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<?php
/**
* A list object that wraps around an array of objects or arrays.
*
* @package sapphire
* @subpackage model
*/
class ArrayList extends ViewableData implements SS_List {
/**
* Holds the items in the list
*
* @var array
*/
protected $items;
/**
* Synonym of the constructor. Can be chained with literate methods.
* ArrayList::create("SiteTree")->sort("Title") is legal, but
* new ArrayList("SiteTree")->sort("Title") is not.
*
* @param array $items - an initial array to fill this object with
*/
public static function create(array $items = array()) {
return new ArrayList($items);
}
/**
*
* @param array $items - an initial array to fill this object with
*/
public function __construct(array $items = array()) {
$this->items = $items;
parent::__construct();
}
/**
* Return the number of items in this list
*
* @return int
*/
public function count() {
return count($this->items);
}
/**
* Returns true if this list has items
*
* @return bool
*/
public function exists() {
return (bool) count($this);
}
/**
* Returns an Iterator for this ArrayList.
* This function allows you to use ArrayList in foreach loops
*
* @return ArrayIterator
*/
public function getIterator() {
return new ArrayIterator($this->items);
}
/**
* Return an array of the actual items that this ArrayList contains.
*
* @return array
*/
public function toArray() {
return $this->items;
}
public function debug() {
$val = "<h2>" . $this->class . "</h2><ul>";
foreach($this->toNestedArray() as $item) {
$val .= "<li style=\"list-style-type: disc; margin-left: 20px\">" . Debug::text($item) . "</li>";
}
$val .= "</ul>";
return $val;
}
/**
* 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->items as $item) {
if (is_object($item)) {
if (method_exists($item, 'toMap')) {
$result[] = $item->toMap();
} else {
$result[] = (array) $item;
}
} else {
$result[] = $item;
}
}
return $result;
}
/**
* Get a sub-range of this dataobjectset as an array
*
* @param int $offset
* @param int $length
* @return ArrayList
*/
public function getRange($offset, $length) {
return new ArrayList(array_slice($this->items, $offset, $length));
}
/**
* Add this $item into this list
*
* @param mixed $item
*/
public function add($item) {
$this->push($item);
}
/**
* Remove this item from this list
*
* @param mixed $item
*/
public function remove($item) {
foreach ($this->items as $key => $value) {
if ($item === $value) unset($this->items[$key]);
}
}
/**
* Replaces an item in this list with another item.
*
* @param array|object $item
* @param array|object $with
* @return void;
*/
public function replace($item, $with) {
foreach ($this->items as $key => $candidate) {
if ($candidate === $item) {
$this->items[$key] = $with;
return;
}
}
}
/**
* Merges with another array or list by pushing all the items in it onto the
* end of this list.
*
* @param array|object $with
*/
public function merge($with) {
foreach ($with as $item) $this->push($item);
}
/**
* Removes items from this list which have a duplicate value for a certain
* field. This is especially useful when combining lists.
*
* @param string $field
*/
public function removeDuplicates($field = 'ID') {
$seen = array();
foreach ($this->items as $key => $item) {
$value = $this->extractValue($item, $field);
if (array_key_exists($value, $seen)) {
unset($this->items[$key]);
}
$seen[$value] = true;
}
}
/**
* Pushes an item onto the end of this list.
*
* @param array|object $item
*/
public function push($item) {
$this->items[] = $item;
}
/**
* Pops the last element off the end of the list and returns it.
*
* @return array|object
*/
public function pop() {
return array_pop($this->items);
}
/**
* Add an item onto the beginning of the list.
*
* @param array|object $item
*/
public function unshift($item) {
array_unshift($this->items, $item);
}
/**
* Shifts the item off the beginning of the list and returns it.
