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: VarNameCollector.java 468643 2006-10-28 06:56:03Z minchau $ 209f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 219f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonpackage org.apache.xalan.templates; 229f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 239f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport java.util.Vector; 249f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 259f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xml.utils.QName; 269f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.ExpressionOwner; 279f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.XPathVisitor; 289f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.operations.Variable; 299f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 309f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson/** 319f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * This class visits variable refs in an XPath and collects their QNames. 329f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 339f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonpublic class VarNameCollector extends XPathVisitor 349f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson{ 359f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson Vector m_refs = new Vector(); 369f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 379f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 389f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Reset the list for a fresh visitation and collection. 399f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 409f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public void reset() 419f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 429f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson m_refs.removeAllElements(); //.clear(); 439f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 449f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 459f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 469f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Get the number of variable references that were collected. 479f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @return the size of the list. 489f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 499f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public int getVarCount() 509f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 519f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return m_refs.size(); 529f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 539f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 549f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 559f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Tell if the given qualified name occurs in 569f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * the list of qualified names collected. 579f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 589f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @param refName Must be a valid qualified name. 599f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @return true if the list contains the qualified name. 609f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 619f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson boolean doesOccur(QName refName) 629f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 639f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return m_refs.contains(refName); 649f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 659f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 669f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 679f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Visit a variable reference. 689f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @param owner The owner of the expression, to which the expression can 699f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * be reset if rewriting takes place. 709f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @param var The variable reference object. 719f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @return true if the sub expressions should be traversed. 729f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 739f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public boolean visitVariableRef(ExpressionOwner owner, Variable var) 749f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 759f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson m_refs.addElement(var.getQName()); 769f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return true; 779f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 789f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 799f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson} 809f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 81