QuantityValue::getLowerBound() - Code Metrics - Inspection of "Factor UnboundedQuantityValue out of QuantityValue" - DataValues/Number - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#66)

by Daniel

created 2016-07-09 17:42 UTC

QuantityValue::getLowerBound() A

↳ Parent: QuantityValue

Complexity

Conditions	1
Paths	1

Size

Total Lines	3
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Importance

Changes	2
Bugs	0	Features	0

Metric	Value
c	2
b	0
f	0
dl	0
loc	3
rs	10
cc	1
eloc	2
nc	1
nop	0

<?php

namespace DataValues;

use InvalidArgumentException;

/**
 * Class representing a quantity with associated unit and uncertainty interval.
 * The amount is stored as a @see DecimalValue object.
 *
 * @see UnboundedQuantityValue For quantities with no known uncertainty interval.
 * For simple numeric amounts use @see NumberValue.
 *
 * @note UnboundedQuantityValue and QuantityValue both use the value type ID "quantity".
 * The fact that we use subclassing to model the bounded vs the unbounded case should be
 * considered an implementation detail.
 *
 * @since 0.1
 *
 * @license GPL-2.0+
 * @author Daniel Kinzler
 */
class QuantityValue extends UnboundedQuantityValue {

	/**
	 * The quantity's upper bound
	 *
	 * @var DecimalValue
	 */
	private $upperBound;

	/**
	 * The quantity's lower bound
	 *
	 * @var DecimalValue
	 */
	private $lowerBound;

	/**
	 * @param DecimalValue $amount
	 * @param string $unit A unit identifier. Must not be empty, use "1" for unit-less quantities.
	 * @param DecimalValue $upperBound The upper bound of the quantity, inclusive.
	 * @param DecimalValue $lowerBound The lower bound of the quantity, inclusive.
	 *
	 * @throws IllegalValueException
	 */
	public function __construct( DecimalValue $amount, $unit, DecimalValue $upperBound, DecimalValue $lowerBound ) {
		parent::__construct( $amount, $unit );

		if ( $lowerBound->compare( $amount ) > 0 ) {
function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);
			throw new IllegalValueException( '$lowerBound ' . $lowerBound->getValue() . ' must be <= $amount ' . $amount->getValue() );
		}

		if ( $upperBound->compare( $amount ) < 0 ) {
function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);
			throw new IllegalValueException( '$upperBound ' . $upperBound->getValue() . ' must be >= $amount ' . $amount->getValue() );
		}

		$this->upperBound = $upperBound;
		$this->lowerBound = $lowerBound;
	}

	/**
	 * Returns a QuantityValue representing the given amount.
	 * If no upper or lower bound is given, the amount is assumed to be absolutely exact,
	 * that is, the amount itself will be used as the upper and lower bound.
	 *
	 * This is a convenience wrapper around the constructor that accepts native values
	 * instead of DecimalValue objects.
	 *
	 * @note: if the amount or a bound is given as a string, the string must conform
	 * to the rules defined by @see DecimalValue.
	 *
	 * @since 0.1
	 *
	 * @param string|int|float|DecimalValue $amount
	 * @param string $unit A unit identifier. Must not be empty, use "1" for unit-less quantities.
	 * @param string|int|float|DecimalValue|null $upperBound
	 * @param string|int|float|DecimalValue|null $lowerBound
	 *
	 * @return self
	 * @throws IllegalValueException
	 */
	public static function newFromNumber( $amount, $unit = '1', $upperBound = null, $lowerBound = null ) {
		$amount = self::asDecimalValue( 'amount', $amount );
		$upperBound = self::asDecimalValue( 'upperBound', $upperBound, $amount );
		$lowerBound = self::asDecimalValue( 'lowerBound', $lowerBound, $amount );

		return new self( $amount, $unit, $upperBound, $lowerBound );
	}

	/**
	 * @see newFromNumber
	 *
	 * @deprecated since 0.1, use newFromNumber instead
	 *
	 * @param string|int|float|DecimalValue $amount
	 * @param string $unit
	 * @param string|int|float|DecimalValue|null $upperBound
	 * @param string|int|float|DecimalValue|null $lowerBound
	 *
	 * @return self
	 */
	public static function newFromDecimal( $amount, $unit = '1', $upperBound = null, $lowerBound = null ) {
		return self::newFromNumber( $amount, $unit, $upperBound, $lowerBound );
	}

