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ConsoleHandler.java
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129 lines (122 loc) · 3.81 KB
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/*
* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.util.logging;
/**
* This <tt>Handler</tt> publishes log records to <tt>System.err</tt>.
* By default the <tt>SimpleFormatter</tt> is used to generate brief summaries.
* <p>
* <b>Configuration:</b>
* By default each <tt>ConsoleHandler</tt> is initialized using the following
* <tt>LogManager</tt> configuration properties where {@code <handler-name>}
* refers to the fully-qualified class name of the handler.
* If properties are not defined
* (or have invalid values) then the specified default values are used.
* <ul>
* <li> <handler-name>.level
* specifies the default level for the <tt>Handler</tt>
* (defaults to <tt>Level.INFO</tt>). </li>
* <li> <handler-name>.filter
* specifies the name of a <tt>Filter</tt> class to use
* (defaults to no <tt>Filter</tt>). </li>
* <li> <handler-name>.formatter
* specifies the name of a <tt>Formatter</tt> class to use
* (defaults to <tt>java.util.logging.SimpleFormatter</tt>). </li>
* <li> <handler-name>.encoding
* the name of the character set encoding to use (defaults to
* the default platform encoding). </li>
* </ul>
* <p>
* For example, the properties for {@code ConsoleHandler} would be:
* <ul>
* <li> java.util.logging.ConsoleHandler.level=INFO </li>
* <li> java.util.logging.ConsoleHandler.formatter=java.util.logging.SimpleFormatter </li>
* </ul>
* <p>
* For a custom handler, e.g. com.foo.MyHandler, the properties would be:
* <ul>
* <li> com.foo.MyHandler.level=INFO </li>
* <li> com.foo.MyHandler.formatter=java.util.logging.SimpleFormatter </li>
* </ul>
* <p>
* @since 1.4
*/
public class ConsoleHandler extends StreamHandler {
// Private method to configure a ConsoleHandler from LogManager
// properties and/or default values as specified in the class
// javadoc.
private void configure() {
LogManager manager = LogManager.getLogManager();
String cname = getClass().getName();
setLevel(manager.getLevelProperty(cname +".level", Level.INFO));
setFilter(manager.getFilterProperty(cname +".filter", null));
setFormatter(manager.getFormatterProperty(cname +".formatter", new SimpleFormatter()));
try {
setEncoding(manager.getStringProperty(cname +".encoding", null));
} catch (Exception ex) {
try {
setEncoding(null);
} catch (Exception ex2) {
// doing a setEncoding with null should always work.
// assert false;
}
}
}
/**
* Create a <tt>ConsoleHandler</tt> for <tt>System.err</tt>.
* <p>
* The <tt>ConsoleHandler</tt> is configured based on
* <tt>LogManager</tt> properties (or their default values).
*
*/
public ConsoleHandler() {
sealed = false;
configure();
setOutputStream(System.err);
sealed = true;
}
/**
* Publish a <tt>LogRecord</tt>.
* <p>
* The logging request was made initially to a <tt>Logger</tt> object,
* which initialized the <tt>LogRecord</tt> and forwarded it here.
* <p>
* @param record description of the log event. A null record is
* silently ignored and is not published
*/
@Override
public void publish(LogRecord record) {
super.publish(record);
flush();
}
/**
* Override <tt>StreamHandler.close</tt> to do a flush but not
* to close the output stream. That is, we do <b>not</b>
* close <tt>System.err</tt>.
*/
@Override
public void close() {
flush();
}
}