- /*
- * Copyright 1999-2004 The Apache Software Foundation.
- *
- * Licensed 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: UnionPattern.java,v 1.13 2004/02/17 04:35:37 minchau Exp $
- */
- package com.sun.org.apache.xpath.internal.patterns;
-
- import com.sun.org.apache.xpath.internal.Expression;
- import com.sun.org.apache.xpath.internal.ExpressionOwner;
- import com.sun.org.apache.xpath.internal.XPathContext;
- import com.sun.org.apache.xpath.internal.XPathVisitor;
- import com.sun.org.apache.xpath.internal.objects.XObject;
-
- /**
- * This class represents a union pattern, which can have multiple individual
- * StepPattern patterns.
- * @xsl.usage advanced
- */
- public class UnionPattern extends Expression
- {
-
- /** 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 com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_NODETEST},
- * {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_NONE},
- * {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_NSWILD},
- * {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_QNAME}, or
- * {@link com.sun.org.apache.xpath.internal.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 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;
-
- }
-
-
- }