	/**
	 * @see Serializable::serialize
	 *
	 * @since 0.1
	 *
	 * @return string
	 */
	public function serialize() {
		return serialize( array(
			$this->amount,
			$this->unit,
			$this->upperBound,
			$this->lowerBound,
		) );
	}

	/**
	 * @see Serializable::unserialize
	 *
	 * @since 0.1
	 *
	 * @param string $data
	 */
	public function unserialize( $data ) {
		list( $amount, $unit, $upperBound, $lowerBound ) = unserialize( $data );
		$this->__construct( $amount, $unit, $upperBound, $lowerBound );
	}

	/**
	 * Returns this quantity's upper bound.
	 *
	 * @since 0.1
	 *
	 * @return DecimalValue
	 */
	public function getUpperBound() {
		return $this->upperBound;
	}

	/**
	 * Returns this quantity's lower bound.
	 *
	 * @since 0.1
	 *
	 * @return DecimalValue
	 */
	public function getLowerBound() {
		return $this->lowerBound;
	}

	/**
	 * Returns the size of the uncertainty interval.
	 * This can roughly be interpreted as "amount +/- uncertainty/2".
	 *
	 * The exact interpretation of the uncertainty interval is left to the concrete application or
	 * data point. For example, the uncertainty interval may be defined to be that part of a
	 * normal distribution that is required to cover the 95th percentile.
	 *
	 * @since 0.1
	 *
	 * @return float
	 */
	public function getUncertainty() {
		return $this->upperBound->getValueFloat() - $this->lowerBound->getValueFloat();
	}

	/**
	 * Returns a DecimalValue representing the symmetrical offset to be applied
	 * to the raw amount for a rough representation of the uncertainty interval,
	 * as in "amount +/- offset".
	 *
	 * The offset is calculated as max( amount - lowerBound, upperBound - amount ).
	 *
	 * @todo Should be factored out into a separate QuantityMath class.
	 *
	 * @since 0.1
	 *
	 * @return DecimalValue
	 */
	public function getUncertaintyMargin() {
		$math = new DecimalMath();

		$lowerMargin = $math->sum( $this->amount, $this->lowerBound->computeComplement() );
		$upperMargin = $math->sum( $this->upperBound, $this->amount->computeComplement() );

		$margin = $math->max( $lowerMargin, $upperMargin );
		return $margin;
	}

	/**
	 * Returns the order of magnitude of the uncertainty as the exponent of
	 * last significant digit in the amount-string. The value returned by this
	 * is suitable for use with @see DecimalMath::roundToExponent().
	 *
	 * @example: if two digits after the decimal point are significant, this
	 * returns -2.
	 *
	 * @example: if the last two digits before the decimal point are insignificant,
	 * this returns 2.
	 *
	 * Note that this calculation assumes a symmetric uncertainty interval,
	 * and can be misleading.
	 *
	 * @todo Should be factored out into a separate QuantityMath class.
	 *
	 * @since 0.1
	 *
	 * @return int
	 */
	public function getOrderOfUncertainty() {
		// the desired precision is given by the distance between the amount and
		// whatever is closer, the upper or lower bound.
		//TODO: use DecimalMath to avoid floating point errors!
		$amount = $this->amount->getValueFloat();
		$upperBound = $this->upperBound->getValueFloat();
		$lowerBound = $this->lowerBound->getValueFloat();
		$precision = min( $amount - $lowerBound, $upperBound - $amount );

		if ( $precision === 0.0 ) {
			// If there is no uncertainty, the order of uncertainty is a bit more than what we have digits for.
			return -strlen( $this->amount->getFractionalPart() );
		}

