/*
*
*
* 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 javax.microedition.lcdui;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;
/**
* A <code>DateField</code> is an editable component for presenting
* date and time (calendar)
* information that may be placed into a <code>Form</code>. Value for
* this field can be
* initially set or left unset. If value is not set then the UI for the field
* shows this clearly. The field value for "not initialized
* state" is not valid
* value and <code>getDate()</code> for this state returns <code>null</code>.
* <p>
* Instance of a <code>DateField</code> can be configured to accept
* date or time information
* or both of them. This input mode configuration is done by
* <code>DATE</code>, <code>TIME</code> or
* <code>DATE_TIME</code> static fields of this
* class. <code>DATE</code> input mode allows to set only
* date information and <code>TIME</code> only time information
* (hours, minutes). <code>DATE_TIME</code>
* allows to set both clock time and date values.
* <p>
* In <code>TIME</code> input mode the date components of
* <code>Date</code> object
* must be set to the "zero epoch" value of January 1, 1970.
* <p>
* Calendar calculations in this field are based on default locale and defined
* time zone. Because of the calculations and different input modes date object
* may not contain same millisecond value when set to this field and get back
* from this field.
* @since MIDP 1.0
*/
public class DateField extends Item {
/**
* Input mode for date information (day, month, year). With this mode this
* <code>DateField</code> presents and allows only to modify date
* value. The time
* information of date object is ignored.
*
* <P>Value <code>1</code> is assigned to <code>DATE</code>.</P>
*/
public static final int DATE = 1;
/**
* Input mode for time information (hours and minutes). With this mode this
* <code>DateField</code> presents and allows only to modify
* time. The date components
* should be set to the "zero epoch" value of January 1, 1970 and
* should not be accessed.
*
* <P>Value <code>2</code> is assigned to <code>TIME</code>.</P>
*/
public static final int TIME = 2;
/**
* Input mode for date (day, month, year) and time (minutes, hours)
* information. With this mode this <code>DateField</code>
* presents and allows to modify
* both time and date information.
*
* <P>Value <code>3</code> is assigned to <code>DATE_TIME</code>.</P>
*/
public static final int DATE_TIME = 3;
/**
* Creates a <code>DateField</code> object with the specified
* label and mode. This call
* is identical to <code>DateField(label, mode, null)</code>.
*
* @param label item label
* @param mode the input mode, one of <code>DATE</code>, <code>TIME</code>
* or <code>DATE_TIME</code>
* @throws IllegalArgumentException if the input <code>mode's</code>
* value is invalid
*/
public DateField(String label, int mode) {
this(label, mode, null);
}
/**
* Creates a date field in which calendar calculations are based
* on specific
* <code>TimeZone</code> object and the default calendaring system for the
* current locale.
* The value of the <code>DateField</code> is initially in the
* "uninitialized" state.
* If <code>timeZone</code> is <code>null</code>, the system's
* default time zone is used.
*
* @param label item label
* @param mode the input mode, one of <code>DATE</code>, <code>TIME</code>
* or <code>DATE_TIME</code>
* @param timeZone a specific time zone, or <code>null</code> for the
* default time zone
* @throws IllegalArgumentException if the input <code>mode's</code> value
* is invalid
*/
public DateField(String label, int mode, java.util.TimeZone timeZone) {
super(label);
synchronized (Display.LCDUILock) {
if ((mode != DATE) && (mode != TIME) && (mode != DATE_TIME)) {
throw new IllegalArgumentException("Invalid input mode");
}
this.mode = mode;
if (timeZone == null) {
timeZone = TimeZone.getDefault();
}
this.currentDate = Calendar.getInstance(timeZone);
itemLF = dateFieldLF = LFFactory.getFactory().getDateFieldLF(this);
} // synchronized
}
/**
* Returns date value of this field. Returned value is
* <code>null</code> if field
* value is
* not initialized. The date object is constructed according the rules of
* locale specific calendaring system and defined time zone.
*
* In <code>TIME</code> mode field the date components are set to
* the "zero
* epoch" value of January 1, 1970. If a date object that presents
* time beyond one day from this "zero epoch" then this field
* is in "not
* initialized" state and this method returns <code>null</code>.
*
* In <code>DATE</code> mode field the time component of the calendar is
* set to zero when constructing the date object.
*
* @return date object representing time or date depending on input mode
* @see #setDate
*/
public java.util.Date getDate() {
synchronized (Display.LCDUILock) {
// NOTE:
// defensive copy of the Date object is necessary
// because CLDC's Calendar returns a reference to an internal,
// shared Date object. See bugID: 4479408.
// original:
// return (initialized ?
