org.apache.hadoop.hbase.types

Class PBType<T extends Message>

java.lang.Object

org.apache.hadoop.hbase.types.PBType<T>

All Implemented Interfaces:

DataType<T>

@InterfaceAudience.Public
@InterfaceStability.Evolving
public abstract class PBType<T extends Message>
extends Object
implements DataType<T>

A base-class for DataType implementations backed by protobuf. See PBKeyValue in hbase-examples module.

Constructor Summary

Constructors

Constructor and Description
PBType()

Method Summary

Methods

Modifier and Type	Method and Description
int	encodedLength(T val) Inform consumers how long the encoded byte[] will be.
Order	getOrder() Retrieve the sort Order imposed by this data type, or null when natural ordering is not preserved.
static CodedInputStream	inputStreamFromByteRange(PositionedByteRange src) Create a CodedInputStream from a PositionedByteRange.
boolean	isNullable() Indicates whether this instance supports encoding null values.
boolean	isOrderPreserving() Indicates whether this instance writes encoded byte[]'s which preserve the natural sort order of the unencoded value.
boolean	isSkippable() Indicates whether this instance is able to skip over it's encoded value.
static CodedOutputStream	outputStreamFromByteRange(PositionedByteRange dst) Create a CodedOutputStream from a PositionedByteRange.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.hbase.types.DataType

decode, encode, encodedClass, skip

Constructor Detail

PBType

public PBType()

Method Detail

isOrderPreserving

public boolean isOrderPreserving()

Description copied from interface: DataType

Indicates whether this instance writes encoded byte[]'s which preserve the natural sort order of the unencoded value.

Specified by:

isOrderPreserving in interface DataType<T extends Message>

Returns:

true when natural order is preserved, false otherwise.

getOrder

public Order getOrder()

Description copied from interface: DataType

Retrieve the sort Order imposed by this data type, or null when natural ordering is not preserved. Value is either ascending or descending. Default is assumed to be Order.ASCENDING.

Specified by:

getOrder in interface DataType<T extends Message>

isNullable

public boolean isNullable()

Description copied from interface: DataType

Indicates whether this instance supports encoding null values. This depends on the implementation details of the encoding format. All DataTypes that support null should treat null as comparing less than any non-null value for default sort ordering purposes.

Specified by:

isNullable in interface DataType<T extends Message>

Returns:

true when null is supported, false otherwise.

isSkippable

public boolean isSkippable()

Description copied from interface: DataType

Indicates whether this instance is able to skip over it's encoded value. DataTypes that are not skippable can only be used as the right-most field of a Struct.

Specified by:

isSkippable in interface DataType<T extends Message>

encodedLength

public int encodedLength(T val)

Description copied from interface: DataType

Inform consumers how long the encoded byte[] will be.

Specified by:

encodedLength in interface DataType<T extends Message>

Parameters:

val - The value to check.

Returns:

the number of bytes required to encode val.a

inputStreamFromByteRange

public static CodedInputStream inputStreamFromByteRange(PositionedByteRange src)

Create a CodedInputStream from a PositionedByteRange. Be sure to update src's position after consuming from the stream.

For example:

 Foo.Builder builder = ...
 CodedInputStream is = inputStreamFromByteRange(src);
 Foo ret = builder.mergeFrom(is).build();
 src.setPosition(src.getPosition() + is.getTotalBytesRead());
 

outputStreamFromByteRange

public static CodedOutputStream outputStreamFromByteRange(PositionedByteRange dst)

Create a CodedOutputStream from a PositionedByteRange. Be sure to update dst's position after writing to the stream.

For example:

 CodedOutputStream os = outputStreamFromByteRange(dst);
 int before = os.spaceLeft(), after, written;
 val.writeTo(os);
 after = os.spaceLeft();
 written = before - after;
 dst.setPosition(dst.getPosition() + written);