org.hibernate.dialect.function
Class AbstractAnsiTrimEmulationFunction

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

All Implemented Interfaces:

SQLFunction

Direct Known Subclasses:

AnsiTrimEmulationFunction

public abstract class AbstractAnsiTrimEmulationFunction
extends Object
implements SQLFunction

A SQLFunction providing support for implementing TRIM functionality (as defined by both the ANSI SQL and JPA specs) in cases where the dialect may not support the full trim function itself.

Follows the template pattern in order to implement the render(java.util.List, org.hibernate.engine.SessionFactoryImplementor) method.

Author:

Steve Ebersole

Constructor Summary

AbstractAnsiTrimEmulationFunction()

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.
protected abstract SQLFunction	resolveBothSpaceTrimFromFunction() Resolve the function definition which should be used to trim both leading and trailing spaces.
protected abstract SQLFunction	resolveBothSpaceTrimFunction() Resolve the function definition which should be used to trim both leading and trailing spaces.
protected abstract SQLFunction	resolveBothTrimFunction() Resolve the function definition which should be used to trim the specified character from both the beginning (leading) and end (trailing) of the trim source.
protected abstract SQLFunction	resolveLeadingSpaceTrimFunction() Resolve the function definition which should be used to trim leading spaces.
protected abstract SQLFunction	resolveLeadingTrimFunction() Resolve the function definition which should be used to trim the specified character from the beginning (leading) of the trim source.
protected abstract SQLFunction	resolveTrailingSpaceTrimFunction() Resolve the function definition which should be used to trim trailing spaces.
protected abstract SQLFunction	resolveTrailingTrimFunction() Resolve the function definition which should be used to trim the specified character from the end (trailing) of the trim source.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractAnsiTrimEmulationFunction

public AbstractAnsiTrimEmulationFunction()

Method Detail

getReturnType

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

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()

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()

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

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.

resolveBothSpaceTrimFunction

protected abstract SQLFunction resolveBothSpaceTrimFunction()

Resolve the function definition which should be used to trim both leading and trailing spaces.

In this form, the imput arguments is missing the FROM keyword.

Returns:

The sql function

resolveBothSpaceTrimFromFunction

protected abstract SQLFunction resolveBothSpaceTrimFromFunction()

Resolve the function definition which should be used to trim both leading and trailing spaces.

The same as {#link resolveBothSpaceTrimFunction} except that here theFROM is included and will need to be accounted for during SQLFunction.render(java.util.List, org.hibernate.engine.SessionFactoryImplementor) processing.

Returns:

The sql function

resolveLeadingSpaceTrimFunction

protected abstract SQLFunction resolveLeadingSpaceTrimFunction()

Resolve the function definition which should be used to trim leading spaces.

Returns:

The sql function

resolveTrailingSpaceTrimFunction

protected abstract SQLFunction resolveTrailingSpaceTrimFunction()

Resolve the function definition which should be used to trim trailing spaces.

Returns:

The sql function

resolveBothTrimFunction

protected abstract SQLFunction resolveBothTrimFunction()

Resolve the function definition which should be used to trim the specified character from both the beginning (leading) and end (trailing) of the trim source.

Returns:

The sql function

resolveLeadingTrimFunction

protected abstract SQLFunction resolveLeadingTrimFunction()

Resolve the function definition which should be used to trim the specified character from the beginning (leading) of the trim source.

Returns:

The sql function

resolveTrailingTrimFunction

protected abstract SQLFunction resolveTrailingTrimFunction()

Resolve the function definition which should be used to trim the specified character from the end (trailing) of the trim source.

Returns:

The sql function