		// e.g. +/- 200 -> 2; +/- 0.02 -> -2
		// note: we really want floor( log10( $precision ) ), but have to account for
		// small errors made in the floating point operations above.
		// @todo: use bcmath (via DecimalMath) to avoid this if possible
		$orderOfUncertainty = floor( log10( $precision + 0.0000000005 ) );

		return (int)$orderOfUncertainty;
	}

	/**
	 * Returns a transformed value derived from this QuantityValue by applying
	 * the given transformation to the amount and the upper and lower bounds.
	 * The resulting amount and bounds are rounded to the significant number of
	 * digits. Note that for exact quantities (with at least one bound equal to
	 * the amount), no rounding is applied (since they are considered to have
	 * infinite precision).
	 *
	 * The transformation is provided as a callback, which must implement a
	 * monotonously increasing, fully differentiable function mapping a DecimalValue
	 * to a DecimalValue. Typically, it will be a linear transformation applying a
	 * factor and an offset.
	 *
	 * @param string $newUnit The unit of the transformed quantity.
	 *
	 * @param callable $transformation A callback that implements the desired transformation.
	 *        The transformation will be called three times, once for the amount, once
	 *        for the lower bound, and once for the upper bound. It must return a DecimalValue.
	 *        The first parameter passed to $transformation is the DecimalValue to transform
	 *        In addition, any extra parameters passed to transform() will be passed through
	 *        to the transformation callback.
	 *
	 * @param mixed ... Any extra parameters will be passed to the $transformation function.
	 *
	 * @todo share more code with UnboundQuantityValue::transform.
	 * @todo Should be factored out into a separate QuantityMath class.
	 *
	 * @throws InvalidArgumentException
	 * @return self
	 */
	public function transform( $newUnit, $transformation ) {
		if ( !is_callable( $transformation ) ) {
			throw new InvalidArgumentException( '$transformation must be callable.' );
		}

		if ( !is_string( $newUnit ) ) {
			throw new InvalidArgumentException( '$newUnit must be a string. Use "1" as the unit for unit-less quantities.' );
		}

		if ( $newUnit === '' ) {
			throw new InvalidArgumentException( '$newUnit must not be empty. Use "1" as the unit for unit-less quantities.' );
		}

		$oldUnit = $this->unit;

		if ( $newUnit === null ) {
			$newUnit = $oldUnit;
		}

		// Apply transformation by calling the $transform callback.
		// The first argument for the callback is the DataValue to transform. In addition,
		// any extra arguments given for transform() are passed through.
		$args = func_get_args();
		array_shift( $args );

		$args[0] = $this->amount;
		$amount = call_user_func_array( $transformation, $args );

		$args[0] = $this->upperBound;
		$upperBound = call_user_func_array( $transformation, $args );

		$args[0] = $this->lowerBound;
		$lowerBound = call_user_func_array( $transformation, $args );

		// use a preliminary QuantityValue to determine the significant number of digits
		$transformed = new self( $amount, $newUnit, $upperBound, $lowerBound );
		$roundingExponent = $transformed->getOrderOfUncertainty();

		// apply rounding to the significant digits
		$math = new DecimalMath();

		$amount = $math->roundToExponent( $amount, $roundingExponent );
		$upperBound = $math->roundToExponent( $upperBound, $roundingExponent );
		$lowerBound = $math->roundToExponent( $lowerBound, $roundingExponent );

		return new self( $amount, $newUnit, $upperBound, $lowerBound );
	}

	public function __toString() {
		return $this->amount->getValue()
			. '[' . $this->lowerBound->getValue()
			. '..' . $this->upperBound->getValue()
			. ']'
			. ( $this->unit === '1' ? '' : $this->unit );
	}

