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


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
47  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48  * SUCH DAMAGE.
49  * ====================================================================
50  *
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.Comment JavaDoc;
58 import org.w3c.dom.Node JavaDoc;
59 import org.w3c.dom.NodeList JavaDoc;
60
61 import org.apache.log4j.Category;
62
63 /**
64  *
65  * @version $Id: UpdateCommand.java,v 1.4 2003/05/21 08:17:38 jbreedveld Exp $
66  * @author <a HREF="http://www.smb-tec.com">SMB</a>
67  */
68 public class UpdateCommand extends CommandObject {
69   Category log = Category.getInstance(UpdateCommand.class);
70
71
72   /**
73    *
74    */
75   public UpdateCommand(Node JavaDoc contextNode) throws Exception JavaDoc {
76     super(contextNode);
77   }
78
79
80   /**
81    * @return Always <code>false</code>.
82    */
83   public boolean submitInstruction(int instruction) {
84     //does nothing
85 return false;
86   }
87
88
89   /**
90    * @return Always <code>false</code>.
91    */
92   public boolean executeInstruction() {
93     //does nothing
94 return false;
95   }
96
97
98   /**
99    *
100    */
101   public Node JavaDoc execute() throws Exception JavaDoc {
102     String JavaDoc data = "";
103     for (int i = 0; i < characters.size(); i++) {
104       data += (String JavaDoc) characters.elementAt(i);
105     }
106     String JavaDoc selection = (String JavaDoc) attributes.get("select");
107     selectNodes(selection);
108     int selectionLength = selectionNodeList.getLength();
109     for (int i = 0; i < selectionNodeList.getLength(); i++) {
110       Node JavaDoc current = selectionNodeList.item(i);
111       switch (current.getNodeType()) {
112         case Node.ELEMENT_NODE:
113           current.normalize();
114           NodeList JavaDoc children = current.getChildNodes();
115           int childrenLength = children.getLength();
116           for (int j = childrenLength -1 ; j >= 0; j--) {
117             log.debug(".execute(): Remove child (" + j + "): " + children.item(j).getNodeType());
118             if (children.item(j).getNodeType() == Node.TEXT_NODE) {
119               log.debug(".execute(): TEXT_NODE: " + children.item(j).getNodeValue());
120             }
121             current.removeChild(children.item(j));
122           }
123           if (characters.size() > 0) {
124             current.appendChild(document.createTextNode(data));
125           }
126           break;
127         case Node.TEXT_NODE:
128           if (characters.size() > 0) {
129             current.setNodeValue(data);
130           } else {
131             Node JavaDoc parent = current.getParentNode();
132             parent.removeChild(current);
133           }
134           break;
135         case Node.COMMENT_NODE:
136           ((Comment JavaDoc) current).setData(data);
137           break;
138         case Node.ATTRIBUTE_NODE:
139           ((Attr JavaDoc) current).setValue(data);
140           break;
141         default:
142           if (characters.size() == 0) {
143             throw new Exception JavaDoc("[update] new values must not be empty !");
144           }
145           current.setNodeValue(data);
146       }
147     }
148     return contextNode;
149   }
150 }
151
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