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   *  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 2002-2004 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: XPathVisitor.java,v 1.1.2.1 2005/08/01 01:30:11 jeffsuttor Exp $
   */
  package jaxp.sun.org.apache.xpath.internal;
  
  import jaxp.sun.org.apache.xpath.internal.axes.LocPathIterator;
  import jaxp.sun.org.apache.xpath.internal.axes.UnionPathIterator;
  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.objects.XString;
  import jaxp.sun.org.apache.xpath.internal.operations.Operation;
  import jaxp.sun.org.apache.xpath.internal.operations.UnaryOperation;
  import jaxp.sun.org.apache.xpath.internal.operations.Variable;
  import jaxp.sun.org.apache.xpath.internal.patterns.NodeTest;
  import jaxp.sun.org.apache.xpath.internal.patterns.StepPattern;
  import jaxp.sun.org.apache.xpath.internal.patterns.UnionPattern;
  
  /**
   * A derivation from this class can be passed to a class that implements
   * the XPathVisitable interface, to have the appropriate method called
   * for each component of the XPath.  Aside from possible other uses, the
   * main intention is to provide a reasonable means to perform expression
   * rewriting.
   *
   * <p>Each method has the form
   * <code>boolean visitComponentType(ExpressionOwner owner, ComponentType compType)</code>.
   * The ExpressionOwner argument is the owner of the component, and can
   * be used to reset the expression for rewriting.  If a method returns
   * false, the sub hierarchy will not be traversed.</p>
   *
   * <p>This class is meant to be a base class that will be derived by concrete classes,
   * and doesn't much except return true for each method.</p>
   */
  public class XPathVisitor
  {
          /**
           * Visit a LocationPath.
           * @param owner The owner of the expression, to which the expression can
           *              be reset if rewriting takes place.
           * @param path The LocationPath object.
           * @return true if the sub expressions should be traversed.
           */
          public boolean visitLocationPath(ExpressionOwner owner, LocPathIterator path)
          {
                  return true;
          }
  
          /**
           * Visit a UnionPath.
           * @param owner The owner of the expression, to which the expression can
           *              be reset if rewriting takes place.
           * @param path The UnionPath object.
           * @return true if the sub expressions should be traversed.
           */
          public boolean visitUnionPath(ExpressionOwner owner, UnionPathIterator path)
          {
                  return true;
          }
  
          /**
           * Visit a step within a location path.
           * @param owner The owner of the expression, to which the expression can
           *              be reset if rewriting takes place.
           * @param step The Step object.
           * @return true if the sub expressions should be traversed.
           */
          public boolean visitStep(ExpressionOwner owner, NodeTest step)
          {
                  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)
          {
                  return true;
          }
  
          /**
           * Visit a binary operation.
           * @param owner The owner of the expression, to which the expression can
           *              be reset if rewriting takes place.
           * @param op The operation object.
           * @return true if the sub expressions should be traversed.
           */
          public boolean visitBinaryOperation(ExpressionOwner owner, Operation op)
          {
                  return true;
          }
  
          /**
           * Visit a unary operation.
           * @param owner The owner of the expression, to which the expression can
           *              be reset if rewriting takes place.
           * @param op The operation object.
           * @return true if the sub expressions should be traversed.
           */
          public boolean visitUnaryOperation(ExpressionOwner owner, UnaryOperation op)
          {
                  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)
          {
                  return true;
          }
  
          /**
           * 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)
          {
                  return true;
          }
  
          /**
           * Visit a match pattern.
           * @param owner The owner of the expression, to which the expression can
           *              be reset if rewriting takes place.
           * @param pattern The match pattern object.
           * @return true if the sub expressions should be traversed.
           */
          public boolean visitMatchPattern(ExpressionOwner owner, StepPattern pattern)
          {
                  return true;
          }
  
          /**
           * Visit a union pattern.
           * @param owner The owner of the expression, to which the expression can
           *              be reset if rewriting takes place.
           * @param pattern The union pattern object.
           * @return true if the sub expressions should be traversed.
           */
          public boolean visitUnionPattern(ExpressionOwner owner, UnionPattern pattern)
          {
                  return true;
          }
  
          /**
           * Visit a string literal.
           * @param owner The owner of the expression, to which the expression can
           *              be reset if rewriting takes place.
           * @param str The string literal object.
           * @return true if the sub expressions should be traversed.
           */
          public boolean visitStringLiteral(ExpressionOwner owner, XString str)
          {
                  return true;
          }
  
  
          /**
           * Visit a number literal.
           * @param owner The owner of the expression, to which the expression can
           *              be reset if rewriting takes place.
           * @param num The number literal object.
           * @return true if the sub expressions should be traversed.
           */
          public boolean visitNumberLiteral(ExpressionOwner owner, XNumber num)
          {
                  return true;
          }
  
  
  }
  