public void processDelMsg(XDocument xdoc, Sender sndr, Message msg)
{
IEnumerable <string> keys = db.Keys();
int numKeys = Convert.ToInt32(getNumberOfKeys(xdoc));
if (numKeys > keys.Count())
{
numKeys = keys.Count() - 1;
}
List <string> keyList = keys.ToList();
for (int i = 0; i < numKeys; i++)
{
string keyToDeleted = keyList.ElementAt(i);
if (db.delete(keyToDeleted))
{
msg.content = "\n\n***************************\n" + keyToDeleted + " record is deleted.\n";
}
else
{
msg.content = "\n*********************\n" + keyToDeleted + " record is not deleted.";
}
Message testMsg = new Message();
testMsg.toUrl = msg.fromUrl;
testMsg.fromUrl = msg.toUrl;
testMsg.content = msg.content;
sndr.sendMessage(testMsg);
}
}
public void performOperations(DBEngine <string, DBElement <string, List <string> > > testDict, DBElement <string, List <string> > value)
{ /*----------Perform operations as per the input given in the XML document--------------*/
if (value.operation == "addition")
{
testDict.insert(value.key, value); //insert the key/value pairs to the main database
string s = "Database after inserting key " + value.key + " is";
printDatabase(testDict, s);
}
if (value.operation == "edit")
{
testDict.saveValue(value.key, value); //edit the value for the given key
string s = "Database after editing key " + value.key + " is";
printDatabase(testDict, s);
}
if (value.operation == "delete")
{
testDict.delete(value.key); //delete the key/value pair
string s = "Database after deleting key " + value.key + " is";
printDatabase(testDict, s);
}
if (value.operation == "persist database")
{
PersistEngine <string, DBElement <string, List <string> > > persist = new PersistEngine <string, DBElement <string, List <string> > >(testDict);
var keys = testDict.Keys();
persist.persistToXMLListPayload(keys);
printDatabase(testDict, "Persisted database is:");
}
if (value.operation == "Query value")
{
DBElement <string, List <string> > valueOfKey = testDict.getValueOfKey(value.key);
printQuery("Querying the database for value of key " + value.key + " is");
Console.WriteLine("\n\nThe value of the Key {0} is:\n", value.key);
valueOfKey.showEnumerableElement();
}
if (value.operation == "Query children")
{
QueryEngine <string, DBElement <string, List <string> > > qEngine = new QueryEngine <string, DBElement <string, List <string> > >(testDict);
printQuery("Querying the database for value of key " + value.key + " is");
List <string> children = qEngine.getChildrenOfKey(value.key);
Console.WriteLine("\nThe children of the Key {0} are:\n", value.key);
displayChildren(children);
}
if (value.operation == "Augment database")
{
PersistEngine <string, DBElement <string, List <string> > > persist = new PersistEngine <string, DBElement <string, List <string> > >(testDict);
string fileName = "C:\\Users\\rakeshh91\\Documents\\Rakesh Documents\\Class Materials\\SMA\\Assignments\\Assignment 4 - Implementation\\CommPrototype\\augmentDatabase.xml";
persist.augmentDatabaseFromXMLStringList(testDict, fileName);
printDatabase(testDict, "Database after augmenting is:");
}
}
//----< process delete message request >-----
public string processDeleteMessage(XDocument xdoc)
{
string content = "";
int type = getKeyValueType(xdoc);
if (type == 1)
{
string keyToDeleted = getKey(xdoc);
if (db.delete(keyToDeleted))
{
content = keyToDeleted + " record is deleted.";
}
else
{
content = keyToDeleted + " record is not deleted.";
}
}
return(content);
}
public Action<Message>delete(DBEngine<int, DBElement<int, string>> db)
{
Action<Message> Delete = (msg) =>
{
XDocument doc = XDocument.Parse(msg.content.ToString());
int key = int.Parse(doc.Descendants("Msg").Descendants("Data").Descendants("key").ElementAt(0).Value);
Console.Write("\n\n delete an element which key = {0}", key);
Write("\n\n --- Database before delete ---");
db.showDB();
if (db.delete(key))
{
msg.content = "Delete success";
Console.Write("\n\n --- Database after delete---", key);
db.showDB();
}
else
msg.content = "Delete fail";
Utilities.swapUrls(ref msg);
};
return Delete;
}
/// <summary>
/// Queries the database.
/// </summary>
/// <param name="input">The input.</param>
/// <returns></returns>
public String QueryDatabase(String input)
{
String result = String.Empty;
var dbElement = ParseXml(input);
switch (dbElement.dbOperation)
{
case "Add":
db.insert(dbElement.key, dbElement);
result = "Key " + dbElement.key + " inserted successfully!";
break;
case "Edit":
db.replaceKeyInstance(dbElement.key, dbElement);
result = "Key " + dbElement.key + "'s value modified successfully!";
break;
case "Delete":
if (db.delete(dbElement.key))
{
result = "Key " + dbElement.key + " deleted successfully!";
}
else
{
result = "Key " + dbElement.key + " not found!!";
}
break;
case "SearchChild":
var children = db.searchChildren(dbElement.key);
result = "Children are " + string.Join(", ", children.ToArray());
break;
case "Search":
var value = db.searchValue(dbElement.key);
if (value != null)
{
result = "Key " + dbElement.key + " found!!!!!\n\n";
result += value.showEnumerableElement();
}
else
{
result = "Key " + dbElement.key + " not found!!";
}
break;
case "Persist":
db.toXml();
result = "Database persisted successfully";
break;
case "Restore":
db.restoreDatabase();
result = "Database successfully restored!!";
break;
default: break;
}
string dbView = db.showEnumerableDB();
"\nDB Contents:\n".title();
result += dbView;
return(result);
}
