org.impalaframework.classloader.CustomClassLoader.java Source code

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Here is the source code for org.impalaframework.classloader.CustomClassLoader.java

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/*
 * Copyright 2007-2010 the original author or authors.
 * 
 * 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.impalaframework.classloader;

import java.io.File;

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

/**
 * Subclass of <code>URLClassLoader</code> which will attempt to load from the supplied
 * class location AFTER attempting to load using the parent class location
 * @author Phil Zoio
 */
public class CustomClassLoader extends BaseURLClassLoader {

    private static final Log logger = LogFactory.getLog(CustomClassLoader.class);

    public CustomClassLoader(File[] locations) {
        super(locations);
    }

    public CustomClassLoader(ClassLoader parent, File[] locations) {
        super(parent, locations);
    }

    public Class<?> loadClass(String className) throws ClassNotFoundException {

        Class<?> toReturn = loadParentClass(className);

        if (toReturn == null) {
            toReturn = getAlreadyLoadedClass(className);
        }
        if (toReturn == null) {
            toReturn = loadCustomClass(className);
        }
        if (toReturn == null) {
            if (logger.isDebugEnabled())
                logger.debug("Class not found: " + className);
            throw new ClassNotFoundException(className);
        }
        return toReturn;
    }

}