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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: RightFunction.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 a selected number of text characters from the right.<br/> 45: * This function depends on <code>MidFunction</code>. 46: * 47: * @see MidFunction 48: * 49: * @author Cedric Pronzato 50: * 51: */ 52: public class RightFunction implements Function 53: { 54: public RightFunction() 55: { 56: } 57: 58: public TypeValuePair evaluate(final FormulaContext context, 59: final ParameterCallback parameters) throws EvaluationException 60: { 61: final int parameterCount = parameters.getParameterCount(); 62: if (parameterCount < 1 || parameterCount > 2) 63: { 64: throw new EvaluationException(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE); 65: } 66: final TypeRegistry typeRegistry = context.getTypeRegistry(); 67: 68: final Type textType = parameters.getType(0); 69: final Object textValue = parameters.getValue(0); 70: 71: final String text = typeRegistry.convertToText(textType, textValue); 72: final int length; 73: if(parameterCount == 2) 74: { 75: final Number lengthVal = typeRegistry.convertToNumber(parameters.getType(1), parameters.getValue(1)); 76: if (lengthVal.doubleValue() < 0) 77: { 78: throw new EvaluationException(LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE); 79: } 80: length = lengthVal.intValue(); 81: } 82: else 83: { 84: length = 1; 85: } 86: 87: if(text == null || length < 0) 88: { 89: throw new EvaluationException(LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE); 90: } 91: 92: int s = text.length()-length +1; 93: if(s < 1) 94: { 95: s = 1; 96: } 97: final MidFunction function = new MidFunction(); 98: return new TypeValuePair(TextType.TYPE, function.process(text, new Integer(s), new Integer(length))); 99: } 100: 101: public String getCanonicalName() 102: { 103: return "RIGHT"; 104: } 105: