Package com.singularsys.jep.misc.functions

Class SwitchNonLazy

java.lang.Object

com.singularsys.jep.functions.PostfixMathCommand

com.singularsys.jep.functions.NaryFunction

com.singularsys.jep.misc.functions.SwitchNonLazy

All Implemented Interfaces:

PostfixMathCommandI, Serializable

public class SwitchNonLazy
extends NaryFunction

A switch statement. The argument is selected based on the integer value of the first argument for example switch(2,5,6,7,8) will return 6. The first argument must be an exact integer.

This is the non-lazy version of the function, all arguments are evaluated before the switch statement is executed. See Switch for the lazy evaluation version.

Since:

Jep 4.1

Author:

Richard Morris

See Also:

• Case
• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	SwitchNonLazy.NullBehaviour	Action to take if first argument is null.

Field Summary

Fields inherited from class com.singularsys.jep.functions.PostfixMathCommand

curNumberOfParameters, description, name, NaN, numberOfParameters

Constructor Summary

Constructors

Constructor	Description
SwitchNonLazy()	Default switch statement.
SwitchNonLazy(SwitchNonLazy.NullBehaviour nullBehaviour)	Switch function with defined null behaviour.

Method Summary

Modifier and Type	Method	Description
boolean	checkNumberOfParameters(int n)	Must have at least 2 parameters.
Object	eval(Object[] args)	Evaluate the function
SwitchNonLazy.NullBehaviour	getNullBehaviour()	Behaviour when passed zero arguments.

Methods inherited from class com.singularsys.jep.functions.NaryFunction

run

Methods inherited from class com.singularsys.jep.functions.PostfixMathCommand

asArray, asBool, asDouble, asInt, asLong, asStrictInt, asString, asType, getDescription, getDescription, getDescriptionWithType, getName, getNumberOfParameters, setCurNumberOfParameters, setDescription, setName, toString, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

SwitchNonLazy

public SwitchNonLazy()

Default switch statement. Exceptions are thrown if first argument is null.

SwitchNonLazy

public SwitchNonLazy(SwitchNonLazy.NullBehaviour nullBehaviour)

Switch function with defined null behaviour.

Parameters:

nullBehaviour - action to take if first argument is null.

Since:

Jep 3.5

Method Details

getNullBehaviour

public SwitchNonLazy.NullBehaviour getNullBehaviour()

Behaviour when passed zero arguments.

Returns:

code indicating behaviour type

Since:

Jep 3.5

checkNumberOfParameters

public boolean checkNumberOfParameters(int n)

Must have at least 2 parameters.

Specified by:

checkNumberOfParameters in interface PostfixMathCommandI

Overrides:

checkNumberOfParameters in class PostfixMathCommand

Parameters:

n - number of parameters function will be called with.

Returns:

false if an illegal number of parameters is supplied, true otherwise.

eval

public Object eval(Object[] args)
            throws EvaluationException

Description copied from class: NaryFunction

Evaluate the function

Specified by:

eval in class NaryFunction

Parameters:

args - arguments to the function

Returns:

value returned by the function

Throws:

EvaluationException - if the calculation cannot be performed