/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at legal-notices/CDDLv1_0.txt
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* or http://forgerock.org/license/CDDLv1.0.html.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at legal-notices/CDDLv1_0.txt.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2009-2010 Sun Microsystems, Inc.
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* Portions Copyright 2014 ForgeRock AS
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*/
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package org.opends.server.backends.jeb;
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import java.util.Collection;
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import org.forgerock.i18n.LocalizableMessageBuilder;
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import static org.opends.server.backends.jeb.IndexFilter.*;
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/**
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* This class represents a JE Backend Query.
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*/
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@org.opends.server.types.PublicAPI(
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stability = org.opends.server.types.StabilityLevel.VOLATILE,
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mayInstantiate = false,
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mayExtend = true,
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mayInvoke = false)
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public abstract class IndexQuery
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{
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/**
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* Evaluates the index query and returns the EntryIDSet.
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*
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* @param debugMessage If not null, diagnostic message will be written
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* which will help to determine why the returned
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* EntryIDSet is not defined.
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* @return The EntryIDSet as a result of evaluation of this query.
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*/
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public abstract EntryIDSet evaluate(LocalizableMessageBuilder debugMessage);
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/**
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* Creates an IntersectionIndexQuery object from a collection of
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* IndexQuery objects.
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*
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* @param subIndexQueries
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* A collection of IndexQuery objects.
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* @return An IntersectionIndexQuery object.
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*/
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public static IndexQuery createIntersectionIndexQuery(
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Collection<IndexQuery> subIndexQueries)
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{
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return new IntersectionIndexQuery(subIndexQueries);
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}
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/**
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* Creates a union IndexQuery object from a collection of IndexQuery
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* objects.
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*
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* @param subIndexQueries
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* Collection of IndexQuery objects.
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* @return A UnionIndexQuery object.
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*/
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public static IndexQuery createUnionIndexQuery(
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Collection<IndexQuery> subIndexQueries)
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{
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return new UnionIndexQuery(subIndexQueries);
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}
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/**
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* Creates an empty IndexQuery object.
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*
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* @return A NullIndexQuery object.
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*/
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public static IndexQuery createNullIndexQuery()
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{
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return new NullIndexQuery();
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}
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/**
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* This class creates a Null IndexQuery. It is used when there is no
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* record in the index. It may also be used when the index contains
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* all the records but an empty EntryIDSet should be returned as part
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* of the optimization.
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*/
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private static final class NullIndexQuery extends IndexQuery
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{
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/** {@inheritDoc} */
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@Override
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public EntryIDSet evaluate(LocalizableMessageBuilder debugMessage)
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{
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return new EntryIDSet();
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}
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}
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/**
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* This class creates an intersection IndexQuery from a collection of
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* IndexQuery objects.
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*/
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private static final class IntersectionIndexQuery extends IndexQuery
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{
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/**
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* Collection of IndexQuery objects.
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*/
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private final Collection<IndexQuery> subIndexQueries;
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/**
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* Creates an instance of IntersectionIndexQuery.
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*
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* @param subIndexQueries
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* Collection of IndexQuery objects.
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*/
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private IntersectionIndexQuery(Collection<IndexQuery> subIndexQueries)
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{
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this.subIndexQueries = subIndexQueries;
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}
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/** {@inheritDoc} */
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@Override
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public EntryIDSet evaluate(LocalizableMessageBuilder debugMessage)
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{
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EntryIDSet entryIDs = null;
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for (IndexQuery query : subIndexQueries)
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{
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if (entryIDs == null)
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{
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entryIDs = query.evaluate(debugMessage);
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}
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else
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{
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entryIDs.retainAll(query.evaluate(debugMessage));
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}
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if (entryIDs.isDefined()
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&& entryIDs.size() <= FILTER_CANDIDATE_THRESHOLD)
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{
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break;
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}
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}
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return entryIDs;
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}
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}
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/**
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* This class creates a union of IndexQuery objects.
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*/
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private static final class UnionIndexQuery extends IndexQuery
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{
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/**
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* Collection containing IndexQuery objects.
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*/
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private final Collection<IndexQuery> subIndexQueries;
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/**
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* Creates an instance of UnionIndexQuery.
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*
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* @param subIndexQueries
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* The Collection of IndexQuery objects.
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*/
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private UnionIndexQuery(Collection<IndexQuery> subIndexQueries)
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{
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this.subIndexQueries = subIndexQueries;
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}
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/** {@inheritDoc} */
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@Override
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public EntryIDSet evaluate(LocalizableMessageBuilder debugMessage)
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{
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EntryIDSet entryIDs = null;
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for (IndexQuery query : subIndexQueries)
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{
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if (entryIDs == null)
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{
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entryIDs = query.evaluate(debugMessage);
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}
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else
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{
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entryIDs.addAll(query.evaluate(debugMessage));
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}
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if (entryIDs.isDefined()
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&& entryIDs.size() <= FILTER_CANDIDATE_THRESHOLD)
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{
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break;
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}
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}
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return entryIDs;
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}
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}
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}
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