DOMNamespaceIterator


1   /*
2    * Copyright 1999-2004 The Apache Software Foundation
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.apache.commons.jxpath.ri.model.dom;
17  
18  import java.util.ArrayList  ;
19  import java.util.List  ;
20  
21  import org.apache.commons.jxpath.ri.model.NodeIterator;
22  import org.apache.commons.jxpath.ri.model.NodePointer;
23  import org.w3c.dom.Attr  ;
24  import org.w3c.dom.Document  ;
25  import org.w3c.dom.NamedNodeMap  ;
26  import org.w3c.dom.Node  ;
27  
28  /**
29   * An iterator of namespaces of a DOM Node.
30   *
31   * @author Dmitri Plotnikov
32   * @version $Revision: 1.9 $ $Date: 2004/04/01 02:55:32 $
33   */
34  public class DOMNamespaceIterator implements NodeIterator {
35      private NodePointer parent;
36      private List   attributes;
37      private int position = 0;
38  
39      public DOMNamespaceIterator(NodePointer parent) {
40          this.parent = parent;
41          attributes = new ArrayList  ();
42          collectNamespaces(attributes, (Node  ) parent.getNode());
43      }
44  
45      private void collectNamespaces(List   attributes, Node   node) {
46          Node   parent = node.getParentNode();
47          if (parent != null) {
48              collectNamespaces(attributes, parent);
49          }
50          if (node.getNodeType() == Node.DOCUMENT_NODE) {
51              node = ((Document  ) node).getDocumentElement();
52          }
53          if (node.getNodeType() == Node.ELEMENT_NODE) {
54              NamedNodeMap   map = node.getAttributes();
55              int count = map.getLength();
56              for (int i = 0; i < count; i++) {
57                  Attr   attr = (Attr  ) map.item(i);
58                  String   prefix = DOMNodePointer.getPrefix(attr);
59                  String   name = DOMNodePointer.getLocalName(attr);
60                  if ((prefix != null && prefix.equals("xmlns"))
61                      || (prefix == null && name.equals("xmlns"))) {
62                      attributes.add(attr);
63                  }
64              }
65          }
66      }
67  
68      public NodePointer getNodePointer() {
69          if (position == 0) {
70              if (!setPosition(1)) {
71                  return null;
72              }
73              position = 0;
74          }
75          int index = position - 1;
76          if (index < 0) {
77              index = 0;
78          }
79          String   prefix = "";
80          Attr   attr = (Attr  ) attributes.get(index);
81          String   name = attr.getPrefix();
82          if (name != null && name.equals("xmlns")) {
83              prefix = DOMNodePointer.getLocalName(attr);
84          }
85          return new NamespacePointer(parent, prefix, attr.getValue());
86      }
87  
88      public int getPosition() {
89          return position;
90      }
91  
92      public boolean setPosition(int position) {
93          this.position = position;
94          return position >= 1 && position <= attributes.size();
95      }
96  }
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