| /* ==================================================================== |
| 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.OperationEvaluationContext; |
| import org.apache.poi.ss.formula.WorkbookEvaluator; |
| import org.apache.poi.ss.formula.eval.ErrorEval; |
| import org.apache.poi.ss.formula.eval.EvaluationException; |
| import org.apache.poi.ss.formula.eval.ValueEval; |
| import org.apache.poi.ss.formula.functions.FreeRefFunction; |
| /** |
| * Implementation of 'Analysis Toolpak' Excel function IFERROR()<br> |
| * |
| * Returns an error text if there is an error in the evaluation<p> |
| * |
| * <b>Syntax</b><br> |
| * <b>IFERROR</b>(<b>expression</b>, <b>string</b>) |
| * |
| * @author Johan Karlsteen |
| */ |
| final class IfError implements FreeRefFunction { |
| |
| public static final FreeRefFunction instance = new IfError(); |
| |
| private IfError() { |
| // enforce singleton |
| } |
| |
| public ValueEval evaluate(ValueEval[] args, OperationEvaluationContext ec) { |
| if (args.length != 2) { |
| return ErrorEval.VALUE_INVALID; |
| } |
| |
| ValueEval val; |
| try { |
| val = evaluateInternal(args[0], args[1], ec.getRowIndex(), ec.getColumnIndex()); |
| } catch (EvaluationException e) { |
| return e.getErrorEval(); |
| } |
| |
| return val; |
| } |
| |
| private static ValueEval evaluateInternal(ValueEval arg, ValueEval iferror, int srcCellRow, int srcCellCol) throws EvaluationException { |
| arg = WorkbookEvaluator.dereferenceResult(arg, srcCellRow, srcCellCol); |
| if(arg instanceof ErrorEval) { |
| return iferror; |
| } else { |
| return arg; |
| } |
| } |
| } |