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205 lines
7.8 KiB
205 lines
7.8 KiB
/*
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
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/*
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* Copyright 2002-2004 The Apache Software Foundation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* $Id: XPathVisitor.java,v 1.1.2.1 2005/08/01 01:30:11 jeffsuttor Exp $
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*/
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package com.sun.org.apache.xpath.internal;
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import com.sun.org.apache.xpath.internal.axes.LocPathIterator;
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import com.sun.org.apache.xpath.internal.axes.UnionPathIterator;
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import com.sun.org.apache.xpath.internal.functions.Function;
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import com.sun.org.apache.xpath.internal.objects.XNumber;
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import com.sun.org.apache.xpath.internal.objects.XString;
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import com.sun.org.apache.xpath.internal.operations.Operation;
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import com.sun.org.apache.xpath.internal.operations.UnaryOperation;
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import com.sun.org.apache.xpath.internal.operations.Variable;
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import com.sun.org.apache.xpath.internal.patterns.NodeTest;
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import com.sun.org.apache.xpath.internal.patterns.StepPattern;
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import com.sun.org.apache.xpath.internal.patterns.UnionPattern;
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/**
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* A derivation from this class can be passed to a class that implements
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* the XPathVisitable interface, to have the appropriate method called
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* for each component of the XPath. Aside from possible other uses, the
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* main intention is to provide a reasonable means to perform expression
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* rewriting.
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*
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* <p>Each method has the form
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* <code>boolean visitComponentType(ExpressionOwner owner, ComponentType compType)</code>.
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* The ExpressionOwner argument is the owner of the component, and can
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* be used to reset the expression for rewriting. If a method returns
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* false, the sub hierarchy will not be traversed.</p>
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*
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* <p>This class is meant to be a base class that will be derived by concrete classes,
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* and doesn't much except return true for each method.</p>
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*/
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public class XPathVisitor
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{
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/**
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* Visit a LocationPath.
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* @param owner The owner of the expression, to which the expression can
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* be reset if rewriting takes place.
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* @param path The LocationPath object.
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* @return true if the sub expressions should be traversed.
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*/
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public boolean visitLocationPath(ExpressionOwner owner, LocPathIterator path)
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{
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return true;
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}
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/**
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* Visit a UnionPath.
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* @param owner The owner of the expression, to which the expression can
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* be reset if rewriting takes place.
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* @param path The UnionPath object.
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* @return true if the sub expressions should be traversed.
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*/
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public boolean visitUnionPath(ExpressionOwner owner, UnionPathIterator path)
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{
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return true;
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}
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/**
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* Visit a step within a location path.
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* @param owner The owner of the expression, to which the expression can
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* be reset if rewriting takes place.
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* @param step The Step object.
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* @return true if the sub expressions should be traversed.
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*/
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public boolean visitStep(ExpressionOwner owner, NodeTest step)
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{
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return true;
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}
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/**
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* Visit a predicate within a location path. Note that there isn't a
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* proper unique component for predicates, and that the expression will
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* be called also for whatever type Expression is.
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*
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* @param owner The owner of the expression, to which the expression can
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* be reset if rewriting takes place.
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* @param pred The predicate object.
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* @return true if the sub expressions should be traversed.
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*/
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public boolean visitPredicate(ExpressionOwner owner, Expression pred)
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{
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return true;
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}
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/**
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* Visit a binary operation.
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* @param owner The owner of the expression, to which the expression can
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* be reset if rewriting takes place.
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* @param op The operation object.
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* @return true if the sub expressions should be traversed.
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*/
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public boolean visitBinaryOperation(ExpressionOwner owner, Operation op)
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{
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return true;
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}
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/**
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* Visit a unary operation.
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* @param owner The owner of the expression, to which the expression can
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* be reset if rewriting takes place.
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* @param op The operation object.
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* @return true if the sub expressions should be traversed.
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*/
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public boolean visitUnaryOperation(ExpressionOwner owner, UnaryOperation op)
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{
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return true;
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}
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/**
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* Visit a variable reference.
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* @param owner The owner of the expression, to which the expression can
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* be reset if rewriting takes place.
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* @param var The variable reference object.
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* @return true if the sub expressions should be traversed.
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*/
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public boolean visitVariableRef(ExpressionOwner owner, Variable var)
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{
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return true;
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}
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/**
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* Visit a function.
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* @param owner The owner of the expression, to which the expression can
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* be reset if rewriting takes place.
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* @param func The function reference object.
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* @return true if the sub expressions should be traversed.
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*/
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public boolean visitFunction(ExpressionOwner owner, Function func)
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{
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return true;
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}
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/**
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* Visit a match pattern.
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* @param owner The owner of the expression, to which the expression can
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* be reset if rewriting takes place.
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* @param pattern The match pattern object.
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* @return true if the sub expressions should be traversed.
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*/
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public boolean visitMatchPattern(ExpressionOwner owner, StepPattern pattern)
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{
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return true;
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}
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/**
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* Visit a union pattern.
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* @param owner The owner of the expression, to which the expression can
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* be reset if rewriting takes place.
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* @param pattern The union pattern object.
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* @return true if the sub expressions should be traversed.
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*/
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public boolean visitUnionPattern(ExpressionOwner owner, UnionPattern pattern)
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{
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return true;
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}
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/**
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* Visit a string literal.
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* @param owner The owner of the expression, to which the expression can
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* be reset if rewriting takes place.
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* @param str The string literal object.
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* @return true if the sub expressions should be traversed.
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*/
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public boolean visitStringLiteral(ExpressionOwner owner, XString str)
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{
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return true;
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}
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/**
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* Visit a number literal.
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* @param owner The owner of the expression, to which the expression can
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* be reset if rewriting takes place.
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* @param num The number literal object.
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* @return true if the sub expressions should be traversed.
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*/
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public boolean visitNumberLiteral(ExpressionOwner owner, XNumber num)
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{
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return true;
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}
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}
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