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1 /*
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2 * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This
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3 * code is released under a tri EPL/GPL/LGPL license. You can use it,
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4 * redistribute it and/or modify it under the terms of the:
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5 *
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6 * Eclipse Public License version 1.0
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7 * GNU General Public License version 2
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8 * GNU Lesser General Public License version 2.1
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9 */
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10 package com.oracle.truffle.ruby.runtime.core;
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11
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12 import java.util.*;
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13
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14 import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
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15 import com.oracle.truffle.ruby.runtime.objects.*;
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16
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17 /**
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18 * Represents the Ruby {@code Hash} class.
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19 */
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20 public class RubyHash extends RubyObject {
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21
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22 /**
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23 * The class from which we create the object that is {@code Hash}. A subclass of
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24 * {@link RubyClass} so that we can override {@link #newInstance} and allocate a
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25 * {@link RubyHash} rather than a normal {@link RubyBasicObject}.
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26 */
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27 public static class RubyHashClass extends RubyClass {
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28
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29 public RubyHashClass(RubyClass objectClass) {
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30 super(null, objectClass, "Hash");
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31 }
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32
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33 @Override
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34 public RubyBasicObject newInstance() {
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35 return new RubyHash(this);
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36 }
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37
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38 }
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39
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40 public final Map<Object, Object> storage = new LinkedHashMap<>();
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41 @CompilationFinal public RubyProc defaultBlock = null;
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42
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43 public RubyHash(RubyClass rubyClass, RubyProc defaultBlock) {
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44 super(rubyClass);
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45 initialize(defaultBlock);
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46 }
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47
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48 public RubyHash(RubyClass rubyClass) {
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49 super(rubyClass);
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50 }
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51
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52 public void initialize(RubyProc setDefaultBlock) {
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53 defaultBlock = setDefaultBlock;
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54 }
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55
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56 @Override
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57 public Object dup() {
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58 final RubyHash newHash = new RubyHash(rubyClass);
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59 newHash.setInstanceVariables(getInstanceVariables());
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60 newHash.storage.putAll(storage);
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61 return newHash;
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62 }
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63
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64 public void put(Object key, Object value) {
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65 checkFrozen();
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66
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67 storage.put(key, value);
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68 }
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69
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70 public Object get(Object key) {
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71 return storage.get(key);
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72 }
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73
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74 public Map<Object, Object> getMap() {
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75 return storage;
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76 }
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77
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78 @Override
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79 public String toString() {
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80 final StringBuilder builder = new StringBuilder();
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81 builder.append("{");
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82
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83 for (Map.Entry<Object, Object> entry : storage.entrySet()) {
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84 if (builder.length() > 1) {
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85 builder.append(", ");
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86 }
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87
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88 builder.append(entry.getKey().toString());
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89 builder.append("=>");
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90 builder.append(entry.getValue().toString());
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91 }
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92
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93 builder.append("}");
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94 return builder.toString();
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95 }
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96
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97 @Override
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98 public int hashCode() {
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99 final int prime = 31;
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100 int result = 1;
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101 result = prime * result + ((storage == null) ? 0 : storage.hashCode());
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102 return result;
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103 }
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104
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105 @Override
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106 public boolean equals(Object obj) {
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107 if (this == obj) {
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108 return true;
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109 }
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110 if (obj == null) {
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111 return false;
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112 }
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113 if (!(obj instanceof RubyHash)) {
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114 return false;
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115 }
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116 RubyHash other = (RubyHash) obj;
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117 if (storage == null) {
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118 if (other.storage != null) {
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119 return false;
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120 }
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121 } else if (!storage.equals(other.storage)) {
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122 return false;
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123 }
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124 return true;
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125 }
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126
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127 }
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