content: /*
   *  This file is part of AndroidIDE.
   *
   *  AndroidIDE is free software: you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation, either version 3 of the License, or
   *  (at your option) any later version.
   *
   *  AndroidIDE is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * reserved comment block
   * DO NOT REMOVE OR ALTER!
   */
  /*
   * Copyright 2001-2004 The Apache Software Foundation.
   *
   * Licensed 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.
   */
  /*
   * $Id: ForwardPositionIterator.java,v 1.2.4.1 2005/09/06 06:22:05 pvedula Exp $
   */
  
  package jaxp.sun.org.apache.xalan.internal.xsltc.dom;
  
  import jaxp.sun.org.apache.xalan.internal.xsltc.runtime.BasisLibrary;
  import jaxp.sun.org.apache.xml.internal.dtm.DTMAxisIterator;
  import jaxp.sun.org.apache.xml.internal.dtm.ref.DTMAxisIteratorBase;
  
  /**
   * This iterator is a wrapper that always returns the position of
   * a node in document order. It is needed for the case where
   * a call to position() occurs in the context of an XSLT element
   * such as xsl:for-each, xsl:apply-templates, etc.
   *
   * The getPosition() methods in DTMAxisIterators defined
   * in DTMDefaultBaseIterators always return the position
   * in document order, which is backwards for XPath in the
   * case of the ancestor, ancestor-or-self, previous and
   * previous-sibling.
   *
   * XSLTC implements position() with the
   * BasisLibrary.positionF() method, and uses the
   * DTMAxisIterator.isReverse() method to determine
   * whether the result of getPosition() should be
   * interpreted as being equal to position().
   * But when the expression appears in apply-templates of
   * for-each, the position() function operates in document
   * order.
   *
   * The only effect of the ForwardPositionIterator is to force
   * the result of isReverse() to false, so that
   * BasisLibrary.positionF() calculates position() in a way
   * that's consistent with the context in which the
   * iterator is being used."
   *
   * (Apparently the correction of isReverse() occurs
   * implicitly, by inheritance. This class also appears
   * to maintain its own position counter, which seems
   * redundant.)
   *
   * @deprecated This class exists only for backwards compatibility with old
   *             translets.  New code should not reference it.
   */
  public final class ForwardPositionIterator extends DTMAxisIteratorBase {
  
      private DTMAxisIterator _source;
  
      public ForwardPositionIterator(DTMAxisIterator source) {
          _source = source;
      }
  
      public DTMAxisIterator cloneIterator() {
          try {
              final ForwardPositionIterator clone =
                  (ForwardPositionIterator) super.clone();
              clone._source = _source.cloneIterator();
              clone._isRestartable = false;
              return clone.reset();
          }
          catch (CloneNotSupportedException e) {
              BasisLibrary.runTimeError(BasisLibrary.ITERATOR_CLONE_ERR,
                                        e.toString());
              return null;
          }
      }
  
      public int next() {
          return returnNode(_source.next());
      }
  
      public DTMAxisIterator setStartNode(int node) {
          _source.setStartNode(node);
          return this;
      }
  
      public DTMAxisIterator reset() {
          _source.reset();
          return resetPosition();
      }
  
      public void setMark() {
          _source.setMark();
      }
  
      public void gotoMark() {
          _source.gotoMark();
      }
  }
  