org.apache.accumulo.examples.simple.filedata

Class ChunkCombiner

java.lang.Object

org.apache.accumulo.examples.simple.filedata.ChunkCombiner

All Implemented Interfaces:

SortedKeyValueIterator<Key,Value>

public class ChunkCombiner
extends Object
implements SortedKeyValueIterator<Key,Value>

This iterator dedupes chunks and sets their visibilities to the combined visibility of the refs columns. For example, it would combine

    row1 refs uid1\0a A&B V0
    row1 refs uid2\0b C&D V0
    row1 ~chunk 0 A&B V1
    row1 ~chunk 0 C&D V1
    row1 ~chunk 0 E&F V1
    row1 ~chunk 0 G&H V1
 

into the following

    row1 refs uid1\0a A&B V0
    row1 refs uid2\0b C&D V0
    row1 ~chunk 0 (A&B)|(C&D) V1
 

VisibilityCombiner is used to combie the visibilities.

Constructor Summary

Constructors

Constructor and Description
ChunkCombiner()

Method Summary

Methods

Modifier and Type	Method and Description
SortedKeyValueIterator<Key,Value>	deepCopy(IteratorEnvironment env)
Key	getTopKey()
Value	getTopValue()
boolean	hasTop()
void	init(SortedKeyValueIterator<Key,Value> source, Map<String,String> options, IteratorEnvironment env)
void	next()
void	seek(Range range, Collection<ByteSequence> columnFamilies, boolean inclusive)

Methods inherited from class java.lang.Object

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

Constructor Detail

ChunkCombiner

public ChunkCombiner()

Method Detail

init

public void init(SortedKeyValueIterator<Key,Value> source,
        Map<String,String> options,
        IteratorEnvironment env)
          throws IOException

Specified by:

init in interface SortedKeyValueIterator<Key,Value>

Throws:

IOException

hasTop

public boolean hasTop()

Specified by:

hasTop in interface SortedKeyValueIterator<Key,Value>

next

public void next()
          throws IOException

Specified by:

next in interface SortedKeyValueIterator<Key,Value>

Throws:

IOException

seek

public void seek(Range range,
        Collection<ByteSequence> columnFamilies,
        boolean inclusive)
          throws IOException

Specified by:

seek in interface SortedKeyValueIterator<Key,Value>

Throws:

IOException

getTopKey

public Key getTopKey()

Specified by:

getTopKey in interface SortedKeyValueIterator<Key,Value>

getTopValue

public Value getTopValue()

Specified by:

getTopValue in interface SortedKeyValueIterator<Key,Value>

deepCopy

public SortedKeyValueIterator<Key,Value> deepCopy(IteratorEnvironment env)

Specified by:

deepCopy in interface SortedKeyValueIterator<Key,Value>