	/**
	 * @see DataValue::getArrayValue
	 *
	 * @since 0.1
	 *
	 * @return array
	 */
	public function getArrayValue() {
		return array(
			'amount' => $this->amount->getArrayValue(),
			'unit' => $this->unit,
			'upperBound' => $this->upperBound->getArrayValue(),
			'lowerBound' => $this->lowerBound->getArrayValue(),
		);
	}

	/**
	 * Constructs a new instance of the DataValue from the provided data.
	 * This can round-trip with @see getArrayValue
	 *
	 * @note: if the upperBound or lowerBound field is missing from $data,
	 * this returns an UnboundedQuantityValue, not a QuantityValue!
	 *
	 * @since 0.1
	 *
	 * @param mixed $data
	 *
	 * @return UnboundedQuantityValue
	 * @throws IllegalValueException
	 */
	public static function newFromArray( $data ) {
		if ( !isset( $data['upperBound'] ) || !isset( $data['lowerBound'] ) ) {
			// No bounds given, so construct an unbounded QuantityValue.
			return parent::newFromArray( $data );
		}

		self::requireArrayFields( $data, array( 'amount', 'unit', 'upperBound', 'lowerBound' ) );

		return new static(
			DecimalValue::newFromArray( $data['amount'] ),
			$data['unit'],
			DecimalValue::newFromArray( $data['upperBound'] ),
			DecimalValue::newFromArray( $data['lowerBound'] )
		);
	}

