/*
 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
 */
/*
 * 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
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package com.sun.org.apache.xpath.internal.functions;

import com.sun.org.apache.xml.internal.dtm.DTMIterator;
import com.sun.org.apache.xml.internal.utils.QName;
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;
import java.util.List;


Execute the Last() function.
@xsl.usageadvanced
@LastModified: Oct 2017
/** * Execute the Last() function. * @xsl.usage advanced * @LastModified: Oct 2017 */
public class FuncLast extends Function { static final long serialVersionUID = 9205812403085432943L; private boolean m_isTopLevel;
Figure out if we're executing a toplevel expression. If so, we can't be inside of a predicate.
/** * 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.
Params:
  • xctxt – non-null reference to XPath runtime context.
Throws:
Returns:The number of nodes in the list.
/** * Get the position in the current context node list. * * @param xctxt non-null reference to XPath runtime context. * * @return The number of nodes in the list. * * @throws javax.xml.transform.TransformerException */
public int getCountOfContextNodeList(XPathContext xctxt) throws javax.xml.transform.TransformerException { // assert(null != m_contextNodeList, "m_contextNodeList must be non-null"); // If we're in a predicate, then this will return non-null. SubContextList iter = m_isTopLevel ? null : xctxt.getSubContextList(); // System.out.println("iter: "+iter); if (null != iter) return iter.getLastPos(xctxt); DTMIterator cnl = xctxt.getContextNodeList(); int count; if(null != cnl) { count = cnl.getLength(); // System.out.println("count: "+count); } else count = 0; return count; }
Execute the function. The function must return a valid object.
Params:
  • xctxt – The current execution context.
Throws:
Returns:A valid XObject.
/** * 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 { XNumber xnum = new XNumber((double) getCountOfContextNodeList(xctxt)); // System.out.println("last: "+xnum.num()); return xnum; }
No arguments to process, so this does nothing.
/** * No arguments to process, so this does nothing. */
public void fixupVariables(List<QName> vars, int globalsSize) { // no-op } }