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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,v 1.10 2007/05/07 23:00:37 mimil Exp $ 28: * ------------ 29: * (C) Copyright 2006-2007, by Pentaho Corporation. 30: */ 31: package org.jfree.formula.function.math; 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.TypeConversionException; 43: import org.jfree.formula.typing.coretypes.NumberType; 44: 45: /** 46: * Creation-Date: 31.10.2006, 17:39:19 47: * 48: * @author Thomas Morgner 49: */ 50: public class SumFunction implements Function 51: { 52: public static final BigDecimal ZERO = new BigDecimal(0); 53: 54: public SumFunction() 55: { 56: } 57: 58: public String getCanonicalName() 59: { 60: return "SUM"; 61: } 62: 63: public TypeValuePair evaluate(final FormulaContext context, 64: final ParameterCallback parameters) 65: throws EvaluationException 66: { 67: BigDecimal computedResult = ZERO; 68: final int parameterCount = parameters.getParameterCount(); 69: 70: if(parameterCount == 0) 71: { 72: throw new EvaluationException(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE); 73: } 74: 75: for (int paramIdx = 0; paramIdx < parameterCount; paramIdx++) 76: { 77: final Object value = parameters.getValue(paramIdx); 78: final Type type = parameters.getType(paramIdx); 79: if (value == null) 80: { 81: continue; 82: } 83: 84: try 85: { 86: final Number n = context.getTypeRegistry().convertToNumber(type, value); 87: computedResult = compute(n, computedResult); 88: } 89: catch(TypeConversionException tce) 90: { 91: // The sum function ignores invalid values .. 92: } 93: } 94: 95: // TODO: Array not yet supported 96: /*final Type type = parameters.getType(paramIdx); 97: if (type.isFlagSet(Type.ARRAY_TYPE) == false) 98: { 99: continue; 100: } 101: if (type.isFlagSet(Type.NUMERIC_TYPE) == false) 102: { 103: continue; 104: } 105: 106: final Object[] values = (Object[]) value; 107: for (int arrayIdx = 0; arrayIdx < values.length; arrayIdx++) 108: { 109: computedResult = compute(values[arrayIdx], computedResult); 110: } 111: }*/ 112: 113: return new TypeValuePair(NumberType.GENERIC_NUMBER, computedResult); 114: } 115: 116: private BigDecimal compute(final Object value, 117: final BigDecimal computedResult) 118: { 119: if (value == null) 120: { 121: // no-op .. 122: return computedResult; 123: } 124: 125: if (value instanceof Number == false) 126: { 127: // Paranoid checks can be disabled later .. 128: throw new IllegalArgumentException(String.valueOf(value)); 129: } 130: 131: if (value instanceof BigDecimal) 132: { 133: return computedResult.add((BigDecimal) value); 134: } 135: else 136: { 137: final Number n = (Number) value; 138: final BigDecimal nval = new BigDecimal(n.toString()); 139: return computedResult.add(nval); 140: } 141: } 142: }