| /* |
| * 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. |
| */ |
| /* |
| * $Id$ |
| */ |
| package org.apache.xalan.templates; |
| |
| import java.util.Vector; |
| |
| import org.apache.xml.utils.QName; |
| import org.apache.xpath.ExpressionOwner; |
| import org.apache.xpath.XPathVisitor; |
| import org.apache.xpath.operations.Variable; |
| |
| /** |
| * This class visits variable refs in an XPath and collects their QNames. |
| */ |
| public class VarNameCollector extends XPathVisitor |
| { |
| Vector m_refs = new Vector(); |
| |
| /** |
| * Reset the list for a fresh visitation and collection. |
| */ |
| public void reset() |
| { |
| m_refs.removeAllElements(); //.clear(); |
| } |
| |
| /** |
| * Get the number of variable references that were collected. |
| * @return the size of the list. |
| */ |
| public int getVarCount() |
| { |
| return m_refs.size(); |
| } |
| |
| /** |
| * Tell if the given qualified name occurs in |
| * the list of qualified names collected. |
| * |
| * @param refName Must be a valid qualified name. |
| * @return true if the list contains the qualified name. |
| */ |
| boolean doesOccur(QName refName) |
| { |
| return m_refs.contains(refName); |
| } |
| |
| /** |
| * 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_refs.addElement(var.getQName()); |
| return true; |
| } |
| |
| } |
| |