Del\Filter\Filter\PaginationFilter

Complexity

Total Complexity

14

Size/Duplication

Total Lines	92
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	0

Test Coverage

Coverage

100%

Importance

Changes

0

7 Methods

Rating	Name	Duplication	Size	Complexity
A	filter()	0	19	4
A	getResults()	0	11	2
A	handleRow()	0	10	4
A	getPage()	0	4	1
A	setPage()	0	5	1
A	getNumPerPage()	0	4	1
A	setNumPerPage()	0	5	1

<?php

namespace Del\Filter\Filter;

use ArrayIterator;
use LogicException;

class PaginationFilter implements FilterInterface
{
    /** @var int $page */
    private $page;

    /** @var int $numPerPage */
    private $numPerPage;

    /**
     * @param ArrayIterator $collection
     * @return ArrayIterator
     */
    public function filter(ArrayIterator $collection): ArrayIterator
    {
        // If pagination wasnt set, dont use it!
        if (!$this->page || !$this->numPerPage) {
            return $collection;
        }

        $totalRecords = $collection->count();
        $resultsOffset = ($this->page * $this->numPerPage) - $this->numPerPage;
        $resultsEndOffset = $resultsOffset + $this->numPerPage;

        if ($resultsOffset > $totalRecords) {
            throw new LogicException('There aren\'t that many pages for this result set.');
        }

        $results = $this->getResults($collection, $totalRecords, $resultsOffset, $resultsEndOffset);

        return $results;
    }

    private function getResults(ArrayIterator $collection, int $totalRecords, int $resultsOffset, int $resultsEndOffset)
    {
        $results = new ArrayIterator();

        $collection->rewind();

        for ($x = 0; $x < $totalRecords; $x ++) {
            $this->handleRow($x, $resultsOffset, $resultsEndOffset, $collection, $results);
        }
        return $results;
    }

    private function handleRow(int $x, int $resultsOffset, $resultsEndOffset, ArrayIterator $collection, ArrayIterator $results)
    {
        if ($collection->valid()) {
            $row = $collection->current();
            if ($x >= $resultsOffset && $x < $resultsEndOffset) {
                $results->append($row);
            }
            $collection->next();
        }
    }


    /**
     * @return int
     */
    public function getPage(): int
    {
        return $this->page;
    }

    /**
     * @param int $page
     * @return PaginationFilter
     */
    public function setPage(int $page): PaginationFilter
    {
        $this->page = $page;
        return $this;
    }

    /**
     * @return int
     */
    public function getNumPerPage(): int
    {
        return $this->numPerPage;
    }

    /**
     * @param int $numPerPage
     * @return PaginationFilter
     */
    public function setNumPerPage(int $numPerPage): PaginationFilter
    {
        $this->numPerPage = $numPerPage;
        return $this;
    }
}