src/main/org/apache/tools/ant/BuildListener.java

/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000,2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *
 * 2. Redistributions in binary form must reproduce the above copyright
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 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
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 * 4. The names "The Jakarta Project", "Ant", and "Apache Software
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 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.apache.tools.ant;

import java.util.EventListener;

/**
 * Instances of classes that implement this interface can register 
 * to be notified when things happened during a build.
 *
 * @see BuildEvent
 * @see Project#addBuildListener(BuildListener)
 *
 * @author Matt Foemmel
 */
public interface BuildListener extends EventListener {

    /**
     * Signals that a build has started. This event
     * is fired before any targets have started.
     * 
     * @param event An event with any relevant extra information.
     *              Must not be <code>null</code>.
     */
    void buildStarted(BuildEvent event);

    /**
     * Signals that the last target has finished. This event
     * will still be fired if an error occurred during the build.
     * 
     * @param event An event with any relevant extra information.
     *              Must not be <code>null</code>.
     *
     * @see BuildEvent#getException()
     */
    void buildFinished(BuildEvent event);

    /**
     * Signals that a target is starting.
     * 
     * @param event An event with any relevant extra information.
     *              Must not be <code>null</code>.
     *
     * @see BuildEvent#getTarget()
     */
    void targetStarted(BuildEvent event);

    /**
     * Signals that a target has finished. This event will
     * still be fired if an error occurred during the build.
     * 
     * @param event An event with any relevant extra information.
     *              Must not be <code>null</code>.
     *
     * @see BuildEvent#getException()
     */
    void targetFinished(BuildEvent event);

    /**
     * Signals that a task is starting.
     * 
     * @param event An event with any relevant extra information.
     *              Must not be <code>null</code>.
     *
     * @see BuildEvent#getTask()
     */
    void taskStarted(BuildEvent event);

    /**
     * Signals that a task has finished. This event will still
     * be fired if an error occurred during the build.
     *
     * @param event An event with any relevant extra information.
     *              Must not be <code>null</code>.
     *
     * @see BuildEvent#getException()
     */
    void taskFinished(BuildEvent event);

    /**
     * Signals a message logging event.
     * 
     * @param event An event with any relevant extra information.
     *              Must not be <code>null</code>.
     *
     * @see BuildEvent#getMessage()
     * @see BuildEvent#getPriority()
     */
    void messageLogged(BuildEvent event);
}