Package dev.frostlake.executor.commands

Class ShowCommandHandler

java.lang.Object

dev.frostlake.executor.commands.ShowCommandHandler

All Implemented Interfaces:

CommandHandler

public class ShowCommandHandler
extends Object
implements CommandHandler

Handler for SHOW and DESCRIBE commands: SHOW DATABASES, SHOW SCHEMAS, SHOW TABLES, DESCRIBE TABLE, etc.

Constructor Summary

Constructors

Constructor	Description
ShowCommandHandler(Catalog catalog, QueryExecutor queryExecutor)

Method Summary

Modifier and Type	Method	Description
Catalog	getCatalog()	Get catalog instance
QueryExecutor	getQueryExecutor()	Get query executor instance
ResultSet	handleDescribeStatement(FrostlakeParser.DescribeStatementContext ctx)
ResultSet	handleShowStatement(FrostlakeParser.ShowStatementContext ctx)

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, extractComment, getText, getText, qualifiedNameParts

Constructor Details

ShowCommandHandler

public ShowCommandHandler(Catalog catalog,
 QueryExecutor queryExecutor)

Method Details

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

handleShowStatement

public ResultSet handleShowStatement(FrostlakeParser.ShowStatementContext ctx)

handleDescribeStatement

public ResultSet handleDescribeStatement(FrostlakeParser.DescribeStatementContext ctx)