| /* |
| * Copyright 2003-2007 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.classgen; |
| |
| import java.lang.reflect.Method; |
| |
| import org.objectweb.asm.MethodVisitor; |
| import org.objectweb.asm.Opcodes; |
| import org.objectweb.asm.Type; |
| |
| /** |
| * A helper class to invoke methods more easily in ASM |
| * |
| * @author <a href="mailto:james@coredevelopers.net">James Strachan</a> |
| * @version $Revision$ |
| */ |
| public class MethodCaller implements Opcodes { |
| |
| private int opcode; |
| private String internalName; |
| private String name; |
| private Class theClass; |
| private String methodDescriptor; |
| |
| public static MethodCaller newStatic(Class theClass, String name) { |
| return new MethodCaller(INVOKESTATIC, theClass, name); |
| } |
| |
| public static MethodCaller newInterface(Class theClass, String name) { |
| return new MethodCaller(INVOKEINTERFACE, theClass, name); |
| } |
| |
| public static MethodCaller newVirtual(Class theClass, String name) { |
| return new MethodCaller(INVOKEVIRTUAL, theClass, name); |
| } |
| |
| public MethodCaller(int opcode, Class theClass, String name) { |
| this.opcode = opcode; |
| this.internalName = Type.getInternalName(theClass); |
| this.theClass = theClass; |
| this.name = name; |
| |
| } |
| |
| public void call(MethodVisitor methodVisitor) { |
| methodVisitor.visitMethodInsn(opcode, internalName, name, getMethodDescriptor()); |
| } |
| |
| public String getMethodDescriptor() { |
| if (methodDescriptor == null) { |
| Method method = getMethod(); |
| methodDescriptor = Type.getMethodDescriptor(method); |
| } |
| return methodDescriptor; |
| } |
| |
| protected Method getMethod() { |
| Method[] methods = theClass.getMethods(); |
| for (int i = 0; i < methods.length; i++) { |
| Method method = methods[i]; |
| if (method.getName().equals(name)) { |
| return method; |
| } |
| } |
| throw new ClassGeneratorException("Could not find method: " + name + " on class: " + theClass); |
| } |
| } |