| /* |
| * Copyright 2003-2007 the original author or authors. |
| * |
| * 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 groovy.lang; |
| |
| import java.io.IOException; |
| import java.io.PrintWriter; |
| import java.io.Writer; |
| |
| public class TracingInterceptor implements Interceptor { |
| |
| protected Writer writer = new PrintWriter(System.out); |
| private int indent = 0; |
| |
| public Writer getWriter() { |
| return writer; |
| } |
| |
| public void setWriter(Writer writer) { |
| this.writer = writer; |
| } |
| |
| public Object beforeInvoke(Object object, String methodName, Object[] arguments) { |
| write(object, methodName, arguments, "before"); |
| indent++ ; |
| return null; |
| } |
| |
| public Object afterInvoke(Object object, String methodName, Object[] arguments, Object result) { |
| indent--; |
| write(object, methodName, arguments, "after "); |
| return result; |
| } |
| |
| public boolean doInvoke() { |
| return true; |
| } |
| private String indent(){ |
| StringBuffer result = new StringBuffer(); |
| for (int i=0; i<indent;i++){ |
| result.append(" "); |
| } |
| return result.toString(); |
| } |
| |
| protected void write(Object object, String methodName, Object[] arguments, final String origin) { |
| try { |
| writer.write(indent()); |
| writer.write(origin); |
| writer.write(" "); |
| Class theClass = object instanceof Class ? (Class) object: object.getClass(); |
| writeInfo(theClass, methodName, arguments); |
| writer.write("\n"); |
| writer.flush(); |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } |
| } |
| |
| protected void writeInfo(final Class aClass, String methodName, Object[] arguments) throws IOException { |
| writer.write(aClass.getName()); |
| writer.write("."); |
| writer.write(methodName); |
| writer.write("("); |
| for (int i = 0; i < arguments.length; i++) { |
| if (i > 0) writer.write(", "); |
| Object argument = arguments[i]; |
| writer.write(argument.getClass().getName()); |
| } |
| writer.write(")"); |
| } |
| } |