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459 lines
17 KiB
459 lines
17 KiB
13 years ago
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<?php
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/**
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* CSort class file.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @link http://www.yiiframework.com/
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* @copyright Copyright © 2008-2011 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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/**
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* CSort represents information relevant to sorting.
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*
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* When data needs to be sorted according to one or several attributes,
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* we can use CSort to represent the sorting information and generate
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* appropriate hyperlinks that can lead to sort actions.
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*
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* CSort is designed to be used together with {@link CActiveRecord}.
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* When creating a CSort instance, you need to specify {@link modelClass}.
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* You can use CSort to generate hyperlinks by calling {@link link}.
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* You can also use CSort to modify a {@link CDbCriteria} instance by calling {@link applyOrder} so that
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* it can cause the query results to be sorted according to the specified
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* attributes.
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*
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* In order to prevent SQL injection attacks, CSort ensures that only valid model attributes
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* can be sorted. This is determined based on {@link modelClass} and {@link attributes}.
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* When {@link attributes} is not set, all attributes belonging to {@link modelClass}
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* can be sorted. When {@link attributes} is set, only those attributes declared in the property
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* can be sorted.
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*
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* By configuring {@link attributes}, one can perform more complex sorts that may
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* consist of things like compound attributes (e.g. sort based on the combination of
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* first name and last name of users).
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*
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* The property {@link attributes} should be an array of key-value pairs, where the keys
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* represent the attribute names, while the values represent the virtual attribute definitions.
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* For more details, please check the documentation about {@link attributes}.
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*
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* @property string $orderBy The order-by columns represented by this sort object.
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* This can be put in the ORDER BY clause of a SQL statement.
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* @property array $directions Sort directions indexed by attribute names.
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* The sort direction. Can be either CSort::SORT_ASC for ascending order or
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* CSort::SORT_DESC for descending order.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @version $Id$
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* @package system.web
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*/
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class CSort extends CComponent
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{
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/**
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* Sort ascending
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* @since 1.1.10
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*/
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const SORT_ASC = false;
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/**
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* Sort descending
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* @since 1.1.10
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*/
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const SORT_DESC = true;
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/**
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* @var boolean whether the sorting can be applied to multiple attributes simultaneously.
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* Defaults to false, which means each time the data can only be sorted by one attribute.
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*/
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public $multiSort=false;
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/**
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* @var string the name of the model class whose attributes can be sorted.
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* The model class must be a child class of {@link CActiveRecord}.
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*/
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public $modelClass;
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/**
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* @var array list of attributes that are allowed to be sorted.
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* For example, array('user_id','create_time') would specify that only 'user_id'
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* and 'create_time' of the model {@link modelClass} can be sorted.
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* By default, this property is an empty array, which means all attributes in
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* {@link modelClass} are allowed to be sorted.
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*
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* This property can also be used to specify complex sorting. To do so,
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* a virtual attribute can be declared in terms of a key-value pair in the array.
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* The key refers to the name of the virtual attribute that may appear in the sort request,
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* while the value specifies the definition of the virtual attribute.
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*
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* In the simple case, a key-value pair can be like <code>'user'=>'user_id'</code>
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* where 'user' is the name of the virtual attribute while 'user_id' means the virtual
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* attribute is the 'user_id' attribute in the {@link modelClass}.
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*
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* A more flexible way is to specify the key-value pair as
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* <pre>
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* 'user'=>array(
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* 'asc'=>'first_name, last_name',
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* 'desc'=>'first_name DESC, last_name DESC',
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* 'label'=>'Name'
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* )
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* </pre>
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* where 'user' is the name of the virtual attribute that specifies the full name of user
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* (a compound attribute consisting of first name and last name of user). In this case,
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* we have to use an array to define the virtual attribute with three elements: 'asc',
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* 'desc' and 'label'.
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*
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* The above approach can also be used to declare virtual attributes that consist of relational
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* attributes. For example,
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* <pre>
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* 'price'=>array(
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* 'asc'=>'item.price',
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* 'desc'=>'item.price DESC',
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* 'label'=>'Item Price'
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* )
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* </pre>
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*
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* Note, the attribute name should not contain '-' or '.' characters because
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* they are used as {@link separators}.
