/*
 *                    BioJava development code
 *
 * This code may be freely distributed and modified under the
 * terms of the GNU Lesser General Public Licence.  This should
 * be distributed with the code.  If you do not have a copy,
 * see:
 *
 *      http://www.gnu.org/copyleft/lesser.html
 *
 * Copyright for this code is held jointly by the individual
 * authors.  These should be listed in @author doc comments.
 *
 * For more information on the BioJava project and its aims,
 * or to join the biojava-l mailing list, visit the home page
 * at:
 *
 *      http://www.biojava.org/
 *
 * Created on 15.04.2004
 * @author Andreas Prlic
 *
 */

package org.biojava.dasobert.dasregistry;

import java.util.*;

/**
 * a comparator to sort DasSources
 * 
 * @author Andreas Prlic
 */

public abstract class DasCoordSysComparator implements Comparator
{

  private final String name;

  private static final Map COMPS_BY_NAME;

  public DasCoordSysComparator(String str)
  {
    // System.out.println("new dasSourceComparator " + str);
    name = str;
  }

  public static final Comparator BY_NAME = new DasCoordSysComparator("name")
  {
    protected Comparable getField(DasCoordinateSystem ds)
    {
      return ds.getName();
    }
  };

  public static final Comparator BY_ID = new DasCoordSysComparator("id")
  {
    protected Comparable getField(DasCoordinateSystem ds)
    {
      return ds.getUniqueId();
    }
  };

  public static final Comparator BY_CATEGORY = new DasCoordSysComparator(
          "category")
  {
    protected Comparable getField(DasCoordinateSystem ds)
    {
      return ds.getCategory();
    }
  };

  public static final Comparator BY_ORGANISM = new DasCoordSysComparator(
          "organism")
  {
    protected Comparable getField(DasCoordinateSystem ds)
    {
      return ds.getOrganismName();
    }
  };

  public static final Comparator BY_TAXID = new DasCoordSysComparator(
          "taxid")
  {
    protected Comparable getField(DasCoordinateSystem ds)
    {
      return ds.getNCBITaxId() + "";
    }
  };

  static
  {
    COMPS_BY_NAME = new HashMap();
    COMPS_BY_NAME.put(BY_ID.toString(), BY_ID);
    COMPS_BY_NAME.put(BY_NAME.toString(), BY_NAME);
    COMPS_BY_NAME.put(BY_CATEGORY.toString(), BY_CATEGORY);
    COMPS_BY_NAME.put(BY_ORGANISM.toString(), BY_ORGANISM);
    COMPS_BY_NAME.put(BY_TAXID.toString(), BY_TAXID);
  }

  public static Comparator fromString(String name)
  {
    if (COMPS_BY_NAME.containsKey(name))
    {
      return (Comparator) COMPS_BY_NAME.get(name);
    }
    else
    {
      throw new IllegalArgumentException("Can't compare by key " + name);
    }
  }

  protected abstract Comparable getField(DasCoordinateSystem ds);

  /** compare two DasCoordSys objects */
  public int compare(Object a, Object b)
  {
    DasCoordinateSystem x = (DasCoordinateSystem) a;
    DasCoordinateSystem y = (DasCoordinateSystem) b;
    return getField(x).compareTo(getField(y));
  }

  public String toString()
  {
    return name;
  }

}