/**
* Construct airportTree, cityTree, and countryTree
* REQUIREMENT:
* 1. The list of airports should be constructed first
*/
public void constructAirportTrees()
{
// if error occured when loading the airports
// skip this step
if (_currentState == State.ERROR) return;
// initialize the fields
airportTree = new PatriciaTrie<AirportObject.Airport>();
cityTree = new PatriciaTrie<AirportObject.Airport>();
countryTree = new PatriciaTrie<AirportObject.Airport>();
for (int i = 0; i < airports.Count; i++)
{
AirportObject.Airport a = airports[i];
// skip it the airport name is null
if (a.name == null) continue;
// insert airport name, city, and country to each tree
airportTree.Add(a.name.ToLower(), a);
cityTree.Add(a.city.ToLower(), a);
countryTree.Add(a.country.ToLower(), a);
}
// set the final state
currentState = State.READY;
}
public void TestPrefix()
{
var trie = new PatriciaTrie <string>();
var tokyoPlaces = new string[] {
"Hachiōji",
"Tachikawa",
"Musashino",
"Mitaka",
"Ōme",
"Fuchū",
"Akishima",
"Chōfu",
"Machida",
"Koganei",
"Kodaira",
"Hino",
"Higashimurayama",
"Kokubunji",
"Kunitachi",
"Fussa",
"Komae",
"Higashiyamato",
"Kiyose",
"Higashikurume",
"Musashimurayama",
"Tama",
"Inagi",
"Hamura",
"Akiruno",
"Nishitōkyō"
};
foreach (var place in tokyoPlaces)
{
trie.Add(place, place);
}
// Prefixes of Kodaira
trie.ContainsKeyPrefix("K").IsTrue();
trie.ContainsKeyPrefix("Ko").IsTrue();
trie.ContainsKeyPrefix("Kod").IsTrue();
trie.ContainsKeyPrefix("Koda").IsTrue();
trie.ContainsKeyPrefix("Kodai").IsTrue();
trie.ContainsKeyPrefix("Kodair").IsTrue();
trie.ContainsKeyPrefix("Kodaira").IsTrue();
trie.ContainsKeyPrefix("Kodaira ").IsFalse();
trie.ContainsKeyPrefix("Kodaira ").IsFalse();
trie["Kodaira"].IsNotNull();
// Prefixes of Fussa
trie.ContainsKeyPrefix("fu").IsFalse();
trie.ContainsKeyPrefix("Fu").IsTrue();
trie.ContainsKeyPrefix("Fus").IsTrue();
}
public void TestTextScan()
{
var trie = new PatriciaTrie <string>();
var terms = new string[] {
"お寿司", "sushi",
"美味しい", "tasty",
"日本", "japan",
"だと思います", "i think",
"料理", "food",
"日本料理", "japanese food",
"一番", "first and foremost",
};
for (var i = 0; i < terms.Length; i += 2)
{
trie.Add(terms[i], terms[i + 1]);
}
var text = "日本料理の中で、一番美味しいのはお寿司だと思います。すぐ日本に帰りたいです。";
var builder = new StringBuilder();
var startIndex = 0;
while (startIndex < text.Length)
{
int matchLength = 0;
while (trie.ContainsKeyPrefix(text.Substring(startIndex, matchLength + 1)))
{
matchLength++;
}
if (matchLength > 0)
{
var match = text.Substring(startIndex, matchLength);
builder.Append("[");
builder.Append(match);
builder.Append("|");
builder.Append(trie[match]);
builder.Append("]");
startIndex += matchLength;
}
else
{
builder.Append(text[startIndex]);
startIndex++;
}
}
builder.ToString().Is("[日本料理|japanese food]の中で、[一番|first and foremost][美味しい|tasty]のは[お寿司|sushi][だと思います|i think]。すぐ[日本|japan]に帰りたいです。");
}
public void TestMultiThreadedTrie()
{
var numThreads = 10;
var perThreadRuns = 50000;
var keySetSize = 1000;
var threads = new List <Task>();
var randoms = Enumerable.Range(0, keySetSize).Select(_ => Guid.NewGuid().ToString()).ToArray();
var trie = new PatriciaTrie <int>();
for (var i = 0; i < keySetSize; i++)
{
trie.Add(randoms[i], i);
}
for (int i = 0; i < numThreads; i++)
{
var thread = Task.Run(() =>
{
var rand = new Random();
for (int run = 0; run < perThreadRuns; run++)
{
int randomIndex = rand.Next(randoms.Length);
var random = randoms[randomIndex];
// Test retrieve
trie[random].Is(randomIndex);
int randomPrefixLength = rand.Next(random.Length);
// Test random prefix length prefix match
trie.ContainsKeyPrefix(random.Substring(0, randomPrefixLength)).IsTrue();
}
});
threads.Add(thread);
}
Task.WaitAll(threads.ToArray());
true.IsTrue();
}
public void TestRandom()
{
// Generate random strings
var randoms = Enumerable.Range(0, 10000).Select(_ => Guid.NewGuid().ToString()).ToArray();
// Insert them
var trie = new PatriciaTrie <string>();
foreach (var random in randoms)
{
trie.Add(random, random);
}
// Get and test them
foreach (var random in randoms)
{
trie[random].Is(random);
trie.ContainsKey(random).IsTrue();
}
}
private static ITrie <int> GetTrieWithData()
{
var randomizer = new Random();
var words = new Dictionary <string, int>
{
{ "арбуз", randomizer.Next() },
{ "аркебуза", randomizer.Next() },
{ "арбузяка", randomizer.Next() },
{ "арбузка", randomizer.Next() },
{ "арбузяшка", randomizer.Next() },
{ "арлекин", randomizer.Next() },
{ "аптека", randomizer.Next() },
};
var trie = new PatriciaTrie <int>();
foreach (var kv in words)
{
trie.Add(kv.Key, kv.Value);
}
return(trie);
}