101 lines
3.4 KiB
Java
101 lines
3.4 KiB
Java
/*
|
|
* 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 15, 2005
|
|
*
|
|
*/
|
|
package org.apache.poi.hssf.record.formula.functions;
|
|
|
|
import org.apache.poi.hssf.record.formula.eval.BlankEval;
|
|
import org.apache.poi.hssf.record.formula.eval.BoolEval;
|
|
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.NumericValueEval;
|
|
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;
|
|
|
|
|
|
/**
|
|
* @author Amol S. Deshmukh < amolweb at ya hoo dot com >
|
|
* Here are the general rules concerning Boolean functions:
|
|
* <ol>
|
|
* <li> Blanks are not either true or false
|
|
* <li> Strings are not either true or false (even strings "true"
|
|
* or "TRUE" or "0" etc.)
|
|
* <li> Numbers: 0 is false. Any other number is TRUE.
|
|
* <li> References are evaluated and above rules apply.
|
|
* <li> Areas: Individual cells in area are evaluated and checked to
|
|
* see if they are blanks, strings etc.
|
|
* </ol>
|
|
*/
|
|
public abstract class BooleanFunction implements Function {
|
|
|
|
protected ValueEval singleOperandEvaluate(Eval eval, int srcRow, short srcCol, boolean stringsAreBlanks) {
|
|
ValueEval retval;
|
|
|
|
if (eval instanceof RefEval) {
|
|
RefEval re = (RefEval) eval;
|
|
ValueEval ve = re.getInnerValueEval();
|
|
retval = internalResolve(ve, true);
|
|
}
|
|
else {
|
|
retval = internalResolve(eval, stringsAreBlanks);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
private ValueEval internalResolve(Eval ve, boolean stringsAreBlanks) {
|
|
ValueEval retval = null;
|
|
|
|
// blankeval is returned as is
|
|
if (ve instanceof BlankEval) {
|
|
retval = BlankEval.INSTANCE;
|
|
}
|
|
|
|
// stringeval
|
|
else if (ve instanceof StringEval) {
|
|
retval = stringsAreBlanks ? (ValueEval) BlankEval.INSTANCE : (StringEval) ve;
|
|
}
|
|
|
|
// bools are bools :)
|
|
else if (ve instanceof BoolEval) {
|
|
retval = (BoolEval) ve;
|
|
}
|
|
|
|
// convert numbers to bool
|
|
else if (ve instanceof NumericValueEval) {
|
|
NumericValueEval ne = (NumericValueEval) ve;
|
|
double d = ne.getNumberValue();
|
|
retval = Double.isNaN(d)
|
|
? (ValueEval) ErrorEval.VALUE_INVALID
|
|
: (d != 0)
|
|
? BoolEval.TRUE
|
|
: BoolEval.FALSE;
|
|
}
|
|
|
|
// since refevals
|
|
else {
|
|
retval = ErrorEval.VALUE_INVALID;
|
|
}
|
|
|
|
return retval;
|
|
|
|
}
|
|
}
|