-
Notifications
You must be signed in to change notification settings - Fork 32
/
UInteger.java
347 lines (293 loc) · 10.2 KB
/
UInteger.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
/*
* Copyright (c) Data Geekery GmbH (http://www.datageekery.com)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.joou;
import java.io.ObjectStreamException;
import java.math.BigInteger;
/**
* The <code>unsigned int</code> type
*
* @author Lukas Eder
* @author Ed Schaller
* @author Jens Nerche
*/
public final class UInteger extends UNumber implements Comparable<UInteger> {
private static final Class<UInteger> CLASS = UInteger.class;
private static final String CLASS_NAME = CLASS.getName();
/**
* System property name for the property to set the size of the pre-cache.
*/
private static final String PRECACHE_PROPERTY = CLASS_NAME + ".precacheSize";
/**
* Default size for the value cache.
*/
private static final int DEFAULT_PRECACHE_SIZE = 256;
/**
* Generated UID
*/
private static final long serialVersionUID = -6821055240959745390L;
/**
* Cached values
*/
private static final UInteger[] VALUES = mkValues();
/**
* A constant holding the minimum value an <code>unsigned int</code> can
* have, 0.
*/
public static final long MIN_VALUE = 0x00000000;
/**
* A constant holding the maximum value an <code>unsigned int</code> can
* have, 2<sup>32</sup>-1.
*/
public static final long MAX_VALUE = 0xffffffffL;
/**
* A constant holding the minimum value an <code>unsigned int</code> can
* have as UInteger, 0.
*/
public static final UInteger MIN = valueOf(MIN_VALUE);
/**
* A constant holding the maximum value an <code>unsigned int</code> can
* have as UInteger, 2<sup>32</sup>-1.
*/
public static final UInteger MAX = valueOf(MAX_VALUE);
/**
* The value modelling the content of this <code>unsigned int</code>
*/
private final long value;
/**
* Figure out the size of the precache.
*
* @return The parsed value of the system property
* {@link #PRECACHE_PROPERTY} or {@link #DEFAULT_PRECACHE_SIZE} if
* the property is not set, not a number or retrieving results in a
* {@link SecurityException}. If the parsed value is zero or
* negative no cache will be created. If the value is larger than
* {@link Integer#MAX_VALUE} then Integer#MAX_VALUE will be used.
*/
private static final int getPrecacheSize() {
String prop = null;
long propParsed;
try {
prop = System.getProperty(PRECACHE_PROPERTY);
}
catch (SecurityException e) {
// security manager stopped us so use default
// FIXME: should we log this somewhere?
return DEFAULT_PRECACHE_SIZE;
}
if (prop == null)
return DEFAULT_PRECACHE_SIZE;
// empty value
// FIXME: should we log this somewhere?
if (prop.length() <= 0)
return DEFAULT_PRECACHE_SIZE;
try {
propParsed = Long.parseLong(prop);
}
catch (NumberFormatException e) {
// not a valid number
// FIXME: should we log this somewhere?
return DEFAULT_PRECACHE_SIZE;
}
// treat negative value as no cache...
if (propParsed < 0)
return 0;
// FIXME: should we log this somewhere?
if (propParsed > Integer.MAX_VALUE)
return Integer.MAX_VALUE;
return (int) propParsed;
}
/**
* Generate a cached value for initial unsigned integer values.
*
* @return Array of cached values for UInteger
*/
private static final UInteger[] mkValues() {
int precacheSize = getPrecacheSize();
UInteger[] ret;
if (precacheSize <= 0)
return null;
ret = new UInteger[precacheSize];
for (int i = 0; i < precacheSize; i++)
ret[i] = new UInteger(i);
return ret;
}
/**
* Unchecked internal constructor. This serves two purposes: first it allows
* {@link #UInteger(long)} to stay deprecated without warnings and second
* constructor without unnecessary value checks.
*
* @param value The value to wrap
* @param unused Unused parameter to distinguish between this and the
* deprecated public constructor.
