unsatisfiableness

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<?php

namespace Coinbase\Wallet\Resource;

class ResourceCollection implements \IteratorAggregate, \Countable, \ArrayAccess
{
    /** @var string */
    private $previousUri;

/** @var string */
    private $nextUri;

/** @var Resource[] */
    private $resources = [];

public function __construct($previousUri = null, $nextUri = null)
    {
        $this->previousUri = $previousUri;
        $this->nextUri = $nextUri;
    }

public function getFirstId()
    {
        if ($this->resources) {
            $lastResource = reset($this->resources);

return $lastResource->getId();
        }
    }

public function getLastId()
    {
        if ($this->resources) {
            $lastResource = end($this->resources);

return $lastResource->getId();
        }
    }

public function getPreviousUri()
    {
        return $this->previousUri;
    }

public function getNextUri()
    {
        return $this->nextUri;
    }

public function hasPreviousPage()
    {
        return (Boolean) $this->previousUri;
    }

public function hasNextPage()
    {
        return (Boolean) $this->nextUri;
    }

public function mergePreviousPage(ResourceCollection $previousPage)
    {
        $resources = array_reverse($previousPage->all());
        foreach ($resources as $resource) {
            array_unshift($this->resources, $resource);
        }

$this->previousUri = $previousPage->getPreviousUri();
    }

public function mergeNextPage(ResourceCollection $nextPage)
    {
        foreach ($nextPage as $resource) {
            $this->add($resource);
        }

$this->nextUri = $nextPage->getNextUri();
    }

public function all()
    {
        return $this->resources;
    }

public function set($index, Resource $resource)
    {
        $this->resources[$index] = $resource;
    }

public function add(Resource $resource)
    {
        $this->resources[] = $resource;
    }

public function get($index)
    {
        if (isset($this->resources[$index])) {
            return $this->resources[$index];
        }
    }

public function has($index)
    {
        return isset($this->resources[$index]);
    }

public function remove($index)
    {
        unset($this->resources[$index]);
    }

public function getIterator()
    {
        return new \ArrayIterator($this->resources);
    }

public function offsetExists($offset)
    {
        return $this->has($offset);
    }

public function offsetGet($offset)
    {
        return $this->get($offset);
    }

public function offsetSet($offset, $value)
    {
        if (null === $offset) {
            $this->add($value);
        } else {
            $this->set($offset, $value);
        }
    }

public function offsetUnset($offset)
    {
        $this->remove($offset);
    }

public function count()
    {
        return count($this->resources);
    }
}