Mercurial Hosting > luan
annotate src/luan/LuanTable.java @ 72:cd9dbd7477ca
prevent stack overflow when printing table with circular references
git-svn-id: https://luan-java.googlecode.com/svn/trunk@73 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Tue, 12 Feb 2013 05:44:15 +0000 |
parents | f7e17cfb35f9 |
children | 4bf3d0c0b6b9 |
rev | line source |
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1
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1 package luan; |
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2 |
27
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3 import java.util.Iterator; |
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4 import java.util.ListIterator; |
1
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5 import java.util.Map; |
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6 import java.util.HashMap; |
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7 import java.util.List; |
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8 import java.util.ArrayList; |
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9 import java.util.Collections; |
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10 import java.util.Comparator; |
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11 import java.util.Set; |
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12 import java.util.HashSet; |
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prevent stack overflow when printing table with circular references
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13 import java.util.IdentityHashMap; |
1
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14 |
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15 |
48
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16 public class LuanTable { |
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17 private Map<Object,Object> map = null; |
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18 private List<Object> list = null; |
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19 private LuanTable metatable = null; |
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20 |
48
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21 public LuanTable() {} |
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22 |
48
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23 public LuanTable(List<Object> list) { |
44
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24 this.list = list; |
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25 } |
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26 |
48
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27 public LuanTable(Map<Object,Object> map) { |
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28 this.map = map; |
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29 } |
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30 |
48
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31 public LuanTable(Set<Object> set) { |
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32 map = new HashMap<Object,Object>(); |
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33 for( Object obj : set ) { |
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34 map.put(obj,Boolean.TRUE); |
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35 } |
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36 } |
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37 |
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38 public boolean isList() { |
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39 return map==null || map.isEmpty(); |
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40 } |
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41 |
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42 public List<Object> asList() { |
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43 return list!=null ? list : Collections.emptyList(); |
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44 } |
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45 |
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46 public Map<Object,Object> asMap() { |
47
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47 if( list == null || list.isEmpty() ) |
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48 return map!=null ? map : Collections.emptyMap(); |
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49 Map<Object,Object> rtn = map!=null ? new HashMap<Object,Object>(map) : new HashMap<Object,Object>(); |
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50 for( ListIterator iter = list.listIterator(); iter.hasNext(); ) { |
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51 int i = iter.nextIndex(); |
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52 rtn.put(i+1,iter.next()); |
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53 } |
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54 return rtn; |
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55 } |
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56 |
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57 public boolean isSet() { |
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58 if( list != null ) { |
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59 for( Object obj : list ) { |
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60 if( obj!=null && !obj.equals(Boolean.TRUE) ) |
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61 return false; |
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62 } |
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63 } |
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64 if( map != null ) { |
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65 for( Object obj : map.values() ) { |
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66 if( !obj.equals(Boolean.TRUE) ) |
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67 return false; |
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68 } |
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69 } |
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70 return true; |
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71 } |
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72 |
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73 public Set<Object> asSet() { |
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74 if( list == null || list.isEmpty() ) |
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75 return map!=null ? map.keySet() : Collections.emptySet(); |
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76 Set<Object> rtn = map!=null ? new HashSet<Object>(map.keySet()) : new HashSet<Object>(); |
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77 for( int i=1; i<=list.size(); i++ ) { |
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78 rtn.add(i); |
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79 } |
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80 return rtn; |
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81 } |
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82 |
1
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83 @Override public String toString() { |
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84 return toString( Collections.newSetFromMap(new IdentityHashMap<LuanTable,Boolean>()) ); |
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85 } |
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86 |
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87 private String toString(Set<LuanTable> set) { |
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88 // return "table: " + Integer.toHexString(hashCode()); |
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89 if( !set.add(this) ) { |
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90 return "..."; |
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91 } |
47
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92 StringBuilder sb = new StringBuilder(); |
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93 sb.append('{'); |
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94 boolean isFirst = true; |
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95 if( list != null ) { |
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96 boolean gotNull = false; |
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97 for( int i=0; i<list.size(); i++ ) { |
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98 Object obj = list.get(i); |
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99 if( obj==null ) { |
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100 gotNull = true; |
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101 } else { |
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102 if( isFirst ) { |
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103 isFirst = false; |
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104 } else { |
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105 sb.append(", "); |
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106 } |
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107 if( gotNull ) |
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108 sb.append(i+1).append('='); |
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109 sb.append(toString(set,obj)); |
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110 } |
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111 } |
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112 } |
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113 if( map != null ) { |
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114 for( Map.Entry<Object,Object> entry : map.entrySet() ) { |
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115 if( isFirst ) { |
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116 isFirst = false; |
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117 } else { |
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118 sb.append(", "); |
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119 } |
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120 sb.append(toString(set,entry.getKey())).append('=').append(toString(set,entry.getValue())); |
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121 } |
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122 } |
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123 sb.append('}'); |
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124 return sb.toString(); |
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125 } |
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126 |
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127 private static String toString(Set<LuanTable> set,Object obj) { |
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128 if( obj instanceof LuanTable ) { |
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129 LuanTable t = (LuanTable)obj; |
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130 return t.toString(set); |
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131 } else { |
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132 return Luan.toString(obj); |
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133 } |
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134 } |
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135 |
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136 public Object get(Object key) { |
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137 if( list != null ) { |
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138 Integer iT = Luan.asInteger(key); |
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139 if( iT != null ) { |
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140 int i = iT - 1; |
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141 if( i>=0 && i<list.size() ) |
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142 return list.get(i); |
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143 } |
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144 } |
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145 if( map==null ) |
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146 return null; |
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147 return map.get(key); |
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148 } |
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149 |
