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libraries/joomla/data/data.php
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332
libraries/joomla/data/data.php
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<?php
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/**
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* @package Joomla.Platform
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* @subpackage Data
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*
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* @copyright Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
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* @license GNU General Public License version 2 or later; see LICENSE
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*/
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defined('JPATH_PLATFORM') or die;
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/**
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* JData is a class that is used to store data but allowing you to access the data
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* by mimicking the way PHP handles class properties.
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*
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* @package Joomla.Platform
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* @subpackage Data
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* @since 12.3
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*/
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class JData implements JDataDumpable, IteratorAggregate, JsonSerializable, Countable
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{
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/**
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* The data properties.
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*
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* @var array
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* @since 12.3
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*/
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private $_properties = array();
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/**
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* The class constructor.
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*
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* @param mixed $properties Either an associative array or another object
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* by which to set the initial properties of the new object.
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*
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* @since 12.3
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* @throws InvalidArgumentException
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*/
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public function __construct($properties = array())
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{
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// Check the properties input.
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if (!empty($properties))
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{
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// Bind the properties.
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$this->bind($properties);
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}
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}
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/**
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* The magic get method is used to get a data property.
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*
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* This method is a public proxy for the protected getProperty method.
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*
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* Note: Magic __get does not allow recursive calls. This can be tricky because the error generated by recursing into
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* __get is "Undefined property: {CLASS}::{PROPERTY}" which is misleading. This is relevant for this class because
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* requesting a non-visible property can trigger a call to a sub-function. If that references the property directly in
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* the object, it will cause a recursion into __get.
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*
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* @param string $property The name of the data property.
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*
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* @return mixed The value of the data property, or null if the data property does not exist.
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*
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* @see JData::getProperty()
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* @since 12.3
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*/
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public function __get($property)
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{
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return $this->getProperty($property);
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}
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/**
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* The magic isset method is used to check the state of an object property.
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*
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* @param string $property The name of the data property.
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*
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* @return boolean True if set, otherwise false is returned.
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*
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* @since 12.3
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*/
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public function __isset($property)
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{
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return isset($this->_properties[$property]);
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}
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/**
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* The magic set method is used to set a data property.
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*
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* This is a public proxy for the protected setProperty method.
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*
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* @param string $property The name of the data property.
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* @param mixed $value The value to give the data property.
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*
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* @return void
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*
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* @see JData::setProperty()
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* @since 12.3
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*/
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public function __set($property, $value)
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{
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$this->setProperty($property, $value);
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}
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/**
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* The magic unset method is used to unset a data property.
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*
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* @param string $property The name of the data property.
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*
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* @return void
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*
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* @since 12.3
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*/
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public function __unset($property)
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{
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unset($this->_properties[$property]);
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}
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/**
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* Binds an array or object to this object.
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*
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* @param mixed $properties An associative array of properties or an object.
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* @param boolean $updateNulls True to bind null values, false to ignore null values.
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*
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* @return JData Returns itself to allow chaining.
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*
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* @since 12.3
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* @throws InvalidArgumentException
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*/
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public function bind($properties, $updateNulls = true)
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{
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// Check the properties data type.
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if (!is_array($properties) && !is_object($properties))
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{
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throw new InvalidArgumentException(sprintf('%s(%s)', __METHOD__, gettype($properties)));
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}
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// Check if the object is traversable.
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if ($properties instanceof Traversable)
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{
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// Convert iterator to array.
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$properties = iterator_to_array($properties);
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}
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// Check if the object needs to be converted to an array.
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elseif (is_object($properties))
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{
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// Convert properties to an array.
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$properties = (array) $properties;
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}
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// Bind the properties.
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foreach ($properties as $property => $value)
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{
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// Check if the value is null and should be bound.
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if ($value === null && !$updateNulls)
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{
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continue;
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}
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// Set the property.
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$this->setProperty($property, $value);
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}
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return $this;
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}
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/**
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* Dumps the data properties into a stdClass object, recursively if appropriate.
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*
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* @param integer $depth The maximum depth of recursion (default = 3).
