org.apache.hadoop.hbase.types

类 Union3<A,B,C>

java.lang.Object

org.apache.hadoop.hbase.types.Union2<A,B>

org.apache.hadoop.hbase.types.Union3<A,B,C>

所有已实现的接口:

DataType<Object>

直接已知子类:

Union4

@InterfaceAudience.Public
@InterfaceStability.Evolving
public abstract class Union3<A,B,C>
extends Union2<A,B>

The Union family of DataTypes encode one of a fixed collection of Objects. They provide convenience methods which handle type casting on your behalf.

另请参阅:

Union2

字段概要

字段

限定符和类型	字段和说明
protected DataType<C>	typeC

从类继承的字段 org.apache.hadoop.hbase.types.Union2

typeA, typeB

构造器概要

构造器

构造器和说明
Union3(DataType<A> typeA, DataType<B> typeB, DataType<C> typeC) Create an instance of Union3 over the set of specified types.

方法概要

方法

限定符和类型	方法和说明
C	decodeC(PositionedByteRange src) Read an instance of the third type parameter from buffer src.
Order	getOrder() Retrieve the sort Order imposed by this data type, or null when natural ordering is not preserved.
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.

从类继承的方法 org.apache.hadoop.hbase.types.Union2

decodeA, decodeB, encodedClass

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, encodedLength, skip

字段详细资料

typeC

protected final DataType<C> typeC

构造器详细资料

Union3

public Union3(DataType<A> typeA,
      DataType<B> typeB,
      DataType<C> typeC)

Create an instance of Union3 over the set of specified types.

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<Object>

覆盖:

isOrderPreserving 在类中 Union2<A,B>

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<Object>

覆盖:

getOrder 在类中 Union2<A,B>

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<Object>

覆盖:

isNullable 在类中 Union2<A,B>

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<Object>

覆盖:

isSkippable 在类中 Union2<A,B>

decodeC

public C decodeC(PositionedByteRange src)

Read an instance of the third type parameter from buffer src.