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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: SumFunction.java 3186 2007-08-15 16:54:01Z mimil $ 28: * ------------ 29: * (C) Copyright 2006-2007, by Pentaho Corporation. 30: */ 31: package org.jfree.formula.function.math; 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.coretypes.NumberType; 41: import org.jfree.formula.typing.sequence.NumberSequence; 42: import org.jfree.formula.util.NumberUtil; 43: 44: import java.math.BigDecimal; 45: 46: /** 47: * Creation-Date: 31.10.2006, 17:39:19 48: * 49: * @author Thomas Morgner 50: */ 51: public class SumFunction implements Function 52: { 53: public static final BigDecimal ZERO = new BigDecimal(0); 54: 55: public SumFunction() 56: { 57: } 58: 59: public String getCanonicalName() 60: { 61: return "SUM"; 62: } 63: 64: public TypeValuePair evaluate(final FormulaContext context, 65: final ParameterCallback parameters) 66: throws EvaluationException 67: { 68: BigDecimal computedResult = ZERO; 69: final int parameterCount = parameters.getParameterCount(); 70: 71: if (parameterCount == 0) 72: { 73: throw new EvaluationException(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE); 74: } 75: 76: for (int paramIdx = 0; paramIdx < parameterCount; paramIdx++) 77: { 78: final Type type = parameters.getType(paramIdx); 79: final Object value = parameters.getValue(paramIdx); 80: final NumberSequence sequence = context.getTypeRegistry().convertToNumberSequence(type, value); 81: 82: while (sequence.hasNext()) 83: { 84: computedResult = compute(sequence.nextNumber(), computedResult); 85: } 86: } 87: 88: return new TypeValuePair(NumberType.GENERIC_NUMBER, computedResult); 89: } 90: 91: private BigDecimal compute(final Number value, 92: final BigDecimal computedResult) throws EvaluationException 93: { 94: if (value == null) 95: { 96: // no-op .. 97: return computedResult; 98: } 99: 100: return computedResult.add(NumberUtil.getAsBigDecimal(value)); 101: } 102: }