Class SwitchDefault
- java.lang.Object
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- com.singularsys.jep.functions.PostfixMathCommand
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- com.singularsys.jep.misc.functions.SwitchDefault
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- All Implemented Interfaces:
CallbackEvaluationI
,PostfixMathCommandI
,java.io.Serializable
public class SwitchDefault extends PostfixMathCommand implements CallbackEvaluationI
A switch statement, with a default value. The argument is selected based on the integer value of the first argument, the last argument is returned if the first argument is greater than the number of arguments -2. For exampleswitchDefault(2,5,6,7,8)
will return 5, andswitchDefault(9,5,6,7,8)
will return 8. The first argument must be an exact integer.- Author:
- Richard Morris
- See Also:
Case
, Serialized Form
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
SwitchDefault.NullBehaviour
Action to take if first argument is null.
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Field Summary
Fields Modifier and Type Field Description protected SwitchDefault.NullBehaviour
nullBehaviour
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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 SwitchDefault()
Default switch statement.SwitchDefault(SwitchDefault.NullBehaviour nullBehaviour)
Switch function with defined null behaviour.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
checkNumberOfParameters(int n)
Checks the number of parameters of the function.java.lang.Object
evaluate(Node node, Evaluator pv)
Performs some special evaluation on the node.SwitchDefault.NullBehaviour
getNullBehaviour()
Behaviour when passed zero arguments.-
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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Field Detail
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nullBehaviour
protected SwitchDefault.NullBehaviour nullBehaviour
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Constructor Detail
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SwitchDefault
public SwitchDefault()
Default switch statement. Exceptions are thrown if first argument is null.
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SwitchDefault
public SwitchDefault(SwitchDefault.NullBehaviour nullBehaviour)
Switch function with defined null behaviour.- Parameters:
nullBehaviour
- action to take if first argument is null.- Since:
- Jep 3.5
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Method Detail
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checkNumberOfParameters
public boolean checkNumberOfParameters(int n)
Description copied from class:PostfixMathCommand
Checks the number of parameters of the function. Functions which set numberOfParameter=-1 should overload this method- Specified by:
checkNumberOfParameters
in interfacePostfixMathCommandI
- Overrides:
checkNumberOfParameters
in classPostfixMathCommand
- Parameters:
n
- number of parameters function will be called with.- Returns:
- false if an illegal number of parameters is supplied, true otherwise.
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getNullBehaviour
public SwitchDefault.NullBehaviour getNullBehaviour()
Behaviour when passed zero arguments.- Returns:
- code indicating behaviour type
- Since:
- Jep 3.5
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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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