/*
* @(#)Level.java 1.19 04/02/25
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.util.logging;
import java.util.ResourceBundle;
/**
* The Level class defines a set of standard logging levels that
* can be used to control logging output. The logging Level objects
* are ordered and are specified by ordered integers. Enabling logging
* at a given level also enables logging at all higher levels.
* <p>
* Clients should normally use the predefined Level constants such
* as Level.SEVERE.
* <p>
* The levels in descending order are:
* <ul>
* <li>SEVERE (highest value)
* <li>WARNING
* <li>INFO
* <li>CONFIG
* <li>FINE
* <li>FINER
* <li>FINEST (lowest value)
* </ul>
* In addition there is a level OFF that can be used to turn
* off logging, and a level ALL that can be used to enable
* logging of all messages.
* <p>
* It is possible for third parties to define additional logging
* levels by subclassing Level. In such cases subclasses should
* take care to chose unique integer level values and to ensure that
* they maintain the Object uniqueness property across serialization
* by defining a suitable readResolve method.
*
* @version 1.19, 02/25/04
* @since 1.4
*/
public class Level implements java.io.Serializable {
private static java.util.ArrayList known = new java.util.ArrayList();
private static String defaultBundle = "sun.util.logging.resources.logging";
/**
* @serial The non-localized name of the level.
*/
private final String name;
/**
* @serial The integer value of the level.
*/
private final int value;
/**
* @serial The resource bundle name to be used in localizing the level name.
*/
private final String resourceBundleName;
/**
* OFF is a special level that can be used to turn off logging.
* This level is initialized to <CODE>Integer.MAX_VALUE</CODE>.
*/
public static final Level OFF = new Level("OFF",Integer.MAX_VALUE, defaultBundle);
/**
* SEVERE is a message level indicating a serious failure.
* <p>
* In general SEVERE messages should describe events that are
* of considerable importance and which will prevent normal
* program execution. They should be reasonably intelligible
* to end users and to system administrators.
* This level is initialized to <CODE>1000</CODE>.
*/
public static final Level SEVERE = new Level("SEVERE",1000, defaultBundle);
/**
* WARNING is a message level indicating a potential problem.
* <p>
* In general WARNING messages should describe events that will
* be of interest to end users or system managers, or which
* indicate potential problems.
* This level is initialized to <CODE>900</CODE>.
*/
public static final Level WARNING = new Level("WARNING", 900, defaultBundle);
/**
* INFO is a message level for informational messages.
* <p>
* Typically INFO messages will be written to the console
* or its equivalent. So the INFO level should only be
* used for reasonably significant messages that will
* make sense to end users and system admins.
* This level is initialized to <CODE>800</CODE>.
*/
public static final Level INFO = new Level("INFO", 800, defaultBundle);
/**
* CONFIG is a message level for static configuration messages.
* <p>
* CONFIG messages are intended to provide a variety of static
* configuration information, to assist in debugging problems
* that may be associated with particular configurations.
* For example, CONFIG message might include the CPU type,
* the graphics depth, the GUI look-and-feel, etc.
* This level is initialized to <CODE>700</CODE>.
*/
public static final Level CONFIG = new Level("CONFIG", 700, defaultBundle);
/**
* FINE is a message level providing tracing information.
* <p>
* All of FINE, FINER, and FINEST are intended for relatively
* detailed tracing. The exact meaning of the three levels will
* vary between subsystems, but in general, FINEST should be used
* for the most voluminous detailed output, FINER for somewhat
* less detailed output, and FINE for the lowest volume (and
* most important) messages.
* <p>
* In general the FINE level should be used for information
* that will be broadly interesting to developers who do not have
* a specialized interest in the specific subsystem.
* <p>
* FINE messages might include things like minor (recoverable)
* failures. Issues indicating potential performance problems
* are also worth logging as FINE.
* This level is initialized to <CODE>500</CODE>.
*/
public static final Level FINE = new Level("FINE", 500, defaultBundle);
/**
* FINER indicates a fairly detailed tracing message.
* By default logging calls for entering, returning, or throwing
* an exception are traced at this level.
* This level is initialized to <CODE>400</CODE>.
*/
public static final Level FINER = new Level("FINER", 400, defaultBundle);
/**
* FINEST indicates a highly detailed tracing message.
* This level is initialized to <CODE>300</CODE>.
*/
public static final Level FINEST = new Level("FINEST", 300, defaultBundle);
/**
* ALL indicates that all messages should be logged.
* This level is initialized to <CODE>Integer.MIN_VALUE</CODE>.
*/
public static final Level ALL = new Level("ALL", Integer.MIN_VALUE, defaultBundle);
/**
* Create a named Level with a given integer value.
* <p>
* Note that this constructor is "protected" to allow subclassing.
* In general clients of logging should use one of the constant Level
* objects such as SEVERE or FINEST. However, if clients need to
* add new logging levels, they may subclass Level and define new
* constants.
