Package edu.caltech.nanodb.commands

Class DropIndexCommand

java.lang.Object

edu.caltech.nanodb.commands.Command

edu.caltech.nanodb.commands.DropIndexCommand

public class DropIndexCommand
extends Command

This command-class represents the DROP INDEX DDL command.

Nested Class Summary

Nested classes/interfaces inherited from class edu.caltech.nanodb.commands.Command

Command.Type

Field Summary

Fields

Modifier and Type	Field	Description
private boolean	ifExists	This flag controls whether the drop-index command will fail if the index already doesn't exist when the removal is attempted.
private java.lang.String	indexName	The name of the index to drop.
private java.lang.String	tableName	The name of the table that the index is built against.

Fields inherited from class edu.caltech.nanodb.commands.Command

out

Constructor Summary

Constructors

Constructor	Description
DropIndexCommand(java.lang.String indexName, java.lang.String tableName, boolean ifExists)

Method Summary

Modifier and Type	Method	Description
void	execute(NanoDBServer server)	Actually performs the command.
boolean	getIfExists()	Returns the value of the "if exists" flag; true indicates that it is not an error if the index doesn't exist when this command is issued.
java.lang.String	getIndexName()	Get the name of the index to be dropped.
java.lang.String	getTableName()	Get the name of the table containing the index to be dropped.

Methods inherited from class edu.caltech.nanodb.commands.Command

getCommandType

Methods inherited from class java.lang.Object

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

Field Detail

indexName

private java.lang.String indexName

The name of the index to drop.

tableName

private java.lang.String tableName

The name of the table that the index is built against.

ifExists

private boolean ifExists

This flag controls whether the drop-index command will fail if the index already doesn't exist when the removal is attempted.

Constructor Detail

DropIndexCommand

public DropIndexCommand(java.lang.String indexName,
                        java.lang.String tableName,
                        boolean ifExists)

Method Detail

getTableName

public java.lang.String getTableName()

Get the name of the table containing the index to be dropped.

Returns:

the name of the table containing the index to drop

getIndexName

public java.lang.String getIndexName()

Get the name of the index to be dropped.

Returns:

the name of the index to drop

getIfExists

public boolean getIfExists()

Returns the value of the "if exists" flag; true indicates that it is not an error if the index doesn't exist when this command is issued.

Returns:

the value of the "if exists" flag

execute

public void execute(NanoDBServer server)
             throws ExecutionException

Description copied from class: Command

Actually performs the command.

Specified by:

execute in class Command

Throws:

ExecutionException - if an issue occurs during command execution