/*
* 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: FunctionPattern.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.xml.internal.dtm.DTM;
import com.sun.org.apache.xml.internal.dtm.DTMIterator;
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.XNumber;
import com.sun.org.apache.xpath.internal.objects.XObject;
/**
* Match pattern step that contains a function.
* @xsl.usage advanced
*/
public class FunctionPattern extends StepPattern
{
/**
* Construct a FunctionPattern from a
* {@link com.sun.org.apache.xpath.internal.functions.Function expression}.
*
*
* @param a should be a {@link com.sun.org.apache.xpath.internal.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 com.sun.org.apache.xpath.internal.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 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, 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 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, 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 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
{
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);
}
}
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