dataClass = $dataClass;
$this->dataQuery = new DataQuery($this->dataClass);
parent::__construct();
}
/**
* Set the DataModel
*
* @param DataModel $model
*/
public function setDataModel(DataModel $model) {
$this->model = $model;
}
/**
* Get the dataClass name for this DataList, ie the DataObject ClassName
*
* @return string
*/
public function dataClass() {
return $this->dataClass;
}
/**
* When cloning this object, clone the dataQuery object as well
*/
public function __clone() {
$this->dataQuery = clone $this->dataQuery;
}
/**
* Return a copy of the internal {@link DataQuery} object
*
* Because the returned value is a copy, modifying it won't affect this list's contents. If
* you want to alter the data query directly, use the alterDataQuery method
*
* @return DataQuery
*/
public function dataQuery() {
return clone $this->dataQuery;
}
/**
* @var bool - Indicates if we are in an alterDataQueryCall already, so alterDataQuery can be re-entrant
*/
protected $inAlterDataQueryCall = false;
/**
* Return a new DataList instance with the underlying {@link DataQuery} object altered
*
* If you want to alter the underlying dataQuery for this list, this wrapper method
* will ensure that you can do so without mutating the existing List object.
*
* It clones this list, calls the passed callback function with the dataQuery of the new
* list as it's first parameter (and the list as it's second), then returns the list
*
* Note that this function is re-entrant - it's safe to call this inside a callback passed to
* alterDataQuery
*
* @param $callback
* @return DataList
*/
public function alterDataQuery($callback) {
if ($this->inAlterDataQueryCall) {
$list = $this;
$res = call_user_func($callback, $list->dataQuery, $list);
if ($res) $list->dataQuery = $res;
return $list;
}
else {
$list = clone $this;
$list->inAlterDataQueryCall = true;
try {
$res = call_user_func($callback, $list->dataQuery, $list);
if ($res) $list->dataQuery = $res;
}
catch (Exception $e) {
$list->inAlterDataQueryCall = false;
throw $e;
}
$list->inAlterDataQueryCall = false;
return $list;
}
}
/**
* Return a new DataList instance with the underlying {@link DataQuery} object changed
*
* @param DataQuery $dataQuery
* @return DataList
*/
public function setDataQuery(DataQuery $dataQuery) {
$clone = clone $this;
$clone->dataQuery = $dataQuery;
return $clone;
}
/**
* Returns a new DataList instance with the specified query parameter assigned
*
* @param string|array $keyOrArray Either the single key to set, or an array of key value pairs to set
* @param mixed $val If $keyOrArray is not an array, this is the value to set
* @return DataList
*/
public function setDataQueryParam($keyOrArray, $val = null) {
$clone = clone $this;
if(is_array($keyOrArray)) {
foreach($keyOrArray as $key => $val) {
$clone->dataQuery->setQueryParam($key, $val);
}
}
else {
$clone->dataQuery->setQueryParam($keyOrArray, $val);
}
return $clone;
}
/**
* Returns the SQL query that will be used to get this DataList's records. Good for debugging. :-)
*
* @param array $parameters Out variable for parameters required for this query
* @param string The resulting SQL query (may be paramaterised)
*/
public function sql(&$parameters = array()) {
return $this->dataQuery->query()->sql($parameters);
}
/**
* Return a new DataList instance with a WHERE clause added to this list's query.
*
* Supports parameterised queries.
* See SQLQuery::addWhere() for syntax examples, although DataList
* won't expand multiple method arguments as SQLQuery does.
*
* @param string|array|SQLConditionGroup $filter Predicate(s) to set, as escaped SQL statements or
* paramaterised queries
* @return DataList
*/
public function where($filter) {
return $this->alterDataQuery(function($query) use ($filter){
$query->where($filter);
});
}
/**
* Return a new DataList instance with a WHERE clause added to this list's query.
* All conditions provided in the filter will be joined with an OR
*
* Supports parameterised queries.
