src/temporal/ValueRange.js
/**
* @copyright (c) 2016, Philipp Thuerwaechter & Pattrick Hueper
* @copyright (c) 2007-present, Stephen Colebourne & Michael Nascimento Santos
* @license BSD-3-Clause (see LICENSE in the root directory of this source tree)
*/
import {assert} from '../assert';
import {DateTimeException, IllegalArgumentException} from '../errors';
import {MathUtil} from '../MathUtil';
/**
* The range of valid values for a date-time field.
*
* All TemporalField instances have a valid range of values.
* For example, the ISO day-of-month runs from 1 to somewhere between 28 and 31.
* This class captures that valid range.
*
* It is important to be aware of the limitations of this class.
* Only the minimum and maximum values are provided.
* It is possible for there to be invalid values within the outer range.
* For example, a weird field may have valid values of 1, 2, 4, 6, 7, thus
* have a range of '1 - 7', despite that fact that values 3 and 5 are invalid.
*
* Instances of this class are not tied to a specific field.
*/
export class ValueRange {
/**
*
* @param {!number} minSmallest
* @param {!number} minLargest
* @param {!number} maxSmallest
* @param {!number} maxLargest
*/
constructor(minSmallest, minLargest, maxSmallest, maxLargest) {
assert(!(minSmallest > minLargest), 'Smallest minimum value \'' + minSmallest +
'\' must be less than largest minimum value \'' + minLargest + '\'', IllegalArgumentException);
assert(!(maxSmallest > maxLargest), 'Smallest maximum value \'' + maxSmallest +
'\' must be less than largest maximum value \'' + maxLargest + '\'', IllegalArgumentException);
assert(!(minLargest > maxLargest), 'Minimum value \'' + minLargest +
'\' must be less than maximum value \'' + maxLargest + '\'', IllegalArgumentException);
this._minSmallest = minSmallest;
this._minLargest = minLargest;
this._maxLargest = maxLargest;
this._maxSmallest = maxSmallest;
}
/**
* Is the value range fixed and fully known.
* <p>
* For example, the ISO day-of-month runs from 1 to between 28 and 31.
* Since there is uncertainty about the maximum value, the range is not fixed.
* However, for the month of January, the range is always 1 to 31, thus it is fixed.
*
* @return {boolean} true if the set of values is fixed
*/
isFixed() {
return this._minSmallest === this._minLargest && this._maxSmallest === this._maxLargest;
}
/**
*
* @returns {number}
*/
minimum(){
return this._minSmallest;
}
/**
*
* @returns {number}
*/
largestMinimum(){
return this._minLargest;
}
/**
*
* @returns {number}
*/
maximum(){
return this._maxLargest;
}
/**
*
* @returns {number}
*/
smallestMaximum(){
return this._maxSmallest;
}
/**
*
* @returns {boolean}
*/
isValidValue(value) {
return (this.minimum() <= value && value <= this.maximum());
}
/**
*
* @param {number} value
* @param {TemporalField} field
*/
checkValidValue(value, field) {
var msg;
if (!this.isValidValue(value)) {
if (field != null) {
msg = ('Invalid value for ' + field + ' (valid values ' + (this.toString()) + '): ') + value;
} else {
msg = ('Invalid value (valid values ' + (this.toString()) + '): ') + value;
}
return assert(false, msg, DateTimeException);
}
}
/**
* Checks that the specified value is valid and fits in an {@code int}.
* <p>
* This validates that the value is within the valid range of values and that
* all valid values are within the bounds of an {@code int}.
* The field is only used to improve the error message.
*
* @param {number} value - the value to check
* @param {TemporalField} field - the field being checked, may be null
* @return {number} the value that was passed in
* @see #isValidIntValue(long)
*/
checkValidIntValue(value, field) {
if (this.isValidIntValue(value) === false) {
throw new DateTimeException('Invalid int value for ' + field + ': ' + value);
}
return value;
}
/**
* Checks if the value is within the valid range and that all values
* in the range fit in an {@code int}.
* <p>
* This method combines {@link #isIntValue()} and {@link #isValidValue(long)}.
