initial checkin of VersionManager

diff --git a/sfa/rspecs/version_manager.py b/sfa/rspecs/version_manager.py
new file mode 100644 (file)
index 0000000..511ede0
--- /dev/null
+++ b/sfa/rspecs/version_manager.py
@@ -0,0 +1,42 @@
+import os
+
+class VersionManager:
+    
+    def __init__(self):
+        self.versions = []
+        self.load_versions()
+
+    def load_versions(self):
+        path = os.path.dirname(os.path.abspath( __file__ ))
+        versions_path = path + os.sep + 'versions'
+        versions_module_path = 'sfa.rspecs.versions'
+        valid_module = lambda x: os.path.isfile(os.sep.join([versions_path, x])) \
+                        and not x.endswith('.pyc') and x not in ['__init__.py']
+        files = [f for f in os.listdir(versions_path) if valid_module(f)]
+        for filename in files:
+            basename = filename.split('.')[0]
+            module_path = versions_module_path +'.'+basename
+            module = __import__(module_path, fromlist=module_path)
+            for attr_name in dir(module):
+                attr = getattr(module, attr_name)
+                if hasattr(attr, 'version'):
+                    self.versions.append(attr)
+
+    def get_version(self, format, version_num=None, type=None):
+        retval = None
+        for version in self.versions:
+            if format is None or format.lower() == version.format.lower():
+                if version_num is None or version_num == version.version:
+                    if type is None or type.lower() == version.type.lower():
+                        retval = version
+        if not retval:
+            raise Exception, "No such version format: %s version: %s type:%s "% (format, version_num, type)
+        return retval    
+        
+
+if __name__ == '__main__':
+    v = VersionManager()
+    print v.versions
+    print v.get_version('sfa') 
+    
+