Class MutableDataPoint

src/core/MutableDataPoint.java:19–150

A mutable DataPoint that stores a value and a timestamp.

 * A mutable {@link DataPoint} that stores a value and a timestamp.
 */
public final class MutableDataPoint implements DataPoint {

  // NOTE: Fields are not final to make an instance available to store a new
  // pair of a timestamp and a value to reduce memory burden.
  /** The timestamp of the value. */
  private long timestamp = Long.MAX_VALUE;
  /** True if the value is stored as a long. */
  private boolean is_integer = true;
  /** A long value or a double encoded on a long if {@code is_integer} is false. */
  private long value = 0;

  /**
   * Resets with a new pair of a timestamp and a double value.
   *
   * @param timestamp A timestamp.
   * @param value A double value.
   */
  public void reset(final long timestamp, final double value) {
    this.timestamp = timestamp;
    this.is_integer = false;
    this.value = Double.doubleToRawLongBits(value);
  }

  /**
   * Resets with a new pair of a timestamp and a long value.
   *
   * @param timestamp A timestamp.
   * @param value A double value.
   */
  public void reset(final long timestamp, final long value) {
    this.timestamp = timestamp;
    this.is_integer = true;
    this.value = value;
  }

  /**
   * Resets with a new data point.
   *
   * @param dp A new data point to store.
   */
  public void reset(DataPoint dp) {
    this.timestamp = dp.timestamp();
    this.is_integer = dp.isInteger();
    if (is_integer) {
      this.value = dp.longValue();
    } else {
      this.value = Double.doubleToRawLongBits(dp.doubleValue());
    }
  }

  /**
   * Resets with a new pair of a timestamp and a double value.
   *
   * @param timestamp A timestamp.
   * @param value A double value.
   */
  public static MutableDataPoint ofDoubleValue(final long timestamp,
                                               final double value) {