src/org/biojava/dasobert/dasregistry/DasSourceComparator.java

   1 /*
   2  *                    BioJava development code
   3  *
   4  * This code may be freely distributed and modified under the
   5  * terms of the GNU Lesser General Public Licence.  This should
   6  * be distributed with the code.  If you do not have a copy,
   7  * see:
   8  *
   9  *      http://www.gnu.org/copyleft/lesser.html
  10  *
  11  * Copyright for this code is held jointly by the individual
  12  * authors.  These should be listed in @author doc comments.
  13  *
  14  * For more information on the BioJava project and its aims,
  15  * or to join the biojava-l mailing list, visit the home page
  16  * at:
  17  *
  18  *      http://www.biojava.org/
  19  *
  20  * Created on 15.04.2004
  21  * @author Andreas Prlic
  22  *
  23  */
  24
  25
  26 package org.biojava.dasobert.dasregistry ;
  27
  28 import java.util.Comparator ;
  29 import java.util.Map ;
  30 import java.util.HashMap ;
  31
  32
  33 /** a comparator to sort DasSources
  34  * @author Andreas Prlic, Thomas Down
  35  */
  36
  37
  38 public abstract class DasSourceComparator
  39     implements Comparator
  40 {
  41
  42     private final String name ;
  43     private static final Map COMPS_BY_NAME;
  44
  45
  46     public DasSourceComparator(String str) {
  47         //System.out.println("new dasSourceComparator " + str);
  48         name = str ;
  49     }
  50
  51     public static final Comparator BY_ID = new DasSourceComparator("id") {
  52         protected Comparable getField(DasSource ds) {
  53             return ds.getId();
  54         }
  55     };
  56
  57     public static final Comparator BY_NICKNAME = new DasSourceComparator("nickname") {
  58         protected Comparable getField(DasSource ds) {
  59             return ds.getNickname();
  60         }
  61     };
  62     public static final Comparator BY_REGISTER_DATE = new DasSourceComparator("registerdate") {
  63         protected Comparable getField(DasSource ds) {
  64             return ds.getRegisterDate();
  65         }
  66     };
  67     public static final Comparator BY_LEASE_DATE = new DasSourceComparator("leasedate") {
  68         protected Comparable getField(DasSource ds) {
  69             return ds.getLeaseDate();
  70         }
  71     };
  72     public static final Comparator BY_URL = new DasSourceComparator("url") {
  73         protected Comparable getField(DasSource ds) {
  74             return ds.getUrl();
  75         }
  76     };
  77     public static final Comparator BY_ADMIN_EMAIL = new DasSourceComparator("adminemail") {
  78         protected Comparable getField(DasSource ds) {
  79             return ds.getAdminemail();
  80         }
  81     };
  82     public static final Comparator BY_DESCRIPTION = new DasSourceComparator("description") {
  83         protected Comparable getField(DasSource ds) {
  84             return ds.getDescription();
  85         }
  86     };
  87     public static final Comparator BY_CAPABILITIES = new DasSourceComparator("capabilities") {
  88         protected Comparable getField(DasSource ds) {
  89             String[] caps = ds.getCapabilities();
  90             return caps.length == 0 ? "" : caps[0];
  91         }
  92     };
  93     public static final Comparator BY_COORDINATE_SYSTEM = new DasSourceComparator("coordinateSystem") {
  94         protected Comparable getField(DasSource ds) {
  95             DasCoordinateSystem[] dcss = ds.getCoordinateSystem();
  96             return dcss.length == 0 ? "" : dcss[0].toString();
  97         }
  98     };
  99
 100     static {
 101         COMPS_BY_NAME = new HashMap();
 102         COMPS_BY_NAME.put(BY_ID.toString(),                BY_ID);
 103         COMPS_BY_NAME.put(BY_NICKNAME.toString(),          BY_NICKNAME);
 104         COMPS_BY_NAME.put(BY_REGISTER_DATE.toString(),     BY_REGISTER_DATE);
 105         COMPS_BY_NAME.put(BY_LEASE_DATE.toString(),        BY_LEASE_DATE);
 106         COMPS_BY_NAME.put(BY_URL.toString(),               BY_URL);
 107         COMPS_BY_NAME.put(BY_ADMIN_EMAIL.toString(),       BY_ADMIN_EMAIL);
 108         COMPS_BY_NAME.put(BY_DESCRIPTION.toString(),       BY_DESCRIPTION);
 109         COMPS_BY_NAME.put(BY_CAPABILITIES.toString(),      BY_CAPABILITIES);
 110         COMPS_BY_NAME.put(BY_COORDINATE_SYSTEM.toString(), BY_COORDINATE_SYSTEM);
 111     }
 112
 113
 114
 115     public static Comparator fromString(String name) {
 116         if (COMPS_BY_NAME.containsKey(name)) {
 117             return (Comparator) COMPS_BY_NAME.get(name);
 118         } else {
 119             throw new IllegalArgumentException("Can't compare by key " + name);
 120         }
 121     }
 122
 123     protected abstract Comparable getField(DasSource ds);
 124
 125     /** compare two DasSource objects */
 126     public int compare( Object a, Object b) {
 127
 128         DasSource x = (DasSource) a ;
 129         DasSource y = (DasSource) b ;
 130         return getField(x).compareTo(getField(y));
 131     }
 132
 133     public String toString() {
 134         return name;
 135     }
 136
 137
 138 }
 139
 140