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 */
021
022package org.biojavax;
023import org.biojava.bio.symbol.Alphabet;
024import org.biojava.bio.symbol.FiniteAlphabet;
025import org.biojava.bio.symbol.SymbolList;
026import org.biojavax.bio.BioEntry;
027import org.biojavax.bio.seq.InfinitelyAmbiguousSymbolList;
028
029
030/**
031 * A simple implementation of CrossReferenceResolver.
032 * @author Richard Holland
033 * @author Mark Schreiber
034 * @since 1.5
035 */
036public class DummyCrossReferenceResolver implements CrossReferenceResolver {
037        
038    /**
039     * {@inheritDoc}
040     * All responses are instances of InfinitelyAmbiguousSymbolList.
041     */
042    public SymbolList getRemoteSymbolList(CrossRef cr, Alphabet a) {
043        if (!(a instanceof FiniteAlphabet)) throw new IllegalArgumentException("Cannot construct dummy symbol list for a non-finite alphabet");
044        return new InfinitelyAmbiguousSymbolList((FiniteAlphabet)a);
045    }
046    
047    /**
048     * {@inheritDoc}
049     * All responses are null.
050     */
051    public BioEntry getRemoteBioEntry(CrossRef cr){
052        return null;
053    }
054}
055