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 + Aggregates.

Constructor Summary

Constructors

Constructor and Description
UDHelper()

Method Summary

Modifier and Type	Method and Description
static java.lang.Class<?>	asJavaClass(com.datastax.driver.core.TypeCodec<?> codec)
static java.lang.Object	deserialize(com.datastax.driver.core.TypeCodec<?> codec, int protocolVersion, java.nio.ByteBuffer value)
static com.datastax.driver.core.DataType	driverType(AbstractType abstractType) Returns the Java Driver DataType for the C* internal type.
static com.datastax.driver.core.DataType[]	driverTypes(java.util.List<AbstractType<?>> abstractTypes) Construct an array containing the Java Driver DataTypes for the C* internal types.
static boolean	isNullOrEmpty(AbstractType<?> type, java.nio.ByteBuffer bb)
static java.lang.Class<?>[]	javaTypes(com.datastax.driver.core.TypeCodec<java.lang.Object>[] dataTypes, boolean calledOnNullInput) Construct an array containing the Java classes for the given Java Driver DataTypes.
static java.nio.ByteBuffer	serialize(com.datastax.driver.core.TypeCodec<?> codec, int protocolVersion, java.lang.Object value)

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

javaTypes

public static java.lang.Class<?>[] javaTypes(com.datastax.driver.core.TypeCodec<java.lang.Object>[] dataTypes,
                                             boolean calledOnNullInput)

Construct an array containing the Java classes for the given Java Driver 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 com.datastax.driver.core.DataType[] driverTypes(java.util.List<AbstractType<?>> abstractTypes)

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

Parameters:

abstractTypes - list with UDF argument types

Returns:

array with argument types as DataType

driverType

public static com.datastax.driver.core.DataType driverType(AbstractType abstractType)

Returns the Java Driver DataType for the C* internal type.

deserialize

public static java.lang.Object deserialize(com.datastax.driver.core.TypeCodec<?> codec,
                                           int protocolVersion,
                                           java.nio.ByteBuffer value)

serialize

public static java.nio.ByteBuffer serialize(com.datastax.driver.core.TypeCodec<?> codec,
                                            int protocolVersion,
                                            java.lang.Object value)

asJavaClass

public static java.lang.Class<?> asJavaClass(com.datastax.driver.core.TypeCodec<?> codec)

isNullOrEmpty

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