOR_REMOVE:
this.fillBehavior = fillBehavior;
break;
default:
throw new IllegalArgumentException();
}
}
/**
* Implementation helper. Throws an exception if the element is
* not in the STATE_PRE_INIT state.
*
* @throws IllegalStateException if the element is not in the
* STATE_PRE_INIT state.
*/
public void checkPreInit() {
if (state != STATE_PRE_INIT) {
throw new IllegalStateException();
}
}
/**
* Calling this method causes a new <code>TimeInstance</code> to
* be inserted in the begin instance list. The behavior depends
* on the restart setting.
*/
public void begin() {
beginAt(0);
}
/**
* Calling this method causes a new <code>TimeInstance</code> to
* be inserted in the end instance list. This typically causes
* the current interval (if any), to be ended.
*/
public void end() {
endAt(0);
}
/**
* Calling this method causes a new <code>TimeInstance</code> to
* be inserted in the begin instance list. The behavior depends
* on the restart setting.
*
* @param offset the begin time inserted into the instance list
* is offset by 'offset' milliseconds from the current
* time.
*/
public void beginAt(final long offset) {
addInstance(true, offset);
}
/**
* Calling this method causes a new <code>TimeInstance</code> to
* be inserted in the end instance list. This typically causes
* the current interval (if any), to be ended.
*
* @param offset the end time inserted into the instance list
* is offset by 'offset' milliseconds from the current
* time.
*/
public void endAt(final long offset) {
addInstance(false, offset);
}
/**
* Adds a new <code>TimedInstance</code> with the specified offset
* to the begin or end instance list (depending on <code>isBegin</code>
*
* @param isBegin if true, the instance is a begin instance
* @param offset the instance offset from 0.
*/
void addInstance(final boolean isBegin,
final long offset) {
Time currentTime = getCurrentTime();
if (!currentTime.isResolved()) {
// If the current time is not resolved, it means the time
// container is not active. Therefore, there is no way
// we can add a new time instance that would be meaningful.
// So we do nothing.
return;
}
Time newTime = new Time(currentTime.value + offset);
TimeInstance newInstance
= new TimeInstance(this, newTime, true, isBegin);
}
/**
* Sets this timed element's time container
*
* @param timeContainer time container
*/
protected void setTimeContainer(final TimeContainerSupport timeContainer) {
if (this.timeContainer != null) {
this.timeContainer.timedElementChildren.removeElement(this);
}
this.timeContainer = timeContainer;
if (timeContainer != null) {
timeContainer.timedElementChildren.addElement(this);
if (timeContainer.state != STATE_PRE_INIT) {
// This is a live addition of an animation to a container.
// We need to initialize this timed element support.
initialize();
}
}
}
/**
* @return this TimedElement's container.
*/
protected TimeContainerSupport getTimeContainer() {
return timeContainer;
}
/**
* This method is called by the element's time container when it
* resets, i.e., when the container starts it's simple time again.
*
* This has the effect of:
* 1. clearing all the instance times which have the clearOnReset
* flag set to true.
* 2. compute the first interval.
*/
protected void initialize() {
// Clear instances with clearOnReset == true
reset();
// Compute the first interval
if (!checkNewInterval(computeFirstInterval())) {
state = STATE_NO_INTERVAL;
}
}
/**
* Calls all the registered <code>TimeDependent</code>s so that they
* are notified of a new TimeInterval creation.
*/
void dispatchOnNewInterval() {
int n = beginDependents == null ? 0 : beginDependents.size();
for (int i = 0; i < n; i++) {
((TimeDependent) beginDependents.elementAt(i)).onNewInterval(this);
}
n = endDependents == null ? 0 : endDependents.size();
for (int i = 0; i < n; i++) {
((TimeDependent) endDependents.elementAt(i)).onNewInterval(this);
}
}
/**
* @param after we are looking for a time greater than or equal
* to after.
* @param instances the Vector containing the TimeInstances to
* look up.
* @return the first value in the given instance list that
* starts after the input time.
*/
Time getTimeAfter(final Time after,
final Vector instances) {
int n = instances.size();
// NOTE: The following _assumes_ that the instances vector
// is sorted in increasing time order.
for (int i = 0; i < n; i++) {
TimeInstance timeInstance = (TimeInstance) instances.elementAt(i);
if (timeInstance.time.greaterThan(after)) {
return timeInstance.time;
}
}
return null;
}
/**
* @param after we are looking for a time greater than or equal
* to after.
* @param instances the Vector containing the TimeInstances to
* look up.
* @return the first value in the given instance list that
* starts strictly after the input time.
*/
Time getTimeAfterStrict(final Time after,
final Vector instances) {
int n = instances.size();
// NOTE: The following _assumes_ that the instances vector
// is sorted in increasing time order.
for (int i = 0; i < n; i++) {
TimeInstance timeInstance = (TimeInstance) instances.elementAt(i);
if (!after.greaterThan(timeInstance.time)) {
return timeInstance.time;
}
}
return null;
}
/**
* Computes the active end of this <code>TimedElement</code> for
* the given begin and end time constraints. This accounts for
* the other attributes which control or constrain the
* active duration.
*
* @param begin the input begin time. Should not be unresolved or null.
* @param end the proposed end time. May be null.
* @return the computed, constrained end time.
*
* @see <a
* href="http://www.w3.org/TR/smil20/smil-timing.html#Timing-ComputingActiveDur">
* SMIL 2: Computing the active duration</a>
*/
Time calculateActiveEnd(final Time begin, final Time end) {
Time result = end;
Time pad = null;
if (begin == null) {
throw new NullPointerException();
}
if (!begin.isResolved()) {
throw new IllegalArgumentException();
}
//
// In the context of this method, end and begin are the time instances
// passed to this method, and _not_ the begin and end attributes.
//
// If endTime is not null, and none of dur, repeatDur, and repeatCount
// are specified, then the simple duration is indefinite from the simple
// duration table above (see SMIL 2 spec), and the active duration is
// defined by the end value, according to the following cases:
//
// If end is resolved to a value, then pad = end - B,
//
// else, if end is indefinite, then pad = indefinite,
//
// else, if end is unresolved, then pad is unresolved, and needs to be
// recomputed when more information becomes available.
