org.mybatis.dynamic.sql.select.function

Class AbstractTypeConvertingFunction<T,R,U extends AbstractTypeConvertingFunction<T,R,U>>

java.lang.Object

org.mybatis.dynamic.sql.select.function.AbstractTypeConvertingFunction<T,R,U>

Type Parameters:

T - The type of the underlying column. For example, if a function converts a VARCHAR to an INT, then the underlying type will be a String

R - The type of the column after the conversion. For example, if a function converts a VARCHAR to an INT, then the converted type will be Integer

U - the specific subtype that implements the function

All Implemented Interfaces:

BasicColumn, BindableColumn<R>

Direct Known Subclasses:

AbstractUniTypeFunction

public abstract class AbstractTypeConvertingFunction<T,R,U extends AbstractTypeConvertingFunction<T,R,U>>
extends Object
implements BindableColumn<R>

Represents a function that can change the underlying type. For example, converting a binary field for a base64 string, or an integer to a string, etc.

Thanks to @endink for the idea.

Author:

Jeff Butler

Field Summary

Fields

Modifier and Type	Field and Description
protected String	alias
protected BindableColumn<T>	column

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractTypeConvertingFunction(BindableColumn<T> column)

Method Summary

Modifier and Type	Method and Description
Optional<String>	alias() Returns the columns alias if one has been specified.
U	as(String alias) Override the base method definition to make it more specific to this interface.
protected abstract U	copy()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.mybatis.dynamic.sql.BindableColumn

convertParameterType, jdbcType, renderingStrategy, typeHandler

Methods inherited from interface org.mybatis.dynamic.sql.BasicColumn

columnList, renderWithTableAlias, renderWithTableAndColumnAlias

Field Detail

column

protected final BindableColumn<T> column

alias

protected String alias

Constructor Detail

AbstractTypeConvertingFunction

protected AbstractTypeConvertingFunction(BindableColumn<T> column)

Method Detail

alias

public Optional<String> alias()

Description copied from interface: BasicColumn

Returns the columns alias if one has been specified.

Specified by:

alias in interface BasicColumn

Returns:

the column alias

as

public U as(String alias)

Description copied from interface: BindableColumn

Override the base method definition to make it more specific to this interface.

Specified by:

as in interface BasicColumn

Specified by:

as in interface BindableColumn<R>

Parameters:

alias - the column alias to set

Returns:

new instance with alias set

copy

protected abstract U copy()