Java Code Examples for com.google.common.hash.Hashing#goodFastHash()
The following examples show how to use
com.google.common.hash.Hashing#goodFastHash() .
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Example 1
Source File: Hasher.java From datafu with Apache License 2.0 | 6 votes |
/** * Returns the HashFunction named by algorithm * * See the Hasher class docs for a list of algorithms and guidance on selection. * * @param algorithm the hash algorithm to use * @throws IllegalArgumentException for an invalid seed given the algorithm * @throws RuntimeException when the seed cannot be parsed */ private void makeHashFunc(String algorithm) throws IllegalArgumentException, RuntimeException { if (hash_func != null) { throw new RuntimeException("The hash function should only be set once per instance"); } if (algorithm.startsWith("good-")) { int bits = Integer.parseInt(algorithm.substring(5)); hash_func = Hashing.goodFastHash(bits); } else if (algorithm.equals("murmur3-32")) { hash_func = Hashing.murmur3_32(); } else if (algorithm.equals("murmur3-128")){ hash_func = Hashing.murmur3_128(); } else if (algorithm.equals("sip24")) { hash_func = Hashing.sipHash24(); } else if (algorithm.equals("sha1")) { hash_func = Hashing.sha1(); } else if (algorithm.equals("sha256")) { hash_func = Hashing.sha256(); } else if (algorithm.equals("sha512")) { hash_func = Hashing.sha512(); } else if (algorithm.equals("md5")) { hash_func = Hashing.md5(); } else if (algorithm.equals("adler32")) { hash_func = Hashing.adler32(); } else if (algorithm.equals("crc32")) { hash_func = Hashing.crc32(); } else { throw new IllegalArgumentException("No hash function found for algorithm "+algorithm+". Allowed values include "+HASH_NAMES); } }
Example 2
Source File: ResultsMerger.java From splicer with Apache License 2.0 | 5 votes |
public long signatureOf(TsdbResult result) { HashFunction hf = Hashing.goodFastHash(64); Hasher hasher = hf.newHasher(); List<String> aggTags = result.getAggregateTags(); if (aggTags != null) { List<String> sortedAggTags = Lists.newArrayList(aggTags); Collections.sort(sortedAggTags); for (String aggTag: sortedAggTags) { hasher.putString(aggTag, Charset.forName("ISO-8859-1")); } } Map<String, String> tags; if (result.getTags() != null && (tags = result.getTags().getTags()) != null) { List<String> tagTokens = Lists.newArrayList(tags.keySet()); Collections.sort(tagTokens); for (String s: tagTokens) { hasher.putString(s, Charset.forName("ISO-8859-1")); hasher.putString(tags.get(s), Charset.forName("ISO-8859-1")); } } List<String> tsuids = result.getTsuids(); if (tsuids != null) { List<String> sortedTsUIDs = Lists.newArrayList(tsuids); Collections.sort(sortedTsUIDs); for (String tsuid: sortedTsUIDs) { hasher.putString(tsuid, Charset.forName("ISO-8859-1")); } } return hasher.hash().asLong(); }
Example 3
Source File: SkipScanFilter.java From phoenix with Apache License 2.0 | 5 votes |
@Override public int hashCode() { HashFunction hf = Hashing.goodFastHash(32); Hasher h = hf.newHasher(); h.putInt(slots.size()); for (int i=0; i<slots.size(); i++) { h.putInt(slots.get(i).size()); for (int j=0; j<slots.size(); j++) { h.putBytes(slots.get(i).get(j).getLowerRange()); h.putBytes(slots.get(i).get(j).getUpperRange()); } } return h.hash().asInt(); }
Example 4
Source File: SkipScanFilter.java From phoenix with Apache License 2.0 | 5 votes |
@Override public int hashCode() { HashFunction hf = Hashing.goodFastHash(32); Hasher h = hf.newHasher(); h.putInt(slots.size()); for (int i=0; i<slots.size(); i++) { h.putInt(slots.get(i).size()); for (int j=0; j<slots.size(); j++) { h.putBytes(slots.get(i).get(j).getLowerRange()); h.putBytes(slots.get(i).get(j).getUpperRange()); } } return h.hash().asInt(); }
Example 5
Source File: SkipScanFilter.java From phoenix with BSD 3-Clause "New" or "Revised" License | 5 votes |
@Override public int hashCode() { HashFunction hf = Hashing.goodFastHash(32); Hasher h = hf.newHasher(); h.putInt(slots.size()); for (int i=0; i<slots.size(); i++) { h.putInt(slots.get(i).size()); for (int j=0; j<slots.size(); j++) { h.putBytes(slots.get(i).get(j).getLowerRange()); h.putBytes(slots.get(i).get(j).getUpperRange()); } } return h.hash().asInt(); }
Example 6
Source File: RangeSplit.java From datawave with Apache License 2.0 | 4 votes |
@Override public int hashCode() { HashFunction hf = Hashing.goodFastHash(64); return hf.newHasher().putObject(this, strategy).hash().asInt(); }
Example 7
Source File: HashableTest.java From metanome-algorithms with Apache License 2.0 | 4 votes |
@Test public void test() { HashFunction function = Hashing.goodFastHash(10); assertThat(Hasher.of(function).put(new TestHashable()).hash()) .isEqualTo(function.newHasher().putUnencodedChars(TestHashable.class.getName()).hash()); }
Example 8
Source File: KeyHasher.java From EVCache with Apache License 2.0 | 4 votes |
public static String getHashedKey(String key, String hashingAlgorithm) { final long start = System.nanoTime(); HashFunction hf = null; switch(hashingAlgorithm.toLowerCase()) { case "murmur3" : hf = Hashing.murmur3_128(); break; case "adler32" : hf = Hashing.adler32(); break; case "crc32" : hf = Hashing.crc32(); break; case "sha1" : hf = Hashing.sha1(); break; case "sha256" : hf = Hashing.sha256(); break; case "siphash24" : hf = Hashing.sipHash24(); break; case "goodfasthash" : hf = Hashing.goodFastHash(128); break; case "md5" : default : hf = Hashing.md5(); break; } final HashCode hc = hf.newHasher().putString(key, Charsets.UTF_8).hash(); final byte[] digest = hc.asBytes(); if(log.isDebugEnabled()) log.debug("Key : " + key +"; digest length : " + digest.length + "; byte Array contents : " + Arrays.toString(digest) ); final String hKey = encoder.encodeToString(digest); if(log.isDebugEnabled()) log.debug("Key : " + key +"; Hashed & encoded key : " + hKey + "; Took " + (System.nanoTime() - start) + " nanos"); return hKey; }