//
if (end != null
&& dur == null
&& repeatDur == null
&& Float.isNaN(repeatCount)) {
if (end.isResolved()) {
pad = new Time(end.value - begin.value);
} else if (end == Time.INDEFINITE) {
pad = Time.INDEFINITE;
} else {
pad = Time.UNRESOLVED;
}
}
// Else, if no end value is specified, or the end value is specified as
// indefinite, then the active duration is determined from the
// Intermediate Active Duration computation given below:
//
// pad = Result from Intermediate Active Duration Computation
else if (end == null || end == Time.INDEFINITE) {
pad =
calculateIntermediateActiveDuration(computeSimpleDuration(end));
}
// Otherwise, an end value not equal to indefinite is specified along
// with at least one of dur, repeatDur, and repeatCount. Then the pad is
// the minimum of the result from the Intermediate Active Duration
// Computation given below and duration between end and the element
// begin:
//
// pad = MIN( Result from Intermediate Active Duration Computation,
// end - B)
else {
pad =
calculateIntermediateActiveDuration(computeSimpleDuration(end));
Time pad2 = Time.UNRESOLVED;
if (end.isResolved()) {
pad2 = new Time(end.value - begin.value);
}
if (pad.greaterThan(pad2)) {
pad = pad2;
}
}
// Finally, the computed active duration ad is obtained by applying min
// and max semantics to the preliminary active duration pad. In the
// following expression, if there is no min value, substitute a value of
// 0, and if there is no max value, substitute a value of "indefinite":
//
// ad = MIN( max, MAX( min, pad ))
// Only do min/max constraint if min < max
boolean doMinMax = true;
if (min != null && max != null && !max.greaterThan(min)) {
doMinMax = false;
}
Time ad = null;
if (pad.isResolved()) {
ad = new Time(pad.value);
} else {
ad = pad;
}
if (doMinMax) {
// MAX( min, pad )
if (min != null && min.greaterThan(ad)) {
if (min.isResolved()) {
ad.value = min.value;
} else {
ad = min;
}
}
// MIN( max, MAX( min, pad ))
if (max != null && !max.greaterThan(ad)) {
if (max == Time.INDEFINITE) {
ad = Time.INDEFINITE;
} else {
if (ad.isResolved()) {
ad.value = max.value;
} else {
ad = new Time(max.value);
}
}
}
}
// We have computed the active duration. Now, offset that
// duration with the begin time to yield the computed end time.
if (ad.isResolved()) {
ad.value += begin.value;
}
// Finally, apply the restart behavior. If restart is always
// we check if there is any end time that is before active
// end time.
if (restart == RESTART_ALWAYS) {
Time restartBegin = getTimeAfterStrict(begin, beginInstances);
if (restartBegin != null && ad.greaterThan(restartBegin)) {
ad.value = restartBegin.value;
}
}
return ad;
}
/**
* Intermediate Active Duration Computation, as defined in the
* SMIL 2 specifications.
*
* @param p0 the element's simple duration. Should not be null
* @return the intermediate active duration.
* @see <a href="http://www.w3.org/TR/smil20/smil-timing.html#q81">
* Intermediate Active Duration Computation</a>
*/
final Time calculateIntermediateActiveDuration(final Time p0) {
if (p0 == null) {
throw new NullPointerException();
}
if (p0.isResolved() && p0.value == 0) {
return new Time(0);
} else if (repeatDur == null && Float.isNaN(repeatCount)) {
return p0;
} else {
Time p1 = Time.INDEFINITE;
Time p2 = repeatDur;
Time iad = Time.UNRESOLVED;
if (!Float.isNaN(repeatCount)) {
if (p0.isResolved()) {
if (repeatCount == Float.MAX_VALUE) {
p1 = Time.INDEFINITE;
} else {
p1 = new Time((long) (p0.value * repeatCount));
}
} else {
p1 = p0; // INDEFINITE or UNRESOLVED
}
}
if (p2 == null) {
p2 = Time.INDEFINITE;
}
iad = Time.INDEFINITE;
if (!p2.greaterThan(iad)) {
iad = p2;
}
if (!p1.greaterThan(iad)) {
iad = p1;
}
return iad;
}
}
/**
* Computes the element's simple duration, as defined in the
* SMIL 2 specification except that the 'media' value is
* not supported.
*
* For the purpose of computing the simple duration, an unspecified
* dur or an UNRESOLVED dur yield the same computed simple duration.
*
* @param end the interval end time. Can be null or have any Time
* value.
* @return the computed simple duration.
* @see <a
* href="http://www.w3.org/TR/smil20/smil-timing.html#Timing-DefiningSimpleDur">
* Defining the simple duration</a>
*/
final Time computeSimpleDuration(final Time end) {
Time implicitDur = getImplicitElementDuration();
// dur | implicit | repeatDur and | simpleDuration
// | duration | repeatCount |
// -------------+-------------+----------------+--------------------
// 1. unspecified | ignored | unspecified, | indefinite
// | | end specified |
// 2. Clock-value | ignored | ignored | dur or Clock-value
// 3. indefinite | ignored | ignored | indefinite
// 4. unspecified | resolved | ignored | implicit duration
// 5. unspecified | unresolved | ignored | unresolved
// -------------+-------------+----------------+--------------------
// First line case
if (dur == null && repeatDur == null
&& Float.isNaN(repeatCount) && end != Time.UNRESOLVED) {
return Time.INDEFINITE;
}
// Second & Third line case
if (dur != null && dur != Time.UNRESOLVED) {
return dur;
}
// Fourth line case. If we got to this point, we know
// dur is UNRESOLVED or null
if (implicitDur != Time.UNRESOLVED) {
return implicitDur;
} else {
// Fifth line
return Time.UNRESOLVED;
}
}
/**
* @return this element's implicit duration. Can be used for media such
* as audio and video where there is a natural, implicit duration.
*/
protected Time getImplicitElementDuration() {
return implicitDuration;
}
/**
* @return true if there is at least one event end condition.
*/
boolean endHasEventConditions() {
for (int i = 0; i < endConditions.size(); i++) {
if (endConditions.elementAt(i) instanceof EventBaseCondition) {
return true;
}
}
return false;
}
/**
* Computes the time of the last simple duration instance
* for the given time interval.
*
* @param ti the TimeInterval instance for which the time of the last
* simple duration instance should be computed.
*
* @return the input TimeInterval instance.
*/
TimeInterval computeLastDur(final TimeInterval ti) {
Time simpleDur = computeSimpleDuration(ti.end);
if (simpleDur != null) {
Time iad = calculateIntermediateActiveDuration(simpleDur);
if (iad.isResolved()) {
ti.lastDur = new Time(ti.begin.value + iad.value);
if (ti.lastDur.greaterThan(ti.end)) {
ti.lastDur = ti.end;
}
} else {
ti.lastDur = ti.end;
}
} else {
ti.lastDur = ti.end;
}
return ti;
}
/**
* The following computes the element's first interval, as defined
* in the SMIL specification.
