/*

  * Copyright 2004-2011 the Seasar Foundation and the Others.

  *

  * 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.seasar.teeda.core.interceptor;

 import java.io.PrintWriter;

 import java.util.Iterator;

 import javax.faces.component.UIComponent;

 import javax.faces.component.UIViewRoot;

 import javax.faces.component.html.HtmlCommandLink;

 import javax.faces.component.html.HtmlOutputText;

 import javax.faces.context.FacesContext;

 import org.aopalliance.intercept.MethodInvocation;

 import org.seasar.framework.aop.interceptors.AbstractInterceptor;

 import org.seasar.framework.log.Logger;

 import org.seasar.framework.util.SPrintWriter;

 /**

  * @author manhole

  */

 public class DumpComponentTreeInterceptor extends AbstractInterceptor {

     private static final Logger logger_ = Logger

             .getLogger(DumpComponentTreeInterceptor.class);

     private static final long serialVersionUID = 1L;

     public Object invoke(MethodInvocation invocation) throws Throwable {

         FacesContext context = FacesContext.getCurrentInstance();

         printBefore(context);

         try {

             return invocation.proceed();

         } finally {

             printAfter(context);

         }

     }

     private void printAfter(FacesContext context) {

         SPrintWriter writer = new SPrintWriter();

         writer.println(getClass().getName() + " after");

         dumpTree(writer, context);

         logger_.debug(writer.toString());

     }

     private void printBefore(FacesContext context) {

         SPrintWriter writer = new SPrintWriter();

         writer.println(getClass().getName() + " before");

         dumpTree(writer, context);

         logger_.debug(writer.toString());

     }

     protected void dumpTree(PrintWriter writer, FacesContext context) {

         UIViewRoot viewRoot = context.getViewRoot();

         writer

                 .println("[tree] " + viewRoot + " viewId="

                         + viewRoot.getViewId());

         dumpTree(writer, viewRoot, 1);

     }

     protected void dumpTree(PrintWriter writer, UIComponent component, int depth) {

         for (Iterator it = component.getFacetsAndChildren(); it.hasNext();) {

             UIComponent child = (UIComponent) it.next();

             writer.print("[tree] ");

             for (int i = 0; i < depth; i++) {

                 writer.print("  ");

             }

             printComponent(writer, child);

             writer.println();

             dumpTree(writer, child, depth + 1);

         }

     }

     protected void printComponent(PrintWriter writer, UIComponent child) {

         if (child instanceof HtmlCommandLink) {

             HtmlCommandLink commandLink = (HtmlCommandLink) child;

             writer.print(commandLink);

             writer.print(" " + commandLink.getValue());

         } else if (child instanceof HtmlOutputText) {

             HtmlOutputText outputText = (HtmlOutputText) child;

             writer.print(outputText);

             writer.print(" " + outputText.getValue());

         } else {

             writer.print(child);

         }

     }

 }