org.hibernate.dialect.function

Class CastFunction

java.lang.Object

org.hibernate.dialect.function.CastFunction

All Implemented Interfaces:

SQLFunction

public class CastFunction
extends Object
implements SQLFunction

ANSI-SQL style cast(foo as type) where the type is a Hibernate type

Author:

Gavin King

Field Summary

Fields

Modifier and Type	Field and Description
static CastFunction	INSTANCE Singleton access

Constructor Summary

Constructors

Constructor and Description
CastFunction()

Method Summary

Methods

Modifier and Type	Method and Description
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 parentheses required?
String	render(Type columnType, List args, SessionFactoryImplementor factory) Render the function call as SQL fragment.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final CastFunction INSTANCE

Singleton access

Constructor Detail

CastFunction

public CastFunction()

Method Detail

hasArguments

public 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 boolean hasParenthesesIfNoArguments()

Description copied from interface: SQLFunction

If there are no arguments, are parentheses required?

Specified by:

hasParenthesesIfNoArguments in interface SQLFunction

Returns:

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

getReturnType

public 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.

Note, the 'firstArgumentType' parameter should match the one passed into SQLFunction.render(org.hibernate.type.Type, java.util.List, org.hibernate.engine.spi.SessionFactoryImplementor)

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.

render

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

Description copied from interface: SQLFunction

Render the function call as SQL fragment.

Note, the 'firstArgumentType' parameter should match the one passed into SQLFunction.getReturnType(org.hibernate.type.Type, org.hibernate.engine.spi.Mapping)

Specified by:

render in interface SQLFunction

Parameters:

columnType - The type of the first argument

args - The function arguments

factory - The SessionFactory

Returns:

The rendered function call

Throws:

QueryException - Indicates a problem rendering the function call.