| /* |
| * 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.xpath.patterns; |
| |
| import org.apache.xpath.Expression; |
| import org.apache.xpath.ExpressionOwner; |
| import org.apache.xpath.XPathContext; |
| import org.apache.xpath.XPathVisitor; |
| import org.apache.xpath.objects.XObject; |
| |
| /** |
| * This class represents a union pattern, which can have multiple individual |
| * StepPattern patterns. |
| * @xsl.usage advanced |
| */ |
| public class UnionPattern extends Expression |
| { |
| static final long serialVersionUID = -6670449967116905820L; |
| |
| /** Array of the contained step patterns to be tested. |
| * @serial */ |
| private StepPattern[] m_patterns; |
| |
| /** |
| * No arguments to process, so this does nothing. |
| */ |
| public void fixupVariables(java.util.Vector vars, int globalsSize) |
| { |
| for (int i = 0; i < m_patterns.length; i++) |
| { |
| m_patterns[i].fixupVariables(vars, globalsSize); |
| } |
| } |
| |
| |
| /** |
| * Tell if this expression or it's subexpressions can traverse outside |
| * the current subtree. |
| * |
| * @return true if traversal outside the context node's subtree can occur. |
| */ |
| public boolean canTraverseOutsideSubtree() |
| { |
| if(null != m_patterns) |
| { |
| int n = m_patterns.length; |
| for (int i = 0; i < n; i++) |
| { |
| if(m_patterns[i].canTraverseOutsideSubtree()) |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Set the contained step patterns to be tested. |
| * |
| * |
| * @param patterns the contained step patterns to be tested. |
| */ |
| public void setPatterns(StepPattern[] patterns) |
| { |
| m_patterns = patterns; |
| if(null != patterns) |
| { |
| for(int i = 0; i < patterns.length; i++) |
| { |
| patterns[i].exprSetParent(this); |
| } |
| } |
| |
| } |
| |
| /** |
| * Get the contained step patterns to be tested. |
| * |
| * |
| * @return an array of the contained step patterns to be tested. |
| */ |
| public StepPattern[] getPatterns() |
| { |
| return m_patterns; |
| } |
| |
| /** |
| * Test a node to see if it matches any of the patterns in the union. |
| * |
| * @param xctxt XPath runtime context. |
| * |
| * @return {@link org.apache.xpath.patterns.NodeTest#SCORE_NODETEST}, |
| * {@link org.apache.xpath.patterns.NodeTest#SCORE_NONE}, |
| * {@link org.apache.xpath.patterns.NodeTest#SCORE_NSWILD}, |
| * {@link org.apache.xpath.patterns.NodeTest#SCORE_QNAME}, or |
| * {@link org.apache.xpath.patterns.NodeTest#SCORE_OTHER}. |
| * |
| * @throws javax.xml.transform.TransformerException |
| */ |
| public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException |
| { |
| |
| XObject bestScore = null; |
| int n = m_patterns.length; |
| |
| for (int i = 0; i < n; i++) |
| { |
| XObject score = m_patterns[i].execute(xctxt); |
| |
| if (score != NodeTest.SCORE_NONE) |
| { |
| if (null == bestScore) |
| bestScore = score; |
| else if (score.num() > bestScore.num()) |
| bestScore = score; |
| } |
| } |
| |
| if (null == bestScore) |
| { |
| bestScore = NodeTest.SCORE_NONE; |
| } |
| |
| return bestScore; |
| } |
| |
| class UnionPathPartOwner implements ExpressionOwner |
| { |
| int m_index; |
| |
| UnionPathPartOwner(int index) |
| { |
| m_index = index; |
| } |
| |
| /** |
| * @see ExpressionOwner#getExpression() |
| */ |
| public Expression getExpression() |
| { |
| return m_patterns[m_index]; |
| } |
| |
| |
| /** |
| * @see ExpressionOwner#setExpression(Expression) |
| */ |
| public void setExpression(Expression exp) |
| { |
| exp.exprSetParent(UnionPattern.this); |
| m_patterns[m_index] = (StepPattern)exp; |
| } |
| } |
| |
| /** |
| * @see org.apache.xpath.XPathVisitable#callVisitors(ExpressionOwner, XPathVisitor) |
| */ |
| public void callVisitors(ExpressionOwner owner, XPathVisitor visitor) |
| { |
| visitor.visitUnionPattern(owner, this); |
| if(null != m_patterns) |
| { |
| int n = m_patterns.length; |
| for(int i = 0; i < n; i++) |
| { |
| m_patterns[i].callVisitors(new UnionPathPartOwner(i), visitor); |
| } |
| } |
| } |
| |
| /** |
| * @see Expression#deepEquals(Expression) |
| */ |
| public boolean deepEquals(Expression expr) |
| { |
| if(!isSameClass(expr)) |
| return false; |
| |
| UnionPattern up = (UnionPattern)expr; |
| |
| if(null != m_patterns) |
| { |
| int n = m_patterns.length; |
| if((null == up.m_patterns) || (up.m_patterns.length != n)) |
| return false; |
| |
| for(int i = 0; i < n; i++) |
| { |
| if(!m_patterns[i].deepEquals(up.m_patterns[i])) |
| return false; |
| } |
| } |
| else if(up.m_patterns != null) |
| return false; |
| |
| return true; |
| |
| } |
| |
| |
| } |