*/
private UInteger(long value, boolean unused) {
this.value = value;
}
/**
* Retrieve a cached value.
*
* @param value Cached value to retrieve
* @return Cached value if one exists. Null otherwise.
*/
private static UInteger getCached(long value) {
if (VALUES != null && value < VALUES.length)
return VALUES[(int) value];
return null;
}
/**
* Get the value of a long without checking the value.
*/
private static UInteger valueOfUnchecked(long value) {
UInteger cached;
if ((cached = getCached(value)) != null)
return cached;
return new UInteger(value, true);
}
/**
* Create an <code>unsigned int</code>
*
* @throws NumberFormatException If <code>value</code> does not contain a
* parsable <code>unsigned int</code>.
*/
public static UInteger valueOf(String value) throws NumberFormatException {
return valueOfUnchecked(rangeCheck(Long.parseLong(value)));
}
/**
* Create an <code>unsigned int</code> by masking it with
* <code>0xFFFFFFFF</code> i.e. <code>(int) -1</code> becomes
* <code>(uint) 4294967295</code>
*/
public static UInteger valueOf(int value) {
return valueOfUnchecked(value & MAX_VALUE);
}
/**
* Create an <code>unsigned int</code>
*
* @throws NumberFormatException If <code>value</code> is not in the range
* of an <code>unsigned byte</code>
*/
public static UInteger valueOf(long value) throws NumberFormatException {
return valueOfUnchecked(rangeCheck(value));
}
/**
* Create an <code>unsigned int</code>
*
* @throws NumberFormatException If <code>value</code> is not in the range
* of an <code>unsigned int</code>
*/
private UInteger(long value) throws NumberFormatException {
this.value = rangeCheck(value);
}
/**
* Create an <code>unsigned int</code> by masking it with
* <code>0xFFFFFFFF</code> i.e. <code>(int) -1</code> becomes
* <code>(uint) 4294967295</code>
*/
private UInteger(int value) {
this.value = value & MAX_VALUE;
}
/**
* Create an <code>unsigned int</code>
*
* @throws NumberFormatException If <code>value</code> does not contain a
* parsable <code>unsigned int</code>.
*/
private UInteger(String value) throws NumberFormatException {
this.value = rangeCheck(Long.parseLong(value));
}
/**
* Throw exception if value out of range (long version)
*
* @param value Value to check
* @return value if it is in range
* @throws NumberFormatException if value is out of range
*/
private static long rangeCheck(long value) throws NumberFormatException {
if (value < MIN_VALUE || value > MAX_VALUE)
throw new NumberFormatException("Value is out of range : " + value);
return value;
}
/**
* Replace version read through deserialization with cached version.
*
* @return cached instance of this object's value if one exists, otherwise
* this object
* @throws ObjectStreamException
*/
private Object readResolve() throws ObjectStreamException {
UInteger cached;
// the value read could be invalid so check it
rangeCheck(value);
if ((cached = getCached(value)) != null)
return cached;
return this;
}
@Override
public int intValue() {
return (int) value;
}
@Override
public long longValue() {
return value;
}
@Override
public float floatValue() {
return value;
}
@Override
public double doubleValue() {
return value;
}
@Override
public BigInteger toBigInteger() {
return BigInteger.valueOf(value);
}
@Override
public int hashCode() {
/* [java-8] */
if (true) return Long.hashCode(value);
/* [/java-8] */
return Long.valueOf(value).hashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj instanceof UInteger)
return value == ((UInteger) obj).value;
return false;
}
@Override
public String toString() {
return Long.toString(value);
}
@Override
public int compareTo(UInteger o) {
return (value < o.value ? -1 : (value == o.value ? 0 : 1));
}
public UInteger add(final UInteger val) {
return valueOf(value + val.value);
}
public UInteger add(final int val) {
return valueOf(value + val);
}
public UInteger subtract(final UInteger val) {
return valueOf(value - val.value);
}
public UInteger subtract(final int val) {
return valueOf(value - val);
}
}