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*
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* Starting from version 1.1.3, an additional option named 'default' can be used in the virtual attribute
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* declaration. This option specifies whether an attribute should be sorted in ascending or descending
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* order upon user clicking the corresponding sort hyperlink if it is not currently sorted. The valid
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* option values include 'asc' (default) and 'desc'. For example,
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* <pre>
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* 'price'=>array(
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* 'asc'=>'item.price',
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* 'desc'=>'item.price DESC',
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* 'label'=>'Item Price',
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* 'default'=>'desc',
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* )
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* </pre>
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*
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* Also starting from version 1.1.3, you can include a star ('*') element in this property so that
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* all model attributes are available for sorting, in addition to those virtual attributes. For example,
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* <pre>
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* 'attributes'=>array(
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* 'price'=>array(
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* 'asc'=>'item.price',
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* 'desc'=>'item.price DESC',
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* 'label'=>'Item Price',
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* 'default'=>'desc',
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* ),
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* '*',
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* )
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* </pre>
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* Note that when a name appears as both a model attribute and a virtual attribute, the position of
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* the star element in the array determines which one takes precedence. In particular, if the star
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* element is the first element in the array, the model attribute takes precedence; and if the star
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* element is the last one, the virtual attribute takes precedence.
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*/
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public $attributes=array();
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/**
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* @var string the name of the GET parameter that specifies which attributes to be sorted
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* in which direction. Defaults to 'sort'.
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*/
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public $sortVar='sort';
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/**
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* @var string the tag appeared in the GET parameter that indicates the attribute should be sorted
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* in descending order. Defaults to 'desc'.
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*/
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public $descTag='desc';
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/**
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* @var mixed the default order that should be applied to the query criteria when
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* the current request does not specify any sort. For example, 'name, create_time DESC' or
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* 'UPPER(name)'.
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*
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* Starting from version 1.1.3, you can also specify the default order using an array.
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* The array keys could be attribute names or virtual attribute names as declared in {@link attributes},
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* and the array values indicate whether the sorting of the corresponding attributes should
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* be in descending order. For example,
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* <pre>
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* 'defaultOrder'=>array(
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* 'price'=>CSort::SORT_DESC,
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* )
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* </pre>
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* `SORT_DESC` and `SORT_ASC` are available since 1.1.10. In earlier Yii versions you should use
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* `true` and `false` respectively.
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*
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* Please note when using array to specify the default order, the corresponding attributes
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* will be put into {@link directions} and thus affect how the sort links are rendered
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* (e.g. an arrow may be displayed next to the currently active sort link).
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*/
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public $defaultOrder;
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/**
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* @var string the route (controller ID and action ID) for generating the sorted contents.
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* Defaults to empty string, meaning using the currently requested route.
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*/
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public $route='';
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/**
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* @var array separators used in the generated URL. This must be an array consisting of
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* two elements. The first element specifies the character separating different
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* attributes, while the second element specifies the character separating attribute name
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* and the corresponding sort direction. Defaults to array('-','.').
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*/
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public $separators=array('-','.');
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/**
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* @var array the additional GET parameters (name=>value) that should be used when generating sort URLs.
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* Defaults to null, meaning using the currently available GET parameters.
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*/
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public $params;
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private $_directions;
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/**
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* Constructor.
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* @param string $modelClass the class name of data models that need to be sorted.
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* This should be a child class of {@link CActiveRecord}.
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*/
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public function __construct($modelClass=null)
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{
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$this->modelClass=$modelClass;
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}
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/**
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* Modifies the query criteria by changing its {@link CDbCriteria::order} property.
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* This method will use {@link directions} to determine which columns need to be sorted.
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* They will be put in the ORDER BY clause. If the criteria already has non-empty {@link CDbCriteria::order} value,
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* the new value will be appended to it.
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* @param CDbCriteria $criteria the query criteria
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*/
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public function applyOrder($criteria)
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{
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$order=$this->getOrderBy();
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if(!empty($order))
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{
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if(!empty($criteria->order))
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$criteria->order.=', ';
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$criteria->order.=$order;
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}
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}
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/**
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* @return string the order-by columns represented by this sort object.
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* This can be put in the ORDER BY clause of a SQL statement.
