| /* |
| * 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. |
| */ |
| /* |
| * $Id: AbsPathChecker.java 468643 2006-10-28 06:56:03Z minchau $ |
| */ |
| package org.apache.xalan.templates; |
| |
| import org.apache.xpath.ExpressionOwner; |
| import org.apache.xpath.XPathVisitor; |
| import org.apache.xpath.axes.LocPathIterator; |
| import org.apache.xpath.functions.FuncCurrent; |
| import org.apache.xpath.functions.FuncExtFunction; |
| import org.apache.xpath.functions.Function; |
| import org.apache.xpath.operations.Variable; |
| |
| /** |
| * This class runs over a path expression that is assumed to be absolute, and |
| * checks for variables and the like that may make it context dependent. |
| */ |
| public class AbsPathChecker extends XPathVisitor |
| { |
| private boolean m_isAbs = true; |
| |
| /** |
| * 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 boolean checkAbsolute(LocPathIterator path) |
| { |
| m_isAbs = true; |
| path.callVisitors(null, this); |
| return m_isAbs; |
| } |
| |
| /** |
| * 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 FuncCurrent) || |
| (func instanceof FuncExtFunction)) |
| m_isAbs = false; |
| 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_isAbs = false; |
| return true; |
| } |
| } |
| |