From eb00570991a2b39b005749f7f7c67643bdcaba59 Mon Sep 17 00:00:00 2001
From: "jan.dittberner" <unknown>
Date: Sun, 25 Jan 2009 12:52:33 +0000
Subject: make migrate.changeset.databases PEP-8 clean and add it to the API
 docs

---
 migrate/changeset/databases/postgres.py | 55 +++++++++++++++++++--------------
 1 file changed, 32 insertions(+), 23 deletions(-)

(limited to 'migrate/changeset/databases/postgres.py')

diff --git a/migrate/changeset/databases/postgres.py b/migrate/changeset/databases/postgres.py
index 8c907fd..d1d4cc8 100644
--- a/migrate/changeset/databases/postgres.py
+++ b/migrate/changeset/databases/postgres.py
@@ -1,44 +1,53 @@
+"""
+   `PostgreSQL`_ database specific implementations of changeset classes.
+
+   .. _`PostgreSQL`: http://www.postgresql.org/
+"""
 from migrate.changeset import ansisql
 from sqlalchemy.databases import postgres as sa_base
 #import sqlalchemy as sa
 
+
 PGSchemaGenerator = sa_base.PGSchemaGenerator
 
+
 class PGSchemaGeneratorMixin(object):
-    def _do_quote_table_identifier(self, identifier):
-        return identifier
-    def _do_quote_column_identifier(self, identifier):
-        return '"%s"'%identifier
+    """Common code used by the PostgreSQL specific classes."""
 
-class PGColumnGenerator(PGSchemaGenerator,ansisql.ANSIColumnGenerator, PGSchemaGeneratorMixin):
     def _do_quote_table_identifier(self, identifier):
         return identifier
+
     def _do_quote_column_identifier(self, identifier):
         return '"%s"'%identifier
 
+
+class PGColumnGenerator(PGSchemaGenerator, ansisql.ANSIColumnGenerator,
+                        PGSchemaGeneratorMixin):
+    """PostgreSQL column generator implementation."""
+    pass
+
+
 class PGColumnDropper(ansisql.ANSIColumnDropper, PGSchemaGeneratorMixin):
-    def _do_quote_table_identifier(self, identifier):
-        return identifier
-    def _do_quote_column_identifier(self, identifier):
-        return '"%s"'%identifier
+    """PostgreSQL column dropper implementation."""
+    pass
+
 
 class PGSchemaChanger(ansisql.ANSISchemaChanger, PGSchemaGeneratorMixin):
-    def _do_quote_table_identifier(self, identifier):
-        return identifier
-    def _do_quote_column_identifier(self, identifier):
-        return '"%s"'%identifier
+    """PostgreSQL schema changer implementation."""
+    pass
 
-class PGConstraintGenerator(ansisql.ANSIConstraintGenerator, PGSchemaGeneratorMixin):
-    def _do_quote_table_identifier(self, identifier):
-        return identifier
-    def _do_quote_column_identifier(self, identifier):
-        return '"%s"'%identifier
 
-class PGConstraintDropper(ansisql.ANSIConstraintDropper, PGSchemaGeneratorMixin):
-    def _do_quote_table_identifier(self, identifier):
-        return identifier
-    def _do_quote_column_identifier(self, identifier):
-        return '"%s"'%identifier
+class PGConstraintGenerator(ansisql.ANSIConstraintGenerator,
+                            PGSchemaGeneratorMixin):
+    """PostgreSQL constraint generator implementation."""
+    pass
+
+
+class PGConstraintDropper(ansisql.ANSIConstraintDropper,
+                          PGSchemaGeneratorMixin):
+    """PostgreSQL constaint dropper implementation."""
+    pass
+
 
 class PGDialect(ansisql.ANSIDialect):
     columngenerator = PGColumnGenerator
-- 
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