19f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson/* 29f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Licensed to the Apache Software Foundation (ASF) under one 39f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * or more contributor license agreements. See the NOTICE file 49f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * distributed with this work for additional information 59f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * regarding copyright ownership. The ASF licenses this file 69f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * to you under the Apache License, Version 2.0 (the "License"); 79f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * you may not use this file except in compliance with the License. 89f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * You may obtain a copy of the License at 99f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 109f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * http://www.apache.org/licenses/LICENSE-2.0 119f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 129f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Unless required by applicable law or agreed to in writing, software 139f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * distributed under the License is distributed on an "AS IS" BASIS, 149f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 159f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * See the License for the specific language governing permissions and 169f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * limitations under the License. 179f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 189f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson/* 199f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * $Id: FuncCount.java 468655 2006-10-28 07:12:06Z minchau $ 209f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 219f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonpackage org.apache.xpath.functions; 229f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 239f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xml.dtm.DTMIterator; 249f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.XPathContext; 259f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.objects.XNumber; 269f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.objects.XObject; 279f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 289f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson/** 299f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Execute the Count() function. 309f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @xsl.usage advanced 319f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 329f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonpublic class FuncCount extends FunctionOneArg 339f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson{ 349f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson static final long serialVersionUID = -7116225100474153751L; 359f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 369f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 379f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Execute the function. The function must return 389f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * a valid object. 399f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @param xctxt The current execution context. 409f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @return A valid XObject. 419f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 429f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @throws javax.xml.transform.TransformerException 439f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 449f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException 459f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 469f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 479f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson// DTMIterator nl = m_arg0.asIterator(xctxt, xctxt.getCurrentNode()); 489f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 499f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson// // We should probably make a function on the iterator for this, 509f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson// // as a given implementation could optimize. 519f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson// int i = 0; 529f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson// 539f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson// while (DTM.NULL != nl.nextNode()) 549f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson// { 559f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson// i++; 569f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson// } 579f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson// nl.detach(); 589f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson DTMIterator nl = m_arg0.asIterator(xctxt, xctxt.getCurrentNode()); 599f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson int i = nl.getLength(); 609f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson nl.detach(); 619f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 629f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return new XNumber((double) i); 639f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 649f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson} 65