Java 类com.google.protobuf.ByteString.ByteIterator 实例源码

/**
 * {@link ByteKey} implements {@link Comparable Comparable<ByteKey>} by comparing the
 * arrays in lexicographic order. The smallest {@link ByteKey} is a zero-length array; the
 * successor to a key is the same key with an additional 0 byte appended; and keys have unbounded
 * size.
 */
@Override
public int compareTo(@Nonnull ByteKey other) {
  checkNotNull(other, "other");
  ByteIterator thisIt = value.iterator();
  ByteIterator otherIt = other.value.iterator();
  while (thisIt.hasNext() && otherIt.hasNext()) {
    // (byte & 0xff) converts [-128,127] bytes to [0,255] ints.
    int cmp = (thisIt.nextByte() & 0xff) - (otherIt.nextByte() & 0xff);
    if (cmp != 0) {
      return cmp;
    }
  }
  // If we get here, the prefix of both arrays is equal up to the shorter array. The array with
  // more bytes is larger.
  return value.size() - other.value.size();
}

@Override
public String toString() {
  char[] encoded = new char[2 * value.size() + 2];
  encoded[0] = '[';
  int cnt = 1;
  ByteIterator iterator = value.iterator();
  while (iterator.hasNext()) {
    byte b = iterator.nextByte();
    encoded[cnt] = HEX[(b & 0xF0) >>> 4];
    ++cnt;
    encoded[cnt] = HEX[b & 0xF];
    ++cnt;
  }
  encoded[cnt] = ']';
  return new String(encoded);
}

int compare(ByteString a, ByteString b) {
    ByteIterator itA = a.iterator();
    ByteIterator itB = b.iterator();

    while (itA.hasNext()) {
        if (!itB.hasNext()) {
            return -1;
        }

        int bA = itA.nextByte() & 0xff;
        int bB = itB.nextByte() & 0xff;

        int c = Integer.compare(bA, bB);

        if (c != 0) {
            return c;
        }
    }

    if (itB.hasNext()) {
        return 1;
    }

    return 0;
}

public static String toHex(ByteString key) {
  StringBuilder sb = new StringBuilder();

  ByteIterator iterator = key.iterator();
  while (iterator.hasNext()) {
    int v = iterator.nextByte() & 0xff;
    sb.append(HEX[v >> 4]);
    sb.append(HEX[v & 0xf]);
  }

  return sb.toString();
}