com.datastax.driver.extras.codecs.arrays

Class DoubleArrayCodec

java.lang.Object

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

com.datastax.driver.extras.codecs.arrays.AbstractArrayCodec<T>

com.datastax.driver.extras.codecs.arrays.AbstractPrimitiveArrayCodec<double[]>

com.datastax.driver.extras.codecs.arrays.DoubleArrayCodec

public class DoubleArrayCodec
extends AbstractPrimitiveArrayCodec<double[]>

A codec that maps the CQL type list<double> to the Java type double[].

Note that this codec is designed for performance and converts CQL lists directly to double[], thus avoiding any unnecessary boxing and unboxing of Java primitive double values; it also instantiates arrays without the need for an intermediary Java List object.

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

Modifier and Type	Field and Description
static DoubleArrayCodec	instance

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

cqlType, javaType

Constructor Summary

Constructors

Constructor and Description
DoubleArrayCodec()

Method Summary

Modifier and Type	Method and Description
protected void	deserializeElement(ByteBuffer input, double[] array, int index, ProtocolVersion protocolVersion) Read the indexth element of array from input.
protected void	formatElement(StringBuilder output, double[] array, int index) Format the indexth element of array to output.
protected double[]	newInstance(int size) Create a new array instance with the given size.
protected void	parseElement(String input, double[] array, int index) Parse the indexth element of array from input.
protected void	serializeElement(ByteBuffer output, double[] array, int index, ProtocolVersion protocolVersion) Write the indexth element of array to output.
protected int	sizeOfComponentType() Return the size in bytes of the array component type.

Methods inherited from class com.datastax.driver.extras.codecs.arrays.AbstractPrimitiveArrayCodec

deserialize, serialize

Methods inherited from class com.datastax.driver.extras.codecs.arrays.AbstractArrayCodec

format, parse

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

accepts, accepts, accepts, accepts, ascii, bigint, blob, cboolean, cdouble, cfloat, cint, counter, custom, date, decimal, getCqlType, getJavaType, inet, list, map, 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

Field Detail

instance

public static final DoubleArrayCodec instance

Constructor Detail

DoubleArrayCodec

public DoubleArrayCodec()

Method Detail

sizeOfComponentType

protected int sizeOfComponentType()

Description copied from class: AbstractPrimitiveArrayCodec

Return the size in bytes of the array component type.

Specified by:

sizeOfComponentType in class AbstractPrimitiveArrayCodec<double[]>

Returns:

the size in bytes of the array component type.

serializeElement

protected void serializeElement(ByteBuffer output,
                                double[] array,
                                int index,
                                ProtocolVersion protocolVersion)

Description copied from class: AbstractPrimitiveArrayCodec

Write the indexth element of array to output.

Specified by:

serializeElement in class AbstractPrimitiveArrayCodec<double[]>

Parameters:

output - The ByteBuffer to write to.

array - The array to read from.

index - The element index.

protocolVersion - The protocol version to use.

deserializeElement

protected void deserializeElement(ByteBuffer input,
                                  double[] array,
                                  int index,
                                  ProtocolVersion protocolVersion)

Description copied from class: AbstractPrimitiveArrayCodec

Read the indexth element of array from input.

Specified by:

deserializeElement in class AbstractPrimitiveArrayCodec<double[]>

Parameters:

input - The ByteBuffer to read from.

array - The array to write to.

index - The element index.

protocolVersion - The protocol version to use.

formatElement

protected void formatElement(StringBuilder output,
                             double[] array,
                             int index)

Description copied from class: AbstractArrayCodec

Format the indexth element of array to output.

Specified by:

formatElement in class AbstractArrayCodec<double[]>

Parameters:

output - The StringBuilder to write to.

array - The array to read from.

index - The element index.

parseElement

protected void parseElement(String input,
                            double[] array,
                            int index)

Description copied from class: AbstractArrayCodec

Parse the indexth element of array from input.

Specified by:

parseElement in class AbstractArrayCodec<double[]>

Parameters:

input - The String to read from.

array - The array to write to.

index - The element index.

newInstance

protected double[] newInstance(int size)

Description copied from class: AbstractArrayCodec

Create a new array instance with the given size.

Specified by:

newInstance in class AbstractArrayCodec<double[]>

Parameters:

size - The size of the array to instantiate.

Returns:

a new array instance with the given size.