//******************************************************************************
//
// File:    Distance.java
// Package: edu.rit.compbio.phyl
// Unit:    Interface edu.rit.compbio.phyl.Distance
//
// This Java source file is copyright (C) 2008 by Alan Kaminsky. All rights
// reserved. For further information, contact the author, Alan Kaminsky, at
// ark@cs.rit.edu.
//
// This Java source file is part of the Parallel Java Library ("PJ"). PJ 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; either
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//******************************************************************************

package edu.rit.compbio.phyl;

/**
 * Interface Distance specifies the interface for an object that computes the
 * distance between two {@linkplain DnaSequence}s.
 *
 * @author  Alan Kaminsky
 * @version 23-Jul-2008
 */
public interface Distance
	{

// Exported operations.

	/**
	 * Compute the distance between the two given DNA sequences. It is assumed
	 * that the DNA sequences are the same length.
	 *
	 * @param  seq1  First DNA sequence.
	 * @param  seq2  Second DNA sequence.
	 *
	 * @return  Distance.
	 */
	public double distance
		(DnaSequence seq1,
		 DnaSequence seq2);

	}