* See SQLQuery::addWhere() for syntax examples, although DataList
* won't expand multiple method arguments as SQLQuery does.
*
* @param string|array|SQLConditionGroup $filter Predicate(s) to set, as escaped SQL statements or
* paramaterised queries
* @return DataList
*/
public function whereAny($filter) {
return $this->alterDataQuery(function($query) use ($filter){
$query->whereAny($filter);
});
}
/**
* Returns true if this DataList can be sorted by the given field.
*
* @param string $fieldName
* @return boolean
*/
public function canSortBy($fieldName) {
return $this->dataQuery()->query()->canSortBy($fieldName);
}
/**
*
* @param string $fieldName
* @return boolean
*/
public function canFilterBy($fieldName) {
if($t = singleton($this->dataClass)->hasDatabaseField($fieldName)){
return true;
}
return false;
}
/**
* Return a new DataList instance with the records returned in this query
* restricted by a limit clause.
*
* @param int $limit
* @param int $offset
*/
public function limit($limit, $offset = 0) {
return $this->alterDataQuery(function($query) use ($limit, $offset){
$query->limit($limit, $offset);
});
}
/**
* Return a new DataList instance with distinct records or not
*
* @param bool $value
*/
public function distinct($value) {
return $this->alterDataQuery(function($query) use ($value){
$query->distinct($value);
});
}
/**
* Return a new DataList instance as a copy of this data list with the sort
* order set.
*
* @see SS_List::sort()
* @see SQLQuery::orderby
* @example $list = $list->sort('Name'); // default ASC sorting
* @example $list = $list->sort('Name DESC'); // DESC sorting
* @example $list = $list->sort('Name', 'ASC');
* @example $list = $list->sort(array('Name'=>'ASC', 'Age'=>'DESC'));
*
* @param String|array Escaped SQL statement. If passed as array, all keys and values are assumed to be escaped.
* @return DataList
*/
public function sort() {
$count = func_num_args();
if($count == 0) {
return $this;
}
if($count > 2) {
throw new InvalidArgumentException('This method takes zero, one or two arguments');
}
$sort = $col = $dir = null;
if ($count == 2) {
list($col, $dir) = func_get_args();
}
else {
$sort = func_get_arg(0);
}
return $this->alterDataQuery(function($query, $list) use ($sort, $col, $dir){
if ($col) {
// sort('Name','Desc')
if(!in_array(strtolower($dir),array('desc','asc'))){
user_error('Second argument to sort must be either ASC or DESC');
}
$query->sort($col, $dir);
}
else if(is_string($sort) && $sort){
// sort('Name ASC')
if(stristr($sort, ' asc') || stristr($sort, ' desc')) {
$query->sort($sort);
} else {
$query->sort($sort, 'ASC');
}
}
else if(is_array($sort)) {
// sort(array('Name'=>'desc'));
$query->sort(null, null); // wipe the sort
foreach($sort as $col => $dir) {
// Convert column expressions to SQL fragment, while still allowing the passing of raw SQL
// fragments.
try {
$relCol = $list->getRelationName($col);
} catch(InvalidArgumentException $e) {
$relCol = $col;
}
$query->sort($relCol, $dir, false);
}
}
});
}
/**
* Return a copy of this list which only includes items with these charactaristics
*
* @see SS_List::filter()
*
* @example $list = $list->filter('Name', 'bob'); // only bob in the list
* @example $list = $list->filter('Name', array('aziz', 'bob'); // aziz and bob in list
* @example $list = $list->filter(array('Name'=>'bob, 'Age'=>21)); // bob with the age 21
* @example $list = $list->filter(array('Name'=>'bob, 'Age'=>array(21, 43))); // bob with the Age 21 or 43
* @example $list = $list->filter(array('Name'=>array('aziz','bob'), 'Age'=>array(21, 43)));
* // aziz with the age 21 or 43 and bob with the Age 21 or 43
*
* @todo extract the sql from $customQuery into a SQLGenerator class
*
* @param string|array Escaped SQL statement. If passed as array, all keys and values will be escaped internally
* @return DataList
*/
public function filter() {
// Validate and process arguments
$arguments = func_get_args();
switch(sizeof($arguments)) {
case 1: $filters = $arguments[0]; break;
case 2: $filters = array($arguments[0] => $arguments[1]); break;
default:
throw new InvalidArgumentException('Incorrect number of arguments passed to filter()');
}
return $this->addFilter($filters);
}
/**
* Return a new instance of the list with an added filter
*
* @param array $filterArray
*/
public function addFilter($filterArray) {
$list = $this;
foreach($filterArray as $field => $value) {
$fieldArgs = explode(':', $field);
$field = array_shift($fieldArgs);
$filterType = array_shift($fieldArgs);
$modifiers = $fieldArgs;
$list = $list->applyFilterContext($field, $filterType, $modifiers, $value);
}
return $list;
}
/**
* Return a copy of this list which contains items matching any of these charactaristics.
