def test_delete_item_not_exists_negative(self):
hmap = Hashmap()
with self.assertRaises(KeyError):
hmap.delete(0)
class HashmapViewModel:
MSG_TYPES = {
"insert_msg": "Insert: key is '%s', value is '%s'",
"delete_msg": "Delete: key is '%s'",
"get_msg": "Get: key is '%s', found value is '%s'",
"update_msg": "Update: key is '%s', value is '%s'",
"key_not_exist_msg": "ERROR: key '%s' does not exist",
"key_exist_msg": "ERROR: key '%s' already exists",
}
MAX_MESSAGE_NUMBER = 10
def __init__(self, logger=RealLogger()):
self.logger = logger
self.logger.log("create view")
self.hashmap = Hashmap()
self.messages = []
self.key = ""
self.value = ""
self.operation = HashmapOperation.INSERT
self.set_value_textbox_enabled()
self.set_button_run_disabled()
def validate_text(self):
if self.key and (self.value
or self.value_textbox_state == State.DISABLED):
self.set_button_run_enabled()
else:
self.set_button_run_disabled()
def set_button_run_enabled(self):
self.button_run_state = State.ENABLED
def set_button_run_disabled(self):
self.button_run_state = State.DISABLED
def get_button_run_state(self):
return self.button_run_state.value
def set_value_textbox_enabled(self):
self.value_textbox_state = State.ENABLED
def set_value_textbox_disabled(self):
self.set_value("")
self.value_textbox_state = State.DISABLED
def get_value_textbox_state(self):
return self.value_textbox_state.value
def get_key(self):
return self.key
def set_key(self, key):
self.key = key
self.validate_text()
def get_value(self):
return self.value
def set_value(self, value):
self.value = value
self.validate_text()
def get_message_text(self):
return "\n".join(self.messages)
def update_messages(self, new_message):
self.messages.insert(0, new_message)
if len(self.messages) > self.MAX_MESSAGE_NUMBER:
self.messages = self.messages[:self.MAX_MESSAGE_NUMBER]
def set_operation(self, operation):
self.operation = operation
if operation in [HashmapOperation.DELETE, HashmapOperation.GET]:
self.set_value_textbox_disabled()
self.set_value("")
else:
self.set_value_textbox_enabled()
self.validate_text()
def click_run_button(self):
if self.button_run_state == State.DISABLED:
self.logger.log("button is disabled")
return
if self.operation == HashmapOperation.INSERT:
try:
self.hashmap.insert(self.key, self.value)
self.update_messages(self.MSG_TYPES["insert_msg"] %
(self.key, self.value))
self.logger.log(self.MSG_TYPES["insert_msg"] %
(self.key, self.value))
except KeyError:
self.update_messages(self.MSG_TYPES["key_exist_msg"] %
(self.key))
self.logger.log(self.MSG_TYPES["key_exist_msg"] % (self.key))
elif self.operation == HashmapOperation.DELETE:
try:
self.hashmap.delete(self.key)
self.update_messages(self.MSG_TYPES["delete_msg"] % (self.key))
self.logger.log(self.MSG_TYPES["delete_msg"] % (self.key))
except KeyError:
self.update_messages(self.MSG_TYPES["key_not_exist_msg"] %
(self.key))
self.logger.log(self.MSG_TYPES["key_not_exist_msg"] %
(self.key))
elif self.operation == HashmapOperation.GET:
try:
value = self.hashmap.get(self.key)
self.update_messages(self.MSG_TYPES["get_msg"] %
(self.key, value))
self.logger.log(self.MSG_TYPES["get_msg"] % (self.key, value))
except KeyError:
self.update_messages(self.MSG_TYPES["key_not_exist_msg"] %
(self.key))
self.logger.log(self.MSG_TYPES["key_not_exist_msg"] %
(self.key))
elif self.operation == HashmapOperation.UPDATE:
try:
value = self.hashmap.update(self.key, self.value)
self.update_messages(self.MSG_TYPES["update_msg"] %
(self.key, self.value))
self.logger.log(self.MSG_TYPES["update_msg"] %
(self.key, self.value))
except KeyError:
self.update_messages(self.MSG_TYPES["key_not_exist_msg"] %
(self.key))
self.logger.log(self.MSG_TYPES["key_not_exist_msg"] %
(self.key))