}


1			<?php
2
3			namespace DataValues;
4
5			use InvalidArgumentException;
6
7			/**
8			* Class representing a quantity with associated unit and uncertainty interval.
9			* The amount is stored as a @see DecimalValue object.
10			*
11			* @see UnboundedQuantityValue For quantities with no known uncertainty interval.
12			* For simple numeric amounts use @see NumberValue.
13			*
14			* @note UnboundedQuantityValue and QuantityValue both use the value type ID "quantity".
15			* The fact that we use subclassing to model the bounded vs the unbounded case should be
16			* considered an implementation detail.
17			*
18			* @since 0.1
19			*
20			* @license GPL-2.0+
21			* @author Daniel Kinzler
22			*/
23			class QuantityValue extends UnboundedQuantityValue {
24
25			/**
26			* The quantity's upper bound
27			*
28			* @var DecimalValue
29			*/
30			private $upperBound;
31
32			/**
33			* The quantity's lower bound
34			*
35			* @var DecimalValue
36			*/
37			private $lowerBound;
38
39			/**
40			* @param DecimalValue $amount
41			* @param string $unit A unit identifier. Must not be empty, use "1" for unit-less quantities.
42			* @param DecimalValue $upperBound The upper bound of the quantity, inclusive.
43			* @param DecimalValue $lowerBound The lower bound of the quantity, inclusive.
44			*
45			* @throws IllegalValueException
46			*/
47			public function __construct( DecimalValue $amount, $unit, DecimalValue $upperBound, DecimalValue $lowerBound ) {
48			parent::__construct( $amount, $unit );
49
50			if ( $lowerBound->compare( $amount ) > 0 ) {
			0 ignored issues – show Documentation introduced 2016-02-23 14:41 UTC by Report Bug Copy Issue Report `$amount` is of type `object<DataValues\DecimalValue>`, but the function expects a `object<self>`. It seems like the type of the argument is not accepted by the function/method which you are calling. In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug. We suggest to add an explicit type cast like in the following example: function acceptsInteger($int) { } $x = '123'; // string "123" // Instead of acceptsInteger($x); // we recommend to use acceptsInteger((integer) $x); Loading history...
51			throw new IllegalValueException( '$lowerBound ' . $lowerBound->getValue() . ' must be <= $amount ' . $amount->getValue() );
52			}
53
54			if ( $upperBound->compare( $amount ) < 0 ) {
			0 ignored issues – show Documentation introduced 2016-02-23 14:41 UTC by Report Bug Copy Issue Report `$amount` is of type `object<DataValues\DecimalValue>`, but the function expects a `object<self>`. It seems like the type of the argument is not accepted by the function/method which you are calling. In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug. We suggest to add an explicit type cast like in the following example: function acceptsInteger($int) { } $x = '123'; // string "123" // Instead of acceptsInteger($x); // we recommend to use acceptsInteger((integer) $x); Loading history...
55			throw new IllegalValueException( '$upperBound ' . $upperBound->getValue() . ' must be >= $amount ' . $amount->getValue() );
56			}
57
58			$this->upperBound = $upperBound;
59			$this->lowerBound = $lowerBound;
60			}
61
62			/**
63			* Returns a QuantityValue representing the given amount.
64			* If no upper or lower bound is given, the amount is assumed to be absolutely exact,
65			* that is, the amount itself will be used as the upper and lower bound.
66			*
67			* This is a convenience wrapper around the constructor that accepts native values
68			* instead of DecimalValue objects.
69			*
70			* @note: if the amount or a bound is given as a string, the string must conform
71			* to the rules defined by @see DecimalValue.
72			*
73			* @since 0.1
74			*
75			* @param string\|int\|float\|DecimalValue $amount
76			* @param string $unit A unit identifier. Must not be empty, use "1" for unit-less quantities.
77			* @param string\|int\|float\|DecimalValue\|null $upperBound
78			* @param string\|int\|float\|DecimalValue\|null $lowerBound
79			*
80			* @return self
81			* @throws IllegalValueException
82			*/
83			public static function newFromNumber( $amount, $unit = '1', $upperBound = null, $lowerBound = null ) {
84			$amount = self::asDecimalValue( 'amount', $amount );
85			$upperBound = self::asDecimalValue( 'upperBound', $upperBound, $amount );
86			$lowerBound = self::asDecimalValue( 'lowerBound', $lowerBound, $amount );
87
88			return new self( $amount, $unit, $upperBound, $lowerBound );
89			}
90
91			/**
92			* @see newFromNumber
93			*
94			* @deprecated since 0.1, use newFromNumber instead
95			*
96			* @param string\|int\|float\|DecimalValue $amount
97			* @param string $unit
98			* @param string\|int\|float\|DecimalValue\|null $upperBound
99			* @param string\|int\|float\|DecimalValue\|null $lowerBound
100			*
101			* @return self
102			*/