*
* @example // only bob in the list
* $list = $list->filterAny('Name', 'bob');
* // SQL: WHERE "Name" = 'bob'
* @example // azis or bob in the list
* $list = $list->filterAny('Name', array('aziz', 'bob');
* // SQL: WHERE ("Name" IN ('aziz','bob'))
* @example // bob or anyone aged 21 in the list
* $list = $list->filterAny(array('Name'=>'bob, 'Age'=>21));
* // SQL: WHERE ("Name" = 'bob' OR "Age" = '21')
* @example // bob or anyone aged 21 or 43 in the list
* $list = $list->filterAny(array('Name'=>'bob, 'Age'=>array(21, 43)));
* // SQL: WHERE ("Name" = 'bob' OR ("Age" IN ('21', '43'))
* @example // all bobs, phils or anyone aged 21 or 43 in the list
* $list = $list->filterAny(array('Name'=>array('bob','phil'), 'Age'=>array(21, 43)));
* // SQL: WHERE (("Name" IN ('bob', 'phil')) OR ("Age" IN ('21', '43'))
*
* @todo extract the sql from this method into a SQLGenerator class
*
* @param string|array See {@link filter()}
* @return DataList
*/
public function filterAny() {
$numberFuncArgs = count(func_get_args());
$whereArguments = array();
if($numberFuncArgs == 1 && is_array(func_get_arg(0))) {
$whereArguments = func_get_arg(0);
} elseif($numberFuncArgs == 2) {
$whereArguments[func_get_arg(0)] = func_get_arg(1);
} else {
throw new InvalidArgumentException('Incorrect number of arguments passed to exclude()');
}
return $this->alterDataQuery(function($query, $list) use ($whereArguments) {
$subquery = $query->disjunctiveGroup();
foreach($whereArguments as $field => $value) {
$fieldArgs = explode(':',$field);
$field = array_shift($fieldArgs);
$filterType = array_shift($fieldArgs);
$modifiers = $fieldArgs;
// This is here since PHP 5.3 can't call protected/private methods in a closure.
$t = singleton($list->dataClass())->dbObject($field);
if($filterType) {
$className = "{$filterType}Filter";
} else {
$className = 'ExactMatchFilter';
}
if(!class_exists($className)){
$className = 'ExactMatchFilter';
array_unshift($modifiers, $filterType);
}
$t = new $className($field, $value, $modifiers);
$t->apply($subquery);
}
});
}
/**
* Note that, in the current implementation, the filtered list will be an ArrayList, but this may change in a
* future implementation.
* @see SS_Filterable::filterByCallback()
*
* @example $list = $list->filterByCallback(function($item, $list) { return $item->Age == 9; })
* @param callable $callback
* @return ArrayList (this may change in future implementations)
*/
public function filterByCallback($callback) {
if(!is_callable($callback)) {
throw new LogicException(sprintf(
"SS_Filterable::filterByCallback() passed callback must be callable, '%s' given",
gettype($callback)
));
}
$output = ArrayList::create();
foreach($this as $item) {
if(call_user_func($callback, $item, $this)) $output->push($item);
}
return $output;
}
/**
* Translates a {@link Object} relation name to a Database name and apply
* the relation join to the query. Throws an InvalidArgumentException if
* the $field doesn't correspond to a relation.
