    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
    015    package org.apache.tapestry5.internal.plastic;
    016
    017    import org.apache.tapestry5.plastic.MethodAdvice;
    018    import org.apache.tapestry5.plastic.MethodDescription;
    019
    020    import java.lang.reflect.Method;
    021
    022    /**
    023     * Bundles together the fixed (same for all instances) information needed by a {@link MethodInvocationBundle}.
    024     */
    025    public 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    }