Examples of com.google.common.hash.Hasher

com.google.common.hash.Hasher
A {@link PrimitiveSink} that can compute a hash code after reading the input. Each hasher shouldtranslate all multibyte values ( {@link #putInt(int)}, {@link #putLong(long)}, etc) to bytes in little-endian order.
Warning: The result of calling any methods after calling {@link #hash} is undefined.
Warning: Using a specific character encoding when hashing a {@link CharSequence} with{@link #putString(CharSequence,Charset)} is generally only useful for cross-languagecompatibility (otherwise prefer {@link #putUnencodedChars}). However, the character encodings must be identical across languages. Also beware that {@link Charset} definitions may occasionallychange between Java releases.
Warning: Chunks of data that are put into the {@link Hasher} are not delimited.The resulting {@link HashCode} is dependent only on the bytes inserted, and the order in whichthey were inserted, not how those bytes were chunked into discrete put() operations. For example, the following three expressions all generate colliding hash codes:
```
    {@code newHasher().putByte(b1).putByte(b2).putByte(b3).hash()}newHasher().putByte(b1).putBytes(new byte[]  b2, b3 }).hash() newHasher().putBytes(new byte[] { b1, b2, b3 }).hash()}
```
If you wish to avoid this, you should either prepend or append the size of each chunk. Keep in mind that when dealing with char sequences, the encoded form of two concatenated char sequences is not equivalent to the concatenation of their encoded form. Therefore, {@link #putString(CharSequence,Charset)} should only be used consistently with completesequences and not broken into chunks. @author Kevin Bourrillion @since 11.0

        // Blobs are immutable so we can safely cache the hash
        if (!hashCode.isPresent()) {
            InputStream is = getNewStream();
            try {
                try {
                    Hasher hasher = Hashing.sha256().newHasher();
                    byte[] buf = new byte[0x1000];
                    int r;
                    while((r = is.read(buf)) != -1) {
                        hasher.putBytes(buf, 0, r);
                    }
                    hashCode = Optional.of(hasher.hash());
                }
                catch (IOException e) {
                    log.warn("Error while hashing stream", e);
                }
            }

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    public IntArray(int[] data) {
        this.data = data;


        Hasher hasher = hashFunction.newHasher();
        for(int i : data) {
            hasher.putInt(i);
        }
        goodHashCode = hasher.hash();
    }

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      return null;
    }
    FrameHeader header = frame.getHeader();
    byte[][] chunks = new byte[header.getChunkCount()][];


    Hasher hasher = hashFunction.newHasher();
    for (int i = 0; i < header.getChunkCount(); i++) {
      if (!entries.hasNext()) {
        logBadFrame(header, i);
        return null;
      }
      LogEntry logEntry = decodeLogEntry(entries.next());
      if (!isFrame(logEntry)) {
        logBadFrame(header, i);
        return logEntry;
      }
      Frame chunkFrame = logEntry.getFrame();
      if (!isChunk(chunkFrame)) {
        logBadFrame(header, i);
        return logEntry;
      }
      byte[] chunkData = chunkFrame.getChunk().getData();
      hasher.putBytes(chunkData);
      chunks[i] = chunkData;
    }
    if (!Arrays.equals(header.getChecksum(), hasher.hash().asBytes())) {
      throw new CodingException("Read back a framed log entry that failed its checksum");
    }
    return Entries.thriftBinaryDecode(Bytes.concat(chunks));
  }

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  }


  public static HashCode hash(InputSupplier paramInputSupplier, HashFunction paramHashFunction)
    throws IOException
  {
    Hasher localHasher = paramHashFunction.newHasher();
    return (HashCode)readBytes(paramInputSupplier, new ByteProcessor()
    {
      public boolean processBytes(byte[] paramAnonymousArrayOfByte, int paramAnonymousInt1, int paramAnonymousInt2)
      {
        this.val$hasher.putBytes(paramAnonymousArrayOfByte, paramAnonymousInt1, paramAnonymousInt2);

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            writer.print(labelsJsAfter);
        }
    }


    protected static void handleETagFor(RestxRequest req, RestxResponse resp, Iterable<Entry<String, String>> entries) {
        Hasher hasher = Hashing.sha1().newHasher();
        for (Entry<String, String> entry : entries) {
            hasher.putString(entry.getKey(), Charsets.UTF_8).putString(entry.getValue(), Charsets.UTF_8);
        }
        new ETag(hasher.hash().toString(), CacheControl.MUST_REVALIDATE).handleIn(req, resp);
    }

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