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* @since 1.1.0
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*/
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public function getOrderBy()
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{
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$directions=$this->getDirections();
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if(empty($directions))
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return is_string($this->defaultOrder) ? $this->defaultOrder : '';
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else
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{
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if($this->modelClass!==null)
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$schema=CActiveRecord::model($this->modelClass)->getDbConnection()->getSchema();
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$orders=array();
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foreach($directions as $attribute=>$descending)
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{
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$definition=$this->resolveAttribute($attribute);
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if(is_array($definition))
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{
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if($descending)
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$orders[]=isset($definition['desc']) ? $definition['desc'] : $attribute.' DESC';
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else
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$orders[]=isset($definition['asc']) ? $definition['asc'] : $attribute;
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}
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else if($definition!==false)
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{
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$attribute=$definition;
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if(isset($schema))
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{
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if(($pos=strpos($attribute,'.'))!==false)
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$attribute=$schema->quoteTableName(substr($attribute,0,$pos)).'.'.$schema->quoteColumnName(substr($attribute,$pos+1));
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else
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$attribute=CActiveRecord::model($this->modelClass)->getTableAlias(true).'.'.$schema->quoteColumnName($attribute);
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}
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$orders[]=$descending?$attribute.' DESC':$attribute;
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}
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}
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return implode(', ',$orders);
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}
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}
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/**
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* Generates a hyperlink that can be clicked to cause sorting.
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* @param string $attribute the attribute name. This must be the actual attribute name, not alias.
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* If it is an attribute of a related AR object, the name should be prefixed with
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* the relation name (e.g. 'author.name', where 'author' is the relation name).
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* @param string $label the link label. If null, the label will be determined according
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* to the attribute (see {@link resolveLabel}).
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* @param array $htmlOptions additional HTML attributes for the hyperlink tag
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* @return string the generated hyperlink
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*/
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public function link($attribute,$label=null,$htmlOptions=array())
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{
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if($label===null)
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$label=$this->resolveLabel($attribute);
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if(($definition=$this->resolveAttribute($attribute))===false)
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return $label;
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$directions=$this->getDirections();
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if(isset($directions[$attribute]))
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{
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$class=$directions[$attribute] ? 'desc' : 'asc';
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if(isset($htmlOptions['class']))
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$htmlOptions['class'].=' '.$class;
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else
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$htmlOptions['class']=$class;
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$descending=!$directions[$attribute];
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unset($directions[$attribute]);
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}
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else if(is_array($definition) && isset($definition['default']))
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$descending=$definition['default']==='desc';
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else
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$descending=false;
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if($this->multiSort)
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$directions=array_merge(array($attribute=>$descending),$directions);
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else
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$directions=array($attribute=>$descending);
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$url=$this->createUrl(Yii::app()->getController(),$directions);
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return $this->createLink($attribute,$label,$url,$htmlOptions);
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}
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/**
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* Resolves the attribute label for the specified attribute.
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* This will invoke {@link CActiveRecord::getAttributeLabel} to determine what label to use.
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* If the attribute refers to a virtual attribute declared in {@link attributes},
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* then the label given in the {@link attributes} will be returned instead.
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* @param string $attribute the attribute name.
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* @return string the attribute label
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*/
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public function resolveLabel($attribute)
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{
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$definition=$this->resolveAttribute($attribute);
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if(is_array($definition))
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{
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if(isset($definition['label']))
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return $definition['label'];
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}
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else if(is_string($definition))
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$attribute=$definition;
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if($this->modelClass!==null)
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return CActiveRecord::model($this->modelClass)->getAttributeLabel($attribute);
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else
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return $attribute;
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}
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/**
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* Returns the currently requested sort information.
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* @return array sort directions indexed by attribute names.
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* Sort direction can be either CSort::SORT_ASC for ascending order or
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* CSort::SORT_DESC for descending order.
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*/
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public function getDirections()
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{
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if($this->_directions===null)
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{
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$this->_directions=array();
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if(isset($_GET[$this->sortVar]) && is_string($_GET[$this->sortVar]))
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{
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$attributes=explode($this->separators[0],$_GET[$this->sortVar]);
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foreach($attributes as $attribute)
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{
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if(($pos=strrpos($attribute,$this->separators[1]))!==false)
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{
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$descending=substr($attribute,$pos+1)===$this->descTag;
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if($descending)
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$attribute=substr($attribute,0,$pos);
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}
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else
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|
$descending=false;
|
||
|
|
|
||
|
|
if(($this->resolveAttribute($attribute))!==false)
|
||
|
|
{
|
||
|
|
$this->_directions[$attribute]=$descending;
|
||
|
|
if(!$this->multiSort)
|
||
|
|
return $this->_directions;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if($this->_directions===array() && is_array($this->defaultOrder))
|
||
|
|
$this->_directions=$this->defaultOrder;
|
||
|
|
}
|
||
|
|
return $this->_directions;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns the sort direction of the specified attribute in the current request.
