public virtual IEnumerator <KeyValuePair <AttributeValue, long> > GetEnumerator()
{
try
{
return(MergeEnumerators(_tree.GetEnumerator(), _transitionTree.GetEnumerator()));
}
catch (Exception ex)
{
LoggerManager.Instance.IndexLogger.Error("BPlusIndex", "Index Enumeration Failure: " + ex.ToString());
throw;
}
}
public void TestEnumeration()
{
var options = Options;
options.BTreeOrder = 4;
using (BPlusTree <int, string> data = new BPlusTree <int, string>(options))
{
data.EnableCount();
data.DebugSetOutput(new StringWriter());
data.DebugSetValidateOnCheckpoint(true);
for (int id = 0; id < 10; id++)
{
data.Add(id, id.ToString());
}
using (IEnumerator <KeyValuePair <int, string> > enu = data.GetEnumerator())
{
Assert.IsTrue(enu.MoveNext());
Assert.AreEqual(0, enu.Current.Key);
for (int id = 2; id < 10; id++)
{
Assert.IsTrue(data.Remove(id));
}
for (int id = 6; id < 11; id++)
{
data.Add(id, id.ToString());
}
Assert.IsTrue(enu.MoveNext());
Assert.AreEqual(1, enu.Current.Key);
Assert.IsTrue(enu.MoveNext());
Assert.AreEqual(6, enu.Current.Key);
Assert.IsTrue(enu.MoveNext());
Assert.AreEqual(7, enu.Current.Key);
Assert.IsTrue(data.Remove(8));
Assert.IsTrue(data.Remove(9));
Assert.IsTrue(data.Remove(10));
data.Add(11, 11.ToString());
Assert.IsTrue(enu.MoveNext());
Assert.AreEqual(11, enu.Current.Key);
Assert.IsTrue(false == enu.MoveNext());
}
data.Clear();
}
}
public void ExplicitRangeAddRemove()
{
string test;
using (BPlusTree <int, string> data = Create(Options))
{
data.Add(2, "v2");
data.Add(1, "v1");
int i = 0;
for (; i < 8; i++)
{
data.TryAdd(i, "v" + i);
}
for (i = 16; i >= 8; i--)
{
data.TryAdd(i, "v" + i);
}
data.TryAdd(13, "v" + i);
for (i = 0; i <= 16; i++)
{
if (!data.TryGetValue(i, out test))
{
throw new ApplicationException();
}
Assert.AreEqual("v" + i, test);
}
data.Remove(1);
data.Remove(3);
IEnumerator <KeyValuePair <int, string> > e = data.GetEnumerator();
Assert.IsTrue(e.MoveNext());
Assert.AreEqual(0, e.Current.Key);
data.Add(1, "v1");
Assert.IsTrue(e.MoveNext());
data.Add(3, "v3");
Assert.IsTrue(e.MoveNext());
data.Remove(8);
Assert.IsTrue(e.MoveNext());
e.Dispose();
data.Add(8, "v8");
i = 0;
foreach (KeyValuePair <int, string> pair in data)
{
Assert.AreEqual(pair.Key, i++);
}
for (i = 0; i <= 16; i++)
{
Assert.IsTrue(data.Remove(i) && data.TryAdd(i, "v" + i));
}
for (i = 6; i