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


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 com.caucho.xml.XmlUtil;
32 import com.caucho.xpath.ExprEnvironment;
33
34 import org.w3c.dom.Node JavaDoc;
35
36 /**
37  * matches any node. The 'any' axis is the root of a match pattern.
38  */
39 public class FromAny extends Axis {
40   public FromAny()
41   {
42     super(null);
43   }
44
45   /**
46    * All nodes match
47    *
48    * @param node the current node
49    * @param env the variable environment
50    *
51    * @return true
52    */
53   public boolean match(Node JavaDoc node, ExprEnvironment env)
54   {
55     return true;
56   }
57   
58   /**
59    * Returns the first node in the selection order.
60    *
61    * @param node the current node
62    *
63    * @return the first node
64    */
65   public Node JavaDoc firstNode(Node JavaDoc node, ExprEnvironment env)
66   {
67     Node JavaDoc owner = node.getOwnerDocument();
68     if (owner == null)
69       return node;
70     else
71       return owner;
72   }
73
74   /**
75    * Returns the next node in the selection order.
76    *
77    * @param node the current node
78    * @param lastNode the last node
79    *
80    * @return the next node
81    */
82   public Node JavaDoc nextNode(Node JavaDoc node, Node JavaDoc lastNode)
83   {
84     return XmlUtil.getNext(node);
85   }
86
87   /**
88    * The root is strictly ascending.
89    */
90   public boolean isStrictlyAscending()
91   {
92     return false;
93   }
94
95   /*
96    * Should be impossible to call position() with the any pattern.
97    *
98    * @param node the current node
99    * @param env the variable environment
100    * @param pattern the position pattern
101    */
102   public int position(Node JavaDoc node, ExprEnvironment env, AbstractPattern pattern)
103   {
104     throw new RuntimeException JavaDoc();
105   }
106
107   /*
108    * Should be impossible to call last() with the any pattern.
109    *
110    * @param node the current node
111    * @param env the variable environment
112    * @param pattern the position pattern
113    */
114   public int count(Node JavaDoc node, ExprEnvironment env, AbstractPattern pattern)
115   {
116     throw new RuntimeException JavaDoc();
117   }
118
119   /**
120    * Returns true if the two patterns are equal.
121    */
122   public boolean equals(Object JavaDoc b)
123   {
124     return b instanceof FromAny;
125   }
126
127   public String JavaDoc toString()
128   {
129     return "node()";
130   }
131 }
132
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