FromParent


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.xpath.ExprEnvironment;
32  import com.caucho.xpath.XPathException;
33  
34  import org.w3c.dom.Node  ;
35  
36  public class FromParent extends Axis {
37    public FromParent(AbstractPattern parent)
38    {
39      super(parent);
40  
41      if (parent == null)
42        throw new RuntimeException  ();
43    }
44  
45    /**
46     * Matches if a child matches the parent pattern.
47     *
48     * @param node the current node
49     * @param env the variable environment
50     *
51     * @return true if the pattern matches
52     */
53    public boolean match(Node   node, ExprEnvironment env)
54      throws XPathException
55    {
56      if (node == null)
57        return false;
58  
59      if (node.getNodeType() != node.ELEMENT_NODE &&
60      node.getNodeType() != node.DOCUMENT_NODE)
61        return false;
62  
63      for (node = node.getFirstChild();
64       node != null;
65       node = node.getNextSibling()) {
66        if (_parent.match(node, env))
67      return true;
68      }
69      
70      return false;
71    }
72  
73    /**
74     * The parent is strictly ascending if there's only one possible selection.
75     */
76    public boolean isStrictlyAscending()
77    {
78      return isSingleSelect();
79    }
80    
81    /**
82     * Returns true if the pattern selects a single node
83     */
84    boolean isSingleSelect()
85    {
86      return _parent == null ? true : _parent.isSingleSelect();
87    }
88  
89    /**
90     * Returns the first node in the selection order.
91     *
92     * @param node the current node
93     *
94     * @return the first node
95     */
96    public Node   firstNode(Node   node, ExprEnvironment env)
97    {
98      return node.getParentNode();
99    }
100 
101   /**
102    * Returns the next node in the selection order.
103    *
104    * @param node the current node
105    * @param lastNode the last node
106    *
107    * @return the next node
108    */
109   public Node   nextNode(Node   node, Node   lastNode)
110   {
111     return null;
112   }
113 
114   public String   toString()
115   {
116     return getPrefix() + "parent::";
117   }
118 }
119
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