Groovy example source code file (GroovySunClassLoader.java)

This example Groovy source code file (GroovySunClassLoader.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Groovy tags/keywords

classreader, classreader, classwriter, groovysunclassloader, groovysunclassloader, inputstream, io, ioexception, privilegedaction, security, string, string, sunclassloader, sunclassloader, throwable

The Groovy GroovySunClassLoader.java source code

/*
 * Copyright 2003-2009 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.codehaus.groovy.runtime.callsite;

import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassWriter;
import org.codehaus.groovy.reflection.SunClassLoader;

import java.io.IOException;
import java.io.InputStream;
import java.security.AccessController;
import java.security.PrivilegedAction;

public class GroovySunClassLoader extends SunClassLoader {

    public static final SunClassLoader sunVM;

    static {
            sunVM = AccessController.doPrivileged(new PrivilegedAction<SunClassLoader>() {
                public SunClassLoader run() {
                    try {
                        if (SunClassLoader.sunVM != null) {
                            return new GroovySunClassLoader();
                        }
                    }
                    catch (Throwable t) {//
                    }
                    return null;
                }
            });
    }

    protected GroovySunClassLoader () throws Throwable {
        super();
        loadAbstract ();
        loadFromRes("org.codehaus.groovy.runtime.callsite.MetaClassSite");
        loadFromRes("org.codehaus.groovy.runtime.callsite.MetaMethodSite");
        loadFromRes("org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite");
        loadFromRes("org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite");
        loadFromRes("org.codehaus.groovy.runtime.callsite.StaticMetaMethodSite");
    }

    private void loadAbstract() throws IOException {
        final InputStream asStream = GroovySunClassLoader.class.getClass().getClassLoader().getResourceAsStream(resName("org.codehaus.groovy.runtime.callsite.AbstractCallSite"));
        ClassReader reader = new ClassReader(asStream);
        final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS) {
            public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
                super.visit(version, access, name, signature, "sun/reflect/GroovyMagic", interfaces);
            }
        };
        reader.accept(cw, ClassWriter.COMPUTE_MAXS);
        asStream.close();
        define(cw.toByteArray(), "org.codehaus.groovy.runtime.callsite.AbstractCallSite");
    }

}