// new java.util.Date(currentDate.getTime().getTime()) : null);
if (initialized) {
java.util.Date retDate = dateFieldLF.lGetDate();
if (retDate == null) {
return new java.util.Date(currentDate.getTime().getTime());
} else {
return retDate;
}
}
return null;
} // synchronized
}
/**
* Sets a new value for this field. <code>null</code> can be
* passed to set the field
* state to "not initialized" state. The input mode of
* this field defines
* what components of passed <code>Date</code> object is used.<p>
*
* In <code>TIME</code> input mode the date components must be set
* to the "zero
* epoch" value of January 1, 1970. If a date object that presents
* time
* beyond one day then this field is in "not initialized" state.
* In <code>TIME</code> input mode the date component of
* <code>Date</code> object is ignored and time
* component is used to precision of minutes.<p>
*
* In <code>DATE</code> input mode the time component of
* <code>Date</code> object is ignored.<p>
*
* In <code>DATE_TIME</code> input mode the date and time
* component of <code>Date</code> are used but
* only to precision of minutes.
*
* @param date new value for this field
* @see #getDate
*/
public void setDate(java.util.Date date) {
synchronized (Display.LCDUILock) {
setDateImpl(date);
dateFieldLF.lSetDate(date);
} // synchronized
}
/**
* Gets input mode for this date field. Valid input modes are
* <code>DATE</code>, <code>TIME</code> and <code>DATE_TIME</code>.
*
* @return input mode of this field
* @see #setInputMode
*/
public int getInputMode() {
// SYNC NOTE: return of atomic value, no locking necessary
return mode;
}
/**
* Set input mode for this date field. Valid input modes are
* <code>DATE</code>, <code>TIME</code> and <code>DATE_TIME</code>.
*
* @param mode the input mode, must be one of <code>DATE</code>,
* <code>TIME</code> or <code>DATE_TIME</code>
* @throws IllegalArgumentException if an invalid value is specified
* @see #getInputMode
*/
public void setInputMode(int mode) {
if ((mode != DATE) && (mode != TIME) && (mode != DATE_TIME)) {
throw new IllegalArgumentException("Invalid input mode");
}
synchronized (Display.LCDUILock) {
if (this.mode != mode) {
this.mode = mode;
// While the input mode is changed
// some irrelevant values for new mode could be lost.
// Currently that is allowed by the spec.
// So for TIME mode we make sure that time is set
// on a zero epoch date
// and for DATE mode we zero out hours and minutes
if (mode == TIME) {
currentDate.set(Calendar.YEAR, 1970);
currentDate.set(Calendar.MONTH, Calendar.JANUARY);
currentDate.set(Calendar.DATE, 1);
} else if (mode == DATE) {
currentDate.set(Calendar.HOUR, 0);
currentDate.set(Calendar.HOUR_OF_DAY, 0);
currentDate.set(Calendar.MINUTE, 0);
}
dateFieldLF.lSetInputMode(mode);
}
} // synchronized
}
// package private
/**
* Sets the date.
* @param date the date value to set to.
*/
void setDateImpl(java.util.Date date) {
if (date == null) {
initialized = false;
} else {
currentDate.setTime(date);
if (mode == TIME) {
if (currentDate.getTime().getTime() >= 24*60*60*1000) {
initialized = false;
} else {
currentDate.set(Calendar.YEAR, 1970);
currentDate.set(Calendar.MONTH, Calendar.JANUARY);
currentDate.set(Calendar.DATE, 1);
initialized = true;
}
} else {
// Currently spec does not prohibit from losing
// irrelevant for that mode information
// so we always zero out hours and minutes
// NOTE: the specification doesn't prohibit
// the loss of information irrelevant to
// the current input mode, so we always zero out the
// hours and minutes.
if (mode == DATE) {
currentDate.set(Calendar.HOUR, 0);
currentDate.set(Calendar.HOUR_OF_DAY, 0);
currentDate.set(Calendar.MINUTE, 0);
}
initialized = true;
}
// always ignore seconds and milliseconds
currentDate.set(Calendar.SECOND, 0);
currentDate.set(Calendar.MILLISECOND, 0);
}
}
/**
* Return whether the Item takes user input focus.
*
* @return Always return <code>true</code>
*/
boolean acceptFocus() {
return true;
}
/**
* The look&feel associated with this DateField.
* Set in the constructor.
*/
DateFieldLF dateFieldLF; // = null
/**
* A flag indicating the initialization state of this DateField
*/
boolean initialized; // = false;
/**
* The mode of this DateField
*/
int mode;
/**
* The last saved date.
* This is used for making the last saved date bold.
*/
Calendar currentDate;
}
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