Closes #40. Intended usage

 - Inherit `Container` and override `getResourceType` method
 - Inherit `SchemaFactory` and override `createContainer` method
 - Inherit `Encoder` and override `getFactories` method where `$schemaFactory` should return the new schema factory instance

Author: neomerx

src/Encoder/Encoder.php

@@ -20,6 +20,7 @@
 use \Neomerx\JsonApi\Contracts\Document\ErrorInterface;
 use \Neomerx\JsonApi\Contracts\Encoder\EncoderInterface;
 use \Neomerx\JsonApi\Contracts\Schema\ContainerInterface;
+use \Neomerx\JsonApi\Contracts\Schema\SchemaFactoryInterface;
 use \Neomerx\JsonApi\Contracts\Schema\SchemaProviderInterface;
 use \Neomerx\JsonApi\Contracts\Document\DocumentFactoryInterface;
 use \Neomerx\JsonApi\Contracts\Encoder\Parser\DataAnalyzerInterface;
@@ -192,25 +193,42 @@ protected function encodeToJson(array $document)
      * @return Encoder
      */
     public static function instance(array $schemas, EncoderOptions $encodeOptions = null)
+    {
+        /** @var SchemaFactoryInterface $schemaFactory */
+        /** @var DocumentFactoryInterface $documentFactory */
+        /** @var ParserFactoryInterface $parserFactory */
+        /** @var HandlerFactoryInterface $handlerFactory */
+        /** @var ParametersFactoryInterface $parameterFactory */
+        list($schemaFactory, $documentFactory, $parserFactory, $handlerFactory, $parameterFactory) =
+            static::getFactories();
+
+        $container = $schemaFactory->createContainer($schemas);
+
+        return new self(
+            $documentFactory,
+            $parserFactory,
+            $handlerFactory,
+            $parameterFactory,
+            $container,
+            $encodeOptions
+        );
+    }
+
+    /**
+     * @return array [$schemaFactory, $documentFactory, $parserFactory, $handlerFactory, $parameterFactory]
+     */
+    protected static function getFactories()
     {
         /** @noinspection PhpUnnecessaryFullyQualifiedNameInspection */
         $schemaFactory = new \Neomerx\JsonApi\Schema\SchemaFactory();
-        $container     = $schemaFactory->createContainer($schemas);
         /** @noinspection PhpUnnecessaryFullyQualifiedNameInspection */
         $documentFactory = new \Neomerx\JsonApi\Document\DocumentFactory();
         /** @noinspection PhpUnnecessaryFullyQualifiedNameInspection */
-        $encoderFactory = new \Neomerx\JsonApi\Encoder\Factory\EncoderFactory();
+        $parserFactory = $handlerFactory = new \Neomerx\JsonApi\Encoder\Factory\EncoderFactory();
         /** @noinspection PhpUnnecessaryFullyQualifiedNameInspection */
         $parameterFactory = new \Neomerx\JsonApi\Parameters\ParametersFactory();
 
-        return new self(
-            $documentFactory,
-            $encoderFactory,
-            $encoderFactory,
-            $parameterFactory,
-            $container,
-            $encodeOptions
-        );
+        return [$schemaFactory, $documentFactory, $parserFactory, $handlerFactory, $parameterFactory];
     }
 
     /**

src/Schema/Container.php

@@ -88,7 +88,7 @@ public function registerArray(array $schemas)
      */
     public function getSchema($resource)
     {
-        $resourceType = get_class($resource);
+        $resourceType = $this->getResourceType($resource);
 
         if (isset($this->createdProviders[$resourceType])) {
             return $this->createdProviders[$resourceType];
@@ -105,4 +105,14 @@ public function getSchema($resource)
 
         return $schema;
     }
+
+    /**
+     * @param object $resource
+     *
+     * @return string
+     */
+    protected function getResourceType($resource)
+    {
+        return get_class($resource);
+    }
 }