/*
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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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namespace HH.WMS.Utils.NPOI.SS.Formula.Eval
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{
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using System;
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using System.Text;
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using HH.WMS.Utils.NPOI.SS.Formula;
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using HH.WMS.Utils.NPOI.SS.Formula.Functions;
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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 ConcatEval : Fixed2ArgFunction
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{
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public static Function instance = new ConcatEval();
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private ConcatEval()
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{
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// enforce singleton
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}
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public override ValueEval Evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1)
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{
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ValueEval ve0;
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ValueEval ve1;
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try
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{
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ve0 = OperandResolver.GetSingleValue(arg0, srcRowIndex, srcColumnIndex);
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ve1 = OperandResolver.GetSingleValue(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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StringBuilder sb = new StringBuilder();
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sb.Append(GetText(ve0));
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sb.Append(GetText(ve1));
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return new StringEval(sb.ToString());
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}
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private Object GetText(ValueEval ve)
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{
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if (ve is StringValueEval)
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{
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StringValueEval sve = (StringValueEval)ve;
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return sve.StringValue;
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}
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if (ve == BlankEval.instance)
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{
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return "";
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}
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throw new InvalidOperationException("Unexpected value type ("
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+ ve.GetType().Name + ")");
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}
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}
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}
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