/*
* 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.
*/
/*
* Created on May 22, 2005
*
*/
package org.apache.poi.hssf.record.formula.functions;
import org.apache.poi.hssf.record.formula.eval.AreaEval;
import org.apache.poi.hssf.record.formula.eval.BlankEval;
import org.apache.poi.hssf.record.formula.eval.ErrorEval;
import org.apache.poi.hssf.record.formula.eval.Eval;
import org.apache.poi.hssf.record.formula.eval.RefEval;
import org.apache.poi.hssf.record.formula.eval.StringValueEval;
import org.apache.poi.hssf.record.formula.eval.ValueEval;
/**
* @author Amol S. Deshmukh < amolweb at ya hoo dot com >
*
*/
public abstract class TextFunction implements Function {
protected static final String EMPTY_STRING = "";
protected ValueEval singleOperandEvaluate(Eval eval, int srcRow, short srcCol) {
ValueEval retval;
if (eval instanceof AreaEval) {
AreaEval ae = (AreaEval) eval;
if (ae.contains(srcRow, srcCol)) { // circular ref!
retval = ErrorEval.CIRCULAR_REF_ERROR;
}
else if (ae.isRow()) {
if (ae.containsColumn(srcCol)) {
ValueEval ve = ae.getValueAt(ae.getFirstRow(), srcCol);
retval = attemptXlateToText(ve);
}
else {
retval = ErrorEval.VALUE_INVALID;
}
}
else if (ae.isColumn()) {
if (ae.containsRow(srcRow)) {
ValueEval ve = ae.getValueAt(srcRow, ae.getFirstColumn());
retval = attemptXlateToText(ve);
}
else {
retval = ErrorEval.VALUE_INVALID;
}
}
else {
retval = ErrorEval.VALUE_INVALID;
}
}
else {
retval = attemptXlateToText((ValueEval) eval);
}
return retval;
}
/**
* converts from Different ValueEval types to StringEval.
* Note: AreaEvals are not handled, if arg is an AreaEval,
* the returned value is ErrorEval.VALUE_INVALID
* @param ve
* @return
*/
protected ValueEval attemptXlateToText(ValueEval ve) {
ValueEval retval;
if (ve instanceof StringValueEval) {
retval = ve;
}
else if (ve instanceof RefEval) {
RefEval re = (RefEval) ve;
ValueEval ive = re.getInnerValueEval();
if (ive instanceof StringValueEval) {
retval = ive;
}
else if (ive instanceof BlankEval) {
retval = ive;
}
else {
retval = ErrorEval.VALUE_INVALID;
}
}
else if (ve instanceof BlankEval) {
retval = ve;
}
else {
retval = ErrorEval.VALUE_INVALID;
}
return retval;
}
}