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## com.singularsys.jep.misc.functions
Class Case

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

All Implemented Interfaces:
  CallbackEvaluationI, CallbackEvaluationI.Runnable, PostfixMathCommandI, java.io.Serializable

    public class Case

extends NaryFunction
implements CallbackEvaluationI, CallbackEvaluationI.Runnable

A case statement. The argument first argument is evaluated and then checked against the 2nd, 4th, 6th argument if the two are equal then the 3rd, 5th, 7th argument is returned. If no arguments match then the last argument is returned (if the number of args is even) for example `case("c","a",5,"b",6,"c",7,8)` will return 7.

Author:
  Richard Morris
See Also:
  `Switch`, 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
`Case()`

Method Summary
`boolean` | `checkNumberOfParameters(int n)` Checks the number of parameters of the function.
`java.lang.Object` | `eval(java.lang.Object[] vals)`
`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, 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

### Case

    public Case()

Method Detail

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

  Specified by:
    `eval` in class `NaryFunction`
  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
  Throws:
    `EvaluationException`
  See Also:
    `Evaluator`

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Copyright © 2008 Singular Systems http://www.singularsys.com/jep