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<?php
/**
* This file contains classes implementing attribute collection feature.
*
* @author Qiang Xue <[email protected]>
* @link http://www.yiiframework.com/
* @copyright Copyright © 2008-2011 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* CAttributeCollection implements a collection for storing attribute names and values.
*
* Besides all functionalities provided by {@link CMap}, CAttributeCollection
* allows you to get and set attribute values like getting and setting
* properties. For example, the following usages are all valid for a
* CAttributeCollection object:
* <pre>
* $collection->text='text'; // same as: $collection->add('text','text');
* echo $collection->text; // same as: echo $collection->itemAt('text');
* </pre>
*
* The case sensitivity of attribute names can be toggled by setting the
* {@link caseSensitive} property of the collection.
*
* @author Qiang Xue <[email protected]>
* @package system.collections
* @since 1.0
*/
class CAttributeCollection extends CMap
{
/**
* @var boolean whether the keys are case-sensitive. Defaults to false.
*/
public $caseSensitive=false;
/**
* Returns a property value or an event handler list by property or event name.
* This method overrides the parent implementation by returning
* a key value if the key exists in the collection.
* @param string $name the property name or the event name
* @return mixed the property value or the event handler list
* @throws CException if the property/event is not defined.
*/
public function __get($name)
{
if($this->contains($name))
return $this->itemAt($name);
else
return parent::__get($name);
}
/**
* Sets value of a component property.
* This method overrides the parent implementation by adding a new key value
* to the collection.
* @param string $name the property name or event name
* @param mixed $value the property value or event handler
* @throws CException If the property is not defined or read-only.
*/
public function __set($name,$value)
{
$this->add($name,$value);
}
/**
* Checks if a property value is null.
* This method overrides the parent implementation by checking
* if the key exists in the collection and contains a non-null value.
* @param string $name the property name or the event name
* @return boolean whether the property value is null
*/
public function __isset($name)
{
if($this->contains($name))
return $this->itemAt($name)!==null;
else
return parent::__isset($name);
}
/**
* Sets a component property to be null.
* This method overrides the parent implementation by clearing
* the specified key value.
* @param string $name the property name or the event name
*/
public function __unset($name)
{
$this->remove($name);
}
/**
* Returns the item with the specified key.
* This overrides the parent implementation by converting the key to lower case first if {@link caseSensitive} is false.
* @param mixed $key the key
* @return mixed the element at the offset, null if no element is found at the offset
*/
public function itemAt($key)
{
if($this->caseSensitive)
return parent::itemAt($key);
else
return parent::itemAt(strtolower($key));
}
/**
* Adds an item into the map.
* This overrides the parent implementation by converting the key to lower case first if {@link caseSensitive} is false.
* @param mixed $key key
* @param mixed $value value
*/
public function add($key,$value)
{
if($this->caseSensitive)
parent::add($key,$value);
else
parent::add(strtolower($key),$value);
}
/**
* Removes an item from the map by its key.
* This overrides the parent implementation by converting the key to lower case first if {@link caseSensitive} is false.
* @param mixed $key the key of the item to be removed
* @return mixed the removed value, null if no such key exists.
*/
public function remove($key)
{
if($this->caseSensitive)
return parent::remove($key);
else
return parent::remove(strtolower($key));
}
/**
* Returns whether the specified is in the map.
* This overrides the parent implementation by converting the key to lower case first if {@link caseSensitive} is false.
* @param mixed $key the key
* @return boolean whether the map contains an item with the specified key
*/
public function contains($key)
{
if($this->caseSensitive)
return parent::contains($key);
else
return parent::contains(strtolower($key));
}
/**
* Determines whether a property is defined.
* This method overrides parent implementation by returning true
* if the collection contains the named key.
* @param string $name the property name
* @return boolean whether the property is defined
*/
public function hasProperty($name)
{
return $this->contains($name) || parent::hasProperty($name);
}
/**
* Determines whether a property can be read.
* This method overrides parent implementation by returning true
* if the collection contains the named key.
* @param string $name the property name
* @return boolean whether the property can be read
*/
public function canGetProperty($name)
{
return $this->contains($name) || parent::canGetProperty($name);
}
/**
* Determines whether a property can be set.
* This method overrides parent implementation by always returning true
* because you can always add a new value to the collection.
* @param string $name the property name
* @return boolean true
*/
public function canSetProperty($name)
{
return true;
}
/**
* Merges iterable data into the map.
*
* Existing elements in the map will be overwritten if their keys are the same as those in the source.
* If the merge is recursive, the following algorithm is performed:
* <ul>
* <li>the map data is saved as $a, and the source data is saved as $b;</li>
* <li>if $a and $b both have an array indexed at the same string key, the arrays will be merged using this algorithm;</li>
* <li>any integer-indexed elements in $b will be appended to $a and reindexed accordingly;</li>
* <li>any string-indexed elements in $b will overwrite elements in $a with the same index;</li>
* </ul>
*
* @param mixed $data the data to be merged with, must be an array or object implementing Traversable
* @param boolean $recursive whether the merging should be recursive.
*
* @throws CException If data is neither an array nor an iterator.
*/
public function mergeWith($data,$recursive=true)
{
if(!$this->caseSensitive && (is_array($data) || $data instanceof Traversable))
{
$d=array();
foreach($data as $key=>$value)
$d[strtolower($key)]=$value;
return parent::mergeWith($d,$recursive);
}
parent::mergeWith($data,$recursive);
}
}