org.hibernate.dialect.function
Class AvgFunction

java.lang.Object
  org.hibernate.dialect.function.AvgFunction

All Implemented Interfaces:

SQLFunction

Direct Known Subclasses:

AvgWithArgumentCastFunction

public class AvgFunction
extends Object
implements SQLFunction

The basic JPA spec compliant definition poAVG aggregation function.

Author:

Steve Ebersole

Constructor Summary

AvgFunction()

Method Summary

Type	getReturnType(Type columnType, Mapping mapping) The return type of the function.
boolean	hasArguments() Does this function have any arguments?
boolean	hasParenthesesIfNoArguments() If there are no arguments, are parens required?
String	render(List args, SessionFactoryImplementor factory) Render the function call as SQL fragment.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

AvgFunction

public AvgFunction()

Method Detail

getReturnType

public final Type getReturnType(Type columnType,
                                Mapping mapping)
                         throws QueryException

Description copied from interface: SQLFunction

The return type of the function. May be either a concrete type which is preset, or variable depending upon the type of the first function argument.

Specified by:

getReturnType in interface SQLFunction

Parameters:

columnType - the type of the first argument

mapping - The mapping source.

Returns:

The type to be expected as a return.

Throws:

QueryException - Indicates an issue resolving the return type.

hasArguments

public final boolean hasArguments()

Description copied from interface: SQLFunction

Does this function have any arguments?

Specified by:

hasArguments in interface SQLFunction

Returns:

True if the function expects to have parameters; false otherwise.

hasParenthesesIfNoArguments

public final boolean hasParenthesesIfNoArguments()

Description copied from interface: SQLFunction

If there are no arguments, are parens required?

Specified by:

hasParenthesesIfNoArguments in interface SQLFunction

Returns:

True if a no-arg call of this function requires parentheses.

render

public String render(List args,
                     SessionFactoryImplementor factory)
              throws QueryException

Description copied from interface: SQLFunction

Render the function call as SQL fragment.

Specified by:

render in interface SQLFunction

Parameters:

args - The function arguments

factory - The SessionFactory

Returns:

The rendered function call

Throws:

QueryException - Indicates a problem rendering the function call.

toString

public final String toString()

Overrides:

toString in class Object