|
||
|
|
* @param string $attribute the attribute name
|
||
|
|
* @return mixed Sort direction of the attribute. Can be either CSort::SORT_ASC
|
||
|
|
* for ascending order or CSort::SORT_DESC for descending order. Value is null
|
||
|
|
* if the attribute doesn't need to be sorted.
|
||
|
|
*/
|
||
|
|
public function getDirection($attribute)
|
||
|
|
{
|
||
|
|
$this->getDirections();
|
||
|
|
return isset($this->_directions[$attribute]) ? $this->_directions[$attribute] : null;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Creates a URL that can lead to generating sorted data.
|
||
|
|
* @param CController $controller the controller that will be used to create the URL.
|
||
|
|
* @param array $directions the sort directions indexed by attribute names.
|
||
|
|
* The sort direction can be either CSort::SORT_ASC for ascending order or
|
||
|
|
* CSort::SORT_DESC for descending order.
|
||
|
|
* @return string the URL for sorting
|
||
|
|
*/
|
||
|
|
public function createUrl($controller,$directions)
|
||
|
|
{
|
||
|
|
$sorts=array();
|
||
|
|
foreach($directions as $attribute=>$descending)
|
||
|
|
$sorts[]=$descending ? $attribute.$this->separators[1].$this->descTag : $attribute;
|
||
|
|
$params=$this->params===null ? $_GET : $this->params;
|
||
|
|
$params[$this->sortVar]=implode($this->separators[0],$sorts);
|
||
|
|
return $controller->createUrl($this->route,$params);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns the real definition of an attribute given its name.
|
||
|
|
*
|
||
|
|
* The resolution is based on {@link attributes} and {@link CActiveRecord::attributeNames}.
|
||
|
|
* <ul>
|
||
|
|
* <li>When {@link attributes} is an empty array, if the name refers to an attribute of {@link modelClass},
|
||
|
|
* then the name is returned back.</li>
|
||
|
|
* <li>When {@link attributes} is not empty, if the name refers to an attribute declared in {@link attributes},
|
||
|
|
* then the corresponding virtual attribute definition is returned. Starting from version 1.1.3, if {@link attributes}
|
||
|
|
* contains a star ('*') element, the name will also be used to match against all model attributes.</li>
|
||
|
|
* <li>In all other cases, false is returned, meaning the name does not refer to a valid attribute.</li>
|
||
|
|
* </ul>
|
||
|
|
* @param string $attribute the attribute name that the user requests to sort on
|
||
|
|
* @return mixed the attribute name or the virtual attribute definition. False if the attribute cannot be sorted.
|
||
|
|
*/
|
||
|
|
public function resolveAttribute($attribute)
|
||
|
|
{
|
||
|
|
if($this->attributes!==array())
|
||
|
|
$attributes=$this->attributes;
|
||
|
|
else if($this->modelClass!==null)
|
||
|
|
$attributes=CActiveRecord::model($this->modelClass)->attributeNames();
|
||
|
|
else
|
||
|
|
return false;
|
||
|
|
foreach($attributes as $name=>$definition)
|
||
|
|
{
|
||
|
|
if(is_string($name))
|
||
|
|
{
|
||
|
|
if($name===$attribute)
|
||
|
|
return $definition;
|
||
|
|
}
|
||
|
|
else if($definition==='*')
|
||
|
|
{
|
||
|
|
if($this->modelClass!==null && CActiveRecord::model($this->modelClass)->hasAttribute($attribute))
|
||
|
|
return $attribute;
|
||
|
|
}
|
||
|
|
else if($definition===$attribute)
|
||
|
|
return $attribute;
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Creates a hyperlink based on the given label and URL.
|
||
|
|
* You may override this method to customize the link generation.
|
||
|
|
* @param string $attribute the name of the attribute that this link is for
|
||
|
|
* @param string $label the label of the hyperlink
|
||
|
|
* @param string $url the URL
|
||
|
|
* @param array $htmlOptions additional HTML options
|
||
|
|
* @return string the generated hyperlink
|
||
|
|
*/
|
||
|
|
protected function createLink($attribute,$label,$url,$htmlOptions)
|
||
|
|
{
|
||
|
|
return CHtml::link($label,$url,$htmlOptions);
|
||
|
|
}
|
||
|
|
}
|