diffusion/src/node_modules/features/time-series/range.js

Diffusion JavaScript client

var Point = require('features/time-series/point');

function Range(anchor, end) {
    this.anchor = anchor;
    this.span = end;

    this.equals = function(other) {
        if (other && other instanceof Range) {
            return this.anchor.equals(other.anchor) &&
                   this.span.equals(other.span);
        }

        return false;
    };

    this.from = function(start) {
        return new Range(Point.at(start), this.span);
    };

    this.fromStart = function() {
        return new Range(Point.atStart(), this.span);
    };

    this.fromLast = function(count) {
        return new Range(Point.offset(count), this.span);
    };

    this.fromLastMillis = function(timespan) {
        return new Range(Point.offsetMillis(timespan), this.span);
    };

    this.to = function(sequence) {
        return new Range(this.anchor, Point.at(sequence));
    };

    this.toStart = function() {
        return new Range(this.anchor, Point.atStart());
    };

    this.untilLast = function(count) {
        return new Range(this.anchor, Point.offset(count));
    };

    this.untilLastMillis = function(timespan) {
        return new Range(this.anchor, Point.offsetMillis(timespan));
    };

    this.next = function(count) {
        return new Range(anchor, Point.next(count));
    };

    this.nextMillis = function(timespan) {
        return new Range(this.anchor, Point.nextMillis(timespan));
    };

    this.previous = function(count) {
        return new Range(this.anchor, Point.previous(count));
    };

    this.previousMillis = function(timespan) {
        return new Range(this.anchor, Point.previousMillis(timespan));
    };
}

Range.DEFAULT_RANGE = new Range(Point.atStart(), Point.offset(0));

Range.prototype.toString = function() {
    var s = "";

    if (!this.anchor.equals(Range.DEFAULT_RANGE.anchor)) {
        s += this.anchor.toAnchorDescription();
    }

    if (!this.span.equals(Range.DEFAULT_RANGE.span)) {
        s += this.span.toSpanDescription();
    }

    return s;
};

module.exports = Range;