org.apache.cassandra.cql3.functions

Class UDHelper

java.lang.Object

org.apache.cassandra.cql3.functions.UDHelper

public final class UDHelper
extends java.lang.Object

Helper class for User Defined Functions, Types and Aggregates.

Constructor Summary

Constructors

Constructor and Description
UDHelper()

Method Summary

Modifier and Type	Method and Description
static java.lang.Class<?>	asJavaClass(TypeCodec<?> codec)
static TypeCodec<java.lang.Object>	codecFor(DataType dataType)
static java.lang.Object	deserialize(TypeCodec<?> codec, ProtocolVersion protocolVersion, java.nio.ByteBuffer value)
static DataType	driverType(AbstractType abstractType) Returns the DataType for the C* internal type.
static DataType	driverTypeFromAbstractType(java.lang.String abstractTypeDef)
static DataType[]	driverTypes(java.util.List<AbstractType<?>> abstractTypes) Construct an array containing the DataTypes for the C* internal types.
static boolean	isNullOrEmpty(AbstractType<?> type, java.nio.ByteBuffer bb)
static java.nio.ByteBuffer	serialize(TypeCodec<?> codec, ProtocolVersion protocolVersion, java.lang.Object value)
static com.google.common.reflect.TypeToken<?>[]	typeTokens(TypeCodec<java.lang.Object>[] dataTypes, boolean calledOnNullInput) Construct an array containing the Java classes for the given DataTypes.

Methods inherited from class java.lang.Object

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

Constructor Detail

UDHelper

public UDHelper()

Method Detail

codecFor

public static TypeCodec<java.lang.Object> codecFor(DataType dataType)

typeTokens

public static com.google.common.reflect.TypeToken<?>[] typeTokens(TypeCodec<java.lang.Object>[] dataTypes,
                                                                  boolean calledOnNullInput)

Construct an array containing the Java classes for the given DataTypes.

Parameters:

dataTypes - array with UDF argument types

calledOnNullInput - whether to allow null as an argument value

Returns:

array of same size with UDF arguments

driverTypes

public static DataType[] driverTypes(java.util.List<AbstractType<?>> abstractTypes)

Construct an array containing the DataTypes for the C* internal types.

Parameters:

abstractTypes - list with UDF argument types

Returns:

array with argument types as DataType

driverType

public static DataType driverType(AbstractType abstractType)

Returns the DataType for the C* internal type.

driverTypeFromAbstractType

public static DataType driverTypeFromAbstractType(java.lang.String abstractTypeDef)

deserialize

public static java.lang.Object deserialize(TypeCodec<?> codec,
                                           ProtocolVersion protocolVersion,
                                           java.nio.ByteBuffer value)

serialize

public static java.nio.ByteBuffer serialize(TypeCodec<?> codec,
                                            ProtocolVersion protocolVersion,
                                            java.lang.Object value)

asJavaClass

public static java.lang.Class<?> asJavaClass(TypeCodec<?> codec)

isNullOrEmpty

public static boolean isNullOrEmpty(AbstractType<?> type,
                                    java.nio.ByteBuffer bb)