A custom logger : Log « Ant « Java
A custom logger
/*
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.mwrm.ant.loggers;
import java.io.PrintStream;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.BuildLogger;
import org.apache.tools.ant.BuildEvent;
/**
* <p>A class that demonstrates some of the functionality
* of a custom logger.</p>
*/
public class BuildEventLogger implements BuildLogger {
/**
* PrintStream to write non-error messages to.
*/
private PrintStream out;
/**
* PrintStream to write error messages to.
*/
private PrintStream err;
/**
* Sets whether to tailor output for Emacs, etc.
* The default is <code>false</code>.
*/
private boolean emacsMode = false;
/**
* We'll set this logger to log only warnings.
*/
private int msgOutputLevel = Project.MSG_WARN;
/**
* <p>Signals that a build has started. This event
* is fired before any targets have started.</p>
*
* @param start An event with any relevant extra information.
* Must not be <code>null</code>.
*/
public final void buildStarted(final BuildEvent start) {
start.getProject().log("Message from buildStarted().", Project.MSG_ERR);
}
/**
* <p>Signals that the last target has finished. This event
* will still be fired if an error occurred during the build.</p>
*
* @param finish An event with any relevant extra information.
* Must not be <code>null</code>.
*
* @see BuildEvent#getException()
*/
public void buildFinished(final BuildEvent finish) {
// empty
}
/**
* <p>Signals that a target is starting.</p>
*
* @param start An event with any relevant extra information.
* Must not be <code>null</code>.
*
* @see BuildEvent#getTarget()
*/
public void targetStarted(final BuildEvent start) {
// empty
}
/**
* <p>Signals that a target has finished. This event will
* still be fired if an error occurred during the build.</p>
*
* @param finish An event with any relevant extra information.
* Must not be <code>null</code>.
*
* @see BuildEvent#getException()
*/
public void targetFinished(final BuildEvent finish) {
// empty
}
/**
* <p>Signals that a task is starting.</p>
*
* @param start An event with any relevant extra information.
* Must not be <code>null</code>.
*
* @see BuildEvent#getTask()
*/
public void taskStarted(final BuildEvent start) {
// empty
}
/**
* <p>Signals that a task has finished. This event will still
* be fired if an error occurred during the build.</p>
*
* @param finish An event with any relevant extra information.
* Must not be <code>null</code>.
*
* @see BuildEvent#getException()
*/
public void taskFinished(final BuildEvent finish) {
// empty
}
/** <p>When a message is sent to this logger, Ant calls this method.</p>
* @param event An event with any relevant extra information.
* Must not be <code>null</code>.
*
* @see BuildEvent#getMessage()
* @see BuildEvent#getPriority()
*/
public final void messageLogged(final BuildEvent event) {
/// We need to determine how important this message is
int priority = event.getPriority();
// If it's as important as our log level, we display it
if (priority <= msgOutputLevel) {
out.println("messageLogged: " + event.getMessage());
}
}
/**
* <p>Sets the output stream to which this logger is to send its output.</p>
*
* @param output The output stream for the logger.
* Must not be <code>null</code>.
*/
public final void setOutputPrintStream(final PrintStream output) {
this.out = new PrintStream(output, true);
}
/**
* <p>Sets the output stream to which this logger
* is to send error messages.</p>
*
* @param errorStream The error stream for the logger.
* Must not be <code>null</code>.
*/
public final void setErrorPrintStream(final PrintStream errorStream) {
this.err = new PrintStream(errorStream, true);
}
/**
* <p>Sets this logger to produce Emacs
* (and other editor) friendly output.</p>
*
* @param mode <code>true</code> if output is to be unadorned so that
* Emacs and other editors can parse files names, etc.
*/
public final void setEmacsMode(final boolean mode) {
this.emacsMode = mode;
}
/**
* <p>Sets the highest level of message this logger should respond to.</p>
*
* <p>Only messages with a message level lower than or equal to the
* given level should be written to the log.</p>
* <p>
* Constants for the message levels are in the
* {@link Project Project} class. The order of the levels, from least
* to most verbose, is <code>MSG_ERR</code>, <code>MSG_WARN</code>,
* <code>MSG_INFO</code>, <code>MSG_VERBOSE</code>,
* <code>MSG_DEBUG</code>.</p>
* <p>The default for this logger is
* {@link Project#MSG_WARN Project.MSG_WARN}.</p>
*
* @param level the logging level for the logger.
*/
public void setMessageOutputLevel(final int level) {
// We will leave this empty to use the default level,
// which we set above
}
}
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