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45 package org.eclipse.jgit.lib;
46
47 import java.io.IOException;
48 import java.io.ObjectInputStream;
49 import java.io.ObjectOutputStream;
50 import java.io.Serializable;
51
52 import org.eclipse.jgit.annotations.Nullable;
53 import org.eclipse.jgit.errors.InvalidObjectIdException;
54 import org.eclipse.jgit.util.NB;
55 import org.eclipse.jgit.util.RawParseUtils;
56
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59
60 public class ObjectId extends AnyObjectId implements Serializable {
61 private static final long serialVersionUID = 1L;
62
63 private static final ObjectId ZEROID;
64
65 private static final String ZEROID_STR;
66
67 static {
68 ZEROID = new ObjectId(0, 0, 0, 0, 0);
69 ZEROID_STR = ZEROID.name();
70 }
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77 public static final ObjectId zeroId() {
78 return ZEROID;
79 }
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90 public static final boolean isId(@Nullable String id) {
91 if (id == null) {
92 return false;
93 }
94 if (id.length() != Constants.OBJECT_ID_STRING_LENGTH)
95 return false;
96 try {
97 for (int i = 0; i < Constants.OBJECT_ID_STRING_LENGTH; i++) {
98 RawParseUtils.parseHexInt4((byte) id.charAt(i));
99 }
100 return true;
101 } catch (ArrayIndexOutOfBoundsException e) {
102 return false;
103 }
104 }
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113 public static final String toString(ObjectId i) {
114 return i != null ? i.name() : ZEROID_STR;
115 }
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132 public static boolean equals(final byte[] firstBuffer, final int fi,
133 final byte[] secondBuffer, final int si) {
134 return firstBuffer[fi] == secondBuffer[si]
135 && firstBuffer[fi + 1] == secondBuffer[si + 1]
136 && firstBuffer[fi + 2] == secondBuffer[si + 2]
137 && firstBuffer[fi + 3] == secondBuffer[si + 3]
138 && firstBuffer[fi + 4] == secondBuffer[si + 4]
139 && firstBuffer[fi + 5] == secondBuffer[si + 5]
140 && firstBuffer[fi + 6] == secondBuffer[si + 6]
141 && firstBuffer[fi + 7] == secondBuffer[si + 7]
142 && firstBuffer[fi + 8] == secondBuffer[si + 8]
143 && firstBuffer[fi + 9] == secondBuffer[si + 9]
144 && firstBuffer[fi + 10] == secondBuffer[si + 10]
145 && firstBuffer[fi + 11] == secondBuffer[si + 11]
146 && firstBuffer[fi + 12] == secondBuffer[si + 12]
147 && firstBuffer[fi + 13] == secondBuffer[si + 13]
148 && firstBuffer[fi + 14] == secondBuffer[si + 14]
149 && firstBuffer[fi + 15] == secondBuffer[si + 15]
150 && firstBuffer[fi + 16] == secondBuffer[si + 16]
151 && firstBuffer[fi + 17] == secondBuffer[si + 17]
152 && firstBuffer[fi + 18] == secondBuffer[si + 18]
153 && firstBuffer[fi + 19] == secondBuffer[si + 19];
154 }
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164 public static final ObjectId fromRaw(byte[] bs) {
165 return fromRaw(bs, 0);
166 }
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178 public static final ObjectId fromRaw(byte[] bs, int p) {
179 final int a = NB.decodeInt32(bs, p);
180 final int b = NB.decodeInt32(bs, p + 4);
181 final int c = NB.decodeInt32(bs, p + 8);
182 final int d = NB.decodeInt32(bs, p + 12);
183 final int e = NB.decodeInt32(bs, p + 16);
184 return new ObjectId(a, b, c, d, e);
185 }
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195 public static final ObjectId fromRaw(int[] is) {
196 return fromRaw(is, 0);
197 }
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209 public static final ObjectId fromRaw(int[] is, int p) {
210 return new ObjectId(is[p], is[p + 1], is[p + 2], is[p + 3], is[p + 4]);
211 }
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223 public static final ObjectId fromString(byte[] buf, int offset) {
224 return fromHexString(buf, offset);
225 }
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234 public static ObjectId fromString(String str) {
235 if (str.length() != Constants.OBJECT_ID_STRING_LENGTH) {
236 throw new InvalidObjectIdException(str);
237 }
238 return fromHexString(Constants.encodeASCII(str), 0);
239 }
240
241 private static final ObjectId fromHexString(byte[] bs, int p) {
242 try {
243 final int a = RawParseUtils.parseHexInt32(bs, p);
244 final int b = RawParseUtils.parseHexInt32(bs, p + 8);
245 final int c = RawParseUtils.parseHexInt32(bs, p + 16);
246 final int d = RawParseUtils.parseHexInt32(bs, p + 24);
247 final int e = RawParseUtils.parseHexInt32(bs, p + 32);
248 return new ObjectId(a, b, c, d, e);
249 } catch (ArrayIndexOutOfBoundsException e1) {
250 throw new InvalidObjectIdException(bs, p,
251 Constants.OBJECT_ID_STRING_LENGTH);
252 }
253 }
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270 public ObjectId(int new_1, int new_2, int new_3, int new_4, int new_5) {
271 w1 = new_1;
272 w2 = new_2;
273 w3 = new_3;
274 w4 = new_4;
275 w5 = new_5;
276 }
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288 protected ObjectId(AnyObjectId src) {
289 w1 = src.w1;
290 w2 = src.w2;
291 w3 = src.w3;
292 w4 = src.w4;
293 w5 = src.w5;
294 }
295
296
297 @Override
298 public ObjectId toObjectId() {
299 return this;
300 }
301
302 private void writeObject(ObjectOutputStream os) throws IOException {
303 os.writeInt(w1);
304 os.writeInt(w2);
305 os.writeInt(w3);
306 os.writeInt(w4);
307 os.writeInt(w5);
308 }
309
310 private void readObject(ObjectInputStream ois) throws IOException {
311 w1 = ois.readInt();
312 w2 = ois.readInt();
313 w3 = ois.readInt();
314 w4 = ois.readInt();
315 w5 = ois.readInt();
316 }
317 }