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Java > Open Source Codes > com > caucho > xpath > expr > Var


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.expr;
30
31 import com.caucho.util.CharBuffer;
32 import com.caucho.xpath.Expr;
33 import com.caucho.xpath.ExprEnvironment;
34 import com.caucho.xpath.XPathException;
35 import com.caucho.xpath.pattern.NodeArrayListIterator;
36 import com.caucho.xpath.pattern.NodeIterator;
37 import com.caucho.xpath.pattern.NodeListIterator;
38 import com.caucho.xpath.pattern.SingleNodeIterator;
39
40 import org.w3c.dom.Node JavaDoc;
41 import org.w3c.dom.NodeList JavaDoc;
42
43 import java.util.ArrayList JavaDoc;
44
45 public abstract class Var {
46   /**
47    * Returns the value as a boolean.
48    */
49   boolean getBoolean()
50     throws XPathException
51   {
52     return Expr.toBoolean(getObject());
53   }
54   
55   /**
56    * Returns the value as a double.
57    */
58   double getDouble()
59     throws XPathException
60   {
61     Object JavaDoc o = getObject();
62     return Expr.toDouble(getObject());
63   }
64   
65   /**
66    * Returns the value as a string.
67    */
68   String JavaDoc getString()
69     throws XPathException
70   {
71     return Expr.toString(getObject());
72   }
73   
74   /**
75    * Returns the value as a string.
76    */
77   void getString(CharBuffer cb)
78     throws XPathException
79   {
80     cb.append(getString());
81   }
82
83   /**
84    * Returns the value as a node set.
85    */
86   NodeIterator getNodeSet(ExprEnvironment env)
87     throws XPathException
88   {
89     Object JavaDoc obj = getObject();
90
91     if (obj instanceof Node JavaDoc)
92       return new SingleNodeIterator(env, (Node JavaDoc) obj);
93     else if (obj instanceof NodeList JavaDoc)
94       return new NodeListIterator(env, (NodeList JavaDoc) obj);
95     else if (obj instanceof ArrayList JavaDoc)
96       return new NodeArrayListIterator(env, (ArrayList JavaDoc) obj);
97     else
98       return new SingleNodeIterator(env, null);
99   }
100   
101   /**
102    * Returns the value as an object.
103    */
104   abstract Object JavaDoc getObject();
105   
106   /**
107    * Frees the var.
108    */
109   public void free()
110   {
111   }
112 }
113
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