*
* @return array|object
*/
public function shift() {
return array_shift($this->items);
}
/**
* Returns the first item in the list
*
* @return mixed
*/
public function first() {
return reset($this->items);
}
/**
* Returns the last item in the list
*
* @return mixed
*/
public function last() {
return end($this->items);
}
/**
* Returns a map of this list
*
* @param type $keyfield - the 'key' field of the result array
* @param type $titlefield - the value field of the result array
* @return array
*/
public function map($keyfield = 'ID', $titlefield = 'Title') {
$map = array();
foreach ($this->items as $item) {
$map[$this->extractValue($item, $keyfield)] = $this->extractValue($item, $titlefield);
}
return $map;
}
/**
* Find the first item of this list where the given key = value
*
* @param type $key
* @param type $value
* @return type
*/
public function find($key, $value) {
foreach ($this->items as $item) {
if ($this->extractValue($item, $key) == $value) return $item;
}
}
/**
* Returns an array of a single field value for all items in the list.
*
* @param string $colName
* @return array
*/
public function column($colName = 'ID') {
$result = array();
foreach ($this->items as $item) {
$result[] = $this->extractValue($item, $colName);
}
return $result;
}
/**
* You can always sort a ArrayList
*
* @param string $by
* @return bool
*/
public function canSortBy($by) {
return true;
}
/**
* Sorts this list by one or more fields. You can either pass in a single
* field name and direction, or a map of field names to sort directions.
*
* @return DataList
* @see SS_List::sort()
* @example $list->sort('Name'); // default ASC sorting
* @example $list->sort('Name DESC'); // DESC sorting
* @example $list->sort('Name', 'ASC');
* @example $list->sort(array('Name'=>'ASC,'Age'=>'DESC'));
*/
public function sort() {
$args = func_get_args();
if(count($args)==0){
return $this;
}
if(count($args)>2){
throw new InvalidArgumentException('This method takes zero, one or two arguments');
}
// One argument and it's a string
if(count($args)==1 && is_string($args[0])){
$column = $args[0];
if(strpos($column, ' ') !== false) throw new InvalidArgumentException("You can't pass SQL fragments to sort()");
$columnsToSort[$column] = SORT_ASC;
} else if(count($args)==2){
$columnsToSort[$args[0]]=(strtolower($args[1])=='desc')?SORT_DESC:SORT_ASC;
} else if(is_array($args[0])) {
foreach($args[0] as $column => $sort_order){
$columnsToSort[$column] = (strtolower($sort_order)=='desc')?SORT_DESC:SORT_ASC;
}
} else {
throw new InvalidArgumentException("Bad arguments passed to sort()");
}
// This the main sorting algorithm that supports infinite sorting params
$multisortArgs = array();
$values = array();
foreach($columnsToSort as $column => $direction ) {
// The reason these are added to columns is of the references, otherwise when the foreach
// is done, all $values and $direction look the same
$values[$column] = array();
$sortDirection[$column] = $direction;
// We need to subtract every value into a temporary array for sorting
foreach($this->items as $index => $item) {
$values[$column][] = $this->extractValue($item, $column);
}
// PHP 5.3 requires below arguments to be reference when using array_multisort together
// with call_user_func_array
// First argument is the 'value' array to be sorted
$multisortArgs[] = &$values[$column];
// First argument is the direction to be sorted,
$multisortArgs[] = &$sortDirection[$column];
}
// As the last argument we pass in a reference to the items that all the sorting will be
// applied upon
$multisortArgs[] = &$this->items;
call_user_func_array('array_multisort', $multisortArgs);
return $this;
}
/**
* Filter the list to include items with these charactaristics
*
* @return ArrayList
* @see SS_List::filter()
* @example $list->filter('Name', 'bob'); // only bob in the list
* @example $list->filter('Name', array('aziz', 'bob'); // aziz and bob in list
* @example $list->filter(array('Name'=>'bob, 'Age'=>21)); // bob with the Age 21 in list
