/*

  * Licensed to the Apache Software Foundation (ASF) under one or more

  * contributor license agreements.  See the NOTICE file distributed with

  * this work for additional information regarding copyright ownership.

  * The ASF licenses this file to You under the Apache License, Version 2.0

  * (the "License"); you may not use this file except in compliance with

  * the License.  You may obtain a copy of the License at

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.apache.commons.configuration.tree.xpath;

 import java.util.ArrayList;

 import java.util.Collections;

 import java.util.List;

 import org.apache.commons.configuration.tree.ConfigurationNode;

 import org.apache.commons.jxpath.ri.QName;

 import org.apache.commons.jxpath.ri.model.NodePointer;

 /**

  * A specialized node iterator implementation that deals with attribute nodes.

  *

  * @author Oliver Heger

  * @version $Id: ConfigurationNodeIteratorAttribute.java 439648 2006-09-02 20:42:10Z oheger $

  */

 class ConfigurationNodeIteratorAttribute extends

         ConfigurationNodeIteratorBase

 {

     /** Constant for the wildcard node name.*/

     private static final String WILDCARD = "*";

     /**

      * Creates a new instance of <code>ConfigurationNodeIteratorAttribute</code>.

      * @param parent the parent node pointer

      * @param name the name of the selected attribute

      */

     public ConfigurationNodeIteratorAttribute(NodePointer parent, QName name)

     {

         super(parent, false);

         initSubNodeList(createSubNodeList((ConfigurationNode) parent.getNode(),

                 name));

     }

     /**

      * Determines which attributes are selected based on the passed in node

      * name.

      * @param node the current node

      * @param name the name of the selected attribute

      * @return a list with the selected attributes

      */

     protected List createSubNodeList(ConfigurationNode node, QName name)

     {

         if (name.getPrefix() != null)

         {

             // namespace prefixes are not supported

             return Collections.EMPTY_LIST;

         }

         List result = new ArrayList();

         if (!WILDCARD.equals(name.getName()))

         {

             result.addAll(node.getAttributes(name.getName()));

         }

         else

         {

             result.addAll(node.getAttributes());

         }

         return result;

     }

 }