OzoneXPathQuery


1   // You can redistribute this software and/or modify it under the terms of
2   // the Ozone Library License version 1 published by ozone-db.org.
3   //
4   // The original code and portions created by SMB are
5   // Copyright (C) 1997-@year@ by SMB GmbH. All rights reserved.
6   //
7   // $Id: OzoneXPathQuery.java,v 1.1 2003/11/02 17:26:15 per_nyfelt Exp $
8   
9   package org.ozoneDB.xml.util;
10  
11  import java.io.*;
12  
13  import org.w3c.dom.Node  ;
14  import org.w3c.dom.traversal.NodeFilter;
15  import org.infozone.tools.xml.queries.XObject;
16  import org.infozone.tools.xml.queries.XPathQuery;
17  
18  /**
19   * This class represents a XPath that can be used to query the document of
20   * a {@link XMLContainer}.
21   *
22   * @version $Revision: 1.1 $ $Date: 2003/11/02 17:26:15 $
23   * @author <a HREF="http://www.softwarebuero.de">SMB</a>
24   * @see XMLContainer
25   */
26  public final class OzoneXPathQuery implements XPathQuery, Externalizable {
27  
28      protected final static long serialVersionUID = 1L;
29  
30      protected String   qstring;
31  
32      protected NodeFilter filter;
33  
34      protected Node   namespace;
35  
36      protected Node   rootNode;
37  
38      protected transient XMLContainer delegate;
39  
40      public OzoneXPathQuery() {
41      }
42  
43      protected OzoneXPathQuery(XMLContainer _delegate) {
44          delegate = _delegate;
45      }
46  
47      public void setQString(String   _qstring) throws Exception   {
48          qstring = _qstring;
49      }
50  
51      public void setNamespace(Node   _namespace) throws Exception   {
52          namespace = _namespace;
53      }
54  
55      public void setNodeFilter(NodeFilter _filter) throws Exception   {
56          filter = _filter;
57      }
58  
59      /**
60       * Execute the xpath.
61       *
62       * @see #execute(Node)
63       */
64      public XObject execute() throws Exception   {
65          return execute(null);
66      }
67  
68      /**
69       * Execute the xpath.
70       *
71       * @param _rootNode The node from which the query should start. A value of
72       *     null specifies that the entire document should be searched.
73       * @return The XObject insulating the query result.
74       */
75      public XObject execute(Node   _rootNode) throws Exception   {
76          rootNode = _rootNode;
77          return delegate.executeXPath(this);
78      }
79  
80      public void writeExternal(ObjectOutput out) throws IOException {
81          out.writeObject(rootNode);
82          out.writeObject(qstring);
83          out.writeObject(filter);
84          out.writeObject(namespace);
85      }
86  
87      public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException   {
88          rootNode = (Node  ) in.readObject();
89          qstring = (String  ) in.readObject();
90          filter = (NodeFilter) in.readObject();
91          namespace = (Node  ) in.readObject();
92      }
93  }
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