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 * Copyright 2004 The Apache Software Foundation
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 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
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package org.apache.catalina;


import java.beans.PropertyChangeListener;


/**
 * A Loader represents a Java ClassLoader implementation that can
 * be used by a Container to load class files (within a repository associated
 * with the Loader) that are designed to be reloaded upon request, as well as
 * a mechanism to detect whether changes have occurred in the underlying
 * repository.
 * 
 * In order for a Loader implementation to successfully operate
 * with a Context implementation that implements reloading, it
 * must obey the following constraints:
 * 

 * Must implement Lifecycle so that the Context can indicate
 *     that a new class loader is required.
 * 
The start() method must unconditionally create a new
 *     ClassLoader implementation.
 * 
The stop() method must throw away its reference to the
 *     ClassLoader previously utilized, so that the class loader,
 *     all classes loaded by it, and all objects of those classes, can be
 *     garbage collected.
 * 
Must allow a call to stop() to be followed by a call to
 *     start() on the same Loader instance.
 * 
Based on a policy chosen by the implementation, must call the
 *     Context.reload() method on the owning Context
 *     when a change to one or more of the class files loaded by this class
 *     loader is detected.
 * 
 *
 * @author Craig R. McClanahan
 * @version $Revision: 1.3 $ $Date: 2005/12/08 01:27:18 $
 */

public interface Loader {


    // ------------------------------------------------------------- Properties


    /**
     * Return the Java class loader to be used by this Container.
     */
    public ClassLoader getClassLoader();


    /**
     * Return the Container with which this Loader has been associated.
     */
    public Container getContainer();


    /**
     * Set the Container with which this Loader has been associated.
     *
     * @param container The associated Container
     */
    public void setContainer(Container container);

    
    /**
     * Return the "follow standard delegation model" flag used to configure
     * our ClassLoader.
     */
    public boolean getDelegate();


    /**
     * Set the "follow standard delegation model" flag used to configure
     * our ClassLoader.
     *
     * @param delegate The new flag
     */
    public void setDelegate(boolean delegate);


    /**
     * Return descriptive information about this Loader implementation and
     * the corresponding version number, in the format
     * <description>/<version>.
     */
    public String getInfo();


    /**
     * Return the reloadable flag for this Loader.
     */
    public boolean getReloadable();


    /**
     * Set the reloadable flag for this Loader.
     *
     * @param reloadable The new reloadable flag
     */
    public void setReloadable(boolean reloadable);


    // --------------------------------------------------------- Public Methods


    /**
     * Add a property change listener to this component.
     *
     * @param listener The listener to add
     */
    public void addPropertyChangeListener(PropertyChangeListener listener);


    /**
     * Add a new repository to the set of repositories for this class loader.
     *
     * @param repository Repository to be added
     */
    public void addRepository(String repository);


    /**
     * Return the set of repositories defined for this class loader.
     * If none are defined, a zero-length array is returned.
     */
    public String[] findRepositories();


    /**
     * Has the internal repository associated with this Loader been modified,
     * such that the loaded classes should be reloaded?
     */
    public boolean modified();


    /**
     * Remove a property change listener from this component.
     *
     * @param listener The listener to remove
     */
    public void removePropertyChangeListener(PropertyChangeListener listener);


    // START PE 4985680
    /**
     * Adds the given package name to the list of packages that may always be
     * overriden, regardless of whether they belong to a protected namespace
     */
    public void addOverridablePackage(String packageName);
    // END PE 4985680


    // START PWC 1.1 6314481
    public void setIgnoreHiddenJarFiles(boolean ignoreHiddenJarFiles);
    // END PWC 1.1 6314481
}