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- /* ====================================================================
- 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>)
- */
- 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;
- }
- }
- }
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