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1: /** 2: * ========================================= 3: * LibFormula : a free Java formula library 4: * ========================================= 5: * 6: * Project Info: http://reporting.pentaho.org/libformula/ 7: * 8: * (C) Copyright 2006-2007, by Pentaho Corporation and Contributors. 9: * 10: * This library is free software; you can redistribute it and/or modify it under the terms 11: * of the GNU Lesser General Public License as published by the Free Software Foundation; 12: * either version 2.1 of the License, or (at your option) any later version. 13: * 14: * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 15: * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 16: * See the GNU Lesser General Public License for more details. 17: * 18: * You should have received a copy of the GNU Lesser General Public License along with this 19: * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, 20: * Boston, MA 02111-1307, USA. 21: * 22: * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 23: * in the United States and other countries.] 24: * 25: * 26: * ------------ 27: * $Id: ReptFunction.java 2752 2007-04-10 14:10:41Z taqua $ 28: * ------------ 29: * (C) Copyright 2006-2007, by Pentaho Corporation. 30: */ 31: package org.jfree.formula.function.text; 32: 33: import org.jfree.formula.EvaluationException; 34: import org.jfree.formula.FormulaContext; 35: import org.jfree.formula.LibFormulaErrorValue; 36: import org.jfree.formula.function.Function; 37: import org.jfree.formula.function.ParameterCallback; 38: import org.jfree.formula.lvalues.TypeValuePair; 39: import org.jfree.formula.typing.Type; 40: import org.jfree.formula.typing.TypeRegistry; 41: import org.jfree.formula.typing.coretypes.TextType; 42: 43: /** 44: * This function returns text repeated Count times. 45: * 46: * @author Cedric Pronzato 47: * 48: */ 49: public class ReptFunction implements Function 50: { 51: public ReptFunction() 52: { 53: } 54: 55: public TypeValuePair evaluate(final FormulaContext context, 56: final ParameterCallback parameters) throws EvaluationException 57: { 58: final int parameterCount = parameters.getParameterCount(); 59: if (parameterCount != 2) 60: { 61: throw new EvaluationException(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE); 62: } 63: final TypeRegistry typeRegistry = context.getTypeRegistry(); 64: 65: final Type textType1 = parameters.getType(0); 66: final Object textValue1 = parameters.getValue(0); 67: final Type countType = parameters.getType(1); 68: final Object countValue = parameters.getValue(1); 69: 70: final String text1 = typeRegistry.convertToText(textType1, textValue1); 71: final int count = typeRegistry.convertToNumber(countType, countValue).intValue(); 72: if(text1 == null && count >= 0) 73: { 74: throw new EvaluationException(LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE); 75: } 76: 77: final StringBuffer buffer = new StringBuffer(); 78: for(int i=0; i<count; i++) 79: { 80: buffer.append(text1); 81: } 82: return new TypeValuePair(TextType.TYPE, buffer.toString()); 83: } 84: 85: public String getCanonicalName() 86: { 87: return "REPT"; 88: } 89: