org.apache.druid.segment.data

Class FrontCodedIntArrayIndexedWriter

java.lang.Object

org.apache.druid.segment.data.FrontCodedIntArrayIndexedWriter

All Implemented Interfaces:

DictionaryWriter<int[]>, Serializer

public class FrontCodedIntArrayIndexedWriter
extends Object
implements DictionaryWriter<int[]>

Field Summary

Fields

Modifier and Type	Field and Description
static Comparator<int[]>	ARRAY_COMPARATOR

Constructor Summary

Constructors

Constructor and Description
FrontCodedIntArrayIndexedWriter(SegmentWriteOutMedium segmentWriteOutMedium, ByteOrder byteOrder, int bucketSize)

Method Summary

Modifier and Type	Method and Description
int[]	get(int index)
int	getCardinality()
long	getSerializedSize() Returns the number of bytes, that this Serializer will write to the output _channel_ (not smoosher) on a Serializer.writeTo(java.nio.channels.WritableByteChannel, org.apache.druid.java.util.common.io.smoosh.FileSmoosher) call.
boolean	isSorted()
void	open()
void	write(int[] value)
static int	writeBucket(ByteBuffer buffer, int[][] values, int numValues) Write bucket of values to a ByteBuffer.
void	writeTo(WritableByteChannel channel, FileSmoosher smoosher) Writes serialized form of this object to the given channel.
static int	writeValue(ByteBuffer buffer, int[] ints) Write a variable length int[] value to a ByteBuffer, storing the length as a VByte encoded integer followed by the value itself.

Methods inherited from class java.lang.Object

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

Field Detail

ARRAY_COMPARATOR

public static final Comparator<int[]> ARRAY_COMPARATOR

Constructor Detail

FrontCodedIntArrayIndexedWriter

public FrontCodedIntArrayIndexedWriter(SegmentWriteOutMedium segmentWriteOutMedium,
                                       ByteOrder byteOrder,
                                       int bucketSize)

Method Detail

open

public void open()
          throws IOException

Specified by:

open in interface DictionaryWriter<int[]>

Throws:

IOException

write

public void write(@Nullable
                  int[] value)
           throws IOException

Specified by:

write in interface DictionaryWriter<int[]>

Throws:

IOException

getSerializedSize

public long getSerializedSize()
                       throws IOException

Description copied from interface: Serializer

Returns the number of bytes, that this Serializer will write to the output _channel_ (not smoosher) on a Serializer.writeTo(java.nio.channels.WritableByteChannel, org.apache.druid.java.util.common.io.smoosh.FileSmoosher) call.

Specified by:

getSerializedSize in interface Serializer

Throws:

IOException

writeTo

public void writeTo(WritableByteChannel channel,
                    FileSmoosher smoosher)
             throws IOException

Description copied from interface: Serializer

Writes serialized form of this object to the given channel. If parallel data streams are needed, they could be created with the provided smoosher.

Specified by:

writeTo in interface Serializer

Throws:

IOException

isSorted

public boolean isSorted()

Specified by:

isSorted in interface DictionaryWriter<int[]>

get

@Nullable
public int[] get(int index)
                    throws IOException

Specified by:

get in interface DictionaryWriter<int[]>

Throws:

IOException

getCardinality

public int getCardinality()

Specified by:

getCardinality in interface DictionaryWriter<int[]>

writeBucket

public static int writeBucket(ByteBuffer buffer,
                              int[][] values,
                              int numValues)

Write bucket of values to a ByteBuffer. The first value is written completely, subsequent values are written with an integer to indicate how much of the first value in the bucket is a prefix of the value, followed by the remaining bytes of the value. Uses VByte encoded integers to indicate prefix length and value length.

writeValue

public static int writeValue(ByteBuffer buffer,
                             int[] ints)

Write a variable length int[] value to a ByteBuffer, storing the length as a VByte encoded integer followed by the value itself. Returns the number of bytes written to the buffer. This method returns a negative value if there is no room available in the buffer, so that it can be grown if needed.