001/*
002 *                    BioJava development code
003 *
004 * This code may be freely distributed and modified under the
005 * terms of the GNU Lesser General Public Licence.  This should
006 * be distributed with the code.  If you do not have a copy,
007 * see:
008 *
009 *      http://www.gnu.org/copyleft/lesser.html
010 *
011 * Copyright for this code is held jointly by the individual
012 * authors.  These should be listed in @author doc comments.
013 *
014 * For more information on the BioJava project and its aims,
015 * or to join the biojava-l mailing list, visit the home page
016 * at:
017 *
018 *      http://www.biojava.org/
019 *
020 */
021package org.biojava.nbio.core.alignment.matrices;
022
023/**
024 * Factory class to get Providers for substitution matrices that are provided by
025 * the AAINDEX database.
026 *
027 * @author Andreas Prlic
028 *
029 */
030public class AAindexFactory {
031
032        private static AAIndexProvider provider = null;
033
034        /**
035         * Gets singleton instance of an {@code AAIndexProvider}, always non-null
036         * 
037         * @return
038         */
039        public static AAIndexProvider getAAIndexProvider() {
040                if (provider == null)
041                        provider = new DefaultAAIndexProvider();
042                return provider;
043        }
044
045        /**
046         * Sets the singleton provider.
047         * @param provider
048         */
049        public static void setAAIndexProvider(AAIndexProvider provider) {
050                AAindexFactory.provider = provider;
051        }
052
053}