Package org.apache.hadoop.ozone.container.metadata

Class AbstractDatanodeStore.KeyValueBlockLocalIdIterator

java.lang.Object

org.apache.hadoop.ozone.container.metadata.AbstractDatanodeStore.KeyValueBlockLocalIdIterator

All Implemented Interfaces:

Closeable, AutoCloseable, BlockIterator<Long>

Enclosing class:

AbstractDatanodeStore

@Public
public static class AbstractDatanodeStore.KeyValueBlockLocalIdIterator
extends Object
implements BlockIterator<Long>, Closeable

Block localId Iterator for KeyValue Container. This Block localId iterator returns localIds which match with the MetadataKeyFilters.KeyPrefixFilter.

Method Summary

Modifier and Type	Method	Description
void	close()
boolean	hasNext()	This checks if iterator has next element.
Long	nextBlock()	This method returns blocks matching with the filter.
void	seekToFirst()	Seek to first entry.
void	seekToLast()	Seek to last entry.

Methods inherited from class java.lang.Object

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

Method Details

nextBlock

public Long nextBlock()
               throws IOException,
NoSuchElementException

This method returns blocks matching with the filter.

Specified by:

nextBlock in interface BlockIterator<Long>

Returns:

next block local Id or null if no more block localIds

Throws:

IOException

NoSuchElementException

hasNext

public boolean hasNext()
                throws IOException

Description copied from interface: BlockIterator

This checks if iterator has next element. If it has returns true, otherwise false.

Specified by:

hasNext in interface BlockIterator<Long>

Returns:

boolean

Throws:

IOException

seekToFirst

public void seekToFirst()

Description copied from interface: BlockIterator

Seek to first entry.

Specified by:

seekToFirst in interface BlockIterator<Long>

seekToLast

public void seekToLast()

Description copied from interface: BlockIterator

Seek to last entry.

Specified by:

seekToLast in interface BlockIterator<Long>

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Throws:

IOException