Package edu.caltech.nanodb.commands

Class CreateTableCommand

java.lang.Object

edu.caltech.nanodb.commands.Command

edu.caltech.nanodb.commands.CreateTableCommand

public class CreateTableCommand
extends Command

This command handles the CREATE TABLE DDL operation.

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 java.util.List<ColumnInfo>	columnInfos	List of column-declarations for the new table.
private java.util.List<ConstraintDecl>	constraints	List of constraints for the new table.
private boolean	ifNotExists	If this flag is true then the create-table operation should only be performed if the specified table doesn't already exist.
private static org.apache.logging.log4j.Logger	logger	A logging object for reporting anything interesting that happens.
private CommandProperties	properties	Any additional properties specified in the command.
private java.lang.String	tableName	Name of the table to be created.
private boolean	temporary	If this flag is true then the table is a temporary table.

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

out

Constructor Summary

Constructors

Constructor	Description
CreateTableCommand(java.lang.String tableName)	Create a new object representing a CREATE TABLE statement.

Method Summary

Modifier and Type	Method	Description
void	addColumn(TableColumnDecl colDecl)	Adds a column description to this create-table command.
void	addConstraint(ConstraintDecl con)	Adds a constraint to this create-table command.
void	execute(NanoDBServer server)	Actually performs the command.
java.util.List<ColumnInfo>	getColumns()	Returns an immutable list of the column descriptions that are part of this CREATE TABLE command.
java.util.List<ConstraintDecl>	getConstraints()	Returns an immutable list of the constraint declarations that are part of this CREATE TABLE command.
boolean	getIfNotExists()	Returns true if table creation should only be attempted if it doesn't already exist, false if table creation should always be attempted.
CommandProperties	getProperties()	Returns any additional properties specified for the command, or null if no additional properties were specified.
private void	initIndexes(StorageManager storageManager, TableInfo tableInfo)
private void	initTableConstraints(StorageManager storageManager, Schema schema, java.util.HashMap<java.lang.String,TableInfo> referencedTables)
boolean	isTemporary()	Returns true if the table is a temporary table, false otherwise.
void	setIfNotExists(boolean b)	Sets the flag indicating whether table creation should only be attempted if it doesn't already exist.
void	setProperties(CommandProperties properties)	Sets any additional properties associated with the command.
void	setTemporary(boolean b)	Specifies whether the table is a temporary table or not.
java.lang.String	toString()
java.lang.String	toVerboseString()	Returns a verbose, multi-line string containing all of the details of this table.

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

getCommandType

Methods inherited from class java.lang.Object

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

Field Detail

logger

private static org.apache.logging.log4j.Logger logger

A logging object for reporting anything interesting that happens.

tableName

private java.lang.String tableName

Name of the table to be created.

temporary

private boolean temporary

If this flag is true then the table is a temporary table.

ifNotExists

private boolean ifNotExists

If this flag is true then the create-table operation should only be performed if the specified table doesn't already exist.

columnInfos

private java.util.List<ColumnInfo> columnInfos

List of column-declarations for the new table.

constraints

private java.util.List<ConstraintDecl> constraints

List of constraints for the new table.

properties

private CommandProperties properties

Any additional properties specified in the command.

Constructor Detail

CreateTableCommand

public CreateTableCommand(java.lang.String tableName)

Create a new object representing a CREATE TABLE statement.

Parameters:

tableName - the name of the table to be created

Method Detail

isTemporary

public boolean isTemporary()

Returns true if the table is a temporary table, false otherwise.

Returns:

true if the table is a temporary table, false otherwise.

setTemporary

public void setTemporary(boolean b)

Specifies whether the table is a temporary table or not.

Parameters:

b - true if the table is a temporary table, false otherwise.

getIfNotExists

public boolean getIfNotExists()

Returns true if table creation should only be attempted if it doesn't already exist, false if table creation should always be attempted.

Returns:

true if table creation should only be attempted if it doesn't already exist, false if table creation should always be attempted.

setIfNotExists

public void setIfNotExists(boolean b)

Sets the flag indicating whether table creation should only be attempted if it doesn't already exist.

Parameters:

b - the flag indicating whether table creation should only be attempted if it doesn't already exist.

setProperties

public void setProperties(CommandProperties properties)

Sets any additional properties associated with the command. The value may be null to indicate no properties.

Parameters:

properties - any additional properties to associate with the command.

getProperties

public CommandProperties getProperties()

Returns any additional properties specified for the command, or null if no additional properties were specified.

Returns:

any additional properties specified for the command, or null if no additional properties were specified.

addColumn

public void addColumn(TableColumnDecl colDecl)

Adds a column description to this create-table command. This method is primarily used by the SQL parser.

Parameters:

colDecl - the details of the column to add

Throws:

java.lang.NullPointerException - if colDecl is null

getColumns

public java.util.List<ColumnInfo> getColumns()

Returns an immutable list of the column descriptions that are part of this CREATE TABLE command.

Returns:

an immutable list of the column descriptions that are part of this CREATE TABLE command.

addConstraint

public void addConstraint(ConstraintDecl con)

Adds a constraint to this create-table command. This method is primarily used by the SQL parser.

Parameters:

con - the details of the table constraint to add

Throws:

java.lang.NullPointerException - if con is null

getConstraints

public java.util.List<ConstraintDecl> getConstraints()

Returns an immutable list of the constraint declarations that are part of this CREATE TABLE command.

Returns:

an immutable list of the constraint declarations that are part of this CREATE TABLE command.

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

initTableConstraints

private void initTableConstraints(StorageManager storageManager,
                                  Schema schema,
                                  java.util.HashMap<java.lang.String,TableInfo> referencedTables)

initIndexes

private void initIndexes(StorageManager storageManager,
                         TableInfo tableInfo)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

toVerboseString

public java.lang.String toVerboseString()

Returns a verbose, multi-line string containing all of the details of this table.

Returns:

a detailed description of the table described by this command