1 |
14 |
jlechner |
/* Short.java -- object wrapper for short
|
2 |
|
|
Copyright (C) 1998, 2001, 2002, 2005 Free Software Foundation, Inc.
|
3 |
|
|
|
4 |
|
|
This file is part of GNU Classpath.
|
5 |
|
|
|
6 |
|
|
GNU Classpath is free software; you can redistribute it and/or modify
|
7 |
|
|
it under the terms of the GNU General Public License as published by
|
8 |
|
|
the Free Software Foundation; either version 2, or (at your option)
|
9 |
|
|
any later version.
|
10 |
|
|
|
11 |
|
|
GNU Classpath is distributed in the hope that it will be useful, but
|
12 |
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
13 |
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
14 |
|
|
General Public License for more details.
|
15 |
|
|
|
16 |
|
|
You should have received a copy of the GNU General Public License
|
17 |
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
18 |
|
|
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
19 |
|
|
02110-1301 USA.
|
20 |
|
|
|
21 |
|
|
Linking this library statically or dynamically with other modules is
|
22 |
|
|
making a combined work based on this library. Thus, the terms and
|
23 |
|
|
conditions of the GNU General Public License cover the whole
|
24 |
|
|
combination.
|
25 |
|
|
|
26 |
|
|
As a special exception, the copyright holders of this library give you
|
27 |
|
|
permission to link this library with independent modules to produce an
|
28 |
|
|
executable, regardless of the license terms of these independent
|
29 |
|
|
modules, and to copy and distribute the resulting executable under
|
30 |
|
|
terms of your choice, provided that you also meet, for each linked
|
31 |
|
|
independent module, the terms and conditions of the license of that
|
32 |
|
|
module. An independent module is a module which is not derived from
|
33 |
|
|
or based on this library. If you modify this library, you may extend
|
34 |
|
|
this exception to your version of the library, but you are not
|
35 |
|
|
obligated to do so. If you do not wish to do so, delete this
|
36 |
|
|
exception statement from your version. */
|
37 |
|
|
|
38 |
|
|
|
39 |
|
|
package java.lang;
|
40 |
|
|
|
41 |
|
|
/**
|
42 |
|
|
* Instances of class <code>Short</code> represent primitive
|
43 |
|
|
* <code>short</code> values.
|
44 |
|
|
*
|
45 |
|
|
* Additionally, this class provides various helper functions and variables
|
46 |
|
|
* related to shorts.
|
47 |
|
|
*
|
48 |
|
|
* @author Paul Fisher
|
49 |
|
|
* @author John Keiser
|
50 |
|
|
* @author Eric Blake (ebb9@email.byu.edu)
|
51 |
|
|
* @since 1.1
|
52 |
|
|
* @status updated to 1.4
|
53 |
|
|
*/
|
54 |
|
|
public final class Short extends Number implements Comparable
|
55 |
|
|
{
|
56 |
|
|
/**
|
57 |
|
|
* Compatible with JDK 1.1+.
|
58 |
|
|
*/
|
59 |
|
|
private static final long serialVersionUID = 7515723908773894738L;
|
60 |
|
|
|
61 |
|
|
/**
|
62 |
|
|
* The minimum value a <code>short</code> can represent is -32768 (or
|
63 |
|
|
* -2<sup>15</sup>).
|
64 |
|
|
*/
|
65 |
|
|
public static final short MIN_VALUE = -32768;
|
66 |
|
|
|
67 |
|
|
/**
|
68 |
|
|
* The minimum value a <code>short</code> can represent is 32767 (or
|
69 |
|
|
* 2<sup>15</sup>).
|
70 |
|
|
*/
|
71 |
|
|
public static final short MAX_VALUE = 32767;
|
72 |
|
|
|
73 |
|
|
/**
|
74 |
|
|
* The primitive type <code>short</code> is represented by this
|
75 |
|
|
* <code>Class</code> object.
|
76 |
|
|
*/
|
77 |
|
|
public static final Class TYPE = VMClassLoader.getPrimitiveClass('S');
|
78 |
|
|
|
79 |
|
|
/**
|
80 |
|
|
* The number of bits needed to represent a <code>short</code>.
