| /* ==================================================================== |
| 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.eval; |
| |
| import org.apache.poi.ss.formula.functions.Fixed2ArgFunction; |
| import org.apache.poi.ss.formula.functions.Function; |
| |
| /** |
| * @author Amol S. Deshmukh < amolweb at ya hoo dot com > |
| */ |
| public final class ConcatEval extends Fixed2ArgFunction { |
| |
| public static final Function instance = new ConcatEval(); |
| |
| private ConcatEval() { |
| // enforce singleton |
| } |
| |
| public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1) { |
| ValueEval ve0; |
| ValueEval ve1; |
| try { |
| ve0 = OperandResolver.getSingleValue(arg0, srcRowIndex, srcColumnIndex); |
| ve1 = OperandResolver.getSingleValue(arg1, srcRowIndex, srcColumnIndex); |
| } catch (EvaluationException e) { |
| return e.getErrorEval(); |
| } |
| StringBuilder sb = new StringBuilder(); |
| sb.append(getText(ve0)); |
| sb.append(getText(ve1)); |
| return new StringEval(sb.toString()); |
| } |
| |
| private Object getText(ValueEval ve) { |
| if (ve instanceof StringValueEval) { |
| StringValueEval sve = (StringValueEval) ve; |
| return sve.getStringValue(); |
| } |
| if (ve == BlankEval.instance) { |
| return ""; |
| } |
| throw new IllegalAccessError("Unexpected value type (" |
| + ve.getClass().getName() + ")"); |
| } |
| } |