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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: IntFunction.java,v 1.5 2007/05/20 21:47:52 mimil Exp $ 28: * ------------ 29: * (C) Copyright 2006-2007, by Pentaho Corporation. 30: */ 31: package org.jfree.formula.function.rounding; 32: 33: import java.math.BigDecimal; 34: 35: import org.jfree.formula.EvaluationException; 36: import org.jfree.formula.FormulaContext; 37: import org.jfree.formula.LibFormulaErrorValue; 38: import org.jfree.formula.function.Function; 39: import org.jfree.formula.function.ParameterCallback; 40: import org.jfree.formula.lvalues.TypeValuePair; 41: import org.jfree.formula.typing.Type; 42: import org.jfree.formula.typing.coretypes.NumberType; 43: import org.jfree.formula.util.NumberUtil; 44: 45: /** 46: * This function returns a number down to the nearest integer. 47: * 48: * @author Cedric Pronzato 49: */ 50: public class IntFunction implements Function 51: { 52: 53: public IntFunction() 54: { 55: } 56: 57: public String getCanonicalName() 58: { 59: return "INT"; 60: } 61: 62: public TypeValuePair evaluate(final FormulaContext context, 63: final ParameterCallback parameters) throws EvaluationException 64: { 65: if (parameters.getParameterCount() != 1) 66: { 67: throw new EvaluationException(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE); 68: } 69: 70: final Type type1 = parameters.getType(0); 71: final Object value1 = parameters.getValue(0); 72: final Number result = context.getTypeRegistry().convertToNumber(type1, 73: value1); 74: 75: BigDecimal n = null; 76: if (result instanceof BigDecimal) 77: { 78: n = (BigDecimal) result; 79: } 80: else 81: { 82: n = new BigDecimal(result.toString()); 83: } 84: Integer ret = NumberUtil.performIntRounding(n); 85: 86: return new TypeValuePair(NumberType.GENERIC_NUMBER, ret); 87: } 88: 89: }