103			public static function newFromDecimal( $amount, $unit = '1', $upperBound = null, $lowerBound = null ) {
104			return self::newFromNumber( $amount, $unit, $upperBound, $lowerBound );
105			}
106
107			/**
108			* @see Serializable::serialize
109			*
110			* @since 0.1
111			*
112			* @return string
113			*/
114			public function serialize() {
115			return serialize( array(
116			$this->amount,
117			$this->unit,
118			$this->upperBound,
119			$this->lowerBound,
120			) );
121			}
122
123			/**
124			* @see Serializable::unserialize
125			*
126			* @since 0.1
127			*
128			* @param string $data
129			*/
130			public function unserialize( $data ) {
131			list( $amount, $unit, $upperBound, $lowerBound ) = unserialize( $data );
132			$this->__construct( $amount, $unit, $upperBound, $lowerBound );
133			}
134
135			/**
136			* Returns this quantity's upper bound.
137			*
138			* @since 0.1
139			*
140			* @return DecimalValue
141			*/
142			public function getUpperBound() {
143			return $this->upperBound;
144			}
145
146			/**
147			* Returns this quantity's lower bound.
148			*
149			* @since 0.1
150			*
151			* @return DecimalValue
152			*/
153			public function getLowerBound() {
154			return $this->lowerBound;
155			}
156
157			/**
158			* Returns the size of the uncertainty interval.
159			* This can roughly be interpreted as "amount +/- uncertainty/2".
160			*
161			* The exact interpretation of the uncertainty interval is left to the concrete application or
162			* data point. For example, the uncertainty interval may be defined to be that part of a
163			* normal distribution that is required to cover the 95th percentile.
164			*
165			* @since 0.1
166			*
167			* @return float
168			*/
169			public function getUncertainty() {
170			return $this->upperBound->getValueFloat() - $this->lowerBound->getValueFloat();
171			}
172
173			/**
174			* Returns a DecimalValue representing the symmetrical offset to be applied
175			* to the raw amount for a rough representation of the uncertainty interval,
176			* as in "amount +/- offset".
177			*
178			* The offset is calculated as max( amount - lowerBound, upperBound - amount ).
179			*
180			* @todo Should be factored out into a separate QuantityMath class.
181			*
182			* @since 0.1
183			*
184			* @return DecimalValue
185			*/
186			public function getUncertaintyMargin() {
187			$math = new DecimalMath();
188
189			$lowerMargin = $math->sum( $this->amount, $this->lowerBound->computeComplement() );
190			$upperMargin = $math->sum( $this->upperBound, $this->amount->computeComplement() );
191
192			$margin = $math->max( $lowerMargin, $upperMargin );
193			return $margin;
194			}
195
196			/**
197			* Returns the order of magnitude of the uncertainty as the exponent of
198			* last significant digit in the amount-string. The value returned by this
199			* is suitable for use with @see DecimalMath::roundToExponent().
200			*
201			* @example: if two digits after the decimal point are significant, this
202			* returns -2.
203			*
204			* @example: if the last two digits before the decimal point are insignificant,
205			* this returns 2.
206			*
207			* Note that this calculation assumes a symmetric uncertainty interval,
208			* and can be misleading.
209			*
210			* @todo Should be factored out into a separate QuantityMath class.
211			*
212			* @since 0.1
213			*
214			* @return int
215			*/
216			public function getOrderOfUncertainty() {
217			// the desired precision is given by the distance between the amount and
218			// whatever is closer, the upper or lower bound.
219			//TODO: use DecimalMath to avoid floating point errors!
220			$amount = $this->amount->getValueFloat();
221			$upperBound = $this->upperBound->getValueFloat();
222			$lowerBound = $this->lowerBound->getValueFloat();
223			$precision = min( $amount - $lowerBound, $upperBound - $amount );
224
225			if ( $precision === 0.0 ) {
226			// If there is no uncertainty, the order of uncertainty is a bit more than what we have digits for.
227			return -strlen( $this->amount->getFractionalPart() );
228			}
229
230			// e.g. +/- 200 -> 2; +/- 0.02 -> -2
231			// note: we really want floor( log10( $precision ) ), but have to account for
232			// small errors made in the floating point operations above.
233			// @todo: use bcmath (via DecimalMath) to avoid this if possible
234			$orderOfUncertainty = floor( log10( $precision + 0.0000000005 ) );
235
236			return (int)$orderOfUncertainty;
237			}
238
239			/**
240			* Returns a transformed value derived from this QuantityValue by applying
241			* the given transformation to the amount and the upper and lower bounds.
242			* The resulting amount and bounds are rounded to the significant number of
243			* digits. Note that for exact quantities (with at least one bound equal to
244			* the amount), no rounding is applied (since they are considered to have
245			* infinite precision).
