/*
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* Licensed to the Apache Software Foundation (ASF) Under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for Additional information regarding copyright ownership.
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* The ASF licenses this file to You Under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed Under the License is distributed on an "AS Is" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations Under the License.
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*/
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/*
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* Created on May 15, 2005
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*
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*/
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namespace HH.WMS.Utils.NPOI.SS.Formula.Functions
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{
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using System;
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using HH.WMS.Utils.NPOI.SS.Formula.Eval;
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/**
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* @author Amol S. Deshmukh < amolweb at ya hoo dot com >
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*
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*/
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public class LeftRight : Var1or2ArgFunction
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{
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private static ValueEval DEFAULT_ARG1 = new NumberEval(1.0);
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private bool _isLeft;
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public LeftRight(bool isLeft)
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{
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_isLeft = isLeft;
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}
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public override ValueEval Evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0)
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{
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return Evaluate(srcRowIndex, srcColumnIndex, arg0, DEFAULT_ARG1);
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}
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public override ValueEval Evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0,
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ValueEval arg1)
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{
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String arg;
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int index;
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try
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{
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arg = TextFunction.EvaluateStringArg(arg0, srcRowIndex, srcColumnIndex);
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index = TextFunction.EvaluateIntArg(arg1, srcRowIndex, srcColumnIndex);
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}
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catch (EvaluationException e)
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{
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return e.GetErrorEval();
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}
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if (index < 0)
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{
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return ErrorEval.VALUE_INVALID;
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}
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String result;
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if (_isLeft)
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{
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result = arg.Substring(0, Math.Min(arg.Length, index));
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}
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else
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{
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result = arg.Substring(Math.Max(0, arg.Length - index));
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}
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return new StringEval(result);
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}
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}
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}
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