org.apache.poi.hssf.record.formula.eval
Class RelationalOperationEval
java.lang.Object
org.apache.poi.hssf.record.formula.eval.RelationalOperationEval
- All Implemented Interfaces:
- Eval, OperationEval
- Direct Known Subclasses:
- EqualEval, GreaterEqualEval, GreaterThanEval, LessEqualEval, LessThanEval, NotEqualEval
public abstract class RelationalOperationEval
- extends java.lang.Object
- implements OperationEval
Base class for all comparison operator evaluators
- Author:
- Amol S. Deshmukh < amolweb at ya hoo dot com >
Method Summary |
protected abstract boolean |
convertComparisonResult(int cmpResult)
Converts a standard compare result (-1, 0, 1) to true or false
according to subclass' comparison type. |
Eval |
evaluate(Eval[] operands,
int srcRow,
short srcCol)
This is a description of how the relational operators apply in MS Excel. |
int |
getNumberOfOperands()
|
int |
getType()
|
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
RelationalOperationEval
public RelationalOperationEval()
convertComparisonResult
protected abstract boolean convertComparisonResult(int cmpResult)
- Converts a standard compare result (-1, 0, 1) to
true
or false
according to subclass' comparison type.
evaluate
public final Eval evaluate(Eval[] operands,
int srcRow,
short srcCol)
- This is a description of how the relational operators apply in MS Excel.
Use this as a guideline when testing/implementing the evaluate methods
for the relational operators Evals.
Bool.TRUE > any number.
Bool > any string. ALWAYS
Bool.TRUE > Bool.FALSE
Bool.FALSE == Blank
Strings are never converted to numbers or booleans
String > any number. ALWAYS
Non-empty String > Blank
Empty String == Blank
String are sorted dictionary wise
Blank > Negative numbers
Blank == 0
Blank < Positive numbers
- Specified by:
evaluate
in interface OperationEval
getNumberOfOperands
public final int getNumberOfOperands()
- Specified by:
getNumberOfOperands
in interface OperationEval
getType
public final int getType()
- Specified by:
getType
in interface OperationEval
Copyright 2008 The Apache Software Foundation or
its licensors, as applicable.