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1 /**
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2 * Copyright (c) Rich Hickey. All rights reserved.
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3 * The use and distribution terms for this software are covered by the
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4 * Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
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5 * which can be found in the file epl-v10.html at the root of this distribution.
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6 * By using this software in any fashion, you are agreeing to be bound by
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7 * the terms of this license.
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8 * You must not remove this notice, or any other, from this software.
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9 **/
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10
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11 /* rich Mar 25, 2006 11:42:47 AM */
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12
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13 package clojure.lang;
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14
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15 import java.io.Serializable;
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16 import java.io.ObjectStreamException;
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17
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18
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19 public class Symbol extends AFn implements IObj, Comparable, Named, Serializable{
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20 //these must be interned strings!
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21 final String ns;
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22 final String name;
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23 final int hash;
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24 final IPersistentMap _meta;
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25
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26 public String toString(){
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27 if(ns != null)
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28 return ns + "/" + name;
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29 return name;
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30 }
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31
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32 public String getNamespace(){
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33 return ns;
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34 }
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35
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36 public String getName(){
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37 return name;
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38 }
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39
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40 static public Symbol intern(String ns, String name){
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41 return new Symbol(ns == null ? null : ns.intern(), name.intern());
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42 }
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43
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44 static public Symbol intern(String nsname){
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45 int i = nsname.lastIndexOf('/');
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46 if(i == -1 || nsname.equals("/"))
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47 return new Symbol(null, nsname.intern());
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48 else
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49 return new Symbol(nsname.substring(0, i).intern(), nsname.substring(i + 1).intern());
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50 }
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51
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52 static public Symbol create(String name_interned){
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53 return new Symbol(null, name_interned);
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54 }
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55
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56 static public Symbol create(String ns_interned, String name_interned){
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57 return new Symbol(ns_interned, name_interned);
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58 }
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59
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60 private Symbol(String ns_interned, String name_interned){
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61 this.name = name_interned;
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62 this.ns = ns_interned;
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63 this.hash = Util.hashCombine(name.hashCode(), Util.hash(ns));
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64 this._meta = null;
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65 }
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66
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67 public boolean equals(Object o){
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68 if(this == o)
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69 return true;
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70 if(!(o instanceof Symbol))
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71 return false;
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72
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73 Symbol symbol = (Symbol) o;
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74
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75 //identity compares intended, names are interned
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76 return name == symbol.name && ns == symbol.ns;
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77 }
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78
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79 public int hashCode(){
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80 return hash;
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81 }
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82
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83 public IObj withMeta(IPersistentMap meta){
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84 return new Symbol(meta, ns, name);
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85 }
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86
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87 private Symbol(IPersistentMap meta, String ns, String name){
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88 this.name = name;
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89 this.ns = ns;
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90 this._meta = meta;
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91 this.hash = Util.hashCombine(name.hashCode(), Util.hash(ns));
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92 }
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93
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94 public int compareTo(Object o){
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95 Symbol s = (Symbol) o;
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96 if(this.equals(o))
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97 return 0;
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98 if(this.ns == null && s.ns != null)
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99 return -1;
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100 if(this.ns != null)
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101 {
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102 if(s.ns == null)
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103 return 1;
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104 int nsc = this.ns.compareTo(s.ns);
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105 if(nsc != 0)
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106 return nsc;
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107 }
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108 return this.name.compareTo(s.name);
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109 }
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110
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111 private Object readResolve() throws ObjectStreamException{
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112 return intern(ns, name);
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113 }
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114
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115 public Object invoke(Object obj) throws Exception{
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116 return RT.get(obj, this);
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117 }
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118
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119 public Object invoke(Object obj, Object notFound) throws Exception{
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120 return RT.get(obj, this, notFound);
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121 }
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122
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123 public IPersistentMap meta(){
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124 return _meta;
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125 }
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126 }
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