123 lines
3.4 KiB
PHP
123 lines
3.4 KiB
PHP
<?php
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/*
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* (c) Markus Lanthaler <mail@markus-lanthaler.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace ML\JsonLD;
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use stdClass as JsonObject;
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/**
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* Value is the abstract base class used for typed values and
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* language-tagged strings.
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*
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* @author Markus Lanthaler <mail@markus-lanthaler.com>
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*/
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abstract class Value implements JsonLdSerializable
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{
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/**
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* The value in the form of a string
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*
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* @var string
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*/
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protected $value;
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/**
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* Set the value
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*
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* @param string $value The value.
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*
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* @return self
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*
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* @throws \InvalidArgumentException If the value is not a string.
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*/
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public function setValue($value)
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{
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if (!is_string($value)) {
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throw new \InvalidArgumentException('value must be a string.');
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}
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$this->value = $value;
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return $this;
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}
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/**
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* Get the value
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*
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* @return string The value.
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*/
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public function getValue()
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{
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return $this->value;
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}
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/**
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* Create a LanguageTaggedString or TypedValue from a JSON-LD element
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*
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* If the passed value element can't be transformed to a language-tagged
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* string or a typed value false is returned.
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*
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* @param JsonObject $element The JSON-LD element
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*
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* @return false|LanguageTaggedString|TypedValue The parsed object
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*/
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public static function fromJsonLd(JsonObject $element)
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{
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if (false === property_exists($element, '@value')) {
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return false;
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}
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$value = $element->{'@value'};
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$type = (property_exists($element, '@type'))
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? $element->{'@type'}
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: null;
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$language = (property_exists($element, '@language'))
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? $element->{'@language'}
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: null;
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if (is_int($value) || is_float($value)) {
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if (($value != (int) $value) || (RdfConstants::XSD_DOUBLE === $type)) {
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$value = preg_replace('/(0{0,14})E(\+?)/', 'E', sprintf('%1.15E', $value));
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if ((null === $type) && (null === $language)) {
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return new TypedValue($value, RdfConstants::XSD_DOUBLE);
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}
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} else {
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$value = sprintf('%d', $value);
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if ((null === $type) && (null === $language)) {
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return new TypedValue($value, RdfConstants::XSD_INTEGER);
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}
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}
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} elseif (is_bool($value)) {
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$value = ($value) ? 'true' : 'false';
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if ((null === $type) && (null === $language)) {
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return new TypedValue($value, RdfConstants::XSD_BOOLEAN);
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}
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} elseif (false === is_string($value)) {
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return false;
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}
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// @type gets precedence
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if ((null === $type) && (null !== $language)) {
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return new LanguageTaggedString($value, $language);
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}
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return new TypedValue($value, (null === $type) ? RdfConstants::XSD_STRING : $type);
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}
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/**
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* Compares this instance to the specified value.
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*
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* @param mixed $other The value this instance should be compared to.
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*
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* @return bool Returns true if the passed value is the same as this
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* instance; false otherwise.
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*/
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abstract public function equals($other);
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}
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