Module litebridge.db.spi

Package org.litebridgedb.db.spi.expression

Class DelegateColumnExpression

java.lang.Object

org.litebridgedb.db.spi.expression.ColumnExpressionImpl

org.litebridgedb.db.spi.expression.DelegateColumnExpression

All Implemented Interfaces:

ColumnExpression, DelegateExpression, SelectExpression

Direct Known Subclasses:

AliasedDelegateColumnExpression

public abstract class DelegateColumnExpression
extends ColumnExpressionImpl
implements DelegateExpression

Abstract base class for nesting query expressions such as SQL functions.

This class provides a foundation for creating SQL function expressions by encapsulating a Column and offering a method to access it. It is designed to be extended by concrete implementations to define specific behaviors and SQL representations.

Classes that extend ColumnExpression are expected to implement the toSql method from the SelectExpression interface.

Field Summary

Fields

Modifier and Type	Field	Description
protected final ColumnExpression	target	The encapsulated target column expression of this expression.

Fields inherited from class org.litebridgedb.db.spi.expression.ColumnExpressionImpl

column

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	DelegateColumnExpression(ColumnExpression target)	Constructor.

Method Summary

Modifier and Type	Method	Description
final Column	column()	Retrieves the target column of this expression.
SelectExpression	target()	Retrieves the target expression of this delegate.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.litebridgedb.db.spi.expression.SelectExpression

toSql

Field Details

target

protected final ColumnExpression target

The encapsulated target column expression of this expression.

Constructor Details

DelegateColumnExpression

protected DelegateColumnExpression(ColumnExpression target)

Constructor.

Parameters:

target - The encapsulated target column expression for this expression.

Method Details

target

public SelectExpression target()

Description copied from interface: DelegateExpression

Retrieves the target expression of this delegate.

Specified by:

target in interface DelegateExpression

Returns:

The target expression.

column

public final Column column()

Retrieves the target column of this expression.

Specified by:

column in interface ColumnExpression

Overrides:

column in class ColumnExpressionImpl

Returns:

The target column.