- /*
- * 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: FuncPosition.java,v 1.12 2004/02/17 04:34:00 minchau Exp $
- */
- package com.sun.org.apache.xpath.internal.functions;
-
- 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.XPathContext;
- import com.sun.org.apache.xpath.internal.axes.SubContextList;
- import com.sun.org.apache.xpath.internal.compiler.Compiler;
- import com.sun.org.apache.xpath.internal.objects.XNumber;
- import com.sun.org.apache.xpath.internal.objects.XObject;
-
- /**
- * Execute the Position() function.
- * @xsl.usage advanced
- */
- public class FuncPosition extends Function
- {
- private boolean m_isTopLevel;
-
- /**
- * Figure out if we're executing a toplevel expression.
- * If so, we can't be inside of a predicate.
- */
- public void postCompileStep(Compiler compiler)
- {
- m_isTopLevel = compiler.getLocationPathDepth() == -1;
- }
-
- /**
- * Get the position in the current context node list.
- *
- * @param xctxt Runtime XPath context.
- *
- * @return The current position of the itteration in the context node list,
- * or -1 if there is no active context node list.
- */
- public int getPositionInContextNodeList(XPathContext xctxt)
- {
-
- // System.out.println("FuncPosition- entry");
- // If we're in a predicate, then this will return non-null.
- SubContextList iter = m_isTopLevel ? null : xctxt.getSubContextList();
-
- if (null != iter)
- {
- int prox = iter.getProximityPosition(xctxt);
-
- // System.out.println("FuncPosition- prox: "+prox);
- return prox;
- }
-
- DTMIterator cnl = xctxt.getContextNodeList();
-
- if (null != cnl)
- {
- int n = cnl.getCurrentNode();
- if(n == DTM.NULL)
- {
- if(cnl.getCurrentPos() == 0)
- return 0;
-
- // Then I think we're in a sort. See sort21.xsl. So the iterator has
- // already been spent, and is not on the node we're processing.
- // It's highly possible that this is an issue for other context-list
- // functions. Shouldn't be a problem for last(), and it shouldn't be
- // a problem for current().
- try
- {
- cnl = cnl.cloneWithReset();
- }
- catch(CloneNotSupportedException cnse)
- {
- throw new com.sun.org.apache.xml.internal.utils.WrappedRuntimeException(cnse);
- }
- int currentNode = xctxt.getContextNode();
- // System.out.println("currentNode: "+currentNode);
- while(DTM.NULL != (n = cnl.nextNode()))
- {
- if(n == currentNode)
- break;
- }
- }
- // System.out.println("n: "+n);
- // System.out.println("FuncPosition- cnl.getCurrentPos(): "+cnl.getCurrentPos());
- return cnl.getCurrentPos();
- }
-
- // System.out.println("FuncPosition - out of guesses: -1");
- return -1;
- }
-
- /**
- * Execute the function. The function must return
- * a valid object.
- * @param xctxt The current execution context.
- * @return A valid XObject.
- *
- * @throws javax.xml.transform.TransformerException
- */
- public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
- {
- double pos = (double) getPositionInContextNodeList(xctxt);
-
- return new XNumber(pos);
- }
-
- /**
- * No arguments to process, so this does nothing.
- */
- public void fixupVariables(java.util.Vector vars, int globalsSize)
- {
- // no-op
- }
- }