org.eclipse.b3.build.internal.BuildUtilsDynamicClassLoader.java Source code

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Here is the source code for org.eclipse.b3.build.internal.BuildUtilsDynamicClassLoader.java

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/**
 * Copyright (c) 2010, Cloudsmith Inc and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * Contributors:
 * - Cloudsmith Inc - initial API and implementation.
 */
package org.eclipse.b3.build.internal;

import org.eclipse.b3.backend.core.runtime.ClassloaderSupport;
import org.eclipse.b3.build.BuildUnit;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.Opcodes;

class BuildUtilsDynamicClassLoader extends ClassLoader implements Opcodes {
    public BuildUtilsDynamicClassLoader(ClassLoader parent) {
        super(parent);
    }

    public Class<?> defineClass(String name, byte[] b) {
        return defineClass(name, b, 0, b.length);
    }

    @SuppressWarnings("unchecked")
    @Override
    public synchronized Class<?> findClass(String name) throws ClassNotFoundException {
        if (name.startsWith(BuildUnitUtils.BUILDUNIT_INTERFACE_PREFIX)) {
            ClassWriter cw = new ClassWriter(0);
            cw.visit(V1_5, ACC_PUBLIC + ACC_ABSTRACT + ACC_INTERFACE, // access
                    dottedToInternal(name), // interface name in internal form
                    null, // generics
                    "java/lang/Object", // superclass
                    new String[] { // extended interfaces
                            "org/eclipse/b3/build/BuildUnit" });
            cw.visitEnd();
            byte bytes[] = cw.toByteArray();
            Class<? extends BuildUnit> clazz = (Class<? extends BuildUnit>) (defineClass(name, bytes, 0,
                    bytes.length));
            return clazz;
        }
        try {
            // load class using the backend bundle (since b3 buddies are registered against this bundle).
            return ClassloaderSupport.load(name);
        } catch (ClassNotFoundException e) {
            // do nothing, try the super class loader
        }
        return super.findClass(name);
    }

    private String dottedToInternal(String str) {
        return str.replaceAll("\\.", "/");
    }
}