|
81 |
|
|
* @since 1.5
|
82 |
|
|
*/
|
83 |
|
|
public static final int SIZE = 16;
|
84 |
|
|
|
85 |
|
|
// This caches some Short values, and is used by boxing conversions
|
86 |
|
|
// via valueOf(). We must cache at least -128..127; these constants
|
87 |
|
|
// control how much we actually cache.
|
88 |
|
|
private static final int MIN_CACHE = -128;
|
89 |
|
|
private static final int MAX_CACHE = 127;
|
90 |
|
|
private static Short[] shortCache = new Short[MAX_CACHE - MIN_CACHE + 1];
|
91 |
|
|
|
92 |
|
|
/**
|
93 |
|
|
* The immutable value of this Short.
|
94 |
|
|
*
|
95 |
|
|
* @serial the wrapped short
|
96 |
|
|
*/
|
97 |
|
|
private final short value;
|
98 |
|
|
|
99 |
|
|
/**
|
100 |
|
|
* Create a <code>Short</code> object representing the value of the
|
101 |
|
|
* <code>short</code> argument.
|
102 |
|
|
*
|
103 |
|
|
* @param value the value to use
|
104 |
|
|
*/
|
105 |
|
|
public Short(short value)
|
106 |
|
|
{
|
107 |
|
|
this.value = value;
|
108 |
|
|
}
|
109 |
|
|
|
110 |
|
|
/**
|
111 |
|
|
* Create a <code>Short</code> object representing the value of the
|
112 |
|
|
* argument after conversion to a <code>short</code>.
|
113 |
|
|
*
|
114 |
|
|
* @param s the string to convert
|
115 |
|
|
* @throws NumberFormatException if the String cannot be parsed
|
116 |
|
|
*/
|
117 |
|
|
public Short(String s)
|
118 |
|
|
{
|
119 |
|
|
value = parseShort(s, 10);
|
120 |
|
|
}
|
121 |
|
|
|
122 |
|
|
/**
|
123 |
|
|
* Converts the <code>short</code> to a <code>String</code> and assumes
|
124 |
|
|
* a radix of 10.
|
125 |
|
|
*
|
126 |
|
|
* @param s the <code>short</code> to convert to <code>String</code>
|
127 |
|
|
* @return the <code>String</code> representation of the argument
|
128 |
|
|
*/
|
129 |
|
|
public static String toString(short s)
|
130 |
|
|
{
|
131 |
|
|
return String.valueOf(s);
|
132 |
|
|
}
|
133 |
|
|
|
134 |
|
|
/**
|
135 |
|
|
* Converts the specified <code>String</code> into a <code>short</code>.
|
136 |
|
|
* This function assumes a radix of 10.
|
137 |
|
|
*
|
138 |
|
|
* @param s the <code>String</code> to convert
|
139 |
|
|
* @return the <code>short</code> value of <code>s</code>
|
140 |
|
|
* @throws NumberFormatException if <code>s</code> cannot be parsed as a
|
141 |
|
|
* <code>short</code>
|
142 |
|
|
*/
|
143 |
|
|
public static short parseShort(String s)
|
144 |
|
|
{
|
145 |
|
|
return parseShort(s, 10);
|
146 |
|
|
}
|
147 |
|
|
|
148 |
|
|
/**
|
149 |
|
|
* Converts the specified <code>String</code> into a <code>short</code>
|
150 |
|
|
* using the specified radix (base). The string must not be <code>null</code>
|
151 |
|
|
* or empty. It may begin with an optional '-', which will negate the answer,
|
152 |
|
|
* provided that there are also valid digits. Each digit is parsed as if by
|
153 |
|
|
* <code>Character.digit(d, radix)</code>, and must be in the range
|
154 |
|
|
* <code>0</code> to <code>radix - 1</code>. Finally, the result must be
|
155 |
|
|
* within <code>MIN_VALUE</code> to <code>MAX_VALUE</code>, inclusive.
