/*
    * 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.List;
  
  import org.apache.commons.jxpath.ri.QName;
  import org.apache.commons.jxpath.ri.compiler.NodeTest;
  import org.apache.commons.jxpath.ri.model.NodeIterator;
  import org.apache.commons.jxpath.ri.model.NodePointer;
  import org.apache.maven.api.xml.XmlNode;
  
  /**
   * A node pointer for JXPath to support <code>Xpp3Dom</code>.
   *
   * @author Benjamin Bentmann
   */
  class Xpp3DomNodePointer extends NodePointer {
  
      private XmlNode node;
  
      public Xpp3DomNodePointer(XmlNode node) {
          super(null);
          this.node = node;
      }
  
      public Xpp3DomNodePointer(NodePointer parent, XmlNode node) {
          super(parent);
          this.node = node;
      }
  
      @Override
      public int compareChildNodePointers(NodePointer pointer1, NodePointer pointer2) {
          XmlNode node1 = (XmlNode) pointer1.getBaseValue();
          XmlNode node2 = (XmlNode) pointer2.getBaseValue();
          if (node1 == node2) {
              return 0;
          }
          for (XmlNode child : node.getChildren()) {
              if (child == node1) {
                  return -1;
              }
              if (child == node2) {
                  return 1;
              }
          }
          return 0;
      }
  
      @Override
      public Object getValue() {
          return getValue(node);
      }
  
      private static Object getValue(XmlNode node) {
          if (node.getValue() != null) {
              return node.getValue();
          } else {
              List<Object> children = new ArrayList<>();
              for (XmlNode child : node.getChildren()) {
                  children.add(getValue(child));
              }
              return children;
          }
      }
  
      @Override
      public Object getBaseValue() {
          return node;
      }
  
      @Override
      public Object getImmediateNode() {
          return node;
      }
  
      @Override
      public int getLength() {
          return 1;
      }
  
      @Override
     public QName getName() {
         return new QName(null, node.getName());
     }
 
     @Override
     public boolean isCollection() {
         return false;
     }
 
     @Override
     public boolean isLeaf() {
         return node.getChildren().isEmpty();
     }
 
     @Override
     public void setValue(Object value) {
         throw new UnsupportedOperationException();
     }
 
     @Override
     public NodeIterator childIterator(NodeTest test, boolean reverse, NodePointer startWith) {
         return new Xpp3DomNodeIterator(this, test, reverse, startWith);
     }
 
     @Override
     public NodeIterator attributeIterator(QName qname) {
         return new Xpp3DomAttributeIterator(this, qname);
     }
 }