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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.eval;
-
- import org.apache.poi.ss.formula.functions.Fixed2ArgFunction;
- import org.apache.poi.ss.formula.functions.Function;
-
- 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() + ")");
- }
- }
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