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<?php
/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
namespace Icinga\Data\Filter;
use Icinga\Web\UrlParams;
use Icinga\Exception\ProgrammingError;
/**
* Filter
*
* Base class for filters (why?) and factory for the different FilterOperators
*/
abstract class Filter
{
protected $id = '1';
public function setId($id)
{
$this->id = (string) $id;
return $this;
}
abstract public function isExpression();
abstract public function isChain();
abstract public function isEmpty();
abstract public function toQueryString();
abstract public function andFilter(Filter $filter);
abstract public function orFilter(Filter $filter);
/**
* Whether the give row matches this Filter
*
* @param mixed $row Preferrably an stdClass instance
* @return bool
*/
abstract public function matches($row);
public function getUrlParams()
{
return UrlParams::fromQueryString($this->toQueryString());
}
public function getById($id)
{
if ((string) $id === $this->getId()) {
return $this;
}
throw new ProgrammingError(
'Trying to get invalid filter index "%s" from "%s" ("%s")',
$id,
$this,
$this->id
);
}
public function getId()
{
return $this->id;
}
public function isRootNode()
{
return false === strpos($this->id, '-');
}
abstract public function listFilteredColumns();
public function applyChanges($changes)
{
$filter = $this;
$pairs = array();
foreach ($changes as $k => $v) {
if (preg_match('/^(column|value|sign|operator)_([\d-]+)$/', $k, $m)) {
$pairs[$m[2]][$m[1]] = $v;
}
}
$operators = array();
foreach ($pairs as $id => $fs) {
if (array_key_exists('operator', $fs)) {
$operators[$id] = $fs['operator'];
} else {
$f = $filter->getById($id);
$f->setColumn($fs['column']);
if ($f->getSign() !== $fs['sign']) {
if ($f->isRootNode()) {
$filter = $f->setSign($fs['sign']);
} else {
$filter->replaceById($id, $f->setSign($fs['sign']));
}
}
$f->setExpression($fs['value']);
}
}
krsort($operators, SORT_NATURAL);
foreach ($operators as $id => $operator) {
$f = $filter->getById($id);
if ($f->getOperatorName() !== $operator) {
if ($f->isRootNode()) {
$filter = $f->setOperatorName($operator);
} else {
$filter->replaceById($id, $f->setOperatorName($operator));
}
}
}
return $filter;
}
public function getParentId()
{
if ($this->isRootNode()) {
throw new ProgrammingError('Filter root nodes have no parent');
}
return substr($this->id, 0, strrpos($this->id, '-'));
}
public function getParent()
{
return $this->getById($this->getParentId());
}
public function hasId($id)
{
if ($id === $this->getId()) {
return true;
}
return false;
}
/**
* Where Filter factory
*
* @param string $col Column to be filtered
* @param string $filter Filter expression
*
* @throws FilterException
* @return FilterExpression
*/
public static function where($col, $filter)
{
return new FilterExpression($col, '=', $filter);
}
public static function expression($col, $op, $expression)
{
switch ($op) {
case '=':
return new FilterMatch($col, $op, $expression);
case '<':
return new FilterLessThan($col, $op, $expression);
case '>':
return new FilterGreaterThan($col, $op, $expression);
case '>=':
return new FilterEqualOrGreaterThan($col, $op, $expression);
case '<=':
return new FilterEqualOrLessThan($col, $op, $expression);
case '!=':
return new FilterMatchNot($col, $op, $expression);
default:
throw new ProgrammingError(
'There is no such filter sign: %s',
$op
);
}
}
/**
* Or FilterOperator factory
*
* @param Filter $filter,... Unlimited optional list of Filters
*
* @return FilterOr
*/
public static function matchAny()
{
$args = func_get_args();
if (count($args) === 1 && is_array($args[0])) {
$args = $args[0];
}
return new FilterOr($args);
}
/**
* Or FilterOperator factory
*
* @param Filter $filter,... Unlimited optional list of Filters
*
* @return FilterAnd
*/
public static function matchAll()
{
$args = func_get_args();
if (count($args) === 1 && is_array($args[0])) {
$args = $args[0];
}
return new FilterAnd($args);
}
/**
* FilterNot factory, negates the given filter
*
* @param Filter $filter Filter to be negated
*
* @return FilterNot
*/
public static function not()
{
$args = func_get_args();
if (count($args) === 1) {
if (is_array($args[0])) {
$args = $args[0];
}
}
if (count($args) > 1) {
return new FilterNot(array(new FilterAnd($args)));
} else {
return new FilterNot($args);
}
}
public static function chain($operator, $filters = array())
{
switch ($operator) {
case 'AND':
return self::matchAll($filters);
case 'OR':
return self::matchAny($filters);
case 'NOT':
return self::not($filters);
}
throw new ProgrammingError(
'"%s" is not a valid filter chain operator',
$operator
);
}
/**
* Create filter from queryString
*
* This is still pretty basic, need improvement
*
* @return static
*/
public static function fromQueryString($query)
{
return FilterQueryString::parse($query);
}
}
|
