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    }