*
* @return the first time interval
* @see <a
* href="http://www.w3.org/TR/smil20/smil-timing.html#Timing-BeginEnd-LC-Start">
* STARTUP - Getting the first interval</a>
*/
TimeInterval computeFirstInterval() {
Time beginAfter = new Time(Long.MIN_VALUE);
Time parentSimpleEnd = getContainerSimpleDuration();
while (true) { // loop till return
Time tempBegin = getTimeAfter(beginAfter, beginInstances);
if (tempBegin == null) {
return null; // No interval
}
if (tempBegin.greaterThan(parentSimpleEnd)) {
return null; // No interval
}
Time tempEnd = null;
if (endConditions.size() == 0) {
tempEnd = calculateActiveEnd(tempBegin, null);
} else {
tempEnd = getTimeAfter(tempBegin, endInstances);
if (tempBegin.isSameTime(tempEnd)) {
tempEnd = getTimeAfterStrict(tempEnd, endInstances);
}
if (tempEnd == null) {
if (endHasEventConditions() || endInstances.size() == 0) {
tempEnd = Time.UNRESOLVED;
} else {
return null; // No interval
}
}
tempEnd = calculateActiveEnd(tempBegin, tempEnd);
}
// We have an end - is it after the parent simple begin?
if (!tempEnd.isResolved() || tempEnd.value > 0) {
return computeLastDur(new TimeInterval(tempBegin, tempEnd));
} else {
beginAfter = tempEnd;
}
}
}
/**
* The following computes the element's next interval, as defined
* in the SMIL specification.
*
* @return the next interval given the current begin and end time instances.
* @see <a
* href="http://www.w3.org/TR/smil20/smil-timing.html#Timing-BeginEnd-LC-End">
* End of an interval</a>
*/
TimeInterval computeNextInterval() {
Time curEnd = previousInterval.end;
Time beginAfter = curEnd;
Time parentSimpleEnd = getContainerSimpleDuration();
Time tempBegin = getTimeAfter(beginAfter, beginInstances);
if (tempBegin == null) {
return null;
}
if (tempBegin.greaterThan(parentSimpleEnd)) {
return null;
}
Time tempEnd = null;
if (endConditions.size() == 0) {
tempEnd = calculateActiveEnd(tempBegin, null);
if (endInstances.size() > 0) {
// There is no end-attribute specified, but there are time
// instances. The SMIL Animation specification says that if
// there are times instances from DOM Events or DOM
// beginElementAt calls, they short cut the active duration.
//
// See: http://www.w3.org/TR/2001/REC-smil-animation-20010904/
// section 3.3.4.
//
Time tempEnd2 = getTimeAfter(tempBegin, endInstances);
if (tempEnd2 != null && tempEnd2.isResolved()) {
tempEnd = tempEnd2;
}
}
} else {
// We have a begin value - get an end
tempEnd = getTimeAfter(tempBegin, endInstances);
if (curEnd.isSameTime(tempEnd)) {
tempEnd = getTimeAfterStrict(tempEnd, endInstances);
}
if (tempEnd == null) {
if (endHasEventConditions() || endInstances.size() == 0) {
tempEnd = Time.UNRESOLVED;
} else {
return null;
}
}
tempEnd = calculateActiveEnd(tempBegin, tempEnd);
}
return computeLastDur(new TimeInterval(tempBegin, tempEnd));
}
/**
* Computes the end time corresponding to the input begin time.
*
* @param tempBegin the begin time for which to search an end time.
* @return the computed end time or null if there is no matching end.
*/
Time computeEndTime(final Time tempBegin) {
if (endInstances.size() == 0) {
return calculateActiveEnd(tempBegin, null);
} else {
Time tempEnd = getTimeAfter(tempBegin, endInstances);
if (tempBegin.isSameTime(tempEnd)) {
// IMPL NOTE : Do this to get a strictly superior end time
tempEnd = new Time(tempEnd.value + 1);
tempEnd = getTimeAfter(tempEnd, endInstances);
}
if (tempEnd == null) {
if (endHasEventConditions() || endInstances.size() == 0) {
tempEnd = Time.UNRESOLVED;
} else {
return null;
}
}
return calculateActiveEnd(tempBegin, tempEnd);
}
}
/**
* Resetting the element clears all of its 'clearOnReset' instances from the
* begin and end list. This includes event based time instances, time
* instances resulting from begin() or end() calls and resolved
* IntervalTimeInstance.
*/
void reset() {
currentInterval = null;
simpleDur = Time.UNRESOLVED;
previousInterval = null;
curIter = 0;
state = STATE_PRE_INIT;
lastSampleTime = -1;
int n = beginInstances.size();
for (int i = n - 1; i >= 0; i--) {
TimeInstance timeInstance
= (TimeInstance) beginInstances.elementAt(i);
if (timeInstance.clearOnReset) {
beginInstances.removeElementAt(i);
} else if (timeInstance instanceof IntervalTimeInstance) {
((IntervalTimeInstance) timeInstance).syncTime();
}
}
n = endInstances.size();
for (int i = n - 1; i >= 0; i--) {
TimeInstance timeInstance
= (TimeInstance) endInstances.elementAt(i);
if (timeInstance.clearOnReset) {
endInstances.removeElementAt(i);
} else if (timeInstance instanceof IntervalTimeInstance) {
((IntervalTimeInstance) timeInstance).syncTime();
}
}
}
/**
* Removes all <code>IntervalTimeInstance</code>s in the begin and end
* instance list if the syncBase is a descendant of syncTimeContainer
*
* @param syncTimeContainer the container under which
* <code>IntervalTimeInstance</code> should be removed.
*/
void removeSyncBaseTimesUnder
(final TimeContainerSupport syncTimeContainer) {
int n = beginInstances.size();
for (int i = n - 1; i >= 0; i--) {
TimeInstance timeInstance
= (TimeInstance) beginInstances.elementAt(i);
if (timeInstance instanceof IntervalTimeInstance) {
IntervalTimeInstance iti = (IntervalTimeInstance) timeInstance;
if (iti.syncBase.isDescendant(syncTimeContainer)) {
beginInstances.removeElementAt(i);
iti.dispose();
}
}
}
n = endInstances.size();
for (int i = n - 1; i >= 0; i--) {
TimeInstance timeInstance =
(TimeInstance) endInstances.elementAt(i);
if (timeInstance instanceof IntervalTimeInstance) {
IntervalTimeInstance iti = (IntervalTimeInstance) timeInstance;
if (iti.syncBase.isDescendant(syncTimeContainer)) {
endInstances.removeElementAt(i);
iti.dispose();
}
}
}
}
/**
* @param parent the time container which might be on the timed element's
* parent hierarchy.
* @return true if this timed element is equal to 'parent' or is a
* descendant of 'parent'
*/
boolean isDescendant(final TimeContainerSupport parent) {
if (parent == this) {
return true;
} else if (timeContainer != this) {
return timeContainer.isDescendant(parent);
} else {
return false;
}
}
/**
* Dispatches beginEvent. As per the SMIL 2 specification, this dispatches
* a beginEvent for the resolved begin time, not the observed begin
* time. It also dispatches any repeat event that might be needed.
