io.druid.segment

Class AbstractSegment

java.lang.Object

io.druid.segment.AbstractSegment

All Implemented Interfaces:

Segment, Closeable, AutoCloseable

Direct Known Subclasses:

IncrementalIndexSegment, QueryableIndexSegment, ReferenceCountingSegment

public abstract class AbstractSegment
extends Object
implements Segment

Constructor Summary

Constructors

Constructor and Description
AbstractSegment()

Method Summary

Modifier and Type	Method and Description
<T> T	as(Class<T> clazz) Request an implementation of a particular interface.

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.druid.segment.Segment

asQueryableIndex, asStorageAdapter, getDataInterval, getIdentifier

Methods inherited from interface java.io.Closeable

close

Constructor Detail

AbstractSegment

public AbstractSegment()

Method Detail

as

public <T> T as(Class<T> clazz)

Description copied from interface: Segment

Request an implementation of a particular interface. If the passed-in interface is QueryableIndex or StorageAdapter, then this method behaves identically to Segment.asQueryableIndex() or Segment.asStorageAdapter(). Other interfaces are only expected to be requested by callers that have specific knowledge of extra features provided by specific segment types. For example, an extension might provide a custom Segment type that can offer both StorageAdapter and some new interface. That extension can also offer a Query that uses that new interface. Implementations which accept classes other than QueryableIndex or StorageAdapter are limited to using those classes within the extension. This means that one extension cannot rely on the `Segment.as` behavior of another extension.

Specified by:

as in interface Segment

Type Parameters:

T - desired interface

Parameters:

clazz - desired interface

Returns:

instance of clazz, or null if the interface is not supported by this segment