com.singularsys.jep.misc.functions
Class Switch

java.lang.Object
  com.singularsys.jep.functions.PostfixMathCommand
      com.singularsys.jep.functions.NaryFunction
          com.singularsys.jep.misc.functions.Switch

All Implemented Interfaces:

CallbackEvaluationI, CallbackEvaluationI.Runnable, PostfixMathCommandI, java.io.Serializable

public class Switch
extends NaryFunction
implements CallbackEvaluationI, CallbackEvaluationI.Runnable

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

Author:

Richard Morris

See Also:

Case, Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface com.singularsys.jep.functions.CallbackEvaluationI

CallbackEvaluationI.Runnable

Field Summary

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

curNumberOfParameters, name, NaN, numberOfParameters

Constructor Summary

Switch()

Method Summary

java.lang.Object	eval(java.lang.Object[] vals) Evaluate the function
java.lang.Object	evaluate(Node node, Evaluator pv) Performs some special evaluation on the node.

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, checkNumberOfParameters, checkStack, getName, getNumberOfParameters, setCurNumberOfParameters, setName, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.singularsys.jep.functions.CallbackEvaluationI.Runnable

run

Constructor Detail

Switch

public Switch()

Method Detail

eval

public java.lang.Object eval(java.lang.Object[] vals)
                      throws EvaluationException

Description copied from class: NaryFunction

Evaluate the function

Specified by:

eval in class NaryFunction

Parameters:

vals - arguments to the function

Returns:

value returned by the function

Throws:

EvaluationException

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 call

 pv.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 interface CallbackEvaluationI

Parameters:

node - The current node

pv - 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

See Also:

Evaluator