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19 package org.eclipse.jetty.util;
20
21 import java.io.IOException;
22 import java.nio.ByteBuffer;
23 import java.util.HashSet;
24 import java.util.Set;
25
26
27
28
29
30
31 public class ArrayTrie<V> implements Trie<V>
32 {
33
34
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36
37
38
39 private static final int ROW_SIZE = 32;
40
41
42
43
44
45 private static final int[] __lookup =
46 {
47
48
49
50
51
52
53
54
55 };
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66
67
68 private final char[] _rowIndex;
69
70
71
72
73
74 private final String[] _key;
75
76
77
78
79
80 private final Object[] _value;
81
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85
86
87
88 private char[][] _bigIndex;
89
90
91
92
93 private char _rows;
94
95 public ArrayTrie()
96 {
97 this(128);
98 }
99
100 public ArrayTrie(int capacityInNodes)
101 {
102 _value=new Object[capacityInNodes];
103 _rowIndex=new char[capacityInNodes*32];
104 _key=new String[capacityInNodes];
105 }
106
107
108
109 @Override
110 public boolean put(String s, V v)
111 {
112 int t=0;
113 int k;
114 int limit = s.length();
115 for(k=0; k < limit; k++)
116 {
117 char c=s.charAt(k);
118
119 int index=__lookup[c&0x7f];
120 if (index>=0)
121 {
122 int idx=t*ROW_SIZE+index;
123 t=_rowIndex[idx];
124 if (t==0)
125 {
126 if (++_rows>=_value.length)
127 return false;
128 t=_rowIndex[idx]=_rows;
129 }
130 }
131 else if (c>127)
132 throw new IllegalArgumentException("non ascii character");
133 else
134 {
135 if (_bigIndex==null)
136 _bigIndex=new char[_value.length][];
137 if (t>=_bigIndex.length)
138 return false;
139 char[] big=_bigIndex[t];
140 if (big==null)
141 big=_bigIndex[t]=new char[128];
142 t=big[c];
143 if (t==0)
144 {
145 if (_rows==_value.length)
146 return false;
147 t=big[c]=++_rows;
148 }
149 }
150 }
151 _key[t]=v==null?null:s;
152 V old=(V)_value[t];
153 _value[t] = v;
154 return true;
155 }
156
157
158
159 @Override
160 public boolean put(V v)
161 {
162 return put(v.toString(),v);
163 }
164
165
166 @Override
167 public V remove(String s)
168 {
169 V o=get(s);
170 put(s,null);
171 return o;
172 }
173
174
175 @Override
176 public V get(String s)
177 {
178 int t = 0;
179 int len = s.length();
180 for(int i=0; i < len; i++)
181 {
182 char c=s.charAt(i);
183 int index=__lookup[c&0x7f];
184 if (index>=0)
185 {
186 int idx=t*ROW_SIZE+index;
187 t=_rowIndex[idx];
188 if (t==0)
189 return null;
190 }
191 else
192 {
193 char[] big = _bigIndex==null?null:_bigIndex[t];
194 if (big==null)
195 return null;
196 t=big[c];
197 if (t==0)
198 return null;
199 }
200 }
201 return (V)_value[t];
202 }
203
204
205 @Override
206 public V get(ByteBuffer b,int offset,int len)
207 {
208 int t = 0;
209 for(int i=0; i < len; i++)
210 {
211 byte c=b.get(offset+i);
212 int index=__lookup[c&0x7f];
213 if (index>=0)
214 {
215 int idx=t*ROW_SIZE+index;
216 t=_rowIndex[idx];
217 if (t==0)
218 return null;
219 }
220 else
221 {
222 char[] big = _bigIndex==null?null:_bigIndex[t];
223 if (big==null)
224 return null;
225 t=big[c];
226 if (t==0)
227 return null;
228 }
229 }
230 return (V)_value[t];
231 }
232
233
