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 1999-2004 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: HasPositionalPredChecker.java,v 1.1.2.1 2005/08/01 01:30:24 jeffsuttor Exp $
   */
  package jaxp.sun.org.apache.xpath.internal.axes;
  
  import jaxp.sun.org.apache.xpath.internal.Expression;
  import jaxp.sun.org.apache.xpath.internal.ExpressionOwner;
  import jaxp.sun.org.apache.xpath.internal.XPathVisitor;
  import jaxp.sun.org.apache.xpath.internal.functions.FuncLast;
  import jaxp.sun.org.apache.xpath.internal.functions.FuncPosition;
  import jaxp.sun.org.apache.xpath.internal.functions.Function;
  import jaxp.sun.org.apache.xpath.internal.objects.XNumber;
  import jaxp.sun.org.apache.xpath.internal.operations.Div;
  import jaxp.sun.org.apache.xpath.internal.operations.Minus;
  import jaxp.sun.org.apache.xpath.internal.operations.Mod;
  import jaxp.sun.org.apache.xpath.internal.operations.Mult;
  import jaxp.sun.org.apache.xpath.internal.operations.Number;
  import jaxp.sun.org.apache.xpath.internal.operations.Plus;
  import jaxp.sun.org.apache.xpath.internal.operations.Quo;
  import jaxp.sun.org.apache.xpath.internal.operations.Variable;
  
  public class HasPositionalPredChecker extends XPathVisitor
  {
          private boolean m_hasPositionalPred = false;
          private int m_predDepth = 0;
  
          /**
           * Process the LocPathIterator to see if it contains variables
           * or functions that may make it context dependent.
           * @param path LocPathIterator that is assumed to be absolute, but needs checking.
           * @return true if the path is confirmed to be absolute, false if it
           * may contain context dependencies.
           */
          public static boolean check(LocPathIterator path)
          {
                  HasPositionalPredChecker hppc = new HasPositionalPredChecker();
                  path.callVisitors(null, hppc);
                  return hppc.m_hasPositionalPred;
          }
  
          /**
           * Visit a function.
           * @param owner The owner of the expression, to which the expression can
           *              be reset if rewriting takes place.
           * @param func The function reference object.
           * @return true if the sub expressions should be traversed.
           */
          public boolean visitFunction(ExpressionOwner owner, Function func)
          {
                  if((func instanceof FuncPosition) ||
                     (func instanceof FuncLast))
                          m_hasPositionalPred = true;
                  return true;
          }
  
  //      /**
  //       * Visit a variable reference.
  //       * @param owner The owner of the expression, to which the expression can
  //       *              be reset if rewriting takes place.
  //       * @param var The variable reference object.
  //       * @return true if the sub expressions should be traversed.
  //       */
  //      public boolean visitVariableRef(ExpressionOwner owner, Variable var)
  //      {
  //              m_hasPositionalPred = true;
  //              return true;
  //      }
  
    /**
     * Visit a predicate within a location path.  Note that there isn't a
     * proper unique component for predicates, and that the expression will
     * be called also for whatever type Expression is.
     *
     * @param owner The owner of the expression, to which the expression can
     *              be reset if rewriting takes place.
     * @param pred The predicate object.
     * @return true if the sub expressions should be traversed.
     */
    public boolean visitPredicate(ExpressionOwner owner, Expression pred)
    {
      m_predDepth++;
  
      if(m_predDepth == 1)
      {
        if((pred instanceof Variable) ||
           (pred instanceof XNumber) ||
           (pred instanceof Div) ||
           (pred instanceof Plus) ||
           (pred instanceof Minus) ||
           (pred instanceof Mod) ||
           (pred instanceof Quo) ||
           (pred instanceof Mult) ||
           (pred instanceof Number) ||
           (pred instanceof Function))
            m_hasPositionalPred = true;
        else
          pred.callVisitors(owner, this);
      }
  
      m_predDepth--;
  
      // Don't go have the caller go any further down the subtree.
      return false;
    }
  
  
  }
  