--- /dev/null
+<?php
+/*
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the MIT license. For more information, see
+ * <http://www.doctrine-project.org>.
+ */
+
+namespace Doctrine\DBAL\Schema\Synchronizer;
+
+use Doctrine\DBAL\Schema\Schema;
+
+/**
+ * The synchronizer knows how to synchronize a schema with the configured
+ * database.
+ *
+ * @author Benjamin Eberlei <kontakt@beberlei.de>
+ */
+interface SchemaSynchronizer
+{
+ /**
+ * Get the SQL statements that can be executed to create the schema.
+ *
+ * @param Schema $createSchema
+ * @return array
+ */
+ function getCreateSchema(Schema $createSchema);
+
+ /**
+ * Get the SQL Statements to update given schema with the underlying db.
+ *
+ * @param Schema $toSchema
+ * @param bool $noDrops
+ * @return array
+ */
+ function getUpdateSchema(Schema $toSchema, $noDrops = false);
+
+ /**
+ * Get the SQL Statements to drop the given schema from underlying db.
+ *
+ * @param Schema $dropSchema
+ * @return array
+ */
+ function getDropSchema(Schema $dropSchema);
+
+ /**
+ * Get the SQL statements to drop all schema assets from underlying db.
+ *
+ * @return array
+ */
+ function getDropAllSchema();
+
+ /**
+ * Create the Schema
+ *
+ * @param Schema $createSchema
+ * @return void
+ */
+ function createSchema(Schema $createSchema);
+
+ /**
+ * Update the Schema to new schema version.
+ *
+ * @param Schema $toSchema
+ * @param bool $noDrops
+ * @return void
+ */
+ function updateSchema(Schema $toSchema, $noDrops = false);
+
+ /**
+ * Drop the given database schema from the underlying db.
+ *
+ * @param Schema $dropSchema
+ * @return void
+ */
+ function dropSchema(Schema $dropSchema);
+
+ /**
+ * Drop all assets from the underyling db.
+ *
+ * @return void
+ */
+ function dropAllSchema();
+}
+