org.hypergraphdb.query.impl

Class IndexBasedQuery<T>

java.lang.Object

org.hypergraphdb.HGQuery<T>

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

All Implemented Interfaces:

HGGraphHolder

public class IndexBasedQuery<T>
extends HGQuery<T>

A simple query that operates on a single index.

Author:

Borislav Iordanov

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	IndexBasedQuery.ScanType

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
IndexBasedQuery(HGIndex<? extends Object,? extends Object> index, Object key)
IndexBasedQuery(HGIndex<Object,Object> index, IndexBasedQuery.ScanType scanType) Construct a query that will scan the whole index - either its keys or its values depending on the scanKeys parameter.
IndexBasedQuery(HGIndex<Object,Object> index, Object key, ComparisonOperator operator)
IndexBasedQuery(HGIndex<Object,Object> index, Ref<Object> key, ComparisonOperator operator)

Method Summary

Methods

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

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

IndexBasedQuery

public IndexBasedQuery(HGIndex<Object,Object> index,
               IndexBasedQuery.ScanType scanType)

Construct a query that will scan the whole index - either its keys or its values depending on the scanKeys parameter.

Parameters:

index - The HGIndex on which the query is performed.

scanKeys - true if all keys must be scanned and false if all values must be scanned instead.

IndexBasedQuery

public IndexBasedQuery(HGIndex<? extends Object,? extends Object> index,
               Object key)

IndexBasedQuery

public IndexBasedQuery(HGIndex<Object,Object> index,
               Ref<Object> key,
               ComparisonOperator operator)

IndexBasedQuery

public IndexBasedQuery(HGIndex<Object,Object> index,
               Object key,
               ComparisonOperator operator)

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>