19f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson/* 29f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Licensed to the Apache Software Foundation (ASF) under one 39f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * or more contributor license agreements. See the NOTICE file 49f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * distributed with this work for additional information 59f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * regarding copyright ownership. The ASF licenses this file 69f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * to you under the Apache License, Version 2.0 (the "License"); 79f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * you may not use this file except in compliance with the License. 89f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * You may obtain a copy of the License at 99f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 109f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * http://www.apache.org/licenses/LICENSE-2.0 119f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 129f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Unless required by applicable law or agreed to in writing, software 139f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * distributed under the License is distributed on an "AS IS" BASIS, 149f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 159f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * See the License for the specific language governing permissions and 169f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * limitations under the License. 179f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 189f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson/* 199f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * $Id: AbsPathChecker.java 468643 2006-10-28 06:56:03Z minchau $ 209f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 219f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonpackage org.apache.xalan.templates; 229f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 239f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.ExpressionOwner; 249f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.XPathVisitor; 259f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.axes.LocPathIterator; 269f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.functions.FuncCurrent; 279f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.functions.FuncExtFunction; 289f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.functions.Function; 299f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.operations.Variable; 309f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 319f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson/** 329f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * This class runs over a path expression that is assumed to be absolute, and 339f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * checks for variables and the like that may make it context dependent. 349f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 359f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonpublic class AbsPathChecker extends XPathVisitor 369f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson{ 379f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson private boolean m_isAbs = true; 389f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 399f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 409f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Process the LocPathIterator to see if it contains variables 419f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * or functions that may make it context dependent. 429f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @param path LocPathIterator that is assumed to be absolute, but needs checking. 439f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @return true if the path is confirmed to be absolute, false if it 449f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * may contain context dependencies. 459f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 469f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public boolean checkAbsolute(LocPathIterator path) 479f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 489f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson m_isAbs = true; 499f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson path.callVisitors(null, this); 509f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return m_isAbs; 519f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 529f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 539f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 549f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Visit a function. 559f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @param owner The owner of the expression, to which the expression can 569f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * be reset if rewriting takes place. 579f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @param func The function reference object. 589f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @return true if the sub expressions should be traversed. 599f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 609f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public boolean visitFunction(ExpressionOwner owner, Function func) 619f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 629f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson if((func instanceof FuncCurrent) || 639f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson (func instanceof FuncExtFunction)) 649f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson m_isAbs = false; 659f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return true; 669f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 679f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 689f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 699f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Visit a variable reference. 709f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @param owner The owner of the expression, to which the expression can 719f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * be reset if rewriting takes place. 729f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @param var The variable reference object. 739f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @return true if the sub expressions should be traversed. 749f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 759f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public boolean visitVariableRef(ExpressionOwner owner, Variable var) 769f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 779f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson m_isAbs = false; 789f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return true; 799f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 809f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson} 819f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 82