001    /**
002     * Copyright (c) 2010, SIB. All rights reserved.
003     * 
004     * SIB (Swiss Institute of Bioinformatics) - http://www.isb-sib.ch Host -
005     * https://sourceforge.net/projects/javaprotlib/
006     * 
007     * Redistribution and use in source and binary forms, with or without
008     * modification, are permitted provided that the following conditions are met:
009     * Redistributions of source code must retain the above copyright notice, this
010     * list of conditions and the following disclaimer. Redistributions in binary
011     * form must reproduce the above copyright notice, this list of conditions and
012     * the following disclaimer in the documentation and/or other materials provided
013     * with the distribution. Neither the name of the SIB/GENEBIO nor the names of
014     * its contributors may be used to endorse or promote products derived from this
015     * software without specific prior written permission.
016     * 
017     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
018     * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
019     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
020     * ARE DISCLAIMED. IN NO EVENT SHALL SIB/GENEBIO BE LIABLE FOR ANY DIRECT,
021     * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
022     * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
023     * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
024     * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
025     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
026     * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
027     */
028    package org.expasy.jpl.commons.collection;
029    
030    
031    /**
032     * The {@code Mappable} interface has to be implemented by all object that can
033     * be keyed in hash maps.
034     * 
035     * <p>
036     * TODO: We have to find another way to force the overrides of methods {@code
037     * equals()} and {@code hashCode()}.
038     * </p>
039     * 
040     * <p>
041     * By now, it is simply a tag interface as methods are already implemented in
042     * {@code Object} class.
043     * </p>
044     * 
045     * @author nikitin
046     * 
047     * @version 1.0
048     * 
049     */
050    public interface Mappable {
051            
052            /** @return true if equals */
053            boolean equals(Object o);
054            
055            /** @return the hash code of the object */
056            int hashCode();
057    }