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* For example, a depth of 0 will return a stdClass with all the properties in native
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* form. A depth of 1 will recurse into the first level of properties only.
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* @param SplObjectStorage $dumped An array of already serialized objects that is used to avoid infinite loops.
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*
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* @return stdClass The data properties as a simple PHP stdClass object.
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*
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* @since 12.3
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*/
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public function dump($depth = 3, SplObjectStorage $dumped = null)
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{
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// Check if we should initialise the recursion tracker.
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if ($dumped === null)
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{
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$dumped = new SplObjectStorage;
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}
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// Add this object to the dumped stack.
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$dumped->attach($this);
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// Setup a container.
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$dump = new stdClass;
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// Dump all object properties.
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foreach (array_keys($this->_properties) as $property)
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{
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// Get the property.
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$dump->$property = $this->dumpProperty($property, $depth, $dumped);
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}
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return $dump;
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}
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/**
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* Gets this object represented as an ArrayIterator.
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*
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* This allows the data properties to be access via a foreach statement.
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*
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* @return ArrayIterator This object represented as an ArrayIterator.
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*
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* @see IteratorAggregate::getIterator()
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* @since 12.3
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*/
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public function getIterator()
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{
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return new ArrayIterator($this->dump(0));
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}
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/**
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* Gets the data properties in a form that can be serialised to JSON format.
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*
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* @return string An object that can be serialised by json_encode().
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*
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* @since 12.3
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*/
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public function jsonSerialize()
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{
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return $this->dump();
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}
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/**
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* Dumps a data property.
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*
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* If recursion is set, this method will dump any object implementing JDumpable (like JData and JDataSet); it will
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* convert a JDate object to a string; and it will convert a JRegistry to an object.
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*
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* @param string $property The name of the data property.
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* @param integer $depth The current depth of recursion (a value of 0 will ignore recursion).
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* @param SplObjectStorage $dumped An array of already serialized objects that is used to avoid infinite loops.
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*
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* @return mixed The value of the dumped property.
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*
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* @since 12.3
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*/
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protected function dumpProperty($property, $depth, SplObjectStorage $dumped)
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{
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$value = $this->getProperty($property);
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if ($depth > 0)
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{
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// Check if the object is also an dumpable object.
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if ($value instanceof JDataDumpable)
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{
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// Do not dump the property if it has already been dumped.
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if (!$dumped->contains($value))
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{
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$value = $value->dump($depth - 1, $dumped);
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}
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}
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// Check if the object is a date.
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if ($value instanceof JDate)
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{
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$value = (string) $value;
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}
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// Check if the object is a registry.
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elseif ($value instanceof JRegistry)
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{
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$value = $value->toObject();
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}
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}
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return $value;
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}
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/**
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* Gets a data property.
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*
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* @param string $property The name of the data property.
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*
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* @return mixed The value of the data property.
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*
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* @see JData::__get()
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* @since 12.3
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*/
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protected function getProperty($property)
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{
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// Get the raw value.
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$value = array_key_exists($property, $this->_properties) ? $this->_properties[$property] : null;
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return $value;
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}
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/**
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* Sets a data property.
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*
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* If the name of the property starts with a null byte, this method will return null.
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*
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* @param string $property The name of the data property.
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* @param mixed $value The value to give the data property.
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*
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* @return mixed The value of the data property.
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*
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* @see JData::__set()
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* @since 12.3
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*/
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protected function setProperty($property, $value)
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{
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/*
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* Check if the property starts with a null byte. If so, discard it because a later attempt to try to access it
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* can cause a fatal error. See http://us3.php.net/manual/en/language.types.array.php#language.types.array.casting
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*/
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if (strpos($property, "\0") === 0)
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{
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return null;
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}
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// Set the value.
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$this->_properties[$property] = $value;
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return $value;
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}
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/**
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* Count the number of data properties.
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*
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* @return integer The number of data properties.
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*
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* @since 12.3
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*/
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public function count()
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{
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return count($this->_properties);
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}
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}
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