- /*
- * The Apache Software License, Version 1.1
- *
- *
- * Copyright (c) 1999 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Xalan" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation and was
- * originally based on software copyright (c) 1999, Lotus
- * Development Corporation., http://www.lotus.com. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
- package org.apache.xpath.patterns;
-
- import java.util.Vector;
-
- import javax.xml.transform.TransformerException;
- import org.apache.xml.dtm.DTM;
- import org.apache.xml.dtm.DTMIterator;
- 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.XNumber;
- import org.apache.xpath.objects.XObject;
- import org.apache.xpath.patterns.StepPattern.PredOwner;
-
- /**
- * <meta name="usage" content="advanced"/>
- * Match pattern step that contains a function.
- */
- public class FunctionPattern extends StepPattern
- {
-
- /**
- * Construct a FunctionPattern from a
- * {@link org.apache.xpath.functions.Function expression}.
- *
- *
- * @param a should be a {@link org.apache.xpath.functions.Function expression}.
- *
- * NEEDSDOC @param expr
- */
- public FunctionPattern(Expression expr, int axis, int predaxis)
- {
-
- super(0, null, null, axis, predaxis);
-
- m_functionExpr = expr;
- }
-
- /**
- * Static calc of match score.
- */
- public final void calcScore()
- {
-
- m_score = SCORE_OTHER;
-
- if (null == m_targetString)
- calcTargetString();
- }
-
- /**
- * Should be a {@link org.apache.xpath.functions.Function expression}.
- * @serial
- */
- Expression m_functionExpr;
-
- /**
- * This function is used to fixup variables from QNames to stack frame
- * indexes at stylesheet build time.
- * @param vars List of QNames that correspond to variables. This list
- * should be searched backwards for the first qualified name that
- * corresponds to the variable reference qname. The position of the
- * QName in the vector from the start of the vector will be its position
- * in the stack frame (but variables above the globalsTop value will need
- * to be offset to the current stack frame).
- */
- public void fixupVariables(java.util.Vector vars, int globalsSize)
- {
- super.fixupVariables(vars, globalsSize);
- m_functionExpr.fixupVariables(vars, globalsSize);
- }
-
-
- /**
- * Test a node to see if it matches the given node test.
- *
- * @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, int context)
- throws javax.xml.transform.TransformerException
- {
-
- DTMIterator nl = m_functionExpr.asIterator(xctxt, context);
- XNumber score = SCORE_NONE;
-
- if (null != nl)
- {
- int n;
-
- while (DTM.NULL != (n = nl.nextNode()))
- {
- score = (n == context) ? SCORE_OTHER : SCORE_NONE;
-
- if (score == SCORE_OTHER)
- {
- context = n;
-
- break;
- }
- }
-
- // nl.detach();
- }
- nl.detach();
-
- return score;
- }
-
- /**
- * Test a node to see if it matches the given node test.
- *
- * @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, int context,
- DTM dtm, int expType)
- throws javax.xml.transform.TransformerException
- {
-
- DTMIterator nl = m_functionExpr.asIterator(xctxt, context);
- XNumber score = SCORE_NONE;
-
- if (null != nl)
- {
- int n;
-
- while (DTM.NULL != (n = nl.nextNode()))
- {
- score = (n == context) ? SCORE_OTHER : SCORE_NONE;
-
- if (score == SCORE_OTHER)
- {
- context = n;
-
- break;
- }
- }
-
- nl.detach();
- }
-
- return score;
- }
-
- /**
- * Test a node to see if it matches the given node test.
- *
- * @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
- {
-
- int context = xctxt.getCurrentNode();
- DTMIterator nl = m_functionExpr.asIterator(xctxt, context);
- XNumber score = SCORE_NONE;
-
- if (null != nl)
- {
- int n;
-
- while (DTM.NULL != (n = nl.nextNode()))
- {
- score = (n == context) ? SCORE_OTHER : SCORE_NONE;
-
- if (score == SCORE_OTHER)
- {
- context = n;
-
- break;
- }
- }
-
- nl.detach();
- }
-
- return score;
- }
-
- class FunctionOwner implements ExpressionOwner
- {
- /**
- * @see ExpressionOwner#getExpression()
- */
- public Expression getExpression()
- {
- return m_functionExpr;
- }
-
-
- /**
- * @see ExpressionOwner#setExpression(Expression)
- */
- public void setExpression(Expression exp)
- {
- exp.exprSetParent(FunctionPattern.this);
- m_functionExpr = exp;
- }
- }
-
- /**
- * Call the visitor for the function.
- */
- protected void callSubtreeVisitors(XPathVisitor visitor)
- {
- m_functionExpr.callVisitors(new FunctionOwner(), visitor);
- super.callSubtreeVisitors(visitor);
- }
-
- }