Package org.apache.cassandra.db

Class SchemaCQLHelper

java.lang.Object

org.apache.cassandra.db.SchemaCQLHelper

public class SchemaCQLHelper
extends java.lang.Object

Helper methods to represent TableMetadata and related objects in CQL format

Constructor Summary

Constructors

Constructor	Description
SchemaCQLHelper()

Method Summary

Modifier and Type	Method	Description
static java.util.stream.Stream<java.lang.String>	getIndexesAsCQL(TableMetadata metadata, boolean ifNotExists)	Build a CQL String representation of Indexes on columns in the given Column Family
static java.lang.String	getTableMetadataAsCQL(TableMetadata metadata, KeyspaceMetadata keyspaceMetadata)	Build a CQL String representation of Column Family Metadata.
static java.util.stream.Stream<java.lang.String>	getUserTypesAsCQL(TableMetadata metadata, Types types, boolean ifNotExists)	Build a CQL String representation of User Types used in the given table.
static java.util.stream.Stream<java.lang.String>	reCreateStatementsForSchemaCql(TableMetadata metadata, KeyspaceMetadata keyspaceMetadata)	Generates the DDL statement for a schema.cql snapshot file.
static java.lang.String	toCqlType(AbstractType<?> type)	Converts the type to a CQL type.

Methods inherited from class java.lang.Object

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

Constructor Detail

SchemaCQLHelper

public SchemaCQLHelper()

Method Detail

reCreateStatementsForSchemaCql

public static java.util.stream.Stream<java.lang.String> reCreateStatementsForSchemaCql(TableMetadata metadata,
                                                                                       KeyspaceMetadata keyspaceMetadata)

Generates the DDL statement for a schema.cql snapshot file.

getTableMetadataAsCQL

public static java.lang.String getTableMetadataAsCQL(TableMetadata metadata,
                                                     KeyspaceMetadata keyspaceMetadata)

Build a CQL String representation of Column Family Metadata. *Note*: this is _only_ visible for testing; you generally shouldn't re-create a single table in isolation as that will not contain everything needed for user types.

getUserTypesAsCQL

public static java.util.stream.Stream<java.lang.String> getUserTypesAsCQL(TableMetadata metadata,
                                                                          Types types,
                                                                          boolean ifNotExists)

Build a CQL String representation of User Types used in the given table. Type order is ensured as types are built incrementally: from the innermost (most nested) to the outermost.

Parameters:

metadata - the table for which to extract the user types CQL statements.

types - the user types defined in the keyspace of the dumped table (which will thus contain any user type used by metadata).

ifNotExists - set to true if IF NOT EXISTS should be appended after CREATE TYPE string.

Returns:

a list of CREATE TYPE statements corresponding to all the types used in metadata.

getIndexesAsCQL

public static java.util.stream.Stream<java.lang.String> getIndexesAsCQL(TableMetadata metadata,
                                                                        boolean ifNotExists)

Build a CQL String representation of Indexes on columns in the given Column Family

Parameters:

metadata - the table for which to extract the index CQL statements.

ifNotExists - set to true if IF NOT EXISTS should be appended after CREATE INDEX string.

Returns:

a list of CREATE INDEX statements corresponding to table metadata.

toCqlType

public static java.lang.String toCqlType(AbstractType<?> type)

Converts the type to a CQL type. This method special cases empty and UDTs so the string can be used in a create statement. Special cases

• empty - replaces with 'org.apache.cassandra.db.marshal.EmptyType'. empty is the tostring of the type in CQL but not allowed to create as empty, but fully qualified name is allowed
• UserType - replaces with TupleType