1/* 2 * reserved comment block 3 * DO NOT REMOVE OR ALTER! 4 */ 5/* 6 * Licensed to the Apache Software Foundation (ASF) under one or more 7 * contributor license agreements. See the NOTICE file distributed with 8 * this work for additional information regarding copyright ownership. 9 * The ASF licenses this file to You under the Apache License, Version 2.0 10 * (the "License"); you may not use this file except in compliance with 11 * the License. You may obtain a copy of the License at 12 * 13 * http://www.apache.org/licenses/LICENSE-2.0 14 * 15 * Unless required by applicable law or agreed to in writing, software 16 * distributed under the License is distributed on an "AS IS" BASIS, 17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 18 * See the License for the specific language governing permissions and 19 * limitations under the License. 20 */ 21 22package com.sun.org.apache.xpath.internal.functions; 23 24import com.sun.org.apache.xalan.internal.res.XSLMessages; 25import com.sun.org.apache.xpath.internal.XPathContext; 26import com.sun.org.apache.xpath.internal.objects.XObject; 27import com.sun.org.apache.xpath.internal.objects.XString; 28 29/** 30 * Execute the Concat() function. 31 * @xsl.usage advanced 32 */ 33public class FuncConcat extends FunctionMultiArgs 34{ 35 static final long serialVersionUID = 1737228885202314413L; 36 37 /** 38 * Execute the function. The function must return 39 * a valid object. 40 * @param xctxt The current execution context. 41 * @return A valid XObject. 42 * 43 * @throws javax.xml.transform.TransformerException 44 */ 45 public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException 46 { 47 48 StringBuffer sb = new StringBuffer(); 49 50 // Compiler says we must have at least two arguments. 51 sb.append(m_arg0.execute(xctxt).str()); 52 sb.append(m_arg1.execute(xctxt).str()); 53 54 if (null != m_arg2) 55 sb.append(m_arg2.execute(xctxt).str()); 56 57 if (null != m_args) 58 { 59 for (int i = 0; i < m_args.length; i++) 60 { 61 sb.append(m_args[i].execute(xctxt).str()); 62 } 63 } 64 65 return new XString(sb.toString()); 66 } 67 68 /** 69 * Check that the number of arguments passed to this function is correct. 70 * 71 * 72 * @param argNum The number of arguments that is being passed to the function. 73 * 74 * @throws WrongNumberArgsException 75 */ 76 public void checkNumberArgs(int argNum) throws WrongNumberArgsException 77 { 78 if (argNum < 2) 79 reportWrongNumberArgs(); 80 } 81 82 /** 83 * Constructs and throws a WrongNumberArgException with the appropriate 84 * message for this function object. 85 * 86 * @throws WrongNumberArgsException 87 */ 88 protected void reportWrongNumberArgs() throws WrongNumberArgsException { 89 throw new WrongNumberArgsException(XSLMessages.createXPATHMessage("gtone", null)); 90 } 91} 92