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Java > Open Source Codes > org > openlaszlo > iv > flash > xml > caucho > XMLContextImpl


1 /*
2  * $Id: XMLContextImpl.java,v 1.2 2002/02/24 02:10:19 skavish Exp $
3  *
4  * ===========================================================================
5  *
6  * The JGenerator Software License, Version 1.0
7  *
8  * Copyright (c) 2000 Dmitry Skavish (skavish@usa.net). All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
15  *
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in
18  * the documentation and/or other materials provided with the
19  * distribution.
20  *
21  * 3. The end-user documentation included with the redistribution, if
22  * any, must include the following acknowlegement:
23  * "This product includes software developed by Dmitry Skavish
24  * (skavish@usa.net, http://www.flashgap.com/)."
25  * Alternately, this acknowlegement may appear in the software itself,
26  * if and wherever such third-party acknowlegements normally appear.
27  *
28  * 4. The name "The JGenerator" must not be used to endorse or promote
29  * products derived from this software without prior written permission.
30  * For written permission, please contact skavish@usa.net.
31  *
32  * 5. Products derived from this software may not be called "The JGenerator"
33  * nor may "The JGenerator" appear in their names without prior written
34  * permission of Dmitry Skavish.
35  *
36  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
37  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
38  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
39  * DISCLAIMED. IN NO EVENT SHALL DMITRY SKAVISH OR THE OTHER
40  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
42  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
43  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
44  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
45  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
46  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47  * SUCH DAMAGE.
48  *
49  */
50
51 package org.openlaszlo.iv.flash.xml.caucho;
52
53
54 import org.openlaszlo.iv.flash.xml.*;
55 import org.openlaszlo.iv.flash.context.*;
56 import org.openlaszlo.iv.flash.util.*;
57
58 import java.util.*;
59
60 import javax.xml.transform.TransformerException JavaDoc;
61
62 import org.w3c.dom.*;
63 import org.w3c.dom.traversal.NodeIterator;
64
65 import com.caucho.xpath.*;
66
67 /**
68  * Resin XML context
69  * <P>
70  * Represents one xml node
71  *
72  * @author Dmitry Skavish
73  */
74
75 public class XMLContextImpl extends XMLContext {
76
77     /**
78      * Creates xml context with specified parent and xml node.
79      *
80      * @param parent parent context
81      * @param node xml node represented by this context
82      */
83
84     public XMLContextImpl( Context parent, Node node ) {
85         super(parent, node);
86     }
87
88     /**
89      * Evaluates the specified path ( as XPath ) in this context or nearest
90      * xml parent.
91      *
92      * @param string containing XPath expression
93      * @return string representation of result of xpath execution or empty string
94      */
95     public String JavaDoc getValue( String JavaDoc path ) {
96         // Evaluate the XPath in this context
97
98         //System.out.println( "XMLContext.getValue("+path+")" );
99 try {
100             String JavaDoc value = XPath.evalString(path, node);
101
102             if( value != null && value.length() > 0 /*&& !isUndefined( xo )*/ ) {
103                 return value;
104             }
105         } catch( com.caucho.xpath.XPathException e ) {
106             // ignore this exception, it usually means that it is not an
107 // xpath, but just a variable
108 } catch( Exception JavaDoc e ) {
109             Log.logRB(e);
110         }
111
112         return getValueFromParent( path );
113     }
114
115     /**
116      * Evaluates the specified path ( as XPath ) in this context or nearest
117      * xml parent. If the path evaluates to a nodeset, a list of contexts for
118      * the nodes in that nodeset is returned, otherwise null
119      *
120      * @param string containing XPath expression
121      * @returns list of contexts or null
122      */
123     public List getValueList( String JavaDoc path ) {
124
125         try {
126             Iterator it = XPath.select(path, node);
127             if( it != null ) {
128                 ArrayList list = new ArrayList();
129                 while( it.hasNext() ) {
130                     Node n = (Node) it.next();
131                     list.add(new XMLContextImpl(this, n));
132                 }
133
134                 return list;
135             }
136         } catch( com.caucho.xpath.XPathException e ) {
137         }
138
139         // The path either evaluated to nothing ( an unresolvable path ) or an
140 // atomic type. Neither of these suit our purposes ( I think ) so for
141 // now defer to the parent.
142
143         return getValueListFromParent( path );
144     }
145
146 }
147
148
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