*
* @param currentTime the current sampling time.
*
* @see <a
* href="http://www.w3.org/TR/smil20/smil-timing.html#Timing-BeginValueSemantics">
* SMIL2's Begin value semantics</a>
*/
void dispatchBeginEvent(final Time currentTime) {
if (animationElement != null) {
ModelEvent beginEvent = null;
if (seeking) {
beginEvent = animationElement.ownerDocument.initEngineEvent
(SEEK_BEGIN_EVENT_TYPE, animationElement);
} else {
beginEvent = animationElement.ownerDocument.initEngineEvent
(BEGIN_EVENT_TYPE, animationElement);
}
eventTime.value = currentInterval.begin.value;
beginEvent.eventTime = toRootContainerSimpleTimeClamp(eventTime);
animationElement.dispatchEvent(beginEvent);
}
dispatchRepeatEvent(currentTime);
}
/**
* Dispatches lastDurEndEvent.
*
* @see <a
* href="http://www.w3.org/TR/smil20/smil-timing.html#smil-timing-Timing-BeginEnd-Restart
* </a>
*/
void dispatchLastDurEndEvent() {
if (animationElement != null) {
ModelEvent event = animationElement.ownerDocument.initEngineEvent
(LAST_DUR_END_EVENT_TYPE, animationElement);
eventTime.value = currentInterval.lastDur.value;
event.eventTime = toRootContainerSimpleTimeClamp(eventTime);
animationElement.dispatchEvent(event);
}
}
/**
* Dispatches seekeEndEvent.
*
* @see <a
* href="http://www.w3.org/TR/smil20/smil-timing.html#smil-timing-Timing-BeginEnd-Restart
* </a>
*/
void dispatchSeekEndEvent() {
if (animationElement != null) {
ModelEvent event = animationElement.ownerDocument.initEngineEvent
(SEEK_END_EVENT_TYPE, animationElement);
animationElement.dispatchEvent(event);
}
}
/**
* Dispatches endEvent. As per the SMIL 2 specification, this dispatches an
* endEvent for the resolved end time, not the observed end time.
*
* @param currentTime the current sampling time.
*
* @see <a
* href="http://www.w3.org/TR/smil20/smil-timing.html#Timing-BeginValueSemantics">
* SMIL2's Begin value semantics</a>
*/
void dispatchEndEvent(final Time currentTime) {
if ((!seeking || state == STATE_PLAYING)
&& animationElement != null) {
ModelEvent endEvent = animationElement.ownerDocument.initEngineEvent
(END_EVENT_TYPE, animationElement);
if (seeking) {
// We are seeking to a new currentTime and the interval
// ends during the seek interval and the element was
// active at the time of seek. The time for the end
// event should be the time _before_ the seek
eventTime.value = getRootContainer().lastSampleTime.value;
endEvent.eventTime = eventTime;
} else {
eventTime.value = currentInterval.end.value;
endEvent.eventTime = toRootContainerSimpleTimeClamp(eventTime);
}
animationElement.dispatchEvent(endEvent);
}
dispatchRepeatEvent(currentTime);
}
/**
* Helper method.
*
* @return this timed element's root container.
*/
TimeContainerRootSupport getRootContainer() {
return timeContainer.getRootContainer();
}
/**
* Dispatches repeatEvent. As per the SMIL 2 specification, this dispatches
* a repeatEvent for the resolved end time, not the observed repeat
* time(s).
*
* @see <a
* href="http://www.w3.org/TR/smil20/smil-timing.html#Timing-BeginValueSemantics">
* SMIL2's Begin value semantics</a>
*/
void dispatchRepeatEvent(final Time currentTime) {
if (!seeking && simpleDur.isResolved()
&& simpleDur.value > 0) {
int prevIter = curIter;
Time maxTime = currentTime;
if (currentTime.greaterThan(currentInterval.end)) {
maxTime = currentInterval.end;
}
curIter = (int) ((maxTime.value - currentInterval.begin.value)
/
simpleDur.value);
if (curIter < 0) {
curIter = 0;
}
if (maxTime.isSameTime(currentInterval.end)
&&
((maxTime.value - currentInterval.begin.value)
%
simpleDur.value
== 0)) {
curIter--;
}
if (animationElement != null) {
for (int i = prevIter; i < curIter; i++) {
ModelEvent repeatEvent
= animationElement.ownerDocument.initEngineEvent
(REPEAT_EVENT_TYPE, animationElement);
// The event time is the time at which the repeat happened,
// not the time at which it was detected (that would be
// currentTime). So we have to compute the repeat time here
Time repeatTime = eventTime;
repeatTime.value = currentInterval.begin.value
+ (i + 1) * simpleDur.value;
repeatTime = toRootContainerSimpleTimeClamp(repeatTime);
repeatEvent.eventTime = repeatTime;
repeatEvent.repeatCount = i + 1;
animationElement.dispatchEvent(repeatEvent);
}
}
if (prevIter != curIter) {
onStartingRepeat(prevIter, curIter);
}
}
}
/**
* To be overridden by extensions (TimeContainerSupport) to do specific
* processing when a new iteration is started.
*
* @param prevIter the last iteration this element was playing.
* @param curIter the new iteration this element is playing.
*/
protected void onStartingRepeat(final int prevIter, final int curIter) {
}
/**
* Checks if the input interval is non null. If it is, that interval
* becomes the new currentInterval and the element sets its state
* accordingly.
*
* @param interval the interval to check.
* @return true if the candidate interval has become the current interval.
*/
boolean checkNewInterval(final TimeInterval interval) {
if (interval == null) {
return false;
} else {
currentInterval = interval;
simpleDur = computeSimpleDuration(currentInterval.end);
// Transition to the current state
// Note that we move to the 'playing' stage only in the
// sample method, where event dispatching is done as well.
if (previousInterval == null) {
state = STATE_WAITING_INTERVAL_0;
} else {
state = STATE_WAITING_INTERVAL_N;
}
// Notify dependents of the new interval
dispatchOnNewInterval();
return true;
}
}
/**
* Helper method to find the active interval, or next interval, for
* the requested time.
*
* @param seekToTime the time we are seeking the active or next interval
* for.
* @return the <code>TimeInterval</code> corresponding to
* <code>seekToTime</code>
*/
TimeInterval seekToInterval(final Time seekToTime) {
previousInterval = null;
TimeInterval interval = computeFirstInterval();
if (interval == null) {
return null;
}
while (interval != null && seekToTime.greaterThan(interval.end)) {
previousInterval = interval;
interval = computeNextInterval();
}
return interval;
}
/**
* Helper method.
*
* @return true if the root time container is flagged as seeking back.
