/* ====================================================================
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.hssf.record.formula.functions;
import org.apache.poi.hssf.record.formula.eval.ErrorEval;
import org.apache.poi.hssf.record.formula.eval.RefEval;
import org.apache.poi.hssf.record.formula.eval.StringEval;
import org.apache.poi.hssf.record.formula.eval.ValueEval;
public final class T implements Function {
public ValueEval evaluate(ValueEval[] args, int srcCellRow, short srcCellCol) {
switch (args.length) {
default:
return ErrorEval.VALUE_INVALID;
case 1:
break;
}
ValueEval arg = args[0];
if (arg instanceof RefEval) {
RefEval re = (RefEval) arg;
arg = re.getInnerValueEval();
}
if (arg instanceof StringEval) {
// Text values are returned unmodified
return arg;
}
if (arg instanceof ErrorEval) {
// Error values also returned unmodified
return arg;
}
// for all other argument types the result is empty string
return StringEval.EMPTY_INSTANCE;
}
}