org.apache.bsf.util.event.generator.AdapterClassLoader.java Source code

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Here is the source code for org.apache.bsf.util.event.generator.AdapterClassLoader.java

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/*
 * Copyright 2004,2004 The Apache Software Foundation.
 * 
 * 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.apache.bsf.util.event.generator;

import java.util.Hashtable;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class AdapterClassLoader extends ClassLoader {
    private static Hashtable classCache = new Hashtable();
    private Class c;

    private Log logger = LogFactory.getLog(this.getClass().getName());

    public AdapterClassLoader() {
        super();
    }

    public synchronized Class defineClass(String name, byte[] b) {
        if ((c = getLoadedClass(name)) == null) {
            c = defineClass(name.replace('/', '.'), b, 0, b.length); // rgf, 2006-02-03
            put(name, c);
        } else {
            logger.error("AdapterClassLoader: " + c + " previously loaded. Can not redefine class.");
        }

        return c;
    }

    final protected Class findClass(String name) {
        return get(name);
    }

    final protected Class get(String name) {
        return (Class) classCache.get(name);
    }

    public synchronized Class getLoadedClass(String name) {
        Class c = findLoadedClass(name);

        if (c == null) {
            try {
                c = findSystemClass(name);
            } catch (ClassNotFoundException e) {
            }
        }

        if (c == null) {
            c = findClass(name);
        }

        return c;
    }

    protected synchronized Class loadClass(String name, boolean resolve) throws ClassNotFoundException {
        Class c = getLoadedClass(name);

        if (c != null && resolve) {
            resolveClass(c);
        }

        return c;
    }
    // Not in JDK 1.1, only in JDK 1.2.
    //  public AdapterClassLoader(ClassLoader loader)
    //  {
    //    super(loader);
    //  }

    final protected void put(String name, Class c) {
        classCache.put(name, c);
    }
}