Package org.apache.cassandra.schema

Class TableId

java.lang.Object

org.apache.cassandra.schema.TableId

public class TableId
extends java.lang.Object

The unique identifier of a table.

This is essentially a UUID, but we wrap it as it's used quite a bit in the code and having a nicely named class make the code more readable.

Method Summary

Modifier and Type	Method	Description
java.util.UUID	asUUID()
static TableId	deserialize(java.io.DataInput in)
boolean	equals(java.lang.Object o)
static TableId	forSystemTable(java.lang.String keyspace, java.lang.String table)	Creates the UUID of a system table.
static TableId	fromString(java.lang.String idString)
static TableId	fromUUID(java.util.UUID id)
static TableId	generate()
int	hashCode()
void	serialize(java.io.DataOutput out)
int	serializedSize()
static Pair<java.lang.String,TableId>	tableNameAndIdFromFilename(java.lang.String filename)
java.lang.String	toHexString()
java.lang.String	toString()
static TableId	unsafeDeterministic(java.lang.String keyspace, java.lang.String table)

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

fromUUID

public static TableId fromUUID(java.util.UUID id)

generate

public static TableId generate()

fromString

public static TableId fromString(java.lang.String idString)

tableNameAndIdFromFilename

@Nullable
public static Pair<java.lang.String,TableId> tableNameAndIdFromFilename(java.lang.String filename)

forSystemTable

public static TableId forSystemTable(java.lang.String keyspace,
                                     java.lang.String table)

Creates the UUID of a system table. This is deterministically based on the table name as system tables are hardcoded and initialized independently on each node (they don't go through a CREATE), but we still want them to have the same ID everywhere. We shouldn't use this for any other table.

unsafeDeterministic

public static TableId unsafeDeterministic(java.lang.String keyspace,
                                          java.lang.String table)

toHexString

public java.lang.String toHexString()

asUUID

public java.util.UUID asUUID()

hashCode

public final int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public final boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

serialize

public void serialize(java.io.DataOutput out)
               throws java.io.IOException

Throws:

java.io.IOException

serializedSize

public int serializedSize()

deserialize

public static TableId deserialize(java.io.DataInput in)
                           throws java.io.IOException

Throws:

java.io.IOException