* @example $list->filter(array('Name'=>'bob, 'Age'=>array(21, 43))); // bob with the Age 21 or 43
* @example $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
*/
public function filter() {
if(count(func_get_args())>2){
throw new InvalidArgumentException('filter takes one array or two arguments');
}
if(count(func_get_args()) == 1 && !is_array(func_get_arg(0))){
throw new InvalidArgumentException('filter takes one array or two arguments');
}
$keepUs = array();
if(count(func_get_args())==2){
$keepUs[func_get_arg(0)] = func_get_arg(1);
}
if(count(func_get_args())==1 && is_array(func_get_arg(0))){
foreach(func_get_arg(0) as $column => $value) {
$keepUs[$column] = $value;
}
}
$itemsToKeep = array();
foreach($this->items as $item){
$keepItem = true;
foreach($keepUs as $column => $value ) {
if(is_array($value) && !in_array($this->extractValue($item, $column), $value)) {
$keepItem = false;
} elseif(!is_array($value) && $this->extractValue($item, $column) != $value) {
$keepItem = false;
}
}
if($keepItem) {
$itemsToKeep[] = $item;
}
}
$this->items = $itemsToKeep;
return $this;
}
public function byID($id) {
return $this->filter("ID", $id)->First();
}
/**
* Exclude the list to not contain items with these charactaristics
*
* @return ArrayList
* @see SS_List::exclude()
* @example $list->exclude('Name', 'bob'); // exclude bob from list
* @example $list->exclude('Name', array('aziz', 'bob'); // exclude aziz and bob from list
* @example $list->exclude(array('Name'=>'bob, 'Age'=>21)); // exclude bob that has Age 21
* @example $list->exclude(array('Name'=>'bob, 'Age'=>array(21, 43))); // exclude bob with Age 21 or 43
* @example $list->exclude(array('Name'=>array('bob','phil'), 'Age'=>array(21, 43))); // bob age 21 or 43, phil age 21 or 43 would be excluded
*/
public function exclude() {
if(count(func_get_args())>2){
throw new InvalidArgumentException('exclude() takes one array or two arguments');
}
if(count(func_get_args()) == 1 && !is_array(func_get_arg(0))){
throw new InvalidArgumentException('exclude() takes one array or two arguments');
}
$removeUs = array();
if(count(func_get_args())==2){
$removeUs[func_get_arg(0)] = func_get_arg(1);
}
if(count(func_get_args())==1 && is_array(func_get_arg(0))){
foreach(func_get_arg(0) as $column => $excludeValue) {
$removeUs[$column] = $excludeValue;
}
}
$itemsToKeep = array();
$hitsRequiredToRemove = count($removeUs);
$matches = array();
foreach($removeUs as $column => $excludeValue) {
foreach($this->items as $key => $item){
if(!is_array($excludeValue) && $this->extractValue($item, $column) == $excludeValue) {
$matches[$key]=isset($matches[$key])?$matches[$key]+1:1;
} elseif(is_array($excludeValue) && in_array($this->extractValue($item, $column), $excludeValue)) {
$matches[$key]=isset($matches[$key])?$matches[$key]+1:1;
}
}
}
$keysToRemove = array_keys($matches,$hitsRequiredToRemove);
foreach($keysToRemove as $itemToRemoveIdx){
$this->remove($this->items[$itemToRemoveIdx]);
}
return;
return $this;
}
protected function shouldExclude($item, $args) {
}
/**
* Returns whether an item with $key exists
*
* @param mixed $key
* @return bool
*/
public function offsetExists($offset) {
return array_key_exists($offset, $this->items);
}
/**
* Returns item stored in list with index $key
*
* @param mixed $key
* @return DataObject
*/
public function offsetGet($offset) {
if ($this->offsetExists($offset)) return $this->items[$offset];
}
/**
* Set an item with the key in $key
*
* @param mixed $key
* @param mixed $value
*/
public function offsetSet($offset, $value) {
$this->items[$offset] = $value;
}
/**
* Unset an item with the key in $key
*
* @param mixed $key
*/
public function offsetUnset($offset) {
unset($this->items[$offset]);
}
/**
* Extracts a value from an item in the list, where the item is either an
* object or array.
*
* @param array|object $item
* @param string $key
* @return mixed
*/
protected function extractValue($item, $key) {
if (is_object($item)) {
return $item->$key;
} else {
if (array_key_exists($key, $item)) return $item[$key];
}
}
}
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