*
* @param {number} value - the value to check
* @return true if the value is valid and fits in an {@code int}
*/
isValidIntValue(value) {
return this.isIntValue() && this.isValidValue(value);
}
/**
* Checks if all values in the range fit in an {@code int}.
* <p>
* This checks that all valid values are within the bounds of an {@code int}.
* <p>
* For example, the ISO month-of-year has values from 1 to 12, which fits in an {@code int}.
* By comparison, ISO nano-of-day runs from 1 to 86,400,000,000,000 which does not fit in an {@code int}.
* <p>
* This implementation uses {@link #getMinimum()} and {@link #getMaximum()}.
*
* @return boolean if a valid value always fits in an {@code int}
*/
isIntValue() { // should be isSafeIntegerValue
return this.minimum() >= MathUtil.MIN_SAFE_INTEGER && this.maximum() <= MathUtil.MAX_SAFE_INTEGER;
}
/**
* Checks if this range is equal to another range.
* <p>
* The comparison is based on the four values, minimum, largest minimum,
* smallest maximum and maximum.
* Only objects of type {@code ValueRange} are compared, other types return false.
*
* @param {*} other - the object to check, null returns false
* @return {boolean} true if this is equal to the other range
*/
equals(other) {
if (other === this) {
return true;
}
if (other instanceof ValueRange) {
return this._minSmallest === other._minSmallest && this._minLargest === other._minLargest &&
this._maxSmallest === other._maxSmallest && this._maxLargest === other._maxLargest;
}
return false;
}
/**
* A hash code for this range.
*
* @return {number} a suitable hash code
*/
hashCode() {
var hash = this._minSmallest + this._minLargest << 16 + this._minLargest >> 48 + this._maxSmallest << 32 +
this._maxSmallest >> 32 + this._maxLargest << 48 + this._maxLargest >> 16;
return (hash ^ (hash >>> 32));
}
/*
* Outputs this range as a String.
*
* The format will be '{min}/{largestMin} - {smallestMax}/{max}',
* where the largestMin or smallestMax sections may be omitted, together
* with associated slash, if they are the same as the min or max.
*
* @return {string} a string representation of this range, not null
*/
toString() {
var str = this.minimum() + (this.minimum() !== this.largestMinimum() ? '/' + (this.largestMinimum()) : '');
str += ' - ';
str += this.smallestMaximum() + (this.smallestMaximum() !== this.maximum() ? '/' + (this.maximum()) : '');
return str;
}
/*
* called with 2 params: Obtains a fixed value range.
*
* This factory obtains a range where the minimum and maximum values are fixed.
* For example, the ISO month-of-year always runs from 1 to 12.
*
* @param min the minimum value
* @param max the maximum value
* @return the ValueRange for min, max, not null
* called with 3 params: Obtains a variable value range.
*
* This factory obtains a range where the minimum value is fixed and the maximum value may vary.
* For example, the ISO day-of-month always starts at 1, but ends between 28 and 31.
*
* @param min the minimum value
* @param maxSmallest the smallest maximum value
* @param maxLargest the largest maximum value
* @return the ValueRange for min, smallest max, largest max, not null
* called with 4 params: Obtains a fully variable value range.
*
* This factory obtains a range where both the minimum and maximum value may vary.
*
* @param minSmallest the smallest minimum value
* @param minLargest the largest minimum value
* @param maxSmallest the smallest maximum value
* @param maxLargest the largest maximum value
*
* @return {ValueRange} the ValueRange for smallest min, largest min, smallest max, largest max, not null
*/
static of() {
if (arguments.length === 2) {
return new ValueRange(arguments[0], arguments[0], arguments[1], arguments[1]);
} else if (arguments.length === 3) {
return new ValueRange(arguments[0], arguments[0], arguments[1], arguments[2]);
} else if (arguments.length === 4) {
return new ValueRange(arguments[0], arguments[1], arguments[2], arguments[3]);
} else {
return assert(false, 'Invalid number of arguments ' + arguments.length, IllegalArgumentException);
}
}
}
