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.segment.file.SegmentFileBuilder) call.
ValueType	getValueType()
boolean	isHasMultipleValues()
BaseColumnHolder	read(ByteBuffer buffer, ColumnConfig columnConfig, SegmentFileMapper segmentFileMapper, ColumnHolder parent)
void	writeTo(WritableByteChannel channel, SegmentFileBuilder fileBuilder)	Writes the serialized form of this object.

Methods inherited from class java.lang.Object

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

Constructor Details

ColumnDescriptor

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

Method Details

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.segment.file.SegmentFileBuilder) call.

Specified by:

getSerializedSize in interface Serializer

Throws:

IOException

writeTo

public void writeTo(WritableByteChannel channel,
 SegmentFileBuilder fileBuilder)
             throws IOException

Description copied from interface: Serializer

Writes the serialized form of this object. The entire object may be written to the provided channel, or the object may be split over the provided channel and files added to the {@link SegmentFileBuilder], where additional channels can be created via SegmentFileBuilder.addWithChannel(String, long). The latter approach is useful when the serialized form of the object is too large for a single smoosh container. At the time this javadoc was written, the max smoosh container size is limit to the max ByteBuffer size.

Specified by:

writeTo in interface Serializer

Throws:

IOException

read

public BaseColumnHolder read(ByteBuffer buffer,
 ColumnConfig columnConfig,
 SegmentFileMapper segmentFileMapper,
 @Nullable
 ColumnHolder parent)