* @param name the name of the Level, for example "SEVERE".
* @param value an integer value for the level.
* @throws NullPointerException if the name is null
*/
protected Level(String name, int value) {
this(name, value, null);
}
/**
* Create a named Level with a given integer value and a
* given localization resource name.
* <p>
* @param name the name of the Level, for example "SEVERE".
* @param value an integer value for the level.
* @param resourceBundleName name of a resource bundle to use in
* localizing the given name. If the resourceBundleName is null
* or an empty string, it is ignored.
* @throws NullPointerException if the name is null
*/
protected Level(String name, int value, String resourceBundleName) {
if (name == null) {
throw new NullPointerException();
}
this.name = name;
this.value = value;
this.resourceBundleName = resourceBundleName;
synchronized (Level.class) {
known.add(this);
}
}
/**
* Return the level's localization resource bundle name, or
* null if no localization bundle is defined.
*
* @return localization resource bundle name
*/
public String getResourceBundleName() {
return resourceBundleName;
}
/**
* Return the non-localized string name of the Level.
*
* @return non-localized name
*/
public String getName() {
return name;
}
/**
* Return the localized string name of the Level, for
* the current default locale.
* <p>
* If no localization information is available, the
* non-localized name is returned.
*
* @return localized name
*/
public String getLocalizedName() {
try {
ResourceBundle rb = ResourceBundle.getBundle(resourceBundleName);
return rb.getString(name);
} catch (Exception ex) {
return name;
}
}
/**
* @return the non-localized name of the Level, for example "INFO".
*/
public final String toString() {
return name;
}
/**
* Get the integer value for this level. This integer value
* can be used for efficient ordering comparisons between
* Level objects.
* @return the integer value for this level.
*/
public final int intValue() {
return value;
}
private static final long serialVersionUID = -8176160795706313070L;
// Serialization magic to prevent "doppelgangers".
// This is a performance optimization.
private Object readResolve() {
synchronized (Level.class) {
for (int i = 0; i < known.size(); i++) {
Level other = (Level) known.get(i);
if (this.name.equals(other.name) && this.value == other.value
&& (this.resourceBundleName == other.resourceBundleName ||
(this.resourceBundleName != null &&
this.resourceBundleName.equals(other.resourceBundleName)))) {
return other;
}
}
// Woops. Whoever sent us this object knows
// about a new log level. Add it to our list.
known.add(this);
return this;
}
}
/**
* Parse a level name string into a Level.
* <p>
* The argument string may consist of either a level name
* or an integer value.
* <p>
* For example:
* <ul>
* <li> "SEVERE"
* <li> "1000"
* </ul>
* @param name string to be parsed
* @throws NullPointerException if the name is null
* @throws IllegalArgumentException if the value is not valid.
* Valid values are integers between <CODE>Integer.MIN_VALUE</CODE>
* and <CODE>Integer.MAX_VALUE</CODE>, and all known level names.
* Known names are the levels defined by this class (i.e. <CODE>FINE</CODE>,
* <CODE>FINER</CODE>, <CODE>FINEST</CODE>), or created by this class with
* appropriate package access, or new levels defined or created
* by subclasses.
*
* @return The parsed value. Passing an integer that corresponds to a known name
* (eg 700) will return the associated name (eg <CODE>CONFIG</CODE>).
* Passing an integer that does not (eg 1) will return a new level name
* initialized to that value.
*/
public static synchronized Level parse(String name) throws IllegalArgumentException {
// Check that name is not null.
name.length();
// Look for a known Level with the given non-localized name.
for (int i = 0; i < known.size(); i++) {
Level l = (Level) known.get(i);
if (name.equals(l.name)) {
return l;
}
}
// Now, check if the given name is an integer. If so,
// first look for a Level with the given value and then
// if necessary create one.
try {
int x = Integer.parseInt(name);
for (int i = 0; i < known.size(); i++) {
Level l = (Level) known.get(i);
if (l.value == x) {
return l;
}
}
// Create a new Level.
return new Level(name, x);
} catch (NumberFormatException ex) {
// Not an integer.
// Drop through.
}
// Finally, look for a known level with the given localized name,
// in the current default locale.
// This is relatively expensive, but not excessively so.
for (int i = 0; i < known.size(); i++) {
Level l = (Level) known.get(i);
if (name.equals(l.getLocalizedName())) {
return l;
}
}
// OK, we've tried everything and failed
throw new IllegalArgumentException("Bad level \"" + name + "\"");
}
/**
* Compare two objects for value equality.
* @return true if and only if the two objects have the same level value.
*/
public boolean equals(Object ox) {
try {
Level lx = (Level)ox;
return (lx.value == this.value);
} catch (Exception ex) {
return false;
}
}
/**
* Generate a hashcode.
* @return a hashcode based on the level value
*/
public int hashCode() {
return this.value;
}
}
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