| /* ==================================================================== |
| Licensed to the Apache Software Foundation (ASF) under one or more |
| contributor license agreements. See the NOTICE file distributed with |
| this work for additional information regarding copyright ownership. |
| The ASF licenses this file to You under the Apache License, Version 2.0 |
| (the "License"); you may not use this file except in compliance with |
| the License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| ==================================================================== */ |
| |
| package org.apache.poi.ss.formula.atp; |
| |
| import org.apache.poi.ss.formula.eval.BoolEval; |
| import org.apache.poi.ss.formula.eval.ErrorEval; |
| import org.apache.poi.ss.formula.eval.EvaluationException; |
| import org.apache.poi.ss.formula.eval.OperandResolver; |
| import org.apache.poi.ss.formula.eval.ValueEval; |
| import org.apache.poi.ss.formula.functions.FreeRefFunction; |
| import org.apache.poi.ss.formula.OperationEvaluationContext; |
| /** |
| * Implementation of Excel 'Analysis ToolPak' function ISEVEN() ISODD()<br/> |
| * |
| * @author Josh Micich |
| */ |
| final class ParityFunction implements FreeRefFunction { |
| |
| public static final FreeRefFunction IS_EVEN = new ParityFunction(0); |
| public static final FreeRefFunction IS_ODD = new ParityFunction(1); |
| private final int _desiredParity; |
| |
| private ParityFunction(int desiredParity) { |
| _desiredParity = desiredParity; |
| } |
| |
| public ValueEval evaluate(ValueEval[] args, OperationEvaluationContext ec) { |
| if (args.length != 1) { |
| return ErrorEval.VALUE_INVALID; |
| } |
| |
| int val; |
| try { |
| val = evaluateArgParity(args[0], ec.getRowIndex(), ec.getColumnIndex()); |
| } catch (EvaluationException e) { |
| return e.getErrorEval(); |
| } |
| |
| return BoolEval.valueOf(val == _desiredParity); |
| } |
| |
| private static int evaluateArgParity(ValueEval arg, int srcCellRow, int srcCellCol) throws EvaluationException { |
| ValueEval ve = OperandResolver.getSingleValue(arg, srcCellRow, (short)srcCellCol); |
| |
| double d = OperandResolver.coerceValueToDouble(ve); |
| if (d < 0) { |
| d = -d; |
| } |
| long v = (long) Math.floor(d); |
| return (int) (v & 0x0001); |
| } |
| } |