1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 /* 19 * $Id: FuncSum.java 468655 2006-10-28 07:12:06Z minchau $ 20 */ 21 package org.apache.xpath.functions; 22 23 import org.apache.xml.dtm.DTM; 24 import org.apache.xml.dtm.DTMIterator; 25 import org.apache.xml.utils.XMLString; 26 import org.apache.xpath.XPathContext; 27 import org.apache.xpath.objects.XNumber; 28 import org.apache.xpath.objects.XObject; 29 30 /** 31 * Execute the Sum() function. 32 * @xsl.usage advanced 33 */ 34 public class FuncSum extends FunctionOneArg 35 { 36 static final long serialVersionUID = -2719049259574677519L; 37 38 /** 39 * Execute the function. The function must return 40 * a valid object. 41 * @param xctxt The current execution context. 42 * @return A valid XObject. 43 * 44 * @throws javax.xml.transform.TransformerException 45 */ execute(XPathContext xctxt)46 public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException 47 { 48 49 DTMIterator nodes = m_arg0.asIterator(xctxt, xctxt.getCurrentNode()); 50 double sum = 0.0; 51 int pos; 52 53 while (DTM.NULL != (pos = nodes.nextNode())) 54 { 55 DTM dtm = nodes.getDTM(pos); 56 XMLString s = dtm.getStringValue(pos); 57 58 if (null != s) 59 sum += s.toDouble(); 60 } 61 nodes.detach(); 62 63 return new XNumber(sum); 64 } 65 } 66