Youshido\GraphQL\Relay\Connection\Connection

Complexity

Total Complexity

12

Size/Duplication

Total Lines	122
Duplicated Lines	0 %

Coupling/Cohesion

Components	0
Dependencies	4

Test Coverage

Coverage

100%

Importance

Changes

0

6 Methods

Rating	Name	Duplication	Size	Complexity
A	connectionArgs()	0	4	1
A	forwardArgs()	0	7	1
A	backwardArgs()	0	7	1
B	edgeDefinition()	0	25	3
B	connectionDefinition()	0	28	5
B	getPageInfoType()	0	25	1

<?php
/**
 * Date: 10.05.16
 *
 * @author Portey Vasil <portey@gmail.com>
 */

namespace Youshido\GraphQL\Relay\Connection;


use Youshido\GraphQL\Type\AbstractType;
use Youshido\GraphQL\Type\ListType\ListType;
use Youshido\GraphQL\Type\NonNullType;
use Youshido\GraphQL\Type\Object\ObjectType;
use Youshido\GraphQL\Type\TypeMap;

class Connection
{

    public static function connectionArgs()
    {
        return array_merge(self::forwardArgs(), self::backwardArgs());
    }

    public static function forwardArgs()
    {
        return [
            'after' => ['type' => TypeMap::TYPE_STRING],
            'first' => ['type' => TypeMap::TYPE_INT]
        ];
    }

    public static function backwardArgs()
    {
        return [
            'before' => ['type' => TypeMap::TYPE_STRING],
            'last'   => ['type' => TypeMap::TYPE_INT]
        ];
    }

    /**
     * @param AbstractType $type
     * @param null|string  $name
     * @param array        $config
     * @option string  edgeFields
     *
     * @return ObjectType
     */
    public static function edgeDefinition(AbstractType $type, $name = null, $config = [])
    {
        $name       = $name ?: $type->getName();
        $edgeFields = !empty($config['edgeFields']) ? $config['edgeFields'] : [];

        $edgeType = new ObjectType([
            'name'        => $name . 'Edge',
            'description' => 'An edge in a connection.',
            'fields'      => array_merge([
                'node'   => [
                    'type'        => $type,
                    'description' => 'The item at the end of the edge',
                    'resolve'     => function ($value) {
                        return $value['node'];
                    }
                ],
                'cursor' => [
                    'type'        => TypeMap::TYPE_STRING,
                    'description' => 'A cursor for use in pagination'
                ]
            ], $edgeFields)
        ]);

        return $edgeType;
    }

    /**
     * @param AbstractType $type
     * @param null|string  $name
     * @param array        $config
     * @option string  connectionFields
     *
     * @return ObjectType
     */
    public static function connectionDefinition(AbstractType $type, $name = null, $config = [])
    {
        $name             = $name ?: $type->getName();
        $connectionFields = !empty($config['connectionFields']) ? $config['connectionFields'] : [];

        $connectionType = new ObjectType([
            'name'        => $name . 'Connection',
            'description' => 'A connection to a list of items.',
            'fields'      => array_merge([
                'pageInfo' => [
                    'type'        => new NonNullType(self::getPageInfoType()),
                    'description' => 'Information to aid in pagination.',
                    'resolve'     => function ($value) {
                        return isset($value['pageInfo']) ? $value['pageInfo'] : null;
                    }
                ],
                'edges'    => [
                    'type'        => new ListType(self::edgeDefinition($type, $name, $config)),
                    'description' => 'A list of edges.',
                    'resolve'     => function ($value) {
                        return isset($value['edges']) ? $value['edges'] : null;
                    }
                ]
            ], $connectionFields)
        ]);

        return $connectionType;
    }

    public static function getPageInfoType()
    {
        return new ObjectType([
            'name'        => 'PageInfo',
            'description' => 'Information about pagination in a connection.',
            'fields'      => [
                'hasNextPage'     => [
                    'type'        => new NonNullType(TypeMap::TYPE_BOOLEAN),
                    'description' => 'When paginating forwards, are there more items?'
                ],
                'hasPreviousPage' => [
                    'type'        => new NonNullType(TypeMap::TYPE_BOOLEAN),
                    'description' => 'When paginating backwards, are there more items?'
                ],
                'startCursor'     => [
                    'type'        => TypeMap::TYPE_STRING,
                    'description' => 'When paginating backwards, the cursor to continue.'
                ],
                'endCursor'       => [
                    'type'        => TypeMap::TYPE_STRING,
                    'description' => 'When paginating forwards, the cursor to continue.'
                ],
            ]
        ]);
    }

}