001// Copyright 2004, 2005 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 015package org.apache.tapestry.pageload; 016 017import java.util.Collection; 018import java.util.Iterator; 019 020import org.apache.tapestry.IComponent; 021import org.apache.tapestry.Tapestry; 022 023/** 024 * Walks through the tree of components and invokes the visitors on each of 025 * of the components in the tree. 026 * 027 * @author mindbridge 028 * @since 3.0 029 */ 030public class ComponentTreeWalker 031{ 032 private IComponentVisitor[] _visitors; 033 034 public ComponentTreeWalker(IComponentVisitor[] visitors) 035 { 036 _visitors = visitors; 037 } 038 039 public void walkComponentTree(IComponent component) 040 { 041 // Invoke visitors 042 for (int i = 0; i < _visitors.length; i++) 043 { 044 IComponentVisitor visitor = _visitors[i]; 045 visitor.visitComponent(component); 046 } 047 048 // Recurse into the embedded components 049 Collection components = component.getComponents().values(); 050 051 if (Tapestry.size(components) == 0) 052 return; 053 054 for (Iterator it = components.iterator(); it.hasNext();) 055 { 056 IComponent embedded = (IComponent) it.next(); 057 walkComponentTree(embedded); 058 } 059 } 060}