refactor

Author: taylorotwell

Diff for: src/Illuminate/Database/Schema/Blueprint.php

@@ -3,9 +3,11 @@
 namespace Illuminate\Database\Schema;
 
 use Closure;
+use BadMethodCallException;
 use Illuminate\Support\Fluent;
 use Illuminate\Database\Connection;
 use Illuminate\Support\Traits\Macroable;
+use Illuminate\Database\SQLiteConnection;
 use Illuminate\Database\Schema\Grammars\Grammar;
 
 class Blueprint
@@ -100,22 +102,11 @@ public function toSql(Connection $connection, Grammar $grammar)
 
         $statements = [];
 
-        if ($connection instanceof \Illuminate\Database\SQLiteConnection) {
-            $badDDLCount = collect($this->commands)
-                ->filter(function($item, $key) {
-                    return in_array($item->name, [ 'dropColumn', 'renameColumn' ]);
-                })
-                ->count();
-
-            if ($badDDLCount > 1) {
-                throw new \BadMethodCallException("Multiple calls to dropColumn/renameColumn in a single table modification are not supported.");
-            }
-        }
-
-
         // Each type of command has a corresponding compiler function on the schema
         // grammar which is used to build the necessary SQL statements to build
         // the blueprint element, so we'll just call that compilers function.
+        $this->ensureCommandsAreValid($connection);
+
         foreach ($this->commands as $command) {
             $method = 'compile'.ucfirst($command->name);
 
@@ -129,6 +120,35 @@ public function toSql(Connection $connection, Grammar $grammar)
         return $statements;
     }
 
+    /**
+     * Ensure the commands on the blueprint are valid for the connection type.
+     *
+     * @param  \Illuminate\Database\Connection  $connection
+     * @return void
+     */
+    protected function ensureCommandsAreValid(Connection $connection)
+    {
+        if ($connection instanceof SQLiteConnection &&
+            $this->commandsNamed(['dropColumn', 'renameColumn'])->count() > 1) {
+            throw new BadMethodCallException(
+                "SQLite doesn't support multiple calls to dropColumn / renameColumn in a single modification."
+            );
+        }
+    }
+
+    /**
+     * Get all of the commands matching the given names.
+     *
+     * @param  array  $names
+     * @return \Illuminate\Support\Collection
+     */
+    protected function commandsNamed(array $names)
+    {
+        return collect($this->commands)->filter(function ($command) use ($names) {
+            return in_array($command->name, $names);
+        });
+    }
+
     /**
      * Add the commands that are implied by the blueprint's state.
      *