*/
boolean isSeekingBack() {
return getRootContainer().seekingBack;
}
/**
* This method is typically called by this element's time container
* when it samples.
*
* Note that if this element is not in the waiting or playing
* state, this does nothing. This method assumes that successive
* calls are made with increasing time values.
*
* @param currentTime the time at which this element should be
* sampled.
*/
void sample(final Time currentTime) {
// Handle state transitions if there is a current interval
boolean endOfInterval = false;
boolean seekBack = false;
switch (state) {
default:
return;
case STATE_FILL:
if (seeking && isSeekingBack()) {
seekBack = true;
}
break;
case STATE_WAITING_INTERVAL_0:
if (currentTime.greaterThan(currentInterval.begin)) {
// This element has begun between the previous sampling
// and now. Dispatch the beginEvent.
dispatchBeginEvent(currentTime);
if (currentTime.greaterThan(currentInterval.end)) {
// This element has also ended between the
// previous sampling and now. Dispatch the endEvent
dispatchLastDurEndEvent();
dispatchEndEvent(currentTime);
endOfInterval = true;
}
state = STATE_PLAYING;
playFill = false;
}
break;
case STATE_WAITING_INTERVAL_N:
if (currentTime.greaterThan(currentInterval.begin)) {
// This element has begun between the previous sampling
// and now. Dispatch the beginEvent.
dispatchBeginEvent(currentTime);
if (currentTime.greaterThan(currentInterval.end)) {
// This element has also ended between the
// previous sampling and now. Dispatch the endEvent
dispatchLastDurEndEvent();
dispatchEndEvent(currentTime);
endOfInterval = true;
}
state = STATE_PLAYING;
playFill = false;
} else {
if (seeking && isSeekingBack()) {
seekBack = true;
}
}
break;
case STATE_PLAYING:
if (currentTime.greaterThan(currentInterval.lastDur)) {
if (!playFill) {
dispatchLastDurEndEvent();
playFill = true;
}
}
if (currentTime.greaterThan(currentInterval.end)) {
// This element has also ended between the
// previous sampling and now. Dispatch the endEvent
dispatchEndEvent(currentTime);
endOfInterval = true;
} else {
if (!seeking) {
dispatchRepeatEvent(currentTime);
} else if (currentInterval.begin.greaterThan(currentTime)) {
// We are seeking backwards and the current interval
// began during the seek interval. We need to
// dispatch and end event at the time before the
// seek.
dispatchLastDurEndEvent();
dispatchEndEvent(currentTime);
endOfInterval = true;
seekBack = true;
}
}
break;
}
// If we just finished an interval,
// we need to compute the new interval now
if (endOfInterval) {
previousInterval = currentInterval;
currentInterval = null;
// If we cannot restart, we just go to the fill state
if (restart == RESTART_NEVER) {
state = STATE_FILL;
playFill = false;
} else {
TimeInterval nextInterval = null;
if (!seekBack) {
nextInterval = computeNextInterval();
} else {
nextInterval = seekToInterval(currentTime);
}
if (!checkNewInterval(nextInterval)) {
// There is no next interval, we move to the
// fill state.
state = STATE_FILL;
playFill = false;
}
}
// This recursive call is needed in case we sample so far ahead
// that we are skipping several intervals.
// For example if the intervals are:
// [0, 1000[
// [2000, 3000[
// [5000, 6500[
// [8000, 1000[
// and we sample at 0 and then 7000
sample(currentTime);
return;
} else if (seekBack) {
// If we are in the FILL state and we cannot restart, then we stay
// in FILL state if seeking to after the previous interval's
// end. Otherwise, we move to the STATE_NO_INTERVAL state.
if (state == STATE_FILL && restart == RESTART_NEVER) {
if (previousInterval.end.greaterThan(currentTime)) {
dispatchSeekEndEvent();
state = STATE_NO_INTERVAL;
playFill = false;
return;
}
} else {
TimeInterval seekInterval = seekToInterval(currentTime);
// If the seek interval is the same as the current interval, we
// do not need to do further sampling because we were in, or
// have already moved to, the right interval.
if (seekInterval == null
|| currentInterval == null
|| !(seekInterval.begin.isSameTime(currentInterval.begin)
&&
seekInterval.end.isSameTime(currentInterval.end))) {
// We need to check if there is an interval active at the
// time we are seeking to.
if (!checkNewInterval(seekInterval)) {
// There is no currentInterval.
// Switch to the right state
if (previousInterval != null) {
state = STATE_FILL;
playFill = false;
} else {
dispatchSeekEndEvent();
state = STATE_NO_INTERVAL;
playFill = false;
return;
}
} else {
// There is an interval at the time we are
// seeking to. End the current interval (which
// we know is different because of the previous if
// statement) and sample again to have the new current
// interval kick-in.
dispatchSeekEndEvent();
sample(currentTime);
return;
}
}
}
}
//
// Different behaviors depending on the state. At this point, we
// should only be in one of the following states:
// - STATE_FILL
// - STATE_PLAYING
// - STATE_WAITING_INTERVAL_0
// - STATE_WAITING_INTERVAL_N
//
long localTime = 0;
switch (state) {
default:
// This should _never_ happen, given this method's code.
// This is extremely hard to test (would require changing
// state during the execution of this method) and does
// not need to be covered by the test suite.
throw new IllegalStateException();
case STATE_WAITING_INTERVAL_N:
case STATE_FILL:
if (fillBehavior == FILL_BEHAVIOR_FREEZE) {
// If we are in STATE_WAITING_INTERVAL_N or STATE_FILL,
// it means that we had a previous interval. Therefore,
// previousInterval is guaranteed to be not null.
localTime = previousInterval.lastDur.value
- previousInterval.begin.value;
} else {
return;
}
break;
case STATE_WAITING_INTERVAL_0:
return;
case STATE_PLAYING:
// If we are still in the PLAYING state but we are past the
// end of the last simple duration end, make sure we sample at
// that last simple duration time.
if (!playFill) {
localTime = currentTime.value - currentInterval.begin.value;
} else {
localTime = currentInterval.lastDur.value
- currentInterval.begin.value;
}
break;
}
// If we get to this point, it means we were able to
// compute a localTime we need to sample at. We are
// either playing the animation or we are in a frozen
// state. Compute the simple time from the localTime.
if (simpleDur.isResolved()) {
localTime = localTime % simpleDur.value;
if (state != STATE_PLAYING || playFill) {
// If we are not playing, it means we are frozen
// (either STATE_WAITING_N or STATE_FILL).
//
// Make sure we sample on the end of the simple time
// if we froze at the end of the interval.