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150 public Object put(Object key,Object val) { |
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151 Integer iT = Luan.asInteger(key); |
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152 if( iT != null ) { |
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153 int i = iT - 1; |
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154 if( list != null || i == 0 ) { |
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155 if( i == list().size() ) { |
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156 if( val != null ) { |
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157 list.add(val); |
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158 mapToList(); |
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159 } |
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160 return null; |
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161 } else if( i>=0 && i<list.size() ) { |
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162 Object old = list.get(i); |
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163 list.set(i,val); |
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164 if( val == null && i == list.size()-1 ) { |
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165 while( i>=0 && list.get(i)==null ) { |
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166 list.remove(i--); |
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167 } |
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168 } |
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169 return old; |
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170 } |
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171 } |
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172 } |
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173 if( map==null ) { |
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174 map = new HashMap<Object,Object>(); |
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175 } |
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176 if( key instanceof Number && !(key instanceof Double) ) { |
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177 Number n = (Number)key; |
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178 key = Double.valueOf(n.doubleValue()); |
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179 } |
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180 if( val == null ) { |
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181 return map.remove(key); |
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182 } else { |
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183 return map.put(key,val); |
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184 } |
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185 } |
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186 |
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187 private void mapToList() { |
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188 if( map != null ) { |
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189 while(true) { |
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190 Object v = map.remove(Double.valueOf(list.size()+1)); |
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191 if( v == null ) |
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192 break; |
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193 list.add(v); |
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194 } |
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195 } |
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196 } |
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197 |
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198 private List<Object> list() { |
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199 if( list == null ) { |
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200 list = new ArrayList<Object>(); |
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201 mapToList(); |
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202 } |
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203 return list; |
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204 } |
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205 |
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206 public void insert(int pos,Object value) { |
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207 list().add(pos-1,value); |
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208 } |
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209 |
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210 public Object remove(int pos) { |
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211 return list().remove(pos-1); |
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212 } |
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213 |
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214 public void sort(Comparator<Object> cmp) { |
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215 Collections.sort(list(),cmp); |
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216 } |
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217 |
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218 public int length() { |
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219 return list==null ? 0 : list.size(); |
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220 } |
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221 |
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222 public Iterator<Map.Entry<Object,Object>> iterator() { |
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223 if( list == null ) { |
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224 if( map == null ) |
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225 return Collections.<Map.Entry<Object,Object>>emptyList().iterator(); |
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226 return map.entrySet().iterator(); |
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227 } |
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228 if( map == null ) |
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229 return listIterator(); |
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230 return new Iterator<Map.Entry<Object,Object>>() { |
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231 Iterator<Map.Entry<Object,Object>> iter = listIterator(); |
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232 boolean isList = true; |
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233 public boolean hasNext() { |
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234 boolean b = iter.hasNext(); |
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235 if( !b && isList ) { |
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236 iter = map.entrySet().iterator(); |
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237 isList = false; |
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238 b = iter.hasNext(); |
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239 } |
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240 return b; |
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241 } |
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242 public Map.Entry<Object,Object> next() { |
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243 return iter.next(); |
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244 } |
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245 public void remove() { |
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246 throw new UnsupportedOperationException(); |
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247 } |
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248 }; |
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249 } |
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250 |
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251 public Iterator<Map.Entry<Object,Object>> listIterator() { |
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252 if( list == null ) |
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253 return Collections.<Map.Entry<Object,Object>>emptyList().iterator(); |
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254 final ListIterator iter = list.listIterator(); |
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255 return new Iterator<Map.Entry<Object,Object>>() { |
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256 public boolean hasNext() { |
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257 return iter.hasNext(); |
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258 } |
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259 public Map.Entry<Object,Object> next() { |
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260 Double key = Double.valueOf(iter.nextIndex()+1); |
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261 return new MapEntry(key,iter.next()); |
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262 } |
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263 public void remove() { |
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264 throw new UnsupportedOperationException(); |
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265 } |
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266 }; |
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267 } |
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268 |
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269 public Object[] listToArray() { |
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270 return list==null ? new Object[0] : list.toArray(); |
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271 } |
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272 |
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273 public LuanTable subList(int from,int to) { |
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274 return new LuanTable(new ArrayList<Object>(list().subList(from-1,to-1))); |
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275 } |
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276 |
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277 public LuanTable getMetatable() { |
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278 return metatable; |
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279 } |
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280 |
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281 public void setMetatable(LuanTable metatable) { |
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282 this.metatable = metatable; |
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283 } |
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284 |
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285 private static final class MapEntry implements Map.Entry<Object,Object> { |
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286 private final Object key; |
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287 private final Object value; |
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288 |
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289 MapEntry(Object key,Object value) { |
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290 this.key = key; |
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291 this.value = value; |
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292 } |
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293 |
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294 @Override public Object getKey() { |
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295 return key; |
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296 } |
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297 |
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298 @Override public Object getValue() { |
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299 return value; |
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300 } |
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301 |
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302 @Override public Object setValue(Object value) { |
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303 throw new UnsupportedOperationException(); |
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304 } |
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305 } |
1
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306 } |