001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements. See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership. The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the  "License");
007     * you may not use this file except in compliance with the License.
008     * You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    /*
019     * $Id: FuncCount.java 468655 2006-10-28 07:12:06Z minchau $
020     */
021    package org.apache.xpath.functions;
022    
023    import org.apache.xml.dtm.DTMIterator;
024    import org.apache.xpath.XPathContext;
025    import org.apache.xpath.objects.XNumber;
026    import org.apache.xpath.objects.XObject;
027    
028    /**
029     * Execute the Count() function.
030     * @xsl.usage advanced
031     */
032    public class FuncCount extends FunctionOneArg
033    {
034        static final long serialVersionUID = -7116225100474153751L;
035    
036      /**
037       * Execute the function.  The function must return
038       * a valid object.
039       * @param xctxt The current execution context.
040       * @return A valid XObject.
041       *
042       * @throws javax.xml.transform.TransformerException
043       */
044      public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
045      {
046    
047    //    DTMIterator nl = m_arg0.asIterator(xctxt, xctxt.getCurrentNode());
048    
049    //    // We should probably make a function on the iterator for this, 
050    //    // as a given implementation could optimize.
051    //    int i = 0;
052    //
053    //    while (DTM.NULL != nl.nextNode())
054    //    {
055    //      i++;
056    //    }
057    //    nl.detach();
058            DTMIterator nl = m_arg0.asIterator(xctxt, xctxt.getCurrentNode());
059            int i = nl.getLength(); 
060            nl.detach();
061    
062        return new XNumber((double) i);
063      }
064    }