content: /*
   * 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 mf.org.apache.xerces.dom;
  
  import mf.org.w3c.dom.Node;
  
  /**
   * ChildNode inherits from NodeImpl and adds the capability of being a child by
   * having references to its previous and next siblings.
   *
   * @version $Id: ChildNode.java 447266 2006-09-18 05:57:49Z mrglavas $
   * @xerces.internal
   */
  public abstract class ChildNode
          extends NodeImpl {
  
      //
      // Constants
      //
  
      /**
       * Serialization version.
       */
      static final long serialVersionUID = -6112455738802414002L;
  
      //
      // Data
      //
  
      /**
       * Previous sibling.
       */
      protected ChildNode previousSibling;
  
      /**
       * Next sibling.
       */
      protected ChildNode nextSibling;
  
      //
      // Constructors
      //
  
      /**
       * No public constructor; only subclasses of Node should be
       * instantiated, and those normally via a Document's factory methods
       * <p/>
       * Every Node knows what Document it belongs to.
       */
      protected ChildNode(CoreDocumentImpl ownerDocument) {
          super(ownerDocument);
      } // <init>(CoreDocumentImpl)
  
      /**
       * Constructor for serialization.
       */
      public ChildNode() {
      }
  
      //
      // Node methods
      //
  
      /**
       * Returns a duplicate of a given node. You can consider this a
       * generic "copy constructor" for nodes. The newly returned object should
       * be completely independent of the source object's subtree, so changes
       * in one after the clone has been made will not affect the other.
       * <p/>
       * Note: since we never have any children deep is meaningless here,
       * ParentNode overrides this behavior.
       *
       * @see ParentNode
       * <p/>
       * <p/>
       * Example: Cloning a Text node will copy both the node and the text it
       * contains.
       * <p/>
       * Example: Cloning something that has children -- Element or Attr, for
       * example -- will _not_ clone those children unless a "deep clone"
       * has been requested. A shallow clone of an Attr node will yield an
       * empty Attr of the same name.
       * <p/>
       * NOTE: Clones will always be read/write, even if the node being cloned
       * is read-only, to permit applications using only the DOM API to obtain
       * editable copies of locked portions of the tree.
       */
      @Override
      public Node cloneNode(boolean deep) {
  
          ChildNode newnode = (ChildNode) super.cloneNode(deep);
  
          // Need to break the association w/ original kids
          newnode.previousSibling = null;
          newnode.nextSibling = null;
          newnode.isFirstChild(false);
  
          return newnode;
  
      } // cloneNode(boolean):Node
  
      /**
       * Returns the parent node of this node
       */
      @Override
      public Node getParentNode() {
          // if we have an owner, ownerNode is our parent, otherwise it's
          // our ownerDocument and we don't have a parent
          return isOwned() ? ownerNode : null;
      }
  
      /*
       * same as above but returns internal type
       */
      @Override
      final NodeImpl parentNode() {
          // if we have an owner, ownerNode is our parent, otherwise it's
          // our ownerDocument and we don't have a parent
          return isOwned() ? ownerNode : null;
      }
  
      /**
       * The next child of this node's parent, or null if none
       */
      @Override
      public Node getNextSibling() {
          return nextSibling;
      }
  
      /**
       * The previous child of this node's parent, or null if none
       */
      @Override
      public Node getPreviousSibling() {
          // if we are the firstChild, previousSibling actually refers to our
          // parent's lastChild, but we hide that
          return isFirstChild() ? null : previousSibling;
      }
  
      /*
       * same as above but returns internal type
       */
      @Override
      final ChildNode previousSibling() {
          // if we are the firstChild, previousSibling actually refers to our
          // parent's lastChild, but we hide that
          return isFirstChild() ? null : previousSibling;
      }
  
  } // class ChildNode
  