Package dev.frostlake.executor.commands

Class DDLCommandHandler

java.lang.Object

dev.frostlake.executor.commands.DDLCommandHandler

All Implemented Interfaces:

CommandHandler

public class DDLCommandHandler
extends Object
implements CommandHandler

Handler for DDL (Data Definition Language) commands: CREATE, DROP, ALTER, USE, TRUNCATE, COMMENT

Constructor Summary

Constructors

Constructor	Description
DDLCommandHandler(Catalog catalog, QueryExecutor queryExecutor)

Method Summary

Modifier and Type	Method	Description
void	applyWarehousePropertyPublic(Warehouse warehouse, FrostlakeParser.WarehousePropertyContext prop)
String	extractComment(FrostlakeParser.CommentClauseContext ctx)	Extract comment from comment clause
Catalog	getCatalog()	Get catalog instance
ColumnDefinitionParser	getColumnParser()	The shared column/constraint parser, reused by ALTER TABLE ADD COLUMN so it honours DEFAULT / NOT NULL.
QueryExecutor	getQueryExecutor()	Get query executor instance
Object	handleAlterStatement(FrostlakeParser.AlterStatementContext ctx)
Object	handleCreateStatement(FrostlakeParser.CreateStatementContext ctx)
Object	handleDropStatement(FrostlakeParser.DropStatementContext ctx)	DROP statements are handled by DropCommandHandler.
Object	handleUndropStatement(FrostlakeParser.UndropStatementContext ctx)
Object	handleUseStatement(FrostlakeParser.UseStatementContext ctx)
void	setStreamManager(StreamManager streamManager)
void	setTaskScheduler(TaskScheduler taskScheduler)

Methods inherited from class java.lang.Object

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

Methods inherited from interface dev.frostlake.executor.commands.CommandHandler

extractComment, getText, getText, qualifiedNameParts

Constructor Details

DDLCommandHandler

public DDLCommandHandler(Catalog catalog,
 QueryExecutor queryExecutor)

Method Details

setStreamManager

public void setStreamManager(StreamManager streamManager)

getColumnParser

public ColumnDefinitionParser getColumnParser()

The shared column/constraint parser, reused by ALTER TABLE ADD COLUMN so it honours DEFAULT / NOT NULL.

Returns:

the column-definition parser this handler and its create handlers share

setTaskScheduler

public void setTaskScheduler(TaskScheduler taskScheduler)

getCatalog

public Catalog getCatalog()

Description copied from interface: CommandHandler

Get catalog instance

Specified by:

getCatalog in interface CommandHandler

Returns:

the engine's metastore catalog, holding the objects this handler reads and mutates

getQueryExecutor

public QueryExecutor getQueryExecutor()

Description copied from interface: CommandHandler

Get query executor instance

Specified by:

getQueryExecutor in interface CommandHandler

Returns:

the engine's query executor, for handlers that run nested queries or need session state

extractComment

public String extractComment(FrostlakeParser.CommentClauseContext ctx)

Description copied from interface: CommandHandler

Extract comment from comment clause

Specified by:

extractComment in interface CommandHandler

Parameters:

ctx - the COMMENT [=] '<text>' clause, or null when the statement carries none

Returns:

the comment text with its single-quote or dollar-quote delimiters stripped, or null when the clause is absent

handleDropStatement

public Object handleDropStatement(FrostlakeParser.DropStatementContext ctx)

DROP statements are handled by DropCommandHandler.

Parameters:

ctx - the DROP statement's parse tree, forwarded unchanged

Returns:

the drop handler's result (null — the executor renders the standard status message)

handleCreateStatement

public Object handleCreateStatement(FrostlakeParser.CreateStatementContext ctx)

handleAlterStatement

public Object handleAlterStatement(FrostlakeParser.AlterStatementContext ctx)

handleUseStatement

public Object handleUseStatement(FrostlakeParser.UseStatementContext ctx)

handleUndropStatement

public Object handleUndropStatement(FrostlakeParser.UndropStatementContext ctx)

applyWarehousePropertyPublic

public void applyWarehousePropertyPublic(Warehouse warehouse,
 FrostlakeParser.WarehousePropertyContext prop)