com.datastax.driver.core

Class TypeCodec.PrimitiveDoubleCodec

java.lang.Object

com.datastax.driver.core.TypeCodec<Double>

com.datastax.driver.core.TypeCodec.PrimitiveDoubleCodec

Enclosing class:

TypeCodec<T>

public abstract static class TypeCodec.PrimitiveDoubleCodec
extends TypeCodec<Double>

A codec that is capable of handling primitive doubles, thus avoiding the overhead of boxing and unboxing such primitives.

Nested Class Summary

Nested classes/interfaces inherited from class com.datastax.driver.core.TypeCodec

TypeCodec.AbstractCollectionCodec<E,C extends Collection<E>>, TypeCodec.AbstractMapCodec<K,V>, TypeCodec.AbstractTupleCodec<T>, TypeCodec.AbstractUDTCodec<T>, TypeCodec.PrimitiveBooleanCodec, TypeCodec.PrimitiveByteCodec, TypeCodec.PrimitiveDoubleCodec, TypeCodec.PrimitiveFloatCodec, TypeCodec.PrimitiveIntCodec, TypeCodec.PrimitiveLongCodec, TypeCodec.PrimitiveShortCodec

Field Summary

Fields inherited from class com.datastax.driver.core.TypeCodec

cqlType, javaType

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	PrimitiveDoubleCodec(DataType cqlType)

Method Summary

Modifier and Type	Method and Description
Double	deserialize(ByteBuffer bytes, ProtocolVersion protocolVersion) Deserialize the given ByteBuffer instance according to the CQL type handled by this codec.
abstract double	deserializeNoBoxing(ByteBuffer v, ProtocolVersion protocolVersion)
ByteBuffer	serialize(Double value, ProtocolVersion protocolVersion) Serialize the given value according to the CQL type handled by this codec.
abstract ByteBuffer	serializeNoBoxing(double v, ProtocolVersion protocolVersion)

Methods inherited from class com.datastax.driver.core.TypeCodec

accepts, accepts, accepts, accepts, ascii, bigint, blob, cboolean, cdouble, cfloat, cint, counter, custom, date, decimal, duration, format, getCqlType, getJavaType, inet, list, map, parse, set, smallInt, time, timestamp, timeUUID, tinyInt, toString, tuple, userType, uuid, varchar, varint

Methods inherited from class java.lang.Object

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

Constructor Detail

PrimitiveDoubleCodec

protected PrimitiveDoubleCodec(DataType cqlType)

Method Detail

serializeNoBoxing

public abstract ByteBuffer serializeNoBoxing(double v,
                                             ProtocolVersion protocolVersion)

deserializeNoBoxing

public abstract double deserializeNoBoxing(ByteBuffer v,
                                           ProtocolVersion protocolVersion)

serialize

public ByteBuffer serialize(Double value,
                            ProtocolVersion protocolVersion)

Description copied from class: TypeCodec

Serialize the given value according to the CQL type handled by this codec.

Implementation notes:

1. Null values should be gracefully handled and no exception should be raised; these should be considered as the equivalent of a NULL CQL value;
2. Codecs for CQL collection types should not permit null elements;
3. Codecs for CQL collection types should treat a null input as the equivalent of an empty collection.

Specified by:

serialize in class TypeCodec<Double>

Parameters:

value - An instance of T; may be null.

protocolVersion - the protocol version to use when serializing bytes. In most cases, the proper value to provide for this argument is the value returned by ProtocolOptions.getProtocolVersion() (which is the protocol version in use by the driver).

Returns:

A ByteBuffer instance containing the serialized form of T

deserialize

public Double deserialize(ByteBuffer bytes,
                          ProtocolVersion protocolVersion)

Description copied from class: TypeCodec

Deserialize the given ByteBuffer instance according to the CQL type handled by this codec.

Implementation notes:

1. Null or empty buffers should be gracefully handled and no exception should be raised; these should be considered as the equivalent of a NULL CQL value and, in most cases, should map to null or a default value for the corresponding Java type, if applicable;
2. Codecs for CQL collection types should clearly document whether they return immutable collections or not (note that the driver's default collection codecs return mutable collections);
3. Codecs for CQL collection types should avoid returning null; they should return empty collections instead (the driver's default collection codecs all comply with this rule).
4. The provided ByteBuffer should never be consumed by read operations that modify its current position; if necessary, ByteBuffer.duplicate() duplicate} it before consuming.

Specified by:

deserialize in class TypeCodec<Double>

Parameters:

bytes - A ByteBuffer instance containing the serialized form of T; may be null or empty.

protocolVersion - the protocol version to use when serializing bytes. In most cases, the proper value to provide for this argument is the value returned by ProtocolOptions.getProtocolVersion() (which is the protocol version in use by the driver).

Returns:

An instance of T