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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 <a
31   * href="http://commons.apache.org/configuration/team-list.html">Commons
32   * Configuration team</a>
33   * @version $Id: ConfigurationNodeIteratorAttribute.java 1206492 2011-11-26 16:52:16Z oheger $
34   */
35  class ConfigurationNodeIteratorAttribute extends
36          ConfigurationNodeIteratorBase
37  {
38      /** Constant for the wildcard node name.*/
39      private static final String WILDCARD = "*";
40  
41      /**
42       * Creates a new instance of {@code ConfigurationNodeIteratorAttribute}.
43       * @param parent the parent node pointer
44       * @param name the name of the selected attribute
45       */
46      public ConfigurationNodeIteratorAttribute(NodePointer parent, QName name)
47      {
48          super(parent, false);
49          initSubNodeList(createSubNodeList((ConfigurationNode) parent.getNode(),
50                  name));
51      }
52  
53      /**
54       * Determines which attributes are selected based on the passed in node
55       * name.
56       * @param node the current node
57       * @param name the name of the selected attribute
58       * @return a list with the selected attributes
59       */
60      protected List<ConfigurationNode> createSubNodeList(ConfigurationNode node, QName name)
61      {
62          if (name.getPrefix() != null)
63          {
64              // namespace prefixes are not supported
65              return Collections.emptyList();
66          }
67  
68          List<ConfigurationNode> result = new ArrayList<ConfigurationNode>();
69          if (!WILDCARD.equals(name.getName()))
70          {
71              result.addAll(node.getAttributes(name.getName()));
72          }
73          else
74          {
75              result.addAll(node.getAttributes());
76          }
77  
78          return result;
79      }
80  }