- /*
- * 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);
- }
-
- }