/*
* 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 8, 2005
*
*/
package org.apache.poi.hssf.record.formula.eval;
import org.apache.poi.hssf.record.formula.Ptg;
import org.apache.poi.hssf.record.formula.UnaryMinusPtg;
/**
* @author Amol S. Deshmukh < amolweb at ya hoo dot com >
*
*/
public class UnaryMinusEval extends NumericOperationEval {
private UnaryMinusPtg delegate;
private static final ValueEvalToNumericXlator NUM_XLATOR =
new ValueEvalToNumericXlator((short)
( ValueEvalToNumericXlator.BOOL_IS_PARSED
| ValueEvalToNumericXlator.EVALUATED_REF_BOOL_IS_PARSED
| ValueEvalToNumericXlator.EVALUATED_REF_STRING_IS_PARSED
| ValueEvalToNumericXlator.REF_BOOL_IS_PARSED
| ValueEvalToNumericXlator.STRING_IS_PARSED
| ValueEvalToNumericXlator.REF_STRING_IS_PARSED
));
public UnaryMinusEval(Ptg ptg) {
this.delegate = (UnaryMinusPtg) ptg;
}
protected ValueEvalToNumericXlator getXlator() {
return NUM_XLATOR;
}
public Eval evaluate(Eval[] operands, int srcRow, short srcCol) {
ValueEval retval = null;
double d = 0;
switch (operands.length) {
default:
retval = ErrorEval.UNKNOWN_ERROR;
break;
case 1:
ValueEval ve = singleOperandEvaluate(operands[0], srcRow, srcCol);
if (ve instanceof NumericValueEval) {
d = ((NumericValueEval) ve).getNumberValue();
}
else if (ve instanceof BlankEval) {
// do nothing
}
else if (ve instanceof ErrorEval) {
retval = ve;
}
}
if (retval == null) {
retval = new NumberEval(-d);
}
return retval;
}
public int getNumberOfOperands() {
return delegate.getNumberOfOperands();
}
public int getType() {
return delegate.getType();
}
}
|