org.apache.hadoop.hbase.types

类 PBType<T extends com.google.protobuf.Message>

java.lang.Object

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

所有已实现的接口:

DataType<T>

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

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

构造器概要

构造器

构造器和说明
PBType()

方法概要

方法

限定符和类型	方法和说明
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 com.google.protobuf.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 com.google.protobuf.CodedOutputStream	outputStreamFromByteRange(PositionedByteRange dst) Create a CodedOutputStream from a PositionedByteRange.

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.hadoop.hbase.types.DataType

decode, encode, encodedClass, skip

构造器详细资料

PBType

public PBType()

方法详细资料

isOrderPreserving

public boolean isOrderPreserving()

从接口复制的说明: DataType

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

指定者:

isOrderPreserving 在接口中 DataType<T extends com.google.protobuf.Message>

返回:

true when natural order is preserved, false otherwise.

getOrder

public Order getOrder()

从接口复制的说明: 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.

指定者:

getOrder 在接口中 DataType<T extends com.google.protobuf.Message>

isNullable

public boolean isNullable()

从接口复制的说明: 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.

指定者:

isNullable 在接口中 DataType<T extends com.google.protobuf.Message>

返回:

true when null is supported, false otherwise.

isSkippable

public boolean isSkippable()

从接口复制的说明: 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.

指定者:

isSkippable 在接口中 DataType<T extends com.google.protobuf.Message>

encodedLength

public int encodedLength(T val)

从接口复制的说明: DataType

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

指定者:

encodedLength 在接口中 DataType<T extends com.google.protobuf.Message>

参数:

val - The value to check.

返回:

the number of bytes required to encode val.a

inputStreamFromByteRange

public static com.google.protobuf.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 com.google.protobuf.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);