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137 lines
4.2 KiB
137 lines
4.2 KiB
/*
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
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/*
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* Copyright 1999-2004 The Apache Software Foundation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* $Id: FuncPosition.java,v 1.2.4.1 2005/09/14 20:18:45 jeffsuttor Exp $
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*/
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package com.sun.org.apache.xpath.internal.functions;
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import com.sun.org.apache.xml.internal.dtm.DTM;
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import com.sun.org.apache.xml.internal.dtm.DTMIterator;
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import com.sun.org.apache.xpath.internal.XPathContext;
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import com.sun.org.apache.xpath.internal.axes.SubContextList;
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import com.sun.org.apache.xpath.internal.compiler.Compiler;
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import com.sun.org.apache.xpath.internal.objects.XNumber;
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import com.sun.org.apache.xpath.internal.objects.XObject;
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/**
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* Execute the Position() function.
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* @xsl.usage advanced
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*/
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public class FuncPosition extends Function
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{
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static final long serialVersionUID = -9092846348197271582L;
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private boolean m_isTopLevel;
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/**
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* Figure out if we're executing a toplevel expression.
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* If so, we can't be inside of a predicate.
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*/
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public void postCompileStep(Compiler compiler)
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{
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m_isTopLevel = compiler.getLocationPathDepth() == -1;
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}
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/**
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* Get the position in the current context node list.
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*
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* @param xctxt Runtime XPath context.
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*
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* @return The current position of the itteration in the context node list,
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* or -1 if there is no active context node list.
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*/
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public int getPositionInContextNodeList(XPathContext xctxt)
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{
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// System.out.println("FuncPosition- entry");
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// If we're in a predicate, then this will return non-null.
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SubContextList iter = m_isTopLevel ? null : xctxt.getSubContextList();
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if (null != iter)
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{
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int prox = iter.getProximityPosition(xctxt);
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// System.out.println("FuncPosition- prox: "+prox);
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return prox;
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}
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DTMIterator cnl = xctxt.getContextNodeList();
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if (null != cnl)
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{
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int n = cnl.getCurrentNode();
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if(n == DTM.NULL)
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{
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if(cnl.getCurrentPos() == 0)
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return 0;
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// Then I think we're in a sort. See sort21.xsl. So the iterator has
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// already been spent, and is not on the node we're processing.
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// It's highly possible that this is an issue for other context-list
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// functions. Shouldn't be a problem for last(), and it shouldn't be
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// a problem for current().
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try
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{
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cnl = cnl.cloneWithReset();
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}
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catch(CloneNotSupportedException cnse)
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{
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throw new com.sun.org.apache.xml.internal.utils.WrappedRuntimeException(cnse);
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}
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int currentNode = xctxt.getContextNode();
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// System.out.println("currentNode: "+currentNode);
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while(DTM.NULL != (n = cnl.nextNode()))
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{
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if(n == currentNode)
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break;
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}
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}
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// System.out.println("n: "+n);
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// System.out.println("FuncPosition- cnl.getCurrentPos(): "+cnl.getCurrentPos());
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return cnl.getCurrentPos();
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}
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// System.out.println("FuncPosition - out of guesses: -1");
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return -1;
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}
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/**
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* Execute the function. The function must return
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* a valid object.
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* @param xctxt The current execution context.
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* @return A valid XObject.
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*
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* @throws javax.xml.transform.TransformerException
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*/
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public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
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{
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double pos = (double) getPositionInContextNodeList(xctxt);
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return new XNumber(pos);
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}
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/**
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* No arguments to process, so this does nothing.
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*/
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public void fixupVariables(java.util.Vector vars, int globalsSize)
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{
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// no-op
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}
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}
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