001/*
002 * (C) Copyright 2006-2008 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Alexandre Russel
018 *
019 * $Id$
020 */
021
022package org.nuxeo.ecm.platform.annotations.gwt.client.util;
023
024import com.google.gwt.dom.client.Document;
025import com.google.gwt.dom.client.Node;
026import com.google.gwt.dom.client.NodeList;
027
028/**
029 * @author Alexandre Russel
030 */
031public class Visitor {
032    private final NodeProcessor processor;
033
034    private boolean processing = true;
035
036    private boolean partialVisit = false;
037
038    private Node startNode;
039
040    private Node endNode;
041
042    public Visitor(NodeProcessor visitor) {
043        this.processor = visitor;
044    }
045
046    /**
047     * process all the children of this node.
048     *
049     * @param node
050     */
051    public void process(Node node) {
052        visit(node);
053    }
054
055    /**
056     * process all the node of this document.
057     *
058     * @param document
059     */
060    public void process(Document document) {
061        visit(document);
062    }
063
064    /**
065     * process all the node from startNode to endNode.
066     *
067     * @param startNode
068     * @param endNode
069     */
070    public void process(Node startNode, Node endNode) {
071        this.processing = false;
072        partialVisit = true;
073        this.startNode = startNode;
074        this.endNode = endNode;
075        visit(startNode.getOwnerDocument());
076    }
077
078    public void visit(Node node) {
079        if (startNode == node) {
080            processing = true;
081        } else if (endNode == node) {
082            processing = false;
083        }
084        if (processor.doBreak()) {
085            return;
086        }
087
088        NodeList list = node.getChildNodes();
089        if (list == null || list.getLength() == 0) {
090            processIf(node);
091        } else {
092            int length = list.getLength();
093            Node[] nodes = new Node[list.getLength()];
094            for (int x = 0; x < length; x++) {
095                nodes[x] = list.getItem(x);
096            }
097            processIf(node);
098            for (int x = 0; x < length; x++) {
099                visit(nodes[x]);
100            }
101        }
102
103    }
104
105    private void processIf(Node node) {
106        if (processing || !partialVisit) {
107            processor.process(node);
108        }
109    }
110
111}