Package org.apache.druid.segment.column

Class ColumnDescriptor

java.lang.Object

org.apache.druid.segment.column.ColumnDescriptor

All Implemented Interfaces:

Serializer

public class ColumnDescriptor
extends Object
implements Serializer

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ColumnDescriptor.Builder

Constructor Summary

Constructors

Constructor	Description
ColumnDescriptor(ValueType valueType, boolean hasMultipleValues, List<ColumnPartSerde> parts)

Method Summary

Modifier and Type	Method	Description
static ColumnDescriptor.Builder	builder()
List<ColumnPartSerde>	getParts()
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.
ValueType	getValueType()
boolean	isHasMultipleValues()
ColumnHolder	read(ByteBuffer buffer, ColumnConfig columnConfig, SmooshedFileMapper smooshedFiles)
void	writeTo(WritableByteChannel channel, FileSmoosher smoosher)	Writes serialized form of this object to the given channel.

Methods inherited from class java.lang.Object

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

Constructor Detail

ColumnDescriptor

public ColumnDescriptor(ValueType valueType,
                        boolean hasMultipleValues,
                        List<ColumnPartSerde> parts)

Method Detail

builder

public static ColumnDescriptor.Builder builder()

getValueType

public ValueType getValueType()

isHasMultipleValues

public boolean isHasMultipleValues()

getParts

public List<ColumnPartSerde> getParts()

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

read

public ColumnHolder read(ByteBuffer buffer,
                         ColumnConfig columnConfig,
                         SmooshedFileMapper smooshedFiles)