ResourceFinderIClassLoader.java :  » Scripting » janino-2.5.11 » org » codehaus » janino » Java Open Source

/*
 * Janino - An embedded Java[TM] compiler
 *
 * Copyright (c) 2001-2007, Arno Unkrig
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *    1. Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *    2. 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.
 *    3. The name of the author may not be used to endorse or promote
 *       products derived from this software without specific prior
 *       written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 org.codehaus.janino;

import java.io.*;

import org.codehaus.janino.util.ClassFile;
import org.codehaus.janino.util.resource.*;


/**
 * This {@link org.codehaus.janino.IClassLoader} loads IClasses through a
 * a {@link org.codehaus.janino.util.resource.ResourceFinder} that designates
 * {@link org.codehaus.janino.util.ClassFile}s.
 */
public class ResourceFinderIClassLoader extends IClassLoader {
    private final ResourceFinder resourceFinder;

    public ResourceFinderIClassLoader(
        ResourceFinder resourceFinder,
        IClassLoader   optionalParentIClassLoader
    ) {
        super(optionalParentIClassLoader);
        this.resourceFinder = resourceFinder;
        this.postConstruct();
    }

    protected IClass findIClass(String descriptor) throws ClassNotFoundException {
        String className = Descriptor.toClassName(descriptor);

        // Find the class file resource.
        Resource classFileResource = this.resourceFinder.findResource(ClassFile.getClassFileResourceName(className));
        if (classFileResource == null) return null;

        // Open the class file resource.
        InputStream is;
        try {
            is = classFileResource.open();
        } catch (IOException ex) {
            throw new ClassNotFoundException("Opening resource \"" + classFileResource.getFileName() + "\"", ex);
        }

        // Load the IClass from the class file.
        ClassFile cf;
        try {
            cf = new ClassFile(is);
        } catch (IOException e) {
            throw new ClassNotFoundException("Reading resource \"" + classFileResource.getFileName() + "\"", e);
        } finally {
            try { is.close(); } catch (IOException e) {}
        }
        IClass iClass = new ClassFileIClass(cf, this);
        this.defineIClass(iClass);
        return iClass;
    }

}