Class DefaultFunctionFactory.IsNullFunction
- java.lang.Object
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- com.inductiveautomation.ignition.common.expressions.functions.BaseFunction
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- com.inductiveautomation.ignition.common.expressions.functions.AbstractFunction
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- com.inductiveautomation.ignition.common.expressions.DefaultFunctionFactory.IsNullFunction
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- All Implemented Interfaces:
Function
- Enclosing class:
- DefaultFunctionFactory
public static class DefaultFunctionFactory.IsNullFunction extends AbstractFunction
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Field Summary
Fields Modifier and Type Field Description static java.lang.String
FUNCTION_NAME
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Constructor Summary
Constructors Constructor Description IsNullFunction()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description QualifiedValue
execute(Expression[] args)
Execute this function, and return the function's qualified value.java.lang.String
getArgDocString()
Returns a string to be used in the auto-generated function documentation.protected java.lang.String
getFunctionDisplayName()
java.lang.Class<?>
getType()
Returns the type that this function will return upon executionprotected boolean
validateNumArgs(int num)
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Methods inherited from class com.inductiveautomation.ignition.common.expressions.functions.AbstractFunction
executeArg, initArgs, log
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Methods inherited from class com.inductiveautomation.ignition.common.expressions.functions.BaseFunction
connect, copy, disconnect, executeAll, shutdown, startup
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Field Detail
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FUNCTION_NAME
public static final java.lang.String FUNCTION_NAME
- See Also:
- Constant Field Values
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Method Detail
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getFunctionDisplayName
protected java.lang.String getFunctionDisplayName()
- Specified by:
getFunctionDisplayName
in classAbstractFunction
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execute
public QualifiedValue execute(Expression[] args) throws ExpressionException
Description copied from interface:Function
Execute this function, and return the function's qualified value.- Throws:
ExpressionException
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getArgDocString
public java.lang.String getArgDocString()
Description copied from interface:Function
Returns a string to be used in the auto-generated function documentation. The string should represent the arguments for the function, such as "string, count" for the "repeat" function.
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getType
public java.lang.Class<?> getType()
Description copied from interface:Function
Returns the type that this function will return upon execution
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validateNumArgs
protected boolean validateNumArgs(int num)
- Overrides:
validateNumArgs
in classAbstractFunction
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