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package org.webmacro.util; |
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|
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import java.io.BufferedReader; |
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import java.io.InputStreamReader; |
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import java.io.UnsupportedEncodingException; |
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import java.util.HashMap; |
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import java.util.Map; |
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|
32 | 0 | class Bucket |
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{ |
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|
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public String string1; |
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public String string2; |
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public String string3; |
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public String string4; |
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public String string5; |
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public byte[] bytes1; |
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public byte[] bytes2; |
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public byte[] bytes3; |
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public byte[] bytes4; |
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public byte[] bytes5; |
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} |
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|
47 | 0 | class ArrayBucket |
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{ |
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|
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public String string1[]; |
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public String string2[]; |
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public String string3[]; |
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public String string4[]; |
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public String string5[]; |
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public byte[] bytes1[]; |
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public byte[] bytes2[]; |
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public byte[] bytes3[]; |
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public byte[] bytes4[]; |
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public byte[] bytes5[]; |
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} |
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final public class EncodingCache |
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{ |
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|
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final private String _encoding; |
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final private Bucket[] _cache; |
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final private ArrayBucket[] _acache; |
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final private int _size; |
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|
74 | 0 | final static private Map _ecCache = new HashMap(); |
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|
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public EncodingCache (String encoding) |
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throws UnsupportedEncodingException |
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{ |
79 | 0 | this(encoding, 1001); |
80 | 0 | } |
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public EncodingCache (String encoding, int buckets) |
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throws UnsupportedEncodingException |
90 | 0 | { |
91 | 0 | _size = buckets; |
92 | |
|
93 | 0 | _cache = new Bucket[_size]; |
94 | 0 | _acache = new ArrayBucket[_size]; |
95 | |
|
96 | 0 | for (int i = 0; i < _size; i++) |
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{ |
98 | 0 | _cache[i] = new Bucket(); |
99 | 0 | _acache[i] = new ArrayBucket(); |
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} |
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|
102 | 0 | if ((encoding == null) || |
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encoding.equalsIgnoreCase("UNICODE") || |
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encoding.equalsIgnoreCase("UNICODEBIG") || |
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encoding.equalsIgnoreCase("UNICODELITTLE") || |
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encoding.equalsIgnoreCase("UTF16")) |
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{ |
108 | 0 | throw new UnsupportedEncodingException( |
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"The encoding you specified is invalid: " + |
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encoding + ". " + |
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"Note that the UNICODE and UTF16 encodings are not " + |
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"supported by WebMacro because " + |
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"they prefix the stream with a marker indicating " + |
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"whether the stream is big endian or little endian. " + |
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"Instead choose the byte ordering yourself by using " + |
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"the UTF-16BE or UTF-16LE encodings."); |
117 | |
} |
118 | 0 | _encoding = encoding; |
119 | |
|
120 | 0 | "some test string".getBytes(encoding); |
121 | 0 | } |
122 | |
|
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public String getEncodingName () |
