    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}