org.outerj.expression
Class NegateFunction

java.lang.Object
  extended byorg.outerj.expression.AbstractExpression
      extended byorg.outerj.expression.NegateFunction
All Implemented Interfaces:
Expression

public class NegateFunction
extends AbstractExpression


Field Summary
 
Fields inherited from class org.outerj.expression.AbstractExpression
arguments, column, line
 
Constructor Summary
NegateFunction()
           
 
Method Summary
 void check()
          Check if the expression's structure is OK.
 java.lang.Object evaluate(ExpressionContext context)
          Evaluates this expression and returns the result of that evaluation.
 java.lang.String getDescription()
          Returns a description of this expression that will be shown to the user in error messages.
 java.lang.Class getResultType()
          Returns the class of the the type of object that this expression will return.
 
Methods inherited from class org.outerj.expression.AbstractExpression
addArgument, addArgument, checkArgument, checkArguments, checkArgumentsOfSameType, checkNoArguments, getColumn, getLine, setPosition
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

NegateFunction

public NegateFunction()
Method Detail

evaluate

public java.lang.Object evaluate(ExpressionContext context)
                          throws ExpressionException
Description copied from interface: Expression
Evaluates this expression and returns the result of that evaluation.

Throws:
ExpressionException

getResultType

public java.lang.Class getResultType()
Description copied from interface: Expression
Returns the class of the the type of object that this expression will return. This allows to check the correctness of functions at compile-time. If unknown, this may return null.


check

public void check()
           throws ExpressionException
Description copied from interface: Expression
Check if the expression's structure is OK. If everything is ok, this method should just return.

Specified by:
check in interface Expression
Overrides:
check in class AbstractExpression
Throws:
ExpressionException

getDescription

public java.lang.String getDescription()
Description copied from interface: Expression
Returns a description of this expression that will be shown to the user in error messages.