Frames | No Frames |
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: YearFunction.java 2822 2007-05-20 21:47:52Z mimil $ 28: * ------------ 29: * (C) Copyright 2006-2007, by Pentaho Corporation. 30: */ 31: package org.jfree.formula.function.datetime; 32: 33: import java.util.Calendar; 34: import java.util.Date; 35: 36: import org.jfree.formula.EvaluationException; 37: import org.jfree.formula.FormulaContext; 38: import org.jfree.formula.LibFormulaErrorValue; 39: import org.jfree.formula.function.Function; 40: import org.jfree.formula.function.ParameterCallback; 41: import org.jfree.formula.lvalues.TypeValuePair; 42: import org.jfree.formula.typing.TypeRegistry; 43: import org.jfree.formula.typing.coretypes.NumberType; 44: import org.jfree.formula.util.DateUtil; 45: 46: /** 47: * This function extracts the year from a date. 48: * 49: * @author Cedric Pronzato 50: */ 51: public class YearFunction implements Function 52: { 53: public YearFunction() 54: { 55: } 56: 57: public String getCanonicalName() 58: { 59: return "YEAR"; 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 TypeRegistry typeRegistry = context.getTypeRegistry(); 71: 72: final Date d = typeRegistry.convertToDate(parameters.getType(0), parameters 73: .getValue(0)); 74: 75: if (d == null) 76: { 77: throw new EvaluationException( 78: LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE); 79: } 80: 81: final Calendar gc = DateUtil.createCalendar(d, context 82: .getLocalizationContext()); 83: 84: final int year = gc 85: .get(Calendar.YEAR); 86: return new TypeValuePair(NumberType.GENERIC_NUMBER, new Integer(year)); 87: } 88: }