Package org.apache.hadoop.hbase.types

Class Union4<A,B,C,D>

java.lang.Object

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

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

org.apache.hadoop.hbase.types.Union4<A,B,C,D>

All Implemented Interfaces:

DataType<Object>

@Public
public abstract class Union4<A,B,C,D>
extends Union3<A,B,C>

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

Field Summary

Fields

Modifier and Type	Field	Description
protected final DataType<D>	typeD

Fields inherited from class org.apache.hadoop.hbase.types.Union3

typeC

Fields inherited from class org.apache.hadoop.hbase.types.Union2

typeA, typeB

Constructor Summary

Constructors

Constructor	Description
Union4(DataType<A> typeA, DataType<B> typeB, DataType<C> typeC, DataType<D> typeD)	Create an instance of Union4 over the set of specified types.

Method Summary

Modifier and Type	Method	Description
D	decodeD(PositionedByteRange src)	Read an instance of the fourth 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.

Methods inherited from class org.apache.hadoop.hbase.types.Union3

decodeC

Methods inherited from class org.apache.hadoop.hbase.types.Union2

decodeA, decodeB, encodedClass

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, encodedLength, skip

Field Details

typeD

protected final DataType<D> typeD

Constructor Details

Union4

public Union4(DataType<A> typeA,
 DataType<B> typeB,
 DataType<C> typeC,
 DataType<D> typeD)

Create an instance of Union4 over the set of specified types.

Method Details

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<A>

Overrides:

isOrderPreserving in class Union3<A,B,C>

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<A>

Overrides:

getOrder in class Union3<A,B,C>

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<A>

Overrides:

isNullable in class Union3<A,B,C>

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<A>

Overrides:

isSkippable in class Union3<A,B,C>

decodeD

public D decodeD(PositionedByteRange src)

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