/*
    * 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.maven.project.harness;
  
  import java.util.ArrayList;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  
  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.codehaus.plexus.util.xml.Xpp3Dom;
  
  /**
   * An attribute iterator for JXPath to support <code>Xpp3Dom</code>.
   *
   * @author Benjamin Bentmann
   */
  class Xpp3DomAttributeIterator implements NodeIterator {
  
      private NodePointer parent;
  
      private Xpp3Dom node;
  
      private List<Map.Entry<String, String>> attributes;
  
      private Map.Entry<String, String> attribute;
  
      private int position;
  
      public Xpp3DomAttributeIterator(NodePointer parent, QName qname) {
          this.parent = parent;
          this.node = (Xpp3Dom) parent.getNode();
  
          Map<String, String> map = new LinkedHashMap<>();
          for (String name : this.node.getAttributeNames()) {
              if (name.equals(qname.getName()) || "*".equals(qname.getName())) {
                  String value = this.node.getAttribute(name);
                  map.put(name, value);
              }
          }
          this.attributes = new ArrayList<>(map.entrySet());
      }
  
      public NodePointer getNodePointer() {
          if (position == 0) {
              setPosition(1);
          }
          return (attribute == null) ? null : new Xpp3DomAttributePointer(parent, attribute);
      }
  
      public int getPosition() {
          return position;
      }
  
      public boolean setPosition(int position) {
          this.position = position;
          attribute = (position > 0 && position <= attributes.size()) ? attributes.get(position - 1) : null;
          return attribute != null;
      }
  }