001// Copyright 2011 The Apache Software Foundation 002// 003// Licensed under the Apache License, Version 2.0 (the "License"); 004// you may not use this file except in compliance with the License. 005// You may obtain a copy of the License at 006// 007// http://www.apache.org/licenses/LICENSE-2.0 008// 009// Unless required by applicable law or agreed to in writing, software 010// distributed under the License is distributed on an "AS IS" BASIS, 011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012// See the License for the specific language governing permissions and 013// limitations under the License. 014 015package org.apache.tapestry5.internal.plastic; 016 017import org.apache.tapestry5.plastic.MethodHandle; 018import org.apache.tapestry5.plastic.MethodInvocationResult; 019 020public class MethodHandleImpl implements MethodHandle 021{ 022 private final String className, methodDescription; 023 024 private final int methodIndex; 025 026 protected volatile PlasticClassHandleShim shim; 027 028 public MethodHandleImpl(String className, String methodDescription, int methodIndex) 029 { 030 this.className = className; 031 this.methodDescription = methodDescription; 032 this.methodIndex = methodIndex; 033 } 034 035 public String toString() 036 { 037 return String.format("MethodHandle[%s %s]", className, methodDescription); 038 } 039 040 public MethodInvocationResult invoke(Object instance, Object... arguments) 041 { 042 043 if (instance == null) 044 throw new NullPointerException(String.format( 045 "Unable to invoke method %s of class %s, as provided instance is null.", methodDescription, 046 className)); 047 048 return shim.invoke(instance, methodIndex, arguments); 049 } 050 051}