feat(Types): add request to get type by key

Closes #169

features/request/Type/TypeDelete.feature

@@ -4,3 +4,9 @@ Feature: I want to delete a type
     And i want to delete a "type"
     Then the path should be "types/id?version=1"
     And the method should be "DELETE"
+
+  Scenario: Delete type
+    Given a "type" is identified by key "typeKey" and version 1
+    And i want to delete a "type"
+    Then the path should be "types/key=typeKey?version=1"
+    And the method should be "DELETE"

src/Request/Types/TypeByKeyGetRequest.php

@@ -0,0 +1,88 @@
+<?php
+/**
+ * @author @jayS-de <jens.schulze@commercetools.de>
+ */
+
+namespace Commercetools\Core\Request\Types;
+
+use Commercetools\Core\Client\HttpMethod;
+use Commercetools\Core\Client\HttpRequest;
+use Commercetools\Core\Model\Common\Context;
+use Commercetools\Core\Request\AbstractApiRequest;
+use Commercetools\Core\Model\Type\Type;
+use Commercetools\Core\Request\ExpandTrait;
+use Commercetools\Core\Request\PageTrait;
+use Commercetools\Core\Request\QueryTrait;
+use Commercetools\Core\Request\StagedTrait;
+use Commercetools\Core\Response\ApiResponseInterface;
+use Commercetools\Core\Response\ResourceResponse;
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * @package Commercetools\Core\Request\Types
+ * @method Type mapResponse(ApiResponseInterface $response)
+ */
+class TypeByKeyGetRequest extends AbstractApiRequest
+{
+    protected $resultClass = '\Commercetools\Core\Model\Type\Type';
+
+    use QueryTrait;
+    use StagedTrait;
+    use PageTrait;
+    use ExpandTrait;
+
+    /**
+     * @param string $key
+     * @param Context $context
+     */
+    public function __construct($key, Context $context = null)
+    {
+        parent::__construct(TypesEndpoint::endpoint(), $context);
+        if (!is_null($key)) {
+            $this->where(sprintf('key="%1$s"', $key));
+        }
+        $this->limit(1);
+    }
+
+    /**
+     * @param string $key
+     * @param Context $context
+     * @return static
+     */
+    public static function ofKey($key, Context $context = null)
+    {
+        return new static($key, $context);
+    }
+
+    /**
+     * @return HttpRequest
+     * @internal
+     */
+    public function httpRequest()
+    {
+        return new HttpRequest(HttpMethod::GET, $this->getPath());
+    }
+
+    /**
+     * @param ResponseInterface $response
+     * @return ResourceResponse
+     */
+    public function buildResponse(ResponseInterface $response)
+    {
+        return new ResourceResponse($response, $this, $this->getContext());
+    }
+
+    /**
+     * @param array $result
+     * @param Context $context
+     * @return Type|null
+     */
+    public function mapResult(array $result, Context $context = null)
+    {
+        if (!empty($result['results'])) {
+            $data = current($result['results']);
+            return Type::fromArray($data, $context);
+        }
+        return null;
+    }
+}

src/Request/Types/TypeDeleteByKeyRequest.php

@@ -0,0 +1,43 @@
+<?php
+/**
+ * @author @jayS-de <jens.schulze@commercetools.de>
+ */
+
+namespace Commercetools\Core\Request\Types;
+
+use Commercetools\Core\Model\Common\Context;
+use Commercetools\Core\Request\AbstractDeleteByKeyRequest;
+use Commercetools\Core\Request\AbstractDeleteRequest;
+use Commercetools\Core\Model\Type\Type;
+use Commercetools\Core\Response\ApiResponseInterface;
+
+/**
+ * @package Commercetools\Core\Request\Types
+ * @link https://dev.commercetools.com/http-api-projects-types.html#delete-type-by-key
+ * @method Type mapResponse(ApiResponseInterface $response)
+ */
+class TypeDeleteByKeyRequest extends AbstractDeleteByKeyRequest
+{
+    protected $resultClass = '\Commercetools\Core\Model\Type\Type';
+
+    /**
+     * @param string $id
+     * @param int $version
+     * @param Context $context
+     */
+    public function __construct($id, $version, Context $context = null)
+    {
+        parent::__construct(TypesEndpoint::endpoint(), $id, $version, $context);
+    }
+
+    /**
+     * @param string $key
+     * @param int $version
+     * @param Context $context
+     * @return static
+     */
+    public static function ofKeyAndVersion($key, $version, Context $context = null)
+    {
+        return new static($key, $version, $context);
+    }
+}