com.hardcode.gdbms.engine.function
Interface Function

All Known Implementing Classes:

BooleanFunction, ConcatenateFunction, Count, DateFunction, LengthFunction, Sum

public interface Function

Interface to be implemented to create a function. The name will be the string used in the SQL to refeer the function. A function will be created once for each instruction execution.

Method Summary

Function	cloneFunction() DOCUMENT ME!
Value	evaluate(Value[] args) DOCUMENT ME!
java.lang.String	getName() DOCUMENT ME!
boolean	isAggregate() DOCUMENT ME!

Method Detail

evaluate

Value evaluate(Value[] args)
               throws FunctionException

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Parameters:

args - DOCUMENT ME!

Returns:

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Throws:

FunctionException - DOCUMENT ME!

getName

java.lang.String getName()

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Returns:

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isAggregate

boolean isAggregate()

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Returns:

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cloneFunction

Function cloneFunction()

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Returns:

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