| /* |
| * 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: FunctionPattern.java 468655 2006-10-28 07:12:06Z minchau $ |
| */ |
| package org.apache.xpath.patterns; |
| |
| 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; |
| |
| /** |
| * Match pattern step that contains a function. |
| * @xsl.usage advanced |
| */ |
| public class FunctionPattern extends StepPattern |
| { |
| static final long serialVersionUID = -5426793413091209944L; |
| |
| /** |
| * Construct a FunctionPattern from 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); |
| } |
| |
| } |