//
// Note that we do not need to test if the value
// was 0 before %. Because we are _not_ playing, it
// means we are _not_ on the first value of the
// interval, therefore, we never run into the condition
// where localTime would be 0 before % and therefore,
// we do not need to test for that condition
//
if (localTime == 0) {
// Freeze on the last value in the simple duration
// interval only when we freeze.
localTime = simpleDur.value;
}
}
}
// At this point, we have computed our simple time.
// Ready to connect with the animation engine.
sampleAt(localTime);
// Keep the last simpleTime this element was sampled at
lastSampleTime = localTime;
}
/**
* Samples this element at the given simple time.
* Should be overridden for specific behaviors.
*
* @param simpleTime this timed element simple time.
*/
void sampleAt(final long simpleTime) {
}
/**
* Called when this element is the target of an hyperlink. The
* behavior is that defined in the SMIL 2 specification.
*
* @see <a
* href="http://www.w3.org/TR/smil20/smil-timing.html#Timing-HyperlinksAndTiming">
* SMIL 2 Specification</a>
*/
public void activate() {
// 1. If the target element is active, seek the document time back to
// the begin time of the current interval for the element.
if (state == STATE_PLAYING) {
Time seekToTime = new Time(currentInterval.begin.value);
seekToTime = toRootContainerSimpleTimeClamp(seekToTime);
if (seekToTime.isResolved()) {
seekTo(seekToTime);
return;
}
}
//
// 2. Else if the target element begin time is resolved (i.e. there is
// at least one interval defined for the element), seek the document
// time (forward or back, as needed) to the begin time of the first
// interval for the target element. Note that the begin time may be
// resolved as a result of an earlier hyperlink, DOM or event
// activation. Once the begin time is resolved (and until the element is
// reset, e.g. when the parent repeats), hyperlink traversal always
// seeks. For a discussion of "reset", see Resetting element state. Note
// also that for an element begin to be resolved, the begin time of all
// ancestor elements must also be resolved.
//
TimeInterval firstInterval = computeFirstInterval();
if (firstInterval != null) {
Time seekToTime = new Time(firstInterval.begin.value);
seekToTime = toRootContainerSimpleTimeClamp(seekToTime);
if (seekToTime.isResolved()) {
seekTo(seekToTime);
return;
}
}
// 3. Else (i.e. there are no defined intervals for the element), the
// target element begin time must be resolved. This may require seeking
// and/or resolving ancestor elements as well. This is done by recursing
// from the target element up to the closest ancestor element that has a
// resolved begin time (again noting that for an element to have a
// resolved begin time, all of its ancestors must have resolved begin
// times). Then, the recursion is "unwound", and for each ancestor in
// turn (beneath the resolved ancestor) as well as the target element,
// the following steps are performed:
//
// 1. If the element begin time is resolved, seek the document time
// (forward or back, as needed) to the begin time of the first
// interval for the target element.
//
// 2. Else (if the begin time is not resolved), just resolve the
// element begin time at the current time on its parent time
// container (given the current document position). Disregard the
// sync-base or event base of the element, and do not
// "back-propagate" any timing logic to resolve the element, but
// rather treat it as though it were defined with begin="indefinite"
// and just resolve begin time to the current parent time. This
// should create an interval and propagate to time dependents.
//
seekTo(Time.UNRESOLVED);
}
/**
* Implementation helper method for seekTo behavior.
*
* @param seekToTime the time to seek to.
*/
void seekTo(final Time seekToTime) {
if (seekToTime.isResolved()) {
// Now, move up the container graph.
timeContainer.seekTo(seekToTime);
} else {
// 3. Else (i.e. there are no defined intervals for the element),
// the target element begin time must be resolved. This may require
// seeking and/or resolving ancestor elements as well. This is done
// by recursing from the target element up to the closest ancestor
// element that has a resolved begin time (again noting that for an
// element to have a resolved begin time, all of its ancestors must
// have resolved begin times).
if (timeContainer.state != STATE_PLAYING) {
TimeInterval firstContainerInterval
= timeContainer.computeFirstInterval();
if (firstContainerInterval == null) {
timeContainer.seekTo(Time.UNRESOLVED);
} else {
Time parentSeekTo
= new Time(firstContainerInterval.begin.value);
parentSeekTo
= timeContainer
.toRootContainerSimpleTimeClamp(parentSeekTo);
timeContainer.seekTo(parentSeekTo);
}
}
// Then, the recursion is "unwound", and for each ancestor in turn
// (beneath the resolved ancestor) as well as the target element,
// the following steps are performed:
//
// 1. If the element begin time is resolved, seek the document
// time (forward or back, as needed) to the begin time of the
// first interval for the target element.
//
// 2. Else (if the begin time is not resolved), just resolve the
// element begin time at the current time on its parent time
// container (given the current document position). Disregard
// the sync-base or event base of the element, and do not
// "back-propagate" any timing logic to resolve the element, but
// rather treat it as though it were defined with
// begin="indefinite" and just resolve begin time to the current
// parent time. This should create an interval and propagate to
// time dependents.
//
TimeInterval firstInterval = computeFirstInterval();
if (firstInterval == null) {
begin();
firstInterval = computeFirstInterval();
}
Time goToTime = new Time(firstInterval.begin.value);
if (goToTime.value < 0) {
goToTime.value = 0;
}
timeContainer.seekTo(toRootContainerSimpleTimeClamp(goToTime));
}
}
/**
* Should be called whenever there is a change in the begin time instance
* list.
*/
private void reEvaluateBeginTime() {
switch (state) {
case STATE_WAITING_INTERVAL_0:
{
TimeInterval curInt = computeFirstInterval();
if (curInt != null) {
currentInterval.setBegin(curInt.begin);
currentInterval.setEnd(curInt.end);
computeLastDur(currentInterval);
} else {
// There no first interval any more, after
// the begin instance has been changed.
// We move back to the no interval state
pruneCurrentInterval();
}
}
break;
case STATE_WAITING_INTERVAL_N:
{
TimeInterval curInt = computeNextInterval();
if (curInt != null) {
currentInterval.setBegin(curInt.begin);
currentInterval.setEnd(curInt.end);
computeLastDur(currentInterval);
} else {
pruneCurrentInterval();
}
}
default:
return;
}
}
/**
* Recomputes the end time. This only does something if the
* element is playing or waiting to play, because it may update
* the currentInterval's end time.
*/
void reEvaluateEndTime() {
switch (state) {
case STATE_WAITING_INTERVAL_0:
case STATE_WAITING_INTERVAL_N:
case STATE_PLAYING:
// We are dealing with a new end time and the animation is
// playing. Re-evaluate the end time and update the
// current interval.
//
// Note that we cannot simply do a computeNextInterval as this
// might yield a begin time different from the one on the
// playing interval.
//
Time newEnd = computeEndTime(currentInterval.begin);
// It is unclear what should happen here if newEnd is null.
