Class NullWrappedIf
- java.lang.Object
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- com.singularsys.jep.functions.PostfixMathCommand
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- com.singularsys.jep.functions.If
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- com.singularsys.jep.misc.nullwrapper.functions.NullWrappedIf
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- All Implemented Interfaces:
CallbackEvaluationI
,NullWrappedFunctionI
,PostfixMathCommandI
,java.io.Serializable
public class NullWrappedIf extends If implements NullWrappedFunctionI
NullWrapped version of the if function. If the first argument is null then null is returned otherwise results are the same as the standard if function.- Since:
- 3.4
- Author:
- Richard Morris
- See Also:
If
, Serialized Form
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Field Summary
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Fields inherited from class com.singularsys.jep.functions.If
falseValue
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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 NullWrappedIf()
NullWrappedIf(java.lang.Object falseValue)
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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.If
checkNumberOfParameters, getFalseValue
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Methods inherited from class com.singularsys.jep.functions.PostfixMathCommand
asArray, asBool, asDouble, asInt, asLong, asStrictInt, asString, getName, getNumberOfParameters, run, setCurNumberOfParameters, setName, toString, toString
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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
- Overrides:
evaluate
in classIf
- 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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