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<?php
/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
namespace Icinga\Data\Filter;
use Icinga\Exception\ProgrammingError;
use Icinga\Exception\QueryException;
/**
* FilterChain
*
* A FilterChain contains a list ...
*/
abstract class FilterChain extends Filter
{
protected $filters = array();
protected $operatorName;
protected $operatorSymbol;
protected $allowedColumns;
/**
* Set the filters
*
* @param array $filters
*
* @return $this
*/
public function setFilters(array $filters)
{
$this->filters = $filters;
$this->refreshChildIds();
return $this;
}
public function hasId($id)
{
foreach ($this->filters() as $filter) {
if ($filter->hasId($id)) {
return true;
}
}
return parent::hasId($id);
}
public function getById($id)
{
foreach ($this->filters() as $filter) {
if ($filter->hasId($id)) {
return $filter->getById($id);
}
}
return parent::getById($id);
}
public function removeId($id)
{
if ($id === $this->getId()) {
$this->filters = array();
return $this;
}
$remove = null;
foreach ($this->filters as $key => $filter) {
if ($filter->getId() === $id) {
$remove = $key;
} elseif ($filter instanceof FilterChain) {
$filter->removeId($id);
}
}
if ($remove !== null) {
unset($this->filters[$remove]);
$this->filters = array_values($this->filters);
}
$this->refreshChildIds();
return $this;
}
public function replaceById($id, $filter)
{
$found = false;
foreach ($this->filters as $k => $child) {
if ($child->getId() == $id) {
$this->filters[$k] = $filter;
$found = true;
break;
}
if ($child->hasId($id)) {
$child->replaceById($id, $filter);
$found = true;
break;
}
}
if (! $found) {
throw new ProgrammingError('You tried to replace an unexistant child filter');
}
$this->refreshChildIds();
return $this;
}
protected function refreshChildIds()
{
$i = 0;
$id = $this->getId();
foreach ($this->filters as $filter) {
$i++;
$filter->setId($id . '-' . $i);
}
return $this;
}
public function setId($id)
{
return parent::setId($id)->refreshChildIds();
}
public function getOperatorName()
{
return $this->operatorName;
}
public function setOperatorName($name)
{
if ($name !== $this->operatorName) {
return Filter::chain($name, $this->filters);
}
return $this;
}
public function getOperatorSymbol()
{
return $this->operatorSymbol;
}
public function setAllowedFilterColumns(array $columns)
{
$this->allowedColumns = $columns;
return $this;
}
/**
* List and return all column names referenced in this filter
*
* @param array $columns The columns listed so far
*
* @return array
*/
public function listFilteredColumns(array $columns = array())
{
foreach ($this->filters as $filter) {
if ($filter instanceof FilterExpression) {
$column= $filter->getColumn();
if (! in_array($column, $columns, true)) {
$columns[] = $column;
}
} else {
$columns = $filter->listFilteredColumns($columns);
}
}
return $columns;
}
public function toQueryString()
{
$parts = array();
if (empty($this->filters)) {
return '';
}
foreach ($this->filters() as $filter) {
if (! $filter->isEmpty()) {
$parts[] = $filter->toQueryString();
}
}
// TODO: getLevel??
if (strpos($this->getId(), '-')) {
return '(' . implode($this->getOperatorSymbol(), $parts) . ')';
} else {
return implode($this->getOperatorSymbol(), $parts);
}
}
/**
* Get simple string representation
*
* Useful for debugging only
*
* @return string
*/
public function __toString()
{
if (empty($this->filters)) {
return '';
}
$parts = array();
foreach ($this->filters as $filter) {
if ($filter instanceof FilterChain) {
$parts[] = '(' . $filter . ')';
} else {
$parts[] = (string) $filter;
}
}
$op = ' ' . $this->getOperatorSymbol() . ' ';
return implode($op, $parts);
}
public function __construct($filters = array())
{
foreach ($filters as $filter) {
$this->addFilter($filter);
}
}
public function isExpression()
{
return false;
}
public function isChain()
{
return true;
}
public function isEmpty()
{
return empty($this->filters);
}
public function addFilter(Filter $filter)
{
if (! empty($this->allowedColumns)) {
$this->validateFilterColumns($filter);
}
$this->filters[] = $filter;
$filter->setId($this->getId() . '-' . $this->count());
return $this;
}
protected function validateFilterColumns(Filter $filter)
{
if ($filter->isExpression()) {
$valid = false;
foreach ($this->allowedColumns as $column) {
if (is_callable($column)) {
if (call_user_func($column, $filter->getColumn())) {
$valid = true;
break;
}
} elseif ($filter->getColumn() === $column) {
$valid = true;
break;
}
}
if (! $valid) {
throw new QueryException('Invalid filter column provided: %s', $filter->getColumn());
}
} else {
foreach ($filter->filters() as $subFilter) {
$this->validateFilterColumns($subFilter);
}
}
}
public function &filters()
{
return $this->filters;
}
public function count()
{
return count($this->filters);
}
public function __clone()
{
foreach ($this->filters as & $filter) {
$filter = clone $filter;
}
}
}
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