Class NullWrappedLazyLogical
- java.lang.Object
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- com.singularsys.jep.functions.PostfixMathCommand
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- com.singularsys.jep.misc.nullwrapper.functions.NullWrappedLazyLogical
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- All Implemented Interfaces:
CallbackEvaluationI
,NullWrappedFunctionI
,PostfixMathCommandI
,java.io.Serializable
public class NullWrappedLazyLogical extends PostfixMathCommand implements CallbackEvaluationI, NullWrappedFunctionI
Null wrapped versions of the LazyLogical functions. In version 3.5 the convention has been changed to behave like the MySQL logical operators.OR truth table A OR B True False null True True True True False True False null null True null null AND truth table A AND B True False null True True False null False False False False null null False null NOT truth table A NOT A True False False True null null - Since:
- 3.4
- Version:
- 3.5
- Author:
- Richard Morris
- See Also:
LazyLogical
, Serialized Form
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Field Summary
Fields Modifier and Type Field Description protected boolean
allowNumbers
static int
AND
protected int
id
Represents which logical operator this is.static int
OR
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Fields inherited from class com.singularsys.jep.functions.PostfixMathCommand
curNumberOfParameters, name, NaN, numberOfParameters
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Constructor Summary
Constructors Constructor Description NullWrappedLazyLogical(int id_in)
Standard constructor, non zero Numbers will be treated as true and zero Numbers as false.NullWrappedLazyLogical(int id_in, boolean disallowNumbers)
Constructor which restricts type of arguments.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Object
evaluate(Node node, Evaluator pv)
Performs some special evaluation on the node.PostfixMathCommandI
getRoot()
Get to function which this function wraps.-
Methods inherited from class com.singularsys.jep.functions.PostfixMathCommand
asArray, asBool, asDouble, asInt, asLong, asStrictInt, asString, checkNumberOfParameters, getName, getNumberOfParameters, run, setCurNumberOfParameters, setName, toString, toString
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Field Detail
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AND
public static final int AND
- See Also:
- Constant Field Values
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OR
public static final int OR
- See Also:
- Constant Field Values
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id
protected int id
Represents which logical operator this is.
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allowNumbers
protected boolean allowNumbers
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Constructor Detail
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NullWrappedLazyLogical
public NullWrappedLazyLogical(int id_in)
Standard constructor, non zero Numbers will be treated as true and zero Numbers as false.- Parameters:
id_in
- either of the constants AND or OR
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NullWrappedLazyLogical
public NullWrappedLazyLogical(int id_in, boolean disallowNumbers)
Constructor which restricts type of arguments.- Parameters:
id_in
-disallowNumbers
- if true Number arguments will raise exceptions, otherwise as the Standard constructor.
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Method Detail
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getRoot
public PostfixMathCommandI getRoot()
Description copied from interface:NullWrappedFunctionI
Get to function which this function wraps.- Specified by:
getRoot
in interfaceNullWrappedFunctionI
- Returns:
- the root function, may be "this".
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evaluate
public java.lang.Object evaluate(Node node, Evaluator pv) throws EvaluationException
Description copied from interface:CallbackEvaluationI
Performs some special evaluation on the node. This method has the responsibility for evaluating the children of the node and it should generally callpv.eval(node.jjtGetChild(i))
for each child. The SymbolTable is not passed as an argument. This is because it is better practice to get and set variable values by using node.getVar().setValue() rather that through the SymbolTable with requires a hashtable lookup.- Specified by:
evaluate
in interfaceCallbackEvaluationI
- Parameters:
node
- The current nodepv
- The visitor, can be used evaluate the children- Returns:
- the value after evaluation. This value will be passed to other functions higher up the node tree. The value can be any type including Double or Vector<Object>
- Throws:
EvaluationException
- if the calculation cannot be performed- See Also:
Evaluator
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