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Java > Open Source Codes > com > caucho > xpath > pattern > SelectedAttribute


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.xpath.pattern;
30
31 import org.w3c.dom.Node JavaDoc;
32
33 /**
34  * Represents a selected node.
35  */
36 public class SelectedAttribute extends SelectedNode {
37   /**
38    * Creates new selected node, calculating the index.
39    *
40    * @param node the underlying DOM node.
41    */
42   public SelectedAttribute(Node JavaDoc node)
43   {
44     super(node);
45
46     _level = 0;
47     for (Node JavaDoc ptr = node; ptr != null; ptr = ptr.getPreviousSibling())
48       _level--;
49   }
50
51   /**
52    * Returns the node's index
53    */
54   public int compareTo(SelectedNode b)
55   {
56     Node JavaDoc aPtr = getNode();
57     Node JavaDoc bPtr = b.getNode();
58
59     int aDepth = _depth;
60     int bDepth = b._depth;
61
62     if (aPtr == bPtr)
63       return 0;
64     
65     if (b instanceof SelectedAttribute) {
66       if (aPtr.getParentNode() == bPtr.getParentNode()) {
67         // Using getNextSibling() because QAttr doesn't
68 // implement getPreviousSibling
69 for (; bPtr != null; bPtr = bPtr.getNextSibling()) {
70           if (aPtr == bPtr)
71             return 1;
72         }
73
74         return -1;
75       }
76       else
77         return compareTo(aPtr.getParentNode(), aDepth - 1,
78                          bPtr.getParentNode(), bDepth - 1);
79     }
80     else if (bPtr.getParentNode() == aPtr.getParentNode())
81       return -1;
82
83     return compareTo(aPtr, aDepth, bPtr, bDepth);
84   }
85 }
86
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