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There is a newer version: 6.0.0.Beta4

/*
 * JBoss, Home of Professional Open Source
 * Copyright 2008, Red Hat, Inc. and/or its affiliates, and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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.jboss.weld.bean.proxy;

import javassist.bytecode.Bytecode;
import javassist.bytecode.ClassFile;
import javassist.bytecode.Opcode;
import org.jboss.weld.util.bytecode.BytecodeUtils;

/**
 * A {@link BytecodeMethodResolver} that looks up the method using the
 * reflection API.
 * 
 * TODO: cache the result somehow
 *
 * @author Stuart Douglas
 */
public class DefaultBytecodeMethodResolver implements BytecodeMethodResolver {

    public void getDeclaredMethod(ClassFile file, Bytecode code, String declaringClass, String methodName, String[] parameterTypes) {
        BytecodeUtils.pushClassType(code, declaringClass);
        // now we have the class on the stack
        code.addLdc(methodName);
        // now we need to load the parameter types into an array
        code.addIconst(parameterTypes.length);
        code.addAnewarray("java.lang.Class");
        for (int i = 0; i < parameterTypes.length; ++i) {
            code.add(Opcode.DUP); // duplicate the array reference
            code.addIconst(i);
            // now load the class object
            String type = parameterTypes[i];
            BytecodeUtils.pushClassType(code, type);
            // and store it in the array
            code.add(Opcode.AASTORE);
        }
        code.addInvokevirtual("java.lang.Class", "getDeclaredMethod", "(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;");
    }

}