2008-08-06 05:28:25 +02:00
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<?php
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/**
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* Manages searching of properties on one or more {@link DataObject}
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* types, based on a given set of input parameters.
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* SearchContext is intentionally decoupled from any controller-logic,
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* it just receives a set of search parameters and an object class it acts on.
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*
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* The default output of a SearchContext is either a {@link SQLQuery} object
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* for further refinement, or a {@link DataObjectSet} that can be used to display
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* search results, e.g. in a {@link TableListField} instance.
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*
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* In case you need multiple contexts, consider namespacing your request parameters
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* by using {@link FieldSet->namespace()} on the $fields constructor parameter.
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*
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* @usedby {@link ModelAdmin}
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*
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* @param string $modelClass The base {@link DataObject} class that search properties related to.
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* Also used to generate a set of result objects based on this class.
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* @param FieldSet $fields Optional. FormFields mapping to {@link DataObject::$db} properties
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* which are to be searched. Derived from modelclass using
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* {@link DataObject::scaffoldSearchFields()} if left blank.
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* @param array $filters Optional. Derived from modelclass if left blank
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*/
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class SearchContext extends Object {
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/**
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* DataObject subclass to which search parameters relate to.
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* Also determines as which object each result is provided.
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*
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* @var string
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*/
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protected $modelClass;
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/**
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* FormFields mapping to {@link DataObject::$db} properties
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* which are supposed to be searchable.
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*
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* @var FieldSet
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*/
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protected $fields;
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/**
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* Array of {@link SearchFilter} subclasses.
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*
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* @var array
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*/
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protected $filters;
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/**
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* A key value pair of values that should be searched for.
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* The keys should match the field names specified in {@link self::$fields}.
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* Usually these values come from a submitted searchform
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* in the form of a $_REQUEST object.
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* CAUTION: All values should be treated as insecure client input.
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*
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* @var array
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protected $params;
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*/
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/**
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* Require either all search filters to be evaluated to true,
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* or just a single one.
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*
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* @todo Not Implemented
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* @var string
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*/
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protected $booleanSearchType = 'AND';
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function __construct($modelClass, $fields = null, $filters = null) {
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$this->modelClass = $modelClass;
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$this->fields = $fields;
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$this->filters = $filters;
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parent::__construct();
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}
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2008-08-09 05:54:55 +02:00
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/**
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* Returns scaffolded search fields for UI.
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*
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* @todo is this necessary in the SearchContext? - ModelAdmin could unwrap this and just use DataObject::scaffoldSearchFields
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* @return FieldSet
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*/
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2008-08-06 05:28:25 +02:00
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public function getSearchFields() {
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return ($this->fields) ? $this->fields : singleton($this->modelClass)->scaffoldSearchFields();
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}
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/**
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* Get the query object augumented with all clauses from
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* the connected {@link SearchFilter}s
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*
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* @todo query generation
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*
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* @param array $searchParams
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* @return SQLQuery
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*/
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public function getQuery($searchParams) {
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$q = new SQLQuery("*", $this->modelClass);
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$this->processFilters($q);
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return $q;
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}
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/**
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* Light wrapper around {@link getQuery()}.
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*
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* @param array $searchParams
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* @param int $start
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* @param int $limit
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* @return DataObjectSet
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*/
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public function getResults($searchParams, $start = false, $limit = false) {
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$q = $this->getQuery($searchParams);
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//$q->limit = $start ? "$start, $limit" : $limit;
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$output = new DataObjectSet();
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foreach($q->execute() as $row) {
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$className = $row['RecordClassName'];
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$output->push(new $className($row));
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}
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// do the setting of start/limit on the dataobjectset
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return $output;
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}
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/**
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* @todo documentation
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* @todo implementation
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*
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* @param array $searchFilters
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* @param SQLQuery $query
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*/
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protected function processFilters($searchFilters, SQLQuery &$query) {
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foreach($this->filters as $filter) {
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$filter->updateQuery($searchFilters, $tableName, $query);
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}
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}
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// ############ Getters/Setters ###########
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public function getFields() {
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return $this->fields;
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}
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public function setFields($fields) {
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$this->fields = $fields;
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}
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public function getFilters() {
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2008-08-09 05:54:55 +02:00
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return $this->fields;
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2008-08-06 05:28:25 +02:00
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}
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public function setFilters($filters) {
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$this->filters = $filters;
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}
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2008-08-06 05:43:48 +02:00
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function clearEmptySearchFields($value) {
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return ($value != '');
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}
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/**
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* Placeholder, until I figure out the rest of the SQLQuery stuff
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* and link the $searchable_fields array to the SearchContext
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*/
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public function getResultSet($fields) {
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$filter = "";
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$current = 1;
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$fields = array_filter($fields, array($this,'clearEmptySearchFields'));
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$length = count($fields);
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foreach($fields as $key=>$val) {
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2008-08-09 04:16:46 +02:00
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// Array values come from more complex fields - for now let's just disable searching on them
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if (!is_array($val) && $val != '') {
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2008-08-06 05:43:48 +02:00
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$filter .= "`$key`='$val'";
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} else {
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$length--;
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}
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if ($current < $length) {
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$filter .= " AND ";
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}
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$current++;
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}
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return DataObject::get($this->modelClass, $filter);
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}
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2008-08-06 05:28:25 +02:00
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}
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?>
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