/*
* 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.asm;
import java.lang.reflect.Method;
import org.codehaus.groovy.classgen.ClassGeneratorException;
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: 20965 $
*/
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);
}
}