Module litebridge.db.spi

Package org.litebridge.db.spi.expression

Class ConvertExpression

java.lang.Object

org.litebridge.db.spi.expression.ConvertExpression

All Implemented Interfaces:

DelegateExpression, SelectExpression

public class ConvertExpression
extends Object
implements DelegateExpression

Represents a conversion expression that wraps another SelectExpression, potentially overriding its type.

This class serves as a decorator around a target SelectExpression, allowing for an optional type override. It delegates SQL generation to the encapsulated target expression.

Constructor Summary

Constructors

Constructor	Description
ConvertExpression(SelectExpression target, Class<?> typeOverride)	Constructor.

Method Summary

Modifier and Type	Method	Description
SelectExpression	target()	Retrieves the target expression of this delegate.
String	toSql(Operation operation, ClauseType clause, @Nullable DelegateExpression parent)	Creates a SQL representation of the expression, providing the immediate nesting/parent expression.
Class<?>	typeOverride()	Retrieves the class type that overrides the default type of the wrapped SelectExpression.

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

Constructor Details

ConvertExpression

public ConvertExpression(SelectExpression target,
 Class<?> typeOverride)

Constructor.

Parameters:

target - The encapsulated target column expression for this expression.

typeOverride - The class type that overrides the default type.

Method Details

toSql

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

Description copied from interface: SelectExpression

Creates a SQL representation of the expression, providing the immediate nesting/parent expression.

Specified by:

toSql in interface SelectExpression

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

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.

typeOverride

public Class<?> typeOverride()

Retrieves the class type that overrides the default type of the wrapped SelectExpression.

Returns:

The type override, or null if no override is specified.