|
156 |
|
|
* Unlike Double.parseDouble, you may not have a leading '+'.
|
157 |
|
|
*
|
158 |
|
|
* @param s the <code>String</code> to convert
|
159 |
|
|
* @param radix the radix (base) to use in the conversion
|
160 |
|
|
* @return the <code>String</code> argument converted to <code>short</code>
|
161 |
|
|
* @throws NumberFormatException if <code>s</code> cannot be parsed as a
|
162 |
|
|
* <code>short</code>
|
163 |
|
|
*/
|
164 |
|
|
public static short parseShort(String s, int radix)
|
165 |
|
|
{
|
166 |
|
|
int i = Integer.parseInt(s, radix, false);
|
167 |
|
|
if ((short) i != i)
|
168 |
|
|
throw new NumberFormatException();
|
169 |
|
|
return (short) i;
|
170 |
|
|
}
|
171 |
|
|
|
172 |
|
|
/**
|
173 |
|
|
* Creates a new <code>Short</code> object using the <code>String</code>
|
174 |
|
|
* and specified radix (base).
|
175 |
|
|
*
|
176 |
|
|
* @param s the <code>String</code> to convert
|
177 |
|
|
* @param radix the radix (base) to convert with
|
178 |
|
|
* @return the new <code>Short</code>
|
179 |
|
|
* @throws NumberFormatException if <code>s</code> cannot be parsed as a
|
180 |
|
|
* <code>short</code>
|
181 |
|
|
* @see #parseShort(String, int)
|
182 |
|
|
*/
|
183 |
|
|
public static Short valueOf(String s, int radix)
|
184 |
|
|
{
|
185 |
|
|
return new Short(parseShort(s, radix));
|
186 |
|
|
}
|
187 |
|
|
|
188 |
|
|
/**
|
189 |
|
|
* Creates a new <code>Short</code> object using the <code>String</code>,
|
190 |
|
|
* assuming a radix of 10.
|
191 |
|
|
*
|
192 |
|
|
* @param s the <code>String</code> to convert
|
193 |
|
|
* @return the new <code>Short</code>
|
194 |
|
|
* @throws NumberFormatException if <code>s</code> cannot be parsed as a
|
195 |
|
|
* <code>short</code>
|
196 |
|
|
* @see #Short(String)
|
197 |
|
|
* @see #parseShort(String)
|
198 |
|
|
*/
|
199 |
|
|
public static Short valueOf(String s)
|
200 |
|
|
{
|
201 |
|
|
return new Short(parseShort(s, 10));
|
202 |
|
|
}
|
203 |
|
|
|
204 |
|
|
/**
|
205 |
|
|
* Returns a <code>Short</code> object wrapping the value.
|
206 |
|
|
* In contrast to the <code>Short</code> constructor, this method
|
207 |
|
|
* will cache some values. It is used by boxing conversion.
|
208 |
|
|
*
|
209 |
|
|
* @param val the value to wrap
|
210 |
|
|
* @return the <code>Short</code>
|
211 |
|
|
*
|
212 |
|
|
* @since 1.5
|
213 |
|
|
*/
|
214 |
|
|
public static Short valueOf(short val)
|
215 |
|
|
{
|
216 |
|
|
if (val < MIN_CACHE || val > MAX_CACHE)
|
217 |
|
|
return new Short(val);
|
218 |
|
|
synchronized (shortCache)
|
219 |
|
|
{
|
220 |
|
|
if (shortCache[val - MIN_CACHE] == null)
|
221 |
|
|
shortCache[val - MIN_CACHE] = new Short(val);
|
222 |
|
|
return shortCache[val - MIN_CACHE];
|
223 |
|
|
}
|
224 |
|
|
}
|
225 |
|
|
|
226 |
|
|
/**
|
227 |
|
|
* Convert the specified <code>String</code> into a <code>Short</code>.
|
228 |
|
|
* The <code>String</code> may represent decimal, hexadecimal, or
|
229 |
|
|
* octal numbers.
