com.bigdata.bop.ap.filter

Class DistinctFilter

java.lang.Object

com.bigdata.bop.CoreBaseBOp

com.bigdata.bop.BOpBase

com.bigdata.bop.ap.filter.BOpFilterBase

com.bigdata.bop.ap.filter.DistinctFilter

All Implemented Interfaces:

BOp, IFilter, IPropertySet, Serializable, Cloneable

public class DistinctFilter
extends BOpFilterBase

A DISTINCT operator based for elements in a relation. The operator is based on an in-memory hash table.

Note: This is used for the in-memory SPO distinct filter, but it is more general and can be applied to any data type that can be inserted into a set.

Version:

$Id: DistinctElementFilter.java 3466 2010-08-27 14:28:04Z thompsonbry $

Author:

Bryan Thompson

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	DistinctFilter.Annotations
static class	DistinctFilter.DistinctFilterImpl DISTINCT filter based on Java heap data structures.

Field Summary

Fields inherited from class com.bigdata.bop.CoreBaseBOp

DEFAULT_INITIAL_CAPACITY

Fields inherited from interface com.bigdata.bop.BOp

NOANNS, NOARGS

Constructor Summary

Constructors

Constructor and Description
DistinctFilter(BOp[] args, Map<String,Object> annotations) Required shallow copy constructor.
DistinctFilter(DistinctFilter op) Constructor required for com.bigdata.bop.BOpUtility#deepCopy(FilterNode).

Method Summary

Methods

Modifier and Type	Method and Description
protected Iterator	filterOnce(Iterator src, Object context) Wrap the source iterator with this filter.
static DistinctFilter	newInstance() A instance using the default configuration for the in memory hash map.

Methods inherited from class com.bigdata.bop.ap.filter.BOpFilterBase

filter

Methods inherited from class com.bigdata.bop.BOpBase

__replaceArg, _clearProperty, _set, _setProperty, annotations, annotationsCopy, annotationsEqual, annotationsRef, argIterator, args, argsCopy, arity, clearAnnotations, clearProperty, deepCopy, deepCopy, get, getProperty, setArg, setProperty, setUnboundProperty, toArray, toArray

Methods inherited from class com.bigdata.bop.CoreBaseBOp

annotationsEqual, annotationsToString, annotationsToString, annotationValueToString, checkArgs, clone, equals, getEvaluationContext, getId, getProperty, getRequiredProperty, hashCode, indent, isController, mutation, shortenName, toShortString, toString, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface cutthecrap.utils.striterators.IPropertySet

getProperty

Constructor Detail

DistinctFilter

public DistinctFilter(DistinctFilter op)

Constructor required for com.bigdata.bop.BOpUtility#deepCopy(FilterNode).

DistinctFilter

public DistinctFilter(BOp[] args,
              Map<String,Object> annotations)

Required shallow copy constructor.

Method Detail

newInstance

public static DistinctFilter newInstance()

A instance using the default configuration for the in memory hash map.

filterOnce

protected final Iterator filterOnce(Iterator src,
                  Object context)

Description copied from class: BOpFilterBase

Wrap the source iterator with this filter.

Specified by:

filterOnce in class BOpFilterBase

Parameters:

src - The source iterator.

context - The iterator evaluation context.

Returns:

The wrapped iterator.