org.hypergraphdb.query.impl

Class PredicateBasedFilter<T>

java.lang.Object

org.hypergraphdb.HGQuery<T>

org.hypergraphdb.query.impl.PredicateBasedFilter<T>

All Implemented Interfaces:

Iterable<HGQuery<T>>, HGGraphHolder

public final class PredicateBasedFilter<T>
extends HGQuery<T>
implements Iterable<HGQuery<T>>

A HGQuery whose result is constructed by filtering the result set of another HGQuery according to a HGQueryCondition.

Author:

Borislav Iordanov

Nested Class Summary

Nested classes/interfaces inherited from class org.hypergraphdb.HGQuery

HGQuery.hg

Field Summary

Fields inherited from class org.hypergraphdb.HGQuery

ctx, graph

Constructor Summary

Constructors

Constructor and Description
PredicateBasedFilter(HyperGraph graph, HGQuery<T> query, HGAtomPredicate atomPredicate) Construct a PredicateBasedFilter, filtering the result set of a given query based on a HGQueryCondition.
PredicateBasedFilter(HyperGraph graph, HGQuery<T> query, Mapping<T,Boolean> predicate)

Method Summary

Methods

Modifier and Type	Method and Description
HGSearchResult<T>	execute() Execute the query and return the result set.
HGQuery<T>	getQuery()
Iterator<HGQuery<T>>	iterator()

Methods inherited from class org.hypergraphdb.HGQuery

compile, findAll, findInSet, findOne, getHyperGraph, initialValue, initialVar, make, make, NOP, setHyperGraph, var, var

Methods inherited from class java.lang.Object

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

Constructor Detail

PredicateBasedFilter

public PredicateBasedFilter(HyperGraph graph,
                    HGQuery<T> query,
                    HGAtomPredicate atomPredicate)

Construct a PredicateBasedFilter, filtering the result set of a given query based on a HGQueryCondition.

Parameters:

query - The base query that is being filtered.

predicate - The filtering predicate.

PredicateBasedFilter

public PredicateBasedFilter(HyperGraph graph,
                    HGQuery<T> query,
                    Mapping<T,Boolean> predicate)

Method Detail

execute

public HGSearchResult<T> execute()

Description copied from class: HGQuery

Execute the query and return the result set. Note that queries are lazily executed so that results are actually obtained when one iterates (using the next and prev of the returned object).

Specified by:

execute in class HGQuery<T>

getQuery

public HGQuery<T> getQuery()

iterator

public Iterator<HGQuery<T>> iterator()

Specified by:

iterator in interface Iterable<HGQuery<T>>