*
* @throws InvalidArgumentException
* @param string $field
*
* @return string
*/
public function getRelationName($field) {
if(!preg_match('/^[A-Z0-9._]+$/i', $field)) {
throw new InvalidArgumentException("Bad field expression $field");
}
if(strpos($field,'.') === false) {
return '"'.$field.'"';
}
$relations = explode('.', $field);
$fieldName = array_pop($relations);
$relationModelName = $this->dataQuery->applyRelation($field);
return '"'.$relationModelName.'"."'.$fieldName.'"';
}
/**
* Translates a filter type to a SQL query.
*
* @param string $field - the fieldname in the db
* @param string $filter - example StartsWith, relates to a filtercontext
* @param array $modifiers - Modifiers to pass to the filter, ie not,nocase
* @param string $value - the value that the filtercontext will use for matching
* @todo Deprecated SearchContexts and pull their functionality into the core of the ORM
*/
private function applyFilterContext($field, $filter, $modifiers, $value) {
if($filter) {
$className = "{$filter}Filter";
} else {
$className = 'ExactMatchFilter';
}
if(!class_exists($className)) {
$className = 'ExactMatchFilter';
array_unshift($modifiers, $filter);
}
$t = new $className($field, $value, $modifiers);
return $this->alterDataQuery(array($t, 'apply'));
}
/**
* Return a copy of this list which does not contain any items with these charactaristics
*
* @see SS_List::exclude()
* @example $list = $list->exclude('Name', 'bob'); // exclude bob from list
* @example $list = $list->exclude('Name', array('aziz', 'bob'); // exclude aziz and bob from list
* @example $list = $list->exclude(array('Name'=>'bob, 'Age'=>21)); // exclude bob that has Age 21
* @example $list = $list->exclude(array('Name'=>'bob, 'Age'=>array(21, 43))); // exclude bob with Age 21 or 43
* @example $list = $list->exclude(array('Name'=>array('bob','phil'), 'Age'=>array(21, 43)));
* // bob age 21 or 43, phil age 21 or 43 would be excluded
*
* @todo extract the sql from this method into a SQLGenerator class
*
* @param string|array Escaped SQL statement. If passed as array, all keys and values will be escaped internally
* @return DataList
*/
public function exclude() {
$numberFuncArgs = count(func_get_args());
$whereArguments = array();
if($numberFuncArgs == 1 && is_array(func_get_arg(0))) {
$whereArguments = func_get_arg(0);
} elseif($numberFuncArgs == 2) {
$whereArguments[func_get_arg(0)] = func_get_arg(1);
} else {
throw new InvalidArgumentException('Incorrect number of arguments passed to exclude()');
}
return $this->alterDataQuery(function($query, $list) use ($whereArguments) {
$subquery = $query->disjunctiveGroup();
foreach($whereArguments as $field => $value) {
$fieldArgs = explode(':', $field);
$field = array_shift($fieldArgs);
$filterType = array_shift($fieldArgs);
$modifiers = $fieldArgs;
// This is here since PHP 5.3 can't call protected/private methods in a closure.
$t = singleton($list->dataClass())->dbObject($field);
if($filterType) {
$className = "{$filterType}Filter";
} else {
$className = 'ExactMatchFilter';
}
if(!class_exists($className)){
$className = 'ExactMatchFilter';
array_unshift($modifiers, $filterType);
}
$t = new $className($field, $value, $modifiers);
$t->exclude($subquery);
}
});
}
/**
* This method returns a copy of this list that does not contain any DataObjects that exists in $list
*
* The $list passed needs to contain the same dataclass as $this
*
* @param SS_List $list
* @return DataList
* @throws BadMethodCallException
*/
public function subtract(SS_List $list) {
if($this->dataclass() != $list->dataclass()) {
throw new InvalidArgumentException('The list passed must have the same dataclass as this class');
}
return $this->alterDataQuery(function($query) use ($list){
$query->subtract($list->dataQuery());
});
}
/**
* Return a new DataList instance with an inner join clause added to this list's query.
