| /* ==================================================================== |
| 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.functions; |
| |
| import java.util.Calendar; |
| import java.util.Date; |
| |
| import org.apache.poi.ss.formula.OperationEvaluationContext; |
| import org.apache.poi.ss.formula.eval.BlankEval; |
| import org.apache.poi.ss.formula.eval.ErrorEval; |
| import org.apache.poi.ss.formula.eval.EvaluationException; |
| import org.apache.poi.ss.formula.eval.NumberEval; |
| import org.apache.poi.ss.formula.eval.RefEval; |
| import org.apache.poi.ss.formula.eval.ValueEval; |
| import org.apache.poi.ss.usermodel.DateUtil; |
| import org.apache.poi.util.LocaleUtil; |
| |
| /** |
| * Implementation for Excel EDATE () function. |
| */ |
| public class EDate implements FreeRefFunction { |
| public static final FreeRefFunction instance = new EDate(); |
| |
| public ValueEval evaluate(ValueEval[] args, OperationEvaluationContext ec) { |
| if (args.length != 2) { |
| return ErrorEval.VALUE_INVALID; |
| } |
| try { |
| double startDateAsNumber = getValue(args[0]); |
| int offsetInMonthAsNumber = (int) getValue(args[1]); |
| |
| Date startDate = DateUtil.getJavaDate(startDateAsNumber); |
| if (startDate == null) { |
| return ErrorEval.VALUE_INVALID; |
| } |
| Calendar calendar = LocaleUtil.getLocaleCalendar(); |
| calendar.setTime(startDate); |
| calendar.add(Calendar.MONTH, offsetInMonthAsNumber); |
| return new NumberEval(DateUtil.getExcelDate(calendar.getTime())); |
| } catch (EvaluationException e) { |
| return e.getErrorEval(); |
| } |
| } |
| |
| private double getValue(ValueEval arg) throws EvaluationException { |
| if (arg instanceof NumberEval) { |
| return ((NumberEval) arg).getNumberValue(); |
| } |
| if(arg instanceof BlankEval) { |
| return 0; |
| } |
| if (arg instanceof RefEval) { |
| RefEval refEval = (RefEval)arg; |
| if (refEval.getNumberOfSheets() > 1) { |
| // Multi-Sheet references are not supported |
| throw new EvaluationException(ErrorEval.VALUE_INVALID); |
| } |
| |
| ValueEval innerValueEval = refEval.getInnerValueEval(refEval.getFirstSheetIndex()); |
| if(innerValueEval instanceof NumberEval) { |
| return ((NumberEval) innerValueEval).getNumberValue(); |
| } |
| if(innerValueEval instanceof BlankEval) { |
| return 0; |
| } |
| } |
| throw new EvaluationException(ErrorEval.VALUE_INVALID); |
| } |
| } |