246			*
247			* The transformation is provided as a callback, which must implement a
248			* monotonously increasing, fully differentiable function mapping a DecimalValue
249			* to a DecimalValue. Typically, it will be a linear transformation applying a
250			* factor and an offset.
251			*
252			* @param string $newUnit The unit of the transformed quantity.
253			*
254			* @param callable $transformation A callback that implements the desired transformation.
255			* The transformation will be called three times, once for the amount, once
256			* for the lower bound, and once for the upper bound. It must return a DecimalValue.
257			* The first parameter passed to $transformation is the DecimalValue to transform
258			* In addition, any extra parameters passed to transform() will be passed through
259			* to the transformation callback.
260			*
261			* @param mixed ... Any extra parameters will be passed to the $transformation function.
262			*
263			* @todo share more code with UnboundQuantityValue::transform.
264			* @todo Should be factored out into a separate QuantityMath class.
265			*
266			* @throws InvalidArgumentException
267			* @return self
268			*/
269			public function transform( $newUnit, $transformation ) {
270			if ( !is_callable( $transformation ) ) {
271			throw new InvalidArgumentException( '$transformation must be callable.' );
272			}
273
274			if ( !is_string( $newUnit ) ) {
275			throw new InvalidArgumentException( '$newUnit must be a string. Use "1" as the unit for unit-less quantities.' );
276			}
277
278			if ( $newUnit === '' ) {
279			throw new InvalidArgumentException( '$newUnit must not be empty. Use "1" as the unit for unit-less quantities.' );
280			}
281
282			$oldUnit = $this->unit;
283
284			if ( $newUnit === null ) {
285			$newUnit = $oldUnit;
286			}
287
288			// Apply transformation by calling the $transform callback.
289			// The first argument for the callback is the DataValue to transform. In addition,
290			// any extra arguments given for transform() are passed through.
291			$args = func_get_args();
292			array_shift( $args );
293
294			$args[0] = $this->amount;
295			$amount = call_user_func_array( $transformation, $args );
296
297			$args[0] = $this->upperBound;
298			$upperBound = call_user_func_array( $transformation, $args );
299
300			$args[0] = $this->lowerBound;
301			$lowerBound = call_user_func_array( $transformation, $args );
302
303			// use a preliminary QuantityValue to determine the significant number of digits
304			$transformed = new self( $amount, $newUnit, $upperBound, $lowerBound );
305			$roundingExponent = $transformed->getOrderOfUncertainty();
306
307			// apply rounding to the significant digits
308			$math = new DecimalMath();
309
310			$amount = $math->roundToExponent( $amount, $roundingExponent );
311			$upperBound = $math->roundToExponent( $upperBound, $roundingExponent );
312			$lowerBound = $math->roundToExponent( $lowerBound, $roundingExponent );
313
314			return new self( $amount, $newUnit, $upperBound, $lowerBound );
315			}
316
317			public function __toString() {
318			return $this->amount->getValue()
319			. '[' . $this->lowerBound->getValue()
320			. '..' . $this->upperBound->getValue()
321			. ']'
322			. ( $this->unit === '1' ? '' : $this->unit );
323			}
324
325			/**
326			* @see DataValue::getArrayValue
327			*
328			* @since 0.1
329			*
330			* @return array
331			*/
332			public function getArrayValue() {
333			return array(
334			'amount' => $this->amount->getArrayValue(),
335			'unit' => $this->unit,
336			'upperBound' => $this->upperBound->getArrayValue(),
337			'lowerBound' => $this->lowerBound->getArrayValue(),
338			);
339			}
340
341			/**
342			* Constructs a new instance of the DataValue from the provided data.
343			* This can round-trip with @see getArrayValue
344			*
345			* @note: if the upperBound or lowerBound field is missing from $data,
346			* this returns an UnboundedQuantityValue, not a QuantityValue!
347			*
348			* @since 0.1
349			*
350			* @param mixed $data
351			*
352			* @return UnboundedQuantityValue
353			* @throws IllegalValueException
354			*/
355			public static function newFromArray( $data ) {
356			if ( !isset( $data['upperBound'] ) \|\| !isset( $data['lowerBound'] ) ) {
357			// No bounds given, so construct an unbounded QuantityValue.
358			return parent::newFromArray( $data );
359			}
360
361			self::requireArrayFields( $data, array( 'amount', 'unit', 'upperBound', 'lowerBound' ) );
362
363			return new static(
364			DecimalValue::newFromArray( $data['amount'] ),
365			$data['unit'],
366			DecimalValue::newFromArray( $data['upperBound'] ),
367			DecimalValue::newFromArray( $data['lowerBound'] )
368			);
369			}
370
371			}
372

DataValues / Number

Pull Request — master (#66)

QuantityValue::getLowerBound() A

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