*
* @param string $table Table name (unquoted and as escaped SQL)
* @param string $onClause Escaped SQL statement, e.g. '"Table1"."ID" = "Table2"."ID"'
* @param string $alias - if you want this table to be aliased under another name
* @param int $order A numerical index to control the order that joins are added to the query; lower order values
* will cause the query to appear first. The default is 20, and joins created automatically by the
* ORM have a value of 10.
* @param array $parameters Any additional parameters if the join is a parameterised subquery
* @return DataList
*/
public function innerJoin($table, $onClause, $alias = null, $order = 20, $parameters = array()) {
return $this->alterDataQuery(function($query) use ($table, $onClause, $alias, $order, $parameters){
$query->innerJoin($table, $onClause, $alias, $order, $parameters);
});
}
/**
* Return a new DataList instance with a left join clause added to this list's query.
*
* @param string $table Table name (unquoted and as escaped SQL)
* @param string $onClause Escaped SQL statement, e.g. '"Table1"."ID" = "Table2"."ID"'
* @param string $alias - if you want this table to be aliased under another name
* @param int $order A numerical index to control the order that joins are added to the query; lower order values
* will cause the query to appear first. The default is 20, and joins created automatically by the
* ORM have a value of 10.
* @param array $parameters Any additional parameters if the join is a parameterised subquery
* @return DataList
*/
public function leftJoin($table, $onClause, $alias = null, $order = 20, $parameters = array()) {
return $this->alterDataQuery(function($query) use ($table, $onClause, $alias, $order, $parameters){
$query->leftJoin($table, $onClause, $alias, $order, $parameters);
});
}
/**
* Return an array of the actual items that this DataList contains at this stage.
* This is when the query is actually executed.
*
* @return array
*/
public function toArray() {
$query = $this->dataQuery->query();
$rows = $query->execute();
$results = array();
foreach($rows as $row) {
$results[] = $this->createDataObject($row);
}
return $results;
}
/**
* Return this list as an array and every object it as an sub array as well
*
* @return array
*/
public function toNestedArray() {
$result = array();
foreach($this as $item) {
$result[] = $item->toMap();
}
return $result;
}
/**
* Walks the list using the specified callback
*
* @param callable $callback
* @return DataList
*/
public function each($callback) {
foreach($this as $row) {
$callback($row);
}
return $this;
}
public function debug() {
$val = "" . $this->class . "
";
foreach($this->toNestedArray() as $item) {
$val .= "- " . Debug::text($item) . "
";
}
$val .= "
";
return $val;
}
/**
* Returns a map of this list
*
* @param string $keyField - the 'key' field of the result array
* @param string $titleField - the value field of the result array
* @return SS_Map
*/
public function map($keyField = 'ID', $titleField = 'Title') {
return new SS_Map($this, $keyField, $titleField);
}
/**
* Create a DataObject from the given SQL row
*
* @param array $row
* @return DataObject
*/
protected function createDataObject($row) {
$defaultClass = $this->dataClass;
// Failover from RecordClassName to ClassName
if(empty($row['RecordClassName'])) {
$row['RecordClassName'] = $row['ClassName'];
}
// Instantiate the class mentioned in RecordClassName only if it exists, otherwise default to $this->dataClass
if(class_exists($row['RecordClassName'])) {
$item = Injector::inst()->create($row['RecordClassName'], $row, false, $this->model);
} else {
$item = Injector::inst()->create($defaultClass, $row, false, $this->model);
}
//set query params on the DataObject to tell the lazy loading mechanism the context the object creation context
$item->setSourceQueryParams($this->dataQuery()->getQueryParams());
return $item;
}
/**
* Returns an Iterator for this DataList.
