org.apache.commons.javaflow.bytecode.BytecodeClassLoader Maven / Gradle / Ivy

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.commons.javaflow.bytecode;

import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.Opcodes;

public class BytecodeClassLoader extends ClassLoader {

    class NameClassAdapter extends ClassVisitor {
        private String className;

        public NameClassAdapter() {
            super(Opcodes.ASM4);
        }
        
        public void visit( int version, int access, String name, String signature, String superName, String[] interfaces ) {
            className = name;
        }
        
        public String getName() {
            return className;
        }
    }
    
    public Class loadClass( final byte[] bytecode ) {
        final NameClassAdapter nameClassAdapter = new NameClassAdapter();
        
        new ClassReader(bytecode).accept(nameClassAdapter, 0);
        
        final String name = nameClassAdapter.getName().replace('/', '.');
        
        // System.out.println("loading class " + name);
        
        final Class clazz = defineClass(name, bytecode, 0, bytecode.length);
        
        return clazz;
    }
}