Added a naive import cleaning module that looks for imported class name in code and if not found removes
the import declaration (It's not perfect in removing everything like Eclipse but it cannot harm as it may
only miss a redundant import but can't remove a useful one).
Also, changed java model to support multiple test files for a single java class, test files should be:
c_name.data (first test file)
c_name.1.data (second test file)
c_name.2.data (third test file)
and so on.
diff --git a/java_gen/codegen.py b/java_gen/codegen.py
index f3619d4..bc9b9a0 100644
--- a/java_gen/codegen.py
+++ b/java_gen/codegen.py
@@ -37,6 +37,7 @@
 from loxi_ir import *
 import lang_java
 import test_data
+from import_cleaner import ImportCleaner
 
 import loxi_utils.loxi_utils as loxi_utils
 
@@ -84,6 +85,14 @@
         print "filename: %s" % filename
         with open(filename, "w") as f:
             loxi_utils.render_template(f, template, [self.templates_dir], context, prefix=prefix)
+        
+        try:
+            cleaner = ImportCleaner(filename)
+            cleaner.find_used_imports()
+            cleaner.rewrite_file(filename)
+        except:
+            print 'Cannot clean imports from file %s' % filename
+        
 
     def create_of_const_enums(self):
         for enum in self.java_model.enums:
@@ -126,13 +135,16 @@
                 else:
                     print "Class %s ignored by generate_class" % java_class.name
 
-    def create_unit_test(self, unit_test):
-        if unit_test.has_test_data:
-            self.render_class(clazz=unit_test,
-                    template='unit_test.java', src_dir="src/test/java",
-                    version=unit_test.java_class.version,
-                    test=unit_test, msg=unit_test.java_class,
-                    test_data=unit_test.test_data)
+    def create_unit_test(self, unit_tests):
+        if unit_tests.has_test_data:
+            for i in range(unit_tests.length):
+                unit_test = unit_tests.get_test_unit(i)
+                if unit_test.has_test_data:
+                    self.render_class(clazz=unit_test,
+                            template='unit_test.java', src_dir="src/test/java",
+                            version=unit_test.java_class.version,
+                            test=unit_test, msg=unit_test.java_class,
+                            test_data=unit_test.test_data)
 
     def create_of_factories(self):
         factory = self.java_model.of_factory
diff --git a/java_gen/import_cleaner.py b/java_gen/import_cleaner.py
new file mode 100755
index 0000000..83897d4
--- /dev/null
+++ b/java_gen/import_cleaner.py
@@ -0,0 +1,77 @@
+#!/usr/bin/python
+
+import sys
+import re
+
+class ImportLine:
+    def __init__(self, line):
+        self.line = line
+        class_name = None
+        if line[len(line) - 1] == '*':
+            class_name = '*'
+        else:
+            i = 7
+            while i < len(line) - 1:
+                if re.match('\.[A-Z][\..]*$', line[i - 1 : len(line) - 1]):
+                    class_name = line[i : len(line) - 1]
+                    break
+                i = i + 1
+            if class_name is None:
+                class_name = line[line.rfind('.') + 1 : len(line) - 1]
+        self.class_name = class_name
+
+
+class ImportCleaner:
+    def __init__(self, path):
+        f = open(path)
+        self.imp_lines = []
+        self.code_lines = []
+        self.imports_first_line = -1
+        i = 0
+        for line in f:
+            if len(line) > 6 and re.match('^[ \t]*import ', line):
+                self.imp_lines.append(ImportLine(line.rstrip()))
+                if self.imports_first_line == -1:
+                    self.imports_first_line = i
+            else:
+                self.code_lines.append(line.rstrip())
+            i = i + 1
+        f.close()
+
+    def find_used_imports(self):
+        self.used_imports = []
+        for line in self.code_lines:
+            temp = []
+            for imp in self.imp_lines:
+                if imp.class_name == '*' or line.find(imp.class_name) > -1:
+                    temp.append(imp)
+            for x in temp:
+                self.imp_lines.remove(x)
+                self.used_imports.append(x)
+
+    def rewrite_file(self, path):
+        f = open(path, 'w')
+        imports_written = False
+        for i in range(len(self.code_lines)):
+            if not imports_written and self.imports_first_line == i:
+                # Put all imports
+                for imp in self.used_imports:
+                    f.write(imp.line + '\n')
+                imports_written = True
+            # Put next code line
+            f.write(self.code_lines[i] + '\n')
+        f.close()
+
+def main(argv):
+    if len(argv) != 2:
+        print 'Usage: ImportCleaner <java file>'
+        return
+
+    filename = argv[1]
+    print 'Cleaning imports from file %s' % (filename)
+    cleaner = ImportCleaner(filename)
+    cleaner.find_used_imports()
+    cleaner.rewrite_file(filename)
+
+if __name__ == '__main__':
+    main(sys.argv)
diff --git a/java_gen/java_model.py b/java_gen/java_model.py
index 4ac497f..b93b330 100644
--- a/java_gen/java_model.py
+++ b/java_gen/java_model.py
@@ -200,7 +200,7 @@
             self.parent_interface = parent_interface
         else:
             self.parent_interface = None
-
+            
     def class_info(self):
         if re.match(r'OF.+StatsRequest$', self.name):
             return ("", "OFStatsRequest")
@@ -300,7 +300,7 @@
     @property
     @memoize
     def unit_test(self):
-        return JavaUnitTest(self)
+        return JavaUnitTestSet(self)
 
     @property
     def name(self):
@@ -563,18 +563,58 @@
 ### Unit Test
 #######################################################################
 
-class JavaUnitTest(object):
+class JavaUnitTestSet(object):
     def __init__(self, java_class):
         self.java_class = java_class
-        self.data_file_name = "of{version}/{name}.data".format(version=java_class.version.of_version,
+        first_data_file_name = "of{version}/{name}.data".format(version=java_class.version.of_version,
                                                      name=java_class.c_name[3:])
+        data_file_template = "of{version}/{name}.".format(version=java_class.version.of_version,
+                                                     name=java_class.c_name[3:]) + "{i}.data"
+        test_class_name = self.java_class.name + "Test"
+        self.test_units = []
+        if test_data.exists(first_data_file_name):
+            self.test_units.append(JavaUnitTest(java_class, first_data_file_name, test_class_name))
+        i = 1
+        while test_data.exists(data_file_template.format(i=i)):
+            self.test_units.append(JavaUnitTest(java_class, data_file_template.format(i=i), test_class_name + str(i)))
+            i = i + 1
+        
+    @property
+    def package(self):
+        return self.java_class.package
+
+    @property
+    def has_test_data(self):
+        return len(self.test_units) > 0
+
+    @property
+    def length(self):
+        return len(self.test_units)
+    
+    def get_test_unit(self, i):
+        return self.test_units[i]
+
+
+class JavaUnitTest(object):
+    def __init__(self, java_class, file_name=None, test_class_name=None):
+        self.java_class = java_class
+        if file_name is None:
+            self.data_file_name = "of{version}/{name}.data".format(version=java_class.version.of_version,
+                                                         name=java_class.c_name[3:])
+        else:
+            self.data_file_name = file_name
+        if test_class_name is None:
+            self.test_class_name = self.java_class.name + "Test"
+        else:
+            self.test_class_name = test_class_name
+        
     @property
     def package(self):
         return self.java_class.package
 
     @property
     def name(self):
-        return self.java_class.name + "Test"
+        return self.test_class_name
 
     @property
     def has_test_data(self):