/**

Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016.  All rights reserved.

Contact:
     SYSTAP, LLC DBA Blazegraph
     2501 Calvert ST NW #106
     Washington, DC 20008
     licenses@blazegraph.com

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

package com.bigdata.rdf.internal;

import java.util.Iterator;

import org.openrdf.model.URI;

import com.bigdata.rdf.internal.impl.BlobIV;
import com.bigdata.rdf.model.BigdataURI;
import com.bigdata.rdf.model.BigdataValue;

/**
 * IExtensionFactories are responsible for enumerating what extensions are
 * supported for a particular database configuration.  Bigdata comes packaged
 * with a {@link SampleExtensionFactory} that supplies two starter extensions -
 * the {@link EpochExtension} (for representing time since the epoch as a long
 * integer) and the {@link ColorsEnumExtension} (a sample extension for how to
 * represent an enumeration via inline literals). 
 */
public interface IExtensionFactory {

    /**
     * This will be called very early in the IExtensionFactory lifecycle so that
     * the {@link BlobIV}s for the {@link IExtension}'s datatype URIs will be on
     * hand when needed. Also gets other relevant configuration information from
     * the lexicon such as whether or not to inline xsd:datetimes and what
     * timezone to use to do so.
     * 
     * @param resolver
     *            The interface used to resolve an {@link URI} to an
     *            {@link BigdataURI}.
     * @param config
     *            The {@link ILexiconConfiguration}.
     */
    void init(final IDatatypeURIResolver resolver,
            final ILexiconConfiguration<BigdataValue> config);

    /**
     * Return the supported extensions.
     */
    Iterator<IExtension<? extends BigdataValue>> getExtensions();
    
}