Add SchemaDiff::isEmpty()

Author: morozov

src/Schema/SchemaDiff.php

@@ -6,6 +6,7 @@
 use Doctrine\Deprecations\Deprecation;
 
 use function array_merge;
+use function count;
 
 /**
  * Differences between two schemas.
@@ -179,6 +180,21 @@ public function getDroppedSequences(): array
         return $this->removedSequences;
     }
 
+    /**
+     * Returns whether the diff is empty (contains no changes).
+     */
+    public function isEmpty(): bool
+    {
+        return count($this->newNamespaces) === 0
+            && count($this->removedNamespaces) === 0
+            && count($this->newTables) === 0
+            && count($this->changedTables) === 0
+            && count($this->removedTables) === 0
+            && count($this->newSequences) === 0
+            && count($this->changedSequences) === 0
+            && count($this->removedSequences) === 0;
+    }
+
     /**
      * The to save sql mode ensures that the following things don't happen:
      *

tests/Platforms/AbstractPlatformTestCase.php

@@ -14,6 +14,7 @@
 use Doctrine\DBAL\Schema\Comparator;
 use Doctrine\DBAL\Schema\ForeignKeyConstraint;
 use Doctrine\DBAL\Schema\Index;
+use Doctrine\DBAL\Schema\SchemaDiff;
 use Doctrine\DBAL\Schema\Table;
 use Doctrine\DBAL\Schema\TableDiff;
 use Doctrine\DBAL\Schema\UniqueConstraint;
@@ -1390,6 +1391,14 @@ public function testEmptyTableDiff(): void
         self::assertSame([], $this->platform->getAlterTableSQL($diff));
     }
 
+    public function testEmptySchemaDiff(): void
+    {
+        $diff = new SchemaDiff();
+
+        self::assertTrue($diff->isEmpty());
+        self::assertSame([], $this->platform->getAlterSchemaSQL($diff));
+    }
+
     public function tearDown(): void
     {
         if (! isset($this->backedUpType)) {