/*
    * 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.jxpath.ri.model.jdom;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  import org.apache.commons.jxpath.ri.QName;
  import org.apache.commons.jxpath.ri.model.NodeIterator;
  import org.apache.commons.jxpath.ri.model.NodePointer;
  import org.jdom.Attribute;
  import org.jdom.Element;
  import org.jdom.Namespace;
  
  /**
   * An iterator of attributes of a DOM Node.
   *
   * @author Dmitri Plotnikov
   * @version $Revision: 652845 $ $Date: 2008-05-02 19:46:46 +0200 (Fr, 02 Mai 2008) $
   */
  public class JDOMAttributeIterator implements NodeIterator {
      private NodePointer parent;
      private List attributes;
      private int position = 0;
  
      /**
       * Create a new JDOMAttributeIterator.
       * @param parent pointer
       * @param name test
       */
      public JDOMAttributeIterator(NodePointer parent, QName name) {
          this.parent = parent;
          if (parent.getNode() instanceof Element) {
              Element element = (Element) parent.getNode();
              String prefix = name.getPrefix();
              Namespace ns = null;
              if (prefix != null) {
                  if (prefix.equals("xml")) {
                      ns = Namespace.XML_NAMESPACE;
                  }
                  else {
                      String uri = parent.getNamespaceResolver().getNamespaceURI(prefix);
                      if (uri != null) {
                          ns = Namespace.getNamespace(prefix, uri);
                      }
                      if (ns == null) {
                          // TBD: no attributes
                          attributes = Collections.EMPTY_LIST;
                          return;
                      }
                  }
              }
              else {
                  ns = Namespace.NO_NAMESPACE;
              }
  
              String lname = name.getName();
              if (!lname.equals("*")) {
                  attributes = new ArrayList();
                  Attribute attr = element.getAttribute(lname, ns);
                  if (attr != null) {
                      attributes.add(attr);
                  }
              }
              else {
                  attributes = new ArrayList();
                  List allAttributes = element.getAttributes();
                  for (int i = 0; i < allAttributes.size(); i++) {
                      Attribute attr = (Attribute) allAttributes.get(i);
                      if (ns == Namespace.NO_NAMESPACE
                              || attr.getNamespace().equals(ns)) {
                          attributes.add(attr);
                      }
                  }
              }
          }
      }
  
      public NodePointer getNodePointer() {
          if (position == 0) {
              if (!setPosition(1)) {
                  return null;
              }
              position = 0;
         }
         int index = position - 1;
         if (index < 0) {
             index = 0;
         }
         return new JDOMAttributePointer(
             parent,
             (Attribute) attributes.get(index));
     }
 
     public int getPosition() {
         return position;
     }
 
     public boolean setPosition(int position) {
         if (attributes == null) {
             return false;
         }
         this.position = position;
         return position >= 1 && position <= attributes.size();
     }
 }