// This could happen if a list of end times was empty and
// a SyncBaseCondition, for example, inserts a new end instance
// that is _before_ the currentInterval's begin time. In that
// situation, should we just ignore newEnd or should we
// prune the currentInterval (if WAITING_0 or WAITING_N) and
// stop it (if PLAYING)?
//
// Pending further investigation of this corner case, we simply
// ignore a null newEnd
if (newEnd != null) {
currentInterval.setEnd(newEnd);
computeLastDur(currentInterval);
}
break;
default:
break;
}
}
/**
* Helper method invoked when the current interval becomes invalid
* after re-evaluation of the begin and end instances.
*
* @see <a href="file:///D:/work/doc/specs/smil20.html#smil-timing-q86">
* SMIL 2: Principles for building and pruning intervals</a>
*/
private void pruneCurrentInterval() {
TimeInterval prunedInterval = currentInterval;
currentInterval = null;
if (previousInterval != null) {
state = STATE_FILL;
} else {
state = STATE_NO_INTERVAL;
}
prunedInterval.prune();
}
/**
* This method inserts the input time instance in the instance list
*
* @param newInstance the instance to reposition in its instance list
* @see #addTimeInstance
* @see #onTimeInstanceUpdate
*/
private void insertTimeInstance(final TimeInstance newInstance) {
Vector instances = beginInstances;
if (!newInstance.isBegin) {
instances = endInstances;
}
int n = instances.size();
int i = 0;
Time newTime = newInstance.time;
for (i = 0; i < n; i++) {
TimeInstance timeInstance
= (TimeInstance) instances.elementAt(i);
if (!newTime.greaterThan(timeInstance.time)) {
instances.insertElementAt(newInstance, i);
break;
}
}
if (i == n) {
instances.addElement(newInstance);
}
}
/**
* Called to add a new <code>TimeInstance</code> to the begin or end
* instance list (depending on the new instance's <code>isBegin</code>
* setting).
*
* This is also called as a result of invoking beginAt or endAt.
*
* @param newInstance the new <code>TimeInstance</code> to add to the
* list. Should not be null.
* @see #beginAt
* @see #endAt
* @see <a
* href="http://www.w3.org/TR/smil20/smil-timing.html#Timing-BeginEnd-Restart">
* SMIL 2, Interaction with restart semantic</a>
*/
void addTimeInstance(final TimeInstance newInstance) {
if (timingUpdate) {
// We are in a timing dependency cycle. Break now.
return;
}
timingUpdate = true;
try {
insertTimeInstance(newInstance);
// Do not handle instance time list changes if we are
// initializing the time graph.
if (state == STATE_PRE_INIT) {
return;
}
if (!newInstance.isBegin) {
reEvaluateEndTime();
return;
}
// Impact the current interval if needed
switch (state) {
case STATE_NO_INTERVAL:
checkNewInterval(computeFirstInterval());
break;
case STATE_FILL:
if (restart != RESTART_NEVER) {
checkNewInterval(computeNextInterval());
}
// Else, don't do anything: this element cannot
// restart.
break;
case STATE_WAITING_INTERVAL_0:
{
TimeInterval curInt = computeFirstInterval();
if (curInt != null) {
currentInterval.setBegin(curInt.begin);
currentInterval.setEnd(curInt.end);
computeLastDur(currentInterval);
}
}
break;
case STATE_WAITING_INTERVAL_N:
{
TimeInterval curInt = computeNextInterval();
// We just added a new time instance. It is not possible
// that adding a time instance would make
// computeNextInterval return a null interval here.
// So we do not test for a null condition because it
// can't happen. If it happens,
// it means there is a bug in computeNextInterval or that
// the beginInstance list was messed with, which should not
// happen.
currentInterval.setBegin(curInt.begin);
currentInterval.setEnd(curInt.end);
computeLastDur(currentInterval);
}
break;
case STATE_PLAYING:
if (newInstance.isBegin) {
if (restart == RESTART_ALWAYS) {
if (currentInterval.end
.greaterThan(newInstance.time)
&&
newInstance.time
.greaterThan(currentInterval.begin)) {
// Update the current interval end time with this
// new begin time.
currentInterval.setEnd(newInstance.time);
computeLastDur(currentInterval);
// Next interval will be computed in the next call
// to sample();
}
// Ignore the new instance if it if falls after or
// before the current interval
}
// Ignore the new instance if we cannot restart this
// animation.
}
break;
default:
throw new IllegalStateException();
}
} finally {
timingUpdate = false;
}
}
/**
* Called by <code>TimeInstance</code>s when they are updated.
* In response, the TimedElement may recompute its current
* interval.
*
* @param timeInstance the <code>TimeInstance</code> that was just
* updated.
*
* @throws NullPointerException if timeInstance is null.
*
* @see <a
* href="http://www.w3.org/TR/smil20/smil-timing.html#Timing-SemanticsOfTimingModel">
* SMIL 2: Building the instance times lists</a>
*/
void onTimeInstanceUpdate(final TimeInstance timeInstance) {
if (timingUpdate) {
// We are in a timing dependency cycle, break now.
return;
}
timingUpdate = true;
try {
// First, reposition the instance in the instance list
if (timeInstance.isBegin) {
beginInstances.removeElement(timeInstance);
} else {
endInstances.removeElement(timeInstance);
}
insertTimeInstance(timeInstance);
if (state == STATE_PRE_INIT) {
return;
}
if (timeInstance.isBegin) {
// We are dealing with a begin instance change.
reEvaluateBeginTime();
} else {
// We are dealing with an end time instance.
reEvaluateEndTime();
}
} finally {
timingUpdate = false;
}
}
/**
* Called to remove a <code>TimeInstance</code> when a
* <code>TimeInterval</code> is pruned. This causes a re-evaluation
* of the current interval's begin or end time.
*
* @param timeInstance the instance to remove from its instance list.
*/
void removeTimeInstance(final TimeInstance timeInstance) {
if (timeInstance.isBegin) {
beginInstances.removeElement(timeInstance);
} else {
endInstances.removeElement(timeInstance);
}
if (timingUpdate) {
return;
}
timingUpdate = true;
try {
if (state != STATE_PRE_INIT) {
if (timeInstance.isBegin) {
reEvaluateBeginTime();
} else {
reEvaluateEndTime();
}
}
} finally {
timingUpdate = false;
}
}
/**
* Called by <code>TimeCondition</code>s when they are constructed.
*
* @param newCondition the new <code>TimeCondition</code> to add to the
* list. Should not be null.
*/
void addTimeCondition(final TimeCondition newCondition) {
if (newCondition.isBegin) {
beginConditions.addElement(newCondition);
} else {
endConditions.addElement(newCondition);
}
}
/**
* @param eventCondition the <code>EventBaseCondition</code> to check
* against.