* This function allows you to use DataLists in foreach loops
*
* @return ArrayIterator
*/
public function getIterator() {
return new ArrayIterator($this->toArray());
}
/**
* Return the number of items in this DataList
*
* @return int
*/
public function count() {
return $this->dataQuery->count();
}
/**
* Return the maximum value of the given field in this DataList
*
* @param string $fieldName
* @return mixed
*/
public function max($fieldName) {
return $this->dataQuery->max($fieldName);
}
/**
* Return the minimum value of the given field in this DataList
*
* @param string $fieldName
* @return mixed
*/
public function min($fieldName) {
return $this->dataQuery->min($fieldName);
}
/**
* Return the average value of the given field in this DataList
*
* @param string $fieldName
* @return mixed
*/
public function avg($fieldName) {
return $this->dataQuery->avg($fieldName);
}
/**
* Return the sum of the values of the given field in this DataList
*
* @param string $fieldName
* @return mixed
*/
public function sum($fieldName) {
return $this->dataQuery->sum($fieldName);
}
/**
* Returns the first item in this DataList
*
* @return DataObject
*/
public function first() {
foreach($this->dataQuery->firstRow()->execute() as $row) {
return $this->createDataObject($row);
}
}
/**
* Returns the last item in this DataList
*
* @return DataObject
*/
public function last() {
foreach($this->dataQuery->lastRow()->execute() as $row) {
return $this->createDataObject($row);
}
}
/**
* Returns true if this DataList has items
*
* @return bool
*/
public function exists() {
return $this->count() > 0;
}
/**
* Find the first DataObject of this DataList where the given key = value
*
* @param string $key
* @param string $value
* @return DataObject|null
*/
public function find($key, $value) {
return $this->filter($key, $value)->first();
}
/**
* Restrict the columns to fetch into this DataList
*
* @param array $queriedColumns
* @return DataList
*/
public function setQueriedColumns($queriedColumns) {
return $this->alterDataQuery(function($query) use ($queriedColumns){
$query->setQueriedColumns($queriedColumns);
});
}
/**
* Filter this list to only contain the given Primary IDs
*
* @param array $ids Array of integers
* @return DataList
*/
public function byIDs(array $ids) {
return $this->filter('ID', $ids);
}
/**
* Return the first DataObject with the given ID
*
* @param int $id
* @return DataObject
*/
public function byID($id) {
return $this->filter('ID', $id)->first();
}
/**
* Returns an array of a single field value for all items in the list.
*
* @param string $colName
* @return array
*/
public function column($colName = "ID") {
return $this->dataQuery->column($colName);
}
// Member altering methods
/**
* Sets the ComponentSet to be the given ID list.
* Records will be added and deleted as appropriate.
*
* @param array $idList List of IDs.
*/
public function setByIDList($idList) {
$has = array();
// Index current data
foreach($this->column() as $id) {
$has[$id] = true;
}
// Keep track of items to delete
$itemsToDelete = $has;
// add items in the list
// $id is the database ID of the record
if($idList) foreach($idList as $id) {
unset($itemsToDelete[$id]);
if($id && !isset($has[$id])) {
$this->add($id);
}
}
// Remove any items that haven't been mentioned
$this->removeMany(array_keys($itemsToDelete));
}
/**
* Returns an array with both the keys and values set to the IDs of the records in this list.
*
*/
public function getIDList() {
$ids = $this->column("ID");
return $ids ? array_combine($ids, $ids) : array();
}
/**
* Returns a HasManyList or ManyMany list representing the querying of a relation across all
* objects in this data list. For it to work, the relation must be defined on the data class
* that you used to create this DataList.
*
* Example: Get members from all Groups:
*
* DataList::Create("Group")->relation("Members")
*
* @param string $relationName
* @return HasManyList|ManyManyList
*/
public function relation($relationName) {
$ids = $this->column('ID');
return singleton($this->dataClass)->$relationName()->forForeignID($ids);
}
public function dbObject($fieldName) {
return singleton($this->dataClass)->dbObject($fieldName);
}
/**
* Add a number of items to the component set.
