net.quasardb.qdb.ts.Timespec Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of jni Show documentation
API for the JNI components of the QuasarDB API for Java. Should not be included directly.
There is a newer version: 3.14.1
package net.quasardb.qdb.ts;

import java.io.Serializable;
import java.sql.Timestamp;
import java.time.ZoneId;
import java.time.LocalDateTime;
import java.time.Instant;
import java.time.Clock;

import net.quasardb.qdb.jni.*;
import net.quasardb.qdb.exception.InvalidArgumentException;

/**
 * Nanosecond precision time specification for QuasarDB. Allows construction from
 * multiple different clock sources, and interaction with the QuasarDB backend.
 *
 * @see Value
 * @see Row
 */
public class Timespec implements Serializable {
    private static Clock clock = new NanoClock();
    protected long sec;
    protected long nsec;

    /**
     * Construct a new Timespec without any time. Should typically not be used, as
     * these timespec values will be rejected by the QuasarDB backend.
     */
    public Timespec(){
        this.sec = -1;
        this.nsec = -1;
    }

    /**
     * Construct a new timespec from milliseconds.
     */
    public Timespec(long msec) {
        this.sec = msec / 1000;
        this.nsec = (msec % 1000) * 1000000;
    }

    public Timespec(long sec, long nsec){
        this.sec = sec;
        this.nsec = nsec;
    }

    public Timespec (LocalDateTime value) {
        this(value.atZone(ZoneId.systemDefault()).toEpochSecond(),
             value.getNano());
    }

    public Timespec (Timestamp value) {
        this(value.toLocalDateTime());
    }

    public Timespec (Instant value) {
        this(value.getEpochSecond(),
             value.getNano());
    }

    public long getSec() {
        return this.sec;
    }

    public long getNano() {
        return this.nsec;
    }

    public boolean isBefore(Timespec rhs) {
        if (this.sec < rhs.sec) {
            return true;
        } else if (this.sec == rhs.sec &&
            this.nsec < rhs.nsec) {
            return true;
        }

        return false;
    }

    public boolean isEmpty() {
        return this.sec == -1 && this.nsec == -1;
    }

    /**
     * Construct a new Timespec based on a {@link NanoClock} that provides nanosecond
     * precision.
     *
     * @see NanoClock
     */
    public static Timespec now() {
        return new Timespec(Instant.now(Timespec.clock));
    }

    /**
     * Construct a new Timespec using your own custom Clock.
     */
    public static Timespec now(Clock clock) {
        return new Timespec(Instant.now(clock));
    }

    /**
     * Returns copy of this instance with the specified duration in seconds added.
     */
    public Timespec plusSeconds(long secondsToAdd) {
        return new Timespec(this.sec + secondsToAdd,
                            this.nsec);
    }

    /**
     * Returns copy of this instance with the specified duration in nanoseconds added.
     */
    public Timespec plusNanos(long nanosToAdd) {
        return new Timespec(this.sec,
                            this.nsec + nanosToAdd);
    }

    /**
     * Returns copy of this instance with the specified duration in seconds deducted.
     */
    public Timespec minusSeconds(long secondsToDeduct) {
        return new Timespec(this.sec - secondsToDeduct,
                            this.nsec);
    }

    /**
     * Returns copy of this instance with the specified duration in nanoseconds deducted.
     */
    public Timespec minusNanos(long nanosToDeduct) {
        return new Timespec(this.sec,
                            this.nsec - nanosToDeduct);
    }


    /**
     * Converts this Timespec into an {@link Instant}.
     */
    public Instant asInstant() {
        return Instant.ofEpochSecond(this.sec,
                                     this.nsec);
    }

    /**
     * Converts this Timespec into an {@link LocalDateTime}.
     */
    public LocalDateTime asLocalDateTime() {
        return LocalDateTime.ofInstant(this.asInstant(),
                                       ZoneId.systemDefault());
    }

    /**
     * Converts this Timespec into an sql {@link Timestamp}.
     */
    public Timestamp asTimestamp() {
        return Timestamp.valueOf(this.asLocalDateTime());
    }

    @Override
    public boolean equals(Object obj) {
        if (!(obj instanceof Timespec)) return false;
        Timespec rhs = (Timespec)obj;

        return rhs.getSec() == this.sec && rhs.getNano() == this.nsec;
    }

    public String toString() {
        return "Timespec (sec: " + this.sec + ", nsec: " + this.nsec + ")";
    }

    /**
     * Converts this timespec to the number of milliseconds from the epoch of 1970-01-01
     */
    public long toEpochMillis() {
        return (long)(this.sec * 1000) + (long)(this.nsec / 1000000);
    }

    /**
     * Returns the smallest timespec between the two, that is, the time that is pointing
     * towards the earliest point in time.
     */
    public static Timespec min(Timespec lhs, Timespec rhs) {
        if (lhs.sec == -1 && rhs.sec != -1) {
            return rhs;
        }
        if (rhs.sec == -1 && lhs.sec != -1) {
            return lhs;
        }

        if (rhs.sec == -1 && lhs.sec == -1) {
            throw new InvalidArgumentException("Both time ranges are null.");
        }

        if (lhs.sec < rhs.sec) {
            return lhs;
        }

        if (rhs.sec < lhs.sec) {
            return rhs;
        }

        // lhs.sec == rhs.sec
        if (lhs.nsec < rhs.nsec) {
            return lhs;
        }

        return rhs;
    }

    /**
     * Returns the smallest timespec between the two, that is, the time that is pointing
     * towards the latest point in time.
     */
    public static Timespec max(Timespec lhs, Timespec rhs) {
        if (lhs.sec == -1 && rhs.sec != -1) {
            return rhs;
        }
        if (rhs.sec == -1 && lhs.sec != -1) {
            return lhs;
        }

        if (rhs.sec == -1 && lhs.sec == -1) {
            throw new InvalidArgumentException("Both time ranges are null.");
        }

        if (lhs.sec > rhs.sec) {
            return lhs;
        }
        if (rhs.sec > lhs.sec) {
            return rhs;
        }

        // lhs.sec == rhs.sec
        if (lhs.nsec > rhs.nsec) {
            return lhs;
        }

        return rhs;
    }

}