How to use

AbstractHashFunction

in

com.google.common.hash

@Override
public HashCode hashBytes(byte[] input) {
 return hashBytes(input, 0, input.length);
}

 @Override
 public Hasher newHasher(int expectedInputSize) {
  checkArgument(
    expectedInputSize >= 0, "expectedInputSize must be >= 0 but was %s", expectedInputSize);
  return newHasher();
 }
}

 @Override
 public Hasher newHasher(int expectedInputSize) {
  checkArgument(
    expectedInputSize >= 0, "expectedInputSize must be >= 0 but was %s", expectedInputSize);
  return newHasher();
 }
}

@Override
public HashCode hashBytes(byte[] input) {
 return hashBytes(input, 0, input.length);
}

@Override
public HashCode hashUnencodedChars(CharSequence input) {
 int len = input.length();
 return newHasher(len * 2).putUnencodedChars(input).hash();
}

@Override
public HashCode hashBytes(byte[] input) {
 return hashBytes(input, 0, input.length);
}

@Override
public HashCode hashBytes(ByteBuffer input) {
 return newHasher(input.remaining()).putBytes(input).hash();
}

@Override
public HashCode hashBytes(byte[] input) {
 return hashBytes(input, 0, input.length);
}

@Override
public <T> HashCode hashObject(T instance, Funnel<? super T> funnel) {
 return newHasher().putObject(instance, funnel).hash();
}

@Override
public HashCode hashBytes(byte[] input) {
 return hashBytes(input, 0, input.length);
}

@Override
public HashCode hashString(CharSequence input, Charset charset) {
 return newHasher().putString(input, charset).hash();
}

@Override
public HashCode hashInt(int input) {
 return newHasher(4).putInt(input).hash();
}

@Override
public HashCode hashLong(long input) {
 return newHasher(8).putLong(input).hash();
}

 @Override
 public Hasher newHasher(int expectedInputSize) {
  checkArgument(
    expectedInputSize >= 0, "expectedInputSize must be >= 0 but was %s", expectedInputSize);
  return newHasher();
 }
}

@Override
public HashCode hashBytes(byte[] input, int off, int len) {
 checkPositionIndexes(off, off + len, input.length);
 return newHasher(len).putBytes(input, off, len).hash();
}

@Override
public HashCode hashUnencodedChars(CharSequence input) {
 int len = input.length();
 return newHasher(len * 2).putUnencodedChars(input).hash();
}

@Override
public HashCode hashLong(long input) {
 return newHasher(8).putLong(input).hash();
}

@Override
public HashCode hashString(CharSequence input, Charset charset) {
 return newHasher().putString(input, charset).hash();
}

@Override
public HashCode hashBytes(ByteBuffer input) {
 return newHasher(input.remaining()).putBytes(input).hash();
}

@Override
public HashCode hashInt(int input) {
 return newHasher(4).putInt(input).hash();
}