| // Copyright 2008 The Apache Software Foundation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package org.apache.tapestry5.integration.app1.services; |
| |
| import org.apache.tapestry5.model.MutableComponentModel; |
| import org.apache.tapestry5.services.*; |
| |
| public class ReverseStringsWorker implements ComponentClassTransformWorker |
| { |
| private final ComponentMethodAdvice advice = new ComponentMethodAdvice() |
| { |
| public void advise(ComponentMethodInvocation invocation) |
| { |
| for (int i = 0; i < invocation.getParameterCount(); i++) |
| { |
| if (invocation.getParameterType(i).equals(String.class)) |
| { |
| String value = (String) invocation.getParameter(i); |
| |
| invocation.override(i, reverse(value)); |
| } |
| } |
| |
| invocation.proceed(); |
| |
| if (invocation.getResultType().equals(String.class)) |
| { |
| if (invocation.isFail()) |
| { |
| Exception thrown = invocation.getThrown(Exception.class); |
| |
| invocation.overrideResult( |
| String.format("Invocation of method %s() failed with %s.", |
| invocation.getMethodName(), |
| thrown.getClass().getName())); |
| |
| return; |
| } |
| |
| String value = (String) invocation.getResult(); |
| |
| invocation.overrideResult(reverse(value)); |
| } |
| } |
| |
| private String reverse(String input) |
| { |
| char[] inputArray = input.toCharArray(); |
| char[] outputArray = new char[inputArray.length]; |
| |
| for (int i = 0; i < inputArray.length; i++) |
| { |
| outputArray[inputArray.length - i - 1] = inputArray[i]; |
| } |
| |
| return new String(outputArray); |
| } |
| }; |
| |
| public void transform(ClassTransformation transformation, MutableComponentModel model) |
| { |
| for (TransformMethodSignature sig : transformation.findMethodsWithAnnotation(ReverseStrings.class)) |
| { |
| transformation.advise(sig, advice); |
| } |
| } |
| } |