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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.configuration.tree.xpath;
18  
19  import java.util.ArrayList;
20  import java.util.Collections;
21  import java.util.List;
22  
23  import org.apache.commons.configuration.tree.ConfigurationNode;
24  import org.apache.commons.jxpath.ri.QName;
25  import org.apache.commons.jxpath.ri.model.NodePointer;
26  
27  /***
28   * A specialized node iterator implementation that deals with attribute nodes.
29   *
30   * @author Oliver Heger
31   * @version $Id: ConfigurationNodeIteratorAttribute.java 439648 2006-09-02 20:42:10Z oheger $
32   */
33  class ConfigurationNodeIteratorAttribute extends
34          ConfigurationNodeIteratorBase
35  {
36      /*** Constant for the wildcard node name.*/
37      private static final String WILDCARD = "*";
38  
39      /***
40       * Creates a new instance of <code>ConfigurationNodeIteratorAttribute</code>.
41       * @param parent the parent node pointer
42       * @param name the name of the selected attribute
43       */
44      public ConfigurationNodeIteratorAttribute(NodePointer parent, QName name)
45      {
46          super(parent, false);
47          initSubNodeList(createSubNodeList((ConfigurationNode) parent.getNode(),
48                  name));
49      }
50  
51      /***
52       * Determines which attributes are selected based on the passed in node
53       * name.
54       * @param node the current node
55       * @param name the name of the selected attribute
56       * @return a list with the selected attributes
57       */
58      protected List createSubNodeList(ConfigurationNode node, QName name)
59      {
60          if (name.getPrefix() != null)
61          {
62              // namespace prefixes are not supported
63              return Collections.EMPTY_LIST;
64          }
65  
66          List result = new ArrayList();
67          if (!WILDCARD.equals(name.getName()))
68          {
69              result.addAll(node.getAttributes(name.getName()));
70          }
71          else
72          {
73              result.addAll(node.getAttributes());
74          }
75  
76          return result;
77      }
78  }