Module litebridge.db.spi.impl

Package org.litebridge.db.spi.impl.function

Class DelegateColumnExpressionImpl

java.lang.Object

org.litebridge.db.spi.expression.ColumnExpressionImpl

org.litebridge.db.spi.expression.DelegateColumnExpression

org.litebridge.db.spi.impl.function.DelegateColumnExpressionImpl

All Implemented Interfaces:

ColumnExpression, DelegateExpression, SelectExpression

Direct Known Subclasses:

FunctionExpression

public class DelegateColumnExpressionImpl
extends DelegateColumnExpression

A nestable column expression with support for SQL aliasing.

This class extends NestableExpression and integrates the functionality of aliasing of results through a ColumnIdentifierGenerator.

The primary responsibility of this class is to provide SQL representations of nestable function expressions, either with or without an alias.

Field Summary

Fields

Modifier and Type	Field	Description
protected final ColumnIdentifierGenerator	columnIdentifierGenerator	The generator used for creating SQL column identifiers.

Fields inherited from class org.litebridge.db.spi.expression.DelegateColumnExpression

target

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

column

Constructor Summary

Constructors

Constructor	Description
DelegateColumnExpressionImpl(ColumnExpression target, ColumnIdentifierGenerator columnIdentifierGenerator)	Constructs a DelegateColumnExpressionImpl with the specified target column and identifier generator.

Method Summary

Modifier and Type	Method	Description
String	toSql(Operation operation, ClauseType clause, @Nullable DelegateExpression parent)	Creates a SQL representation of the expression.

Methods inherited from class org.litebridge.db.spi.expression.DelegateColumnExpression

column, target

Methods inherited from class java.lang.Object

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

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

toSql

Field Details

columnIdentifierGenerator

protected final ColumnIdentifierGenerator columnIdentifierGenerator

The generator used for creating SQL column identifiers.

Constructor Details

DelegateColumnExpressionImpl

public DelegateColumnExpressionImpl(ColumnExpression target,
 ColumnIdentifierGenerator columnIdentifierGenerator)

Constructs a DelegateColumnExpressionImpl with the specified target column and identifier generator.

Parameters:

target - the target column expression

columnIdentifierGenerator - the generator to use for creating SQL identifiers

Method Details

toSql

public String toSql(Operation operation,
 ClauseType clause,
 @Nullable DelegateExpression parent)

Creates a SQL representation of the expression.

This is usually used for expressions that do not require any aliases.

Parameters:

operation - the operation that is being executed

clause - The current clause type being evaluated

parent - The parent expression/nesting expression, or null if this is a top-level expression

Returns:

the SQL representation of the expression