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.MethodAdvice;
018import org.apache.tapestry5.plastic.MethodDescription;
019
020import java.lang.reflect.Method;
021
022/**
023 * Bundles together the fixed (same for all instances) information needed by a {@link MethodInvocationBundle}.
024 */
025public class MethodInvocationBundle
026{
027    public final String className;
028
029    public final MethodDescription methodDescription;
030
031    public final MethodAdvice[] advice;
032
033    private volatile Method method;
034
035    public MethodInvocationBundle(String className, MethodDescription methodDescription, MethodAdvice[] advice)
036    {
037        this.className = className;
038        this.methodDescription = methodDescription;
039        this.advice = advice;
040    }
041
042    public Method getMethod(Object instance)
043    {
044        if (method == null)
045            method = findMethod(instance.getClass().getClassLoader());
046
047        return method;
048    }
049
050    @SuppressWarnings("unchecked")
051    private Method findMethod(ClassLoader loader)
052    {
053        try
054        {
055            Class[] types = new Class[methodDescription.argumentTypes.length];
056
057            for (int i = 0; i < types.length; i++)
058            {
059                types[i] = PlasticInternalUtils.toClass(loader, methodDescription.argumentTypes[i]);
060            }
061
062            Class clazz = PlasticInternalUtils.toClass(loader, className);
063
064            return clazz.getDeclaredMethod(methodDescription.methodName, types);
065        } catch (Exception ex)
066        {
067            throw new RuntimeException(String.format("Unable to locate Method %s: %s", methodDescription,
068                    PlasticInternalUtils.toMessage(ex)), ex);
069        }
070    }
071
072}