org.calrissian.accumulorecipes.commons.iterators

Class FirstEntryInColumnIterator

java.lang.Object

org.apache.accumulo.core.iterators.WrappingIterator

org.apache.accumulo.core.iterators.SkippingIterator

org.calrissian.accumulorecipes.commons.iterators.FirstEntryInColumnIterator

All Implemented Interfaces:

org.apache.accumulo.core.iterators.OptionDescriber, org.apache.accumulo.core.iterators.SortedKeyValueIterator<org.apache.accumulo.core.data.Key,org.apache.accumulo.core.data.Value>

public class FirstEntryInColumnIterator
extends org.apache.accumulo.core.iterators.SkippingIterator
implements org.apache.accumulo.core.iterators.OptionDescriber

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.accumulo.core.iterators.OptionDescriber

org.apache.accumulo.core.iterators.OptionDescriber.IteratorOptions

Constructor Summary

Constructors

Constructor and Description
FirstEntryInColumnIterator()
FirstEntryInColumnIterator(FirstEntryInColumnIterator other, org.apache.accumulo.core.iterators.IteratorEnvironment env)

Method Summary

Methods

Modifier and Type	Method and Description
protected void	consume()
org.apache.accumulo.core.iterators.SortedKeyValueIterator<org.apache.accumulo.core.data.Key,org.apache.accumulo.core.data.Value>	deepCopy(org.apache.accumulo.core.iterators.IteratorEnvironment env)
org.apache.accumulo.core.iterators.OptionDescriber.IteratorOptions	describeOptions()
boolean	hasTop()
void	init(org.apache.accumulo.core.iterators.SortedKeyValueIterator<org.apache.accumulo.core.data.Key,org.apache.accumulo.core.data.Value> source, Map<String,String> options, org.apache.accumulo.core.iterators.IteratorEnvironment env)
void	seek(org.apache.accumulo.core.data.Range range, Collection<org.apache.accumulo.core.data.ByteSequence> columnFamilies, boolean inclusive)
static void	setNumScansBeforeSeek(org.apache.accumulo.core.client.IteratorSetting cfg, int num) convenience method to set the option to optimize the frequency of scans vs.
boolean	validateOptions(Map<String,String> options)

Methods inherited from class org.apache.accumulo.core.iterators.SkippingIterator

next

Methods inherited from class org.apache.accumulo.core.iterators.WrappingIterator

getSource, getTopKey, getTopValue, setSource

Methods inherited from class java.lang.Object

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

Constructor Detail

FirstEntryInColumnIterator

public FirstEntryInColumnIterator()

FirstEntryInColumnIterator

public FirstEntryInColumnIterator(FirstEntryInColumnIterator other,
                          org.apache.accumulo.core.iterators.IteratorEnvironment env)

Method Detail

setNumScansBeforeSeek

public static void setNumScansBeforeSeek(org.apache.accumulo.core.client.IteratorSetting cfg,
                         int num)

convenience method to set the option to optimize the frequency of scans vs. seeks

deepCopy

public org.apache.accumulo.core.iterators.SortedKeyValueIterator<org.apache.accumulo.core.data.Key,org.apache.accumulo.core.data.Value> deepCopy(org.apache.accumulo.core.iterators.IteratorEnvironment env)

Specified by:

deepCopy in interface org.apache.accumulo.core.iterators.SortedKeyValueIterator<org.apache.accumulo.core.data.Key,org.apache.accumulo.core.data.Value>

Overrides:

deepCopy in class org.apache.accumulo.core.iterators.WrappingIterator

init

public void init(org.apache.accumulo.core.iterators.SortedKeyValueIterator<org.apache.accumulo.core.data.Key,org.apache.accumulo.core.data.Value> source,
        Map<String,String> options,
        org.apache.accumulo.core.iterators.IteratorEnvironment env)
          throws IOException

Specified by:

init in interface org.apache.accumulo.core.iterators.SortedKeyValueIterator<org.apache.accumulo.core.data.Key,org.apache.accumulo.core.data.Value>

Overrides:

init in class org.apache.accumulo.core.iterators.WrappingIterator

Throws:

IOException

consume

protected void consume()
                throws IOException

Specified by:

consume in class org.apache.accumulo.core.iterators.SkippingIterator

Throws:

IOException

hasTop

public boolean hasTop()

Specified by:

hasTop in interface org.apache.accumulo.core.iterators.SortedKeyValueIterator<org.apache.accumulo.core.data.Key,org.apache.accumulo.core.data.Value>

Overrides:

hasTop in class org.apache.accumulo.core.iterators.WrappingIterator

seek

public void seek(org.apache.accumulo.core.data.Range range,
        Collection<org.apache.accumulo.core.data.ByteSequence> columnFamilies,
        boolean inclusive)
          throws IOException

Specified by:

seek in interface org.apache.accumulo.core.iterators.SortedKeyValueIterator<org.apache.accumulo.core.data.Key,org.apache.accumulo.core.data.Value>

Overrides:

seek in class org.apache.accumulo.core.iterators.SkippingIterator

Throws:

IOException

describeOptions

public org.apache.accumulo.core.iterators.OptionDescriber.IteratorOptions describeOptions()

Specified by:

describeOptions in interface org.apache.accumulo.core.iterators.OptionDescriber

validateOptions

public boolean validateOptions(Map<String,String> options)

Specified by:

validateOptions in interface org.apache.accumulo.core.iterators.OptionDescriber