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/*
 * Copyright (c) 1998-2007, Peter T Mount

 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 
 *   Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 *   Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 *   Neither the name of the retep.org.uk nor the names of its contributors
 *   may be used to endorse or promote products derived from this software
 *   without specific prior written permission.
 *
 * 
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package uk.org.retep.util.classloader;

import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Base class for our class loaders. This maintains a cache of the loaded classes
 * @author peter
 */
public abstract class CachingClassLoader
        extends ClassLoader
{

    private final Map> cache = new ConcurrentHashMap>();

    public CachingClassLoader()
    {
        super();
    }

    public CachingClassLoader( final ClassLoader parent )
    {
        super( parent );
    }

    public final Set getClassNames()
    {
        return cache.keySet();
    }

    public final void clearCache()
    {
        cache.clear();
    }

    protected final Class getClass( final String className )
    {
        return cache.get( className );
    }

    protected final void putClass( final String className, final Class c )
    {
        cache.put( className, c );
    }

    @Override
    protected abstract Class loadClass( String className,
                                           boolean Resolve )
            throws ClassNotFoundException;

    @Override
    protected abstract URL findResource( String arg0 );

    @Override
    protected abstract Enumeration findResources( String arg0 )
            throws IOException;
}