* @return true if this <code>TimedElement</code> has a begin condition
* corresponding to the input <code>EventBaseCondition</code>
*/
boolean hasBeginCondition(final EventBaseCondition eventCondition) {
int n = beginConditions.size();
for (int i = 0; i < n; i++) {
TimeCondition condition =
(TimeCondition) beginConditions.elementAt(i);
if (condition instanceof EventBaseCondition) {
EventBaseCondition beginCondition =
(EventBaseCondition) condition;
if (beginCondition.eventType.equals(eventCondition.eventType)
&&
beginCondition.eventBase == eventCondition.eventBase) {
return true;
}
}
}
return false;
}
/**
* @return this <code>TimedElement</code>'s current time.
*/
Time getCurrentTime() {
return timeContainer.getSimpleTime();
}
/**
* Converts the input 'local' time to an absolute wallclock time.
*
* @param localTime the time to convert to wallclock time
* @return the time converted to an absolute wallclock time.
*/
long toWallClockTime(final long localTime) {
return timeContainer.toWallClockTime(localTime);
}
/**
* Converts the input simple time (i.e., a time in the parent container's
* simple duration) to a root container simple time (i.e., a time
* in the root time container's simple time interval). Note that this method
* mutates the input time value. If the associated time container does not
* have a current interval, this method returns Time.UNRESOLVED.
*
* @param simpleTime the time in the parent container's simple duration.
* Should not be null. If simpleTime is Time.UNRESOLVED, the returned
* time is UNRESOLVED. If simpleTime is Time.INDEFINITE, the returned
* time is INDEFINITE.
* @return a time in the root time container's simple duration (i.e., in
* the root container's simple time interval).
*/
Time toRootContainerSimpleTime(Time simpleTime) {
if (timeContainer.currentInterval == null) {
return Time.UNRESOLVED;
}
if (!simpleTime.isResolved()) {
return simpleTime;
}
// Convert to the container's container simple time
// Account for repeat behavior. This yields a time
// in the [0, ActiveTime[ time system
if (timeContainer.simpleDur.isResolved()) {
simpleTime.value +=
timeContainer.curIter * timeContainer.simpleDur.value;
}
// By adding the timeContainer's begin value, we are
// translating the simpleTime to a time in the container's
// container simple duration [0, simpleDur[ interval.
simpleTime.value += timeContainer.currentInterval.begin.value;
// Now, move the conversion one level up.
return timeContainer.toRootContainerSimpleTime(simpleTime);
}
/**
* Same definition and behavior as toRootContainerSimpleTime, except that
* this method clamps values to the container's simple duration. This
* means that a value smaller than zero is converted to 0 and a value
* greater than the simple duration is reduced to the simple duration.
*
* @param simpleTime the time in the parent container's simple duration.
* Should not be null. If simpleTime is Time.UNRESOLVED, the returned
* time is UNRESOLVED. If simpleTime is Time.INDEFINITE, the returned
* time is INDEFINITE.
* @return a time in the root time container's simple duration (i.e., in
* the root container's simple time interval).
*/
Time toRootContainerSimpleTimeClamp(final Time simpleTime) {
if (timeContainer.currentInterval == null) {
return Time.UNRESOLVED;
}
if (!simpleTime.isResolved()) {
return simpleTime;
}
// Clamp to zero.
if (simpleTime.value < 0) {
simpleTime.value = 0;
}
// Convert to the container's _container_ simple time
// Account for repeat behavior. This yields a time
// in the [0, ActiveTime[ time system
if (timeContainer.simpleDur.isResolved()) {
// Clamp to the simple duration.
if (simpleTime.value > timeContainer.simpleDur.value) {
simpleTime.value = timeContainer.simpleDur.value;
}
simpleTime.value +=
timeContainer.curIter * timeContainer.simpleDur.value;
} else {
// Still clamp to the container's active duration.
if (timeContainer.currentInterval.end.isResolved()) {
long maxDur = timeContainer.currentInterval.end.value
- timeContainer.currentInterval.begin.value;
if (simpleTime.value > maxDur) {
simpleTime.value = maxDur;
}
}
}
// By adding the timeContainer's begin value, we are
// translating the simpleTime to a time in the container's
// container simple duration [0, simpleDur[ interval.
simpleTime.value += timeContainer.currentInterval.begin.value;
// Now, move the conversion one level up.
return timeContainer.toRootContainerSimpleTimeClamp(simpleTime);
}
/**
* Converts the input root container simple time (i.e., a time in the root
* container's simple time interval) to a time in this element's time
* container simple duration. Note that this method mutates the input
* argument. If the associated time container does not
* have a current interval, this method returns Time.UNRESOLVED.
*
* @param simpleTime the time in the root container's simple duration. If
* simpleTime is Time.UNRESOLVED, the returned time is UNRESOLVED. If
* simpleTime is Time.INDEFINITE, the returned time is INDEFINITE.
*
* @return a simple time in the parent container's simple duration The
* return value is in the [0, container simple duration] interval.
*/
Time toContainerSimpleTime(Time simpleTime) {
if (timeContainer.currentInterval == null) {
return Time.UNRESOLVED;
}
if (!simpleTime.isResolved()) {
return simpleTime;
}
// Convertion to the container's container simple time
simpleTime = timeContainer.toContainerSimpleTime(simpleTime);
// Account for the container's begin value
simpleTime.value -= timeContainer.currentInterval.begin.value;
// Account for repeat behavior
if (timeContainer.simpleDur.isResolved()) {
simpleTime.value -=
timeContainer.curIter * timeContainer.simpleDur.value;
}
return simpleTime;
}
/**
* @return the container's simple duration.
*/
Time getContainerSimpleDuration() {
return timeContainer.simpleDur;
}
/**
* Debug helper.
* @return a description of this object.
*/
public String toString() {
String str = "[Animation: " + animationElement + "] ["
+ getStateString() + "]";
switch (state) {
case STATE_WAITING_INTERVAL_N:
case STATE_WAITING_INTERVAL_0:
case STATE_PLAYING:
str += "["
+ currentInterval.begin
+ ", "
+ currentInterval.end
/*
+ ", "
+ currentInterval.lastDur
*/
+ "]";
break;
default:
break;
}
return str;
}
/**
* Debug helper. Converts the state to a string.
*
* @return a string describing the element's state.
*/
String getStateString() {
switch (state) {
case STATE_PRE_INIT:
return "PRE_INIT";
case STATE_WAITING_INTERVAL_0:
return "WAITING_INTERVAL_0";
case STATE_WAITING_INTERVAL_N:
return "WAITING_INTERVAL_N";
case STATE_NO_INTERVAL:
return "NO_INTERVAL";
case STATE_FILL:
return "FILL";
case STATE_PLAYING:
return "PLAYING";
default:
return "UNKNOWN";
}
}
}
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