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: FuncConcat.java 468655 2006-10-28 07:12:06Z minchau $ 20 */ 21 package org.apache.xpath.functions; 22 23 import org.apache.xalan.res.XSLMessages; 24 import org.apache.xpath.XPathContext; 25 import org.apache.xpath.objects.XObject; 26 import org.apache.xpath.objects.XString; 27 28 /** 29 * Execute the Concat() function. 30 * @xsl.usage advanced 31 */ 32 public class FuncConcat extends FunctionMultiArgs 33 { 34 static final long serialVersionUID = 1737228885202314413L; 35 36 /** 37 * Execute the function. The function must return 38 * a valid object. 39 * @param xctxt The current execution context. 40 * @return A valid XObject. 41 * 42 * @throws javax.xml.transform.TransformerException 43 */ execute(XPathContext xctxt)44 public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException 45 { 46 47 StringBuffer sb = new StringBuffer(); 48 49 // Compiler says we must have at least two arguments. 50 sb.append(m_arg0.execute(xctxt).str()); 51 sb.append(m_arg1.execute(xctxt).str()); 52 53 if (null != m_arg2) 54 sb.append(m_arg2.execute(xctxt).str()); 55 56 if (null != m_args) 57 { 58 for (int i = 0; i < m_args.length; i++) 59 { 60 sb.append(m_args[i].execute(xctxt).str()); 61 } 62 } 63 64 return new XString(sb.toString()); 65 } 66 67 /** 68 * Check that the number of arguments passed to this function is correct. 69 * 70 * 71 * @param argNum The number of arguments that is being passed to the function. 72 * 73 * @throws WrongNumberArgsException 74 */ checkNumberArgs(int argNum)75 public void checkNumberArgs(int argNum) throws WrongNumberArgsException 76 { 77 if (argNum < 2) 78 reportWrongNumberArgs(); 79 } 80 81 /** 82 * Constructs and throws a WrongNumberArgException with the appropriate 83 * message for this function object. 84 * 85 * @throws WrongNumberArgsException 86 */ reportWrongNumberArgs()87 protected void reportWrongNumberArgs() throws WrongNumberArgsException { 88 throw new WrongNumberArgsException(XSLMessages.createXPATHMessage("gtone", null)); 89 } 90 } 91