*
* @param array $items Items to add, as either DataObjects or IDs.
* @return DataList
*/
public function addMany($items) {
foreach($items as $item) {
$this->add($item);
}
return $this;
}
/**
* Remove the items from this list with the given IDs
*
* @param array $idList
* @return DataList
*/
public function removeMany($idList) {
foreach($idList as $id) {
$this->removeByID($id);
}
return $this;
}
/**
* Remove every element in this DataList matching the given $filter.
*
* @param string $filter - a sql type where filter
* @return DataList
*/
public function removeByFilter($filter) {
foreach($this->where($filter) as $item) {
$this->remove($item);
}
return $this;
}
/**
* Remove every element in this DataList.
*
* @return DataList
*/
public function removeAll() {
foreach($this as $item) {
$this->remove($item);
}
return $this;
}
/**
* This method are overloaded by HasManyList and ManyMany list to perform more sophisticated
* list manipulation
*
* @param mixed $item
*/
public function add($item) {
// Nothing needs to happen by default
// TO DO: If a filter is given to this data list then
}
/**
* Return a new item to add to this DataList.
*
* @todo This doesn't factor in filters.
*/
public function newObject($initialFields = null) {
$class = $this->dataClass;
return Injector::inst()->create($class, $initialFields, false, $this->model);
}
/**
* Remove this item by deleting it
*
* @param DataClass $item
* @todo Allow for amendment of this behaviour - for example, we can remove an item from
* an "ActiveItems" DataList by chaning the status to inactive.
*/
public function remove($item) {
// By default, we remove an item from a DataList by deleting it.
$this->removeByID($item->ID);
}
/**
* Remove an item from this DataList by ID
*
* @param int $itemID - The primary ID
*/
public function removeByID($itemID) {
$item = $this->byID($itemID);
if($item) {
return $item->delete();
}
}
/**
* Reverses a list of items.
*
* @return DataList
*/
public function reverse() {
return $this->alterDataQuery(function($query){
$query->reverseSort();
});
}
/**
* This method won't function on DataLists due to the specific query that it represent
*
* @param mixed $item
*/
public function push($item) {
user_error("Can't call DataList::push() because its data comes from a specific query.", E_USER_ERROR);
}
/**
* This method won't function on DataLists due to the specific query that it represent
*
* @param mixed $item
*/
public function insertFirst($item) {
user_error("Can't call DataList::insertFirst() because its data comes from a specific query.", E_USER_ERROR);
}
/**
* This method won't function on DataLists due to the specific query that it represent
*
*/
public function shift() {
user_error("Can't call DataList::shift() because its data comes from a specific query.", E_USER_ERROR);
}
/**
* This method won't function on DataLists due to the specific query that it represent
*
*/
public function replace() {
user_error("Can't call DataList::replace() because its data comes from a specific query.", E_USER_ERROR);
}
/**
* This method won't function on DataLists due to the specific query that it represent
*
*/
public function merge() {
user_error("Can't call DataList::merge() because its data comes from a specific query.", E_USER_ERROR);
}
/**
* This method won't function on DataLists due to the specific query that it represent
*
*/
public function removeDuplicates() {
user_error("Can't call DataList::removeDuplicates() because its data comes from a specific query.",
E_USER_ERROR);
}
/**
* Returns whether an item with $key exists
*
* @param mixed $key
* @return bool
*/
public function offsetExists($key) {
return ($this->limit(1,$key)->First() != null);
}
/**
* Returns item stored in list with index $key
*
* @param mixed $key
* @return DataObject
*/
public function offsetGet($key) {
return $this->limit(1, $key)->First();
}
/**
* Set an item with the key in $key
*
* @param mixed $key
* @param mixed $value
*/
public function offsetSet($key, $value) {
user_error("Can't alter items in a DataList using array-access", E_USER_ERROR);
}
/**
* Unset an item with the key in $key
*
* @param mixed $key
*/
public function offsetUnset($key) {
user_error("Can't alter items in a DataList using array-access", E_USER_ERROR);
}
}