234 @Override
235 public V getBest(byte[] b,int offset,int len)
236 {
237 return getBest(0,b,offset,len);
238 }
239
240
241 @Override
242 public V getBest(ByteBuffer b,int offset,int len)
243 {
244 if (b.hasArray())
245 return getBest(0,b.array(),b.arrayOffset()+b.position()+offset,len);
246 return getBest(0,b,offset,len);
247 }
248
249 private V getBest(int t,byte[] b,int offset,int len)
250 {
251 for(int i=0; i < len; i++)
252 {
253 byte c=b[offset+i];
254 int index=__lookup[c&0x7f];
255 if (index>=0)
256 {
257 int idx=t*ROW_SIZE+index;
258 t=_rowIndex[idx];
259 if (t==0)
260 return null;
261 }
262 else
263 {
264 char[] big = _bigIndex==null?null:_bigIndex[t];
265 if (big==null)
266 return null;
267 t=big[c];
268 if (t==0)
269 return null;
270 }
271
272
273 if (_key[t]!=null)
274 {
275
276 V best=getBest(t,b,offset+i+1,len-i-1);
277 if (best!=null)
278 return best;
279 return (V)_value[t];
280 }
281 }
282 return (V)_value[t];
283 }
284
285 private V getBest(int t,ByteBuffer b,int offset,int len)
286 {
287 int pos=b.position()+offset;
288 for(int i=0; i < len; i++)
289 {
290 byte c=b.get(pos++);
291 int index=__lookup[c&0x7f];
292 if (index>=0)
293 {
294 int idx=t*ROW_SIZE+index;
295 t=_rowIndex[idx];
296 if (t==0)
297 return null;
298 }
299 else
300 {
301 char[] big = _bigIndex==null?null:_bigIndex[t];
302 if (big==null)
303 return null;
304 t=big[c];
305 if (t==0)
306 return null;
307 }
308
309
310 if (_key[t]!=null)
311 {
312
313 V best=getBest(t,b,offset+i+1,len-i-1);
314 if (best!=null)
315 return best;
316 return (V)_value[t];
317 }
318 }
319 return (V)_value[t];
320 }
321
322
323
324
325 @Override
326 public String toString()
327 {
328 StringBuilder buf = new StringBuilder();
329 toString(buf,0);
330
331 if (buf.length()==0)
332 return "{}";
333
334 buf.setCharAt(0,'{');
335 buf.append('}');
336 return buf.toString();
337 }
338
339
340 private <V> void toString(Appendable out, int t)
341 {
342 if (_value[t]!=null)
343 {
344 try
345 {
346 out.append(',');
347 out.append(_key[t]);
348 out.append('=');
349 out.append(_value[t].toString());
350 }
351 catch (IOException e)
352 {
353 throw new RuntimeException(e);
354 }
355 }
356
357 for(int i=0; i < ROW_SIZE; i++)
358 {
359 int idx=t*ROW_SIZE+i;
360 if (_rowIndex[idx] != 0)
361 toString(out,_rowIndex[idx]);
362 }
363
364 char[] big = _bigIndex==null?null:_bigIndex[t];
365 if (big!=null)
366 {
367 for (int i:big)
368 if (i!=0)
369 toString(out,i);
370 }
371
372 }
373
374 @Override
375 public Set<String> keySet()
376 {
377 Set<String> keys = new HashSet<>();
378 keySet(keys,0);
379 return keys;
380 }
381
382 private void keySet(Set<String> set, int t)
383 {
384 if (t<_value.length&&_value[t]!=null)
385 set.add(_key[t]);
386
387 for(int i=0; i < ROW_SIZE; i++)
388 {
389 int idx=t*ROW_SIZE+i;
390 if (idx<_rowIndex.length && _rowIndex[idx] != 0)
391 keySet(set,_rowIndex[idx]);
392 }
393
394 char[] big = _bigIndex==null||t>=_bigIndex.length?null:_bigIndex[t];
395 if (big!=null)
396 {
397 for (int i:big)
398 if (i!=0)
399 keySet(set,i);
400 }
401 }
402
403 @Override
404 public boolean isFull()
405 {
406 return _rows+1==_key.length;
407 }
408 }