|
230 |
|
|
*
|
231 |
|
|
* <p>The extended BNF grammar is as follows:<br>
|
232 |
|
|
* <pre>
|
233 |
|
|
* <em>DecodableString</em>:
|
234 |
|
|
* ( [ <code>-</code> ] <em>DecimalNumber</em> )
|
235 |
|
|
* | ( [ <code>-</code> ] ( <code>0x</code> | <code>0X</code>
|
236 |
|
|
* | <code>#</code> ) <em>HexDigit</em> { <em>HexDigit</em> } )
|
237 |
|
|
* | ( [ <code>-</code> ] <code>0</code> { <em>OctalDigit</em> } )
|
238 |
|
|
* <em>DecimalNumber</em>:
|
239 |
|
|
* <em>DecimalDigit except '0'</em> { <em>DecimalDigit</em> }
|
240 |
|
|
* <em>DecimalDigit</em>:
|
241 |
|
|
* <em>Character.digit(d, 10) has value 0 to 9</em>
|
242 |
|
|
* <em>OctalDigit</em>:
|
243 |
|
|
* <em>Character.digit(d, 8) has value 0 to 7</em>
|
244 |
|
|
* <em>DecimalDigit</em>:
|
245 |
|
|
* <em>Character.digit(d, 16) has value 0 to 15</em>
|
246 |
|
|
* </pre>
|
247 |
|
|
* Finally, the value must be in the range <code>MIN_VALUE</code> to
|
248 |
|
|
* <code>MAX_VALUE</code>, or an exception is thrown.
|
249 |
|
|
*
|
250 |
|
|
* @param s the <code>String</code> to interpret
|
251 |
|
|
* @return the value of the String as a <code>Short</code>
|
252 |
|
|
* @throws NumberFormatException if <code>s</code> cannot be parsed as a
|
253 |
|
|
* <code>short</code>
|
254 |
|
|
* @throws NullPointerException if <code>s</code> is null
|
255 |
|
|
* @see Integer#decode(String)
|
256 |
|
|
*/
|
257 |
|
|
public static Short decode(String s)
|
258 |
|
|
{
|
259 |
|
|
int i = Integer.parseInt(s, 10, true);
|
260 |
|
|
if ((short) i != i)
|
261 |
|
|
throw new NumberFormatException();
|
262 |
|
|
return new Short((short) i);
|
263 |
|
|
}
|
264 |
|
|
|
265 |
|
|
/**
|
266 |
|
|
* Return the value of this <code>Short</code> as a <code>byte</code>.
|
267 |
|
|
*
|
268 |
|
|
* @return the byte value
|
269 |
|
|
*/
|
270 |
|
|
public byte byteValue()
|
271 |
|
|
{
|
272 |
|
|
return (byte) value;
|
273 |
|
|
}
|
274 |
|
|
|
275 |
|
|
/**
|
276 |
|
|
* Return the value of this <code>Short</code>.
|
277 |
|
|
*
|
278 |
|
|
* @return the short value
|
279 |
|
|
*/
|
280 |
|
|
public short shortValue()
|
281 |
|
|
{
|
282 |
|
|
return value;
|
283 |
|
|
}
|
284 |
|
|
|
285 |
|
|
/**
|
286 |
|
|
* Return the value of this <code>Short</code> as an <code>int</code>.
|
287 |
|
|
*
|
288 |
|
|
* @return the int value
|
289 |
|
|
*/
|
290 |
|
|
public int intValue()
|
291 |
|
|
{
|
292 |
|
|
return value;
|
293 |
|
|
}
|
294 |
|
|
|
295 |
|
|
/**
|
296 |
|
|
* Return the value of this <code>Short</code> as a <code>long</code>.
|
297 |
|
|
*
|
298 |
|
|
* @return the long value
|
299 |
|
|
*/
|
300 |
|
|
public long longValue()
|
301 |
|
|
{
|
302 |
|
|
return value;
|
303 |
|
|
}
|
304 |
|
|
|
305 |
|
|
/**
|
306 |
|
|
* Return the value of this <code>Short</code> as a <code>float</code>.
|
307 |
|
|
*
|
308 |
|
|
* @return the float value
|
309 |
|
|
*/
|
310 |
|
|
public float floatValue()
|
311 |
|
|
{
|
312 |
|
|
return value;
|
313 |
|
|
}
|
314 |
|
|
|
315 |
|
|
/**
|
316 |
|
|
* Return the value of this <code>Short</code> as a <code>double</code>.
|
317 |
|
|
*
|
318 |
|
|
* @return the double value
|
319 |
|
|
*/
|
320 |
|
|
public double doubleValue()
|
321 |
|
|
{
|
322 |
|
|
return value;
|
323 |
|
|
}
|
324 |
|
|
|
325 |
|
|
/**
|
326 |
|
|
* Converts the <code>Short</code> value to a <code>String</code> and
|
327 |
|
|
* assumes a radix of 10.
|
328 |
|
|
*
|
329 |
|
|
* @return the <code>String</code> representation of this <code>Short</code>
|
330 |
|
|
*/
|
331 |
|
|
public String toString()
|
332 |
|
|
{
|
333 |
|
|
return String.valueOf(value);
|
334 |
|
|
}
|
335 |
|
|
|
336 |
|
|
/**
|
337 |
|
|
* Return a hashcode representing this Object. <code>Short</code>'s hash
|
338 |
|
|
* code is simply its value.
|
339 |
|
|
*
|
340 |
|
|
* @return this Object's hash code
|
341 |
|
|
*/
|
342 |
|
|
public int hashCode()
|
343 |
|
|
{
|
344 |
|
|
return value;
|
345 |
|
|
}
|
346 |
|
|
|
347 |
|
|
/**
|
348 |
|
|
* Returns <code>true</code> if <code>obj</code> is an instance of
|
349 |
|
|
* <code>Short</code> and represents the same short value.
|
350 |
|
|
*
|
351 |
|
|
* @param obj the object to compare
|
352 |
|
|
* @return whether these Objects are semantically equal
|
353 |
|
|
*/
|
354 |
|
|
public boolean equals(Object obj)
|
355 |
|
|
{
|
356 |
|
|
return obj instanceof Short && value == ((Short) obj).value;
|
357 |
|
|
}
|
358 |
|
|
|
359 |
|
|
/**
|
360 |
|
|
* Compare two Shorts numerically by comparing their <code>short</code>
|
361 |
|
|
* values. The result is positive if the first is greater, negative if the
|
362 |
|
|
* second is greater, and 0 if the two are equal.
|
363 |
|
|
*
|
364 |
|
|
* @param s the Short to compare
|
365 |
|
|
* @return the comparison
|
366 |
|
|
* @since 1.2
|
367 |
|
|
*/
|
368 |
|
|
public int compareTo(Short s)
|
369 |
|
|
{
|
370 |
|
|
return value - s.value;
|
371 |
|
|
}
|
372 |
|
|
|
373 |
|
|
/**
|
374 |
|
|
* Behaves like <code>compareTo(Short)</code> unless the Object
|
375 |
|
|
* is not a <code>Short</code>.
|
376 |
|
|
*
|
377 |
|
|
* @param o the object to compare
|
378 |
|
|
* @return the comparison
|
379 |
|
|
* @throws ClassCastException if the argument is not a <code>Short</code>
|
380 |
|
|
* @see #compareTo(Short)
|
381 |
|
|
* @see Comparable
|
382 |
|
|
* @since 1.2
|
383 |
|
|
*/
|
384 |
|
|
public int compareTo(Object o)
|
385 |
|
|
{
|
386 |
|
|
return compareTo((Short)o);
|
387 |
|
|
}
|
388 |
|
|
|
389 |
|
|
/**
|
390 |
|
|
* Reverse the bytes in val.
|
391 |
|
|
* @since 1.5
|
392 |
|
|
*/
|
393 |
|
|
public static short reverseBytes(short val)
|
394 |
|
|
{
|
395 |
|
|
return (short) (((val >> 8) & 0xff) | ((val << 8) & 0xff00));
|
396 |
|
|
}
|
397 |
|
|
}
|