org.apache.hadoop.hbase.types

类 Union2<A,B>

java.lang.Object

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

所有已实现的接口:

DataType<Object>

直接已知子类:

Union3

@InterfaceAudience.Public
public abstract class Union2<A,B>
extends Object
implements DataType<Object>

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

字段概要

字段

限定符和类型	字段和说明
protected DataType<A>	typeA
protected DataType<B>	typeB

构造器概要

构造器

构造器和说明
Union2(DataType<A> typeA, DataType<B> typeB) Create an instance of Union2 over the set of specified types.

方法概要

限定符和类型	方法和说明
A	decodeA(PositionedByteRange src) Read an instance of the first type parameter from buffer src.
B	decodeB(PositionedByteRange src) Read an instance of the second type parameter from buffer src.
Class<Object>	encodedClass() Inform consumers over what type this DataType operates.
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 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

typeA

protected final DataType<A> typeA

typeB

protected final DataType<B> typeB

构造器详细资料

Union2

public Union2(DataType<A> typeA,
              DataType<B> typeB)

Create an instance of Union2 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>

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>

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>

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>

encodedClass

public Class<Object> encodedClass()

从接口复制的说明: DataType

Inform consumers over what type this DataType operates. Useful when working with bare DataType instances.

指定者:

encodedClass 在接口中 DataType<Object>

decodeA

public A decodeA(PositionedByteRange src)

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

decodeB

public B decodeB(PositionedByteRange src)

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