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{ |
125 | 0 | return _encoding; |
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} |
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|
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public byte[] encode (String s) |
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{ |
130 | 0 | if (s == null) |
131 | 0 | return null; |
132 | |
|
133 | 0 | int hash = s.hashCode() % _size; |
134 | 0 | if (hash < 0) hash = -hash; |
135 | 0 | Bucket b = _cache[hash]; |
136 | 0 | synchronized (b) |
137 | |
{ |
138 | 0 | if (b.string1 == s) |
139 | 0 | return b.bytes1; |
140 | 0 | else if (b.string2 == s) |
141 | 0 | return b.bytes2; |
142 | 0 | else if (b.string3 == s) |
143 | 0 | return b.bytes3; |
144 | 0 | else if (b.string4 == s) |
145 | 0 | return b.bytes4; |
146 | 0 | else if (b.string5 == s) |
147 | 0 | return b.bytes5; |
148 | |
|
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try |
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{ |
151 | 0 | byte[] buf = s.getBytes(_encoding); |
152 | |
|
153 | 0 | b.string5 = b.string4; |
154 | 0 | b.string4 = b.string3; |
155 | 0 | b.string3 = b.string2; |
156 | 0 | b.string2 = b.string1; |
157 | 0 | b.string1 = s; |
158 | |
|
159 | 0 | b.bytes5 = b.bytes4; |
160 | 0 | b.bytes4 = b.bytes3; |
161 | 0 | b.bytes3 = b.bytes2; |
162 | 0 | b.bytes2 = b.bytes1; |
163 | 0 | b.bytes1 = buf; |
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; |
165 | |
|
166 | 0 | return buf; |
167 | |
} |
168 | 0 | catch (UnsupportedEncodingException e) |
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{ |
170 | 0 | e.printStackTrace(); |
171 | 0 | return null; |
172 | |
} |
173 | 0 | } |
174 | |
} |
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|
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public byte[][] encode (String s[]) |
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{ |
178 | 0 | return encode(s, System.identityHashCode(s)); |
179 | |
} |
180 | |
|
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public byte[][] encode (String s[], int hash) |
182 | |
{ |
183 | 0 | if (hash < 0) hash = -hash; |
184 | 0 | hash %= _size; |
185 | 0 | ArrayBucket b = _acache[hash]; |
186 | 0 | synchronized (b) |
187 | |
{ |
188 | 0 | if (b.string1 == s) |
189 | 0 | return b.bytes1; |
190 | 0 | else if (b.string2 == s) |
191 | 0 | return b.bytes2; |
192 | 0 | else if (b.string3 == s) |
193 | 0 | return b.bytes3; |
194 | 0 | else if (b.string4 == s) |
195 | 0 | return b.bytes4; |
196 | 0 | else if (b.string5 == s) |
197 | 0 | return b.bytes5; |
198 | 0 | else if (s == null) |
199 | 0 | return null; |
200 | |
|
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try |
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{ |
203 | 0 | byte[][] buf = new byte[s.length][]; |
204 | 0 | for (int i = 0; i < buf.length; i++) |
205 | |
{ |
206 | 0 | if (s[i] != null) |
207 | |
{ |
208 | 0 | buf[i] = s[i].getBytes(_encoding); |
209 | |
} |
210 | |
} |
211 | |
|
212 | 0 | b.string5 = b.string4; |
213 | 0 | b.string4 = b.string3; |
214 | 0 | b.string3 = b.string2; |
215 | 0 | b.string2 = b.string1; |
216 | 0 | b.string1 = s; |
217 | |
|
218 | 0 | b.bytes5 = b.bytes4; |
219 | 0 | b.bytes4 = b.bytes3; |
220 | 0 | b.bytes3 = b.bytes2; |
221 | 0 | b.bytes2 = b.bytes1; |
222 | 0 | b.bytes1 = buf; |
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; |
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|
225 | 0 | return buf; |
226 | |
} |
227 | 0 | catch (UnsupportedEncodingException e) |
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{ |
229 | 0 | e.printStackTrace(); |
230 | 0 | return null; |
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} |
232 | 0 | } |
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} |
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|
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|
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public static EncodingCache getInstance (String encoding) |
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throws UnsupportedEncodingException |
238 | |
{ |
239 | 0 | synchronized (_ecCache) |
240 | |
{ |
241 | 0 | EncodingCache ec = (EncodingCache) _ecCache.get(encoding); |
242 | 0 | if (ec == null) |
243 | |
{ |
244 | 0 | ec = new EncodingCache(encoding); |
245 | 0 | _ecCache.put(encoding, ec); |
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} |
247 | 0 | return ec; |
248 | 0 | } |
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} |
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|
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public static void main (String arg[]) |
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{ |
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try |
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{ |
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|
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|
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|
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|
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|
260 | 0 | EncodingCache ec = new EncodingCache("UTF-16LE", 11); |
261 | 0 | BufferedReader in = new |
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BufferedReader(new InputStreamReader(System.in)); |
263 | |
String s; |
264 | 0 | while ((s = in.readLine()) != null) |
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{ |
266 | 0 | String s1 = s.intern(); |
267 | 0 | byte b[] = ec.encode(s1); |
268 | 0 | String s2 = new String(b, "UTF-16LE"); |
269 | 0 | System.out.print("Encoding string: " + s1 + " --> ["); |
270 | 0 | System.out.print(s2); |
271 | 0 | System.out.println("]"); |
272 | 0 | } |
273 | |
} |
274 | 0 | catch (Exception e) |
275 | |
{ |
276 | 0 | e.printStackTrace(); |
277 | 0 | } |
278 | 0 | } |
279 | |
} |
280 | |
|