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Java > Open Source Codes > org > xmldb > xupdate > lexus > commands > InsertVariable


1 package org.xmldb.xupdate.lexus.commands;
2
3 /*
4  * The XML:DB Initiative Software License, Version 1.0
5  *
6  *
7  * Copyright (c) 2000-2003 The XML:DB Initiative. All rights
8  * reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  *
14  * 1. Redistributions of source code must retain the above copyright
15  * notice, this list of conditions and the following disclaimer.
16  *
17  * 2. Redistributions in binary form must reproduce the above copyright
18  * notice, this list of conditions and the following disclaimer in
19  * the documentation and/or other materials provided with the
20  * distribution.
21  *
22  * 3. The end-user documentation included with the redistribution,
23  * if any, must include the following acknowledgment:
24  * "This product includes software developed by the
25  * XML:DB Initiative (http://www.xmldb.org/)."
26  * Alternately, this acknowledgment may appear in the software itself,
27  * if and wherever such third-party acknowledgments normally appear.
28  *
29  * 4. The name "XML:DB Initiative" must not be used to endorse or
30  * promote products derived from this software without prior written
31  * permission. For written permission, please contact info@xmldb.org.
32  *
33  * 5. Products derived from this software may not be called "XML:DB",
34  * nor may "XML:DB" appear in their name, without prior written
35  * permission of the XML:DB Initiative.
36  *
37  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40  * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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48  * SUCH DAMAGE.
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51  * This software consists of voluntary contributions made by many
52  * individuals on behalf of the XML:DB Initiative. For more information
53  * on the XML:DB Initiative, please see <http://www.xmldb.org/>.
54  */
55
56 import org.w3c.dom.Attr JavaDoc;
57 import org.w3c.dom.Element JavaDoc;
58 import org.w3c.dom.Node JavaDoc;
59 import org.w3c.dom.NodeList JavaDoc;
60 import org.xmldb.common.xml.queries.XObject;
61 import org.xmldb.common.xml.queries.XPathQuery;
62 import org.xmldb.common.xml.queries.XPathQueryFactory;
63
64 /**
65  *
66  * @version $Id: InsertVariable.java,v 1.6 2003/05/21 08:17:38 jbreedveld Exp $
67  * @author <a HREF="http://www.smb-tec.com">SMB</a>
68  */
69 public class InsertVariable extends InsertStates {
70
71   /**
72    *
73    */
74   public InsertVariable() {
75     super();
76   }
77
78
79   /**
80    *
81    */
82   public Node JavaDoc execute(Node JavaDoc contextNode) throws Exception JavaDoc {
83     String JavaDoc selection = (String JavaDoc) attributes.get("select");
84
85     NodeList JavaDoc newNodes = null;
86     if (selection.charAt(0) == '$') {
87       String JavaDoc name = selection.substring(1);
88       newNodes = CommandConstants.tempTree.getTreeForName(name);
89     } else {
90       newNodes = selectNewNodes(selection, contextNode);
91     }
92
93     Node JavaDoc result = contextNode;
94     int newNodesLength = newNodes.getLength();
95     for (int i = 0; i < newNodesLength; i++) {
96       Node JavaDoc current = newNodes.item(i);
97       switch (current.getNodeType()) {
98         case Node.ATTRIBUTE_NODE:
99           switch (contextNode.getNodeType()) {
100             case Node.ELEMENT_NODE:
101               Attr JavaDoc attribute = (Attr JavaDoc) current.cloneNode(true);
102               ((Element JavaDoc) contextNode).setAttributeNode(attribute);
103               result = attribute;
104               break;
105             default:
106               throw new Exception JavaDoc("can't append attribute !");
107           }
108           break;
109         default:
110           result = contextNode.appendChild(current.cloneNode(true));
111       }
112     }
113     return result;
114   }
115
116   /**
117    *
118    */
119   protected NodeList JavaDoc selectNewNodes(String JavaDoc query, Node JavaDoc contextNode) throws Exception JavaDoc {
120     XPathQuery xpath = XPathQueryFactory.newInstance().newXPathQuery();
121     xpath.setQString(query);
122     XObject xResult = xpath.execute(contextNode);
123     if (xResult.getType() != XObject.CLASS_NODESET) {
124       throw new Exception JavaDoc("XPath leads not to a Node or NodeList !");
125     }
126     NodeList JavaDoc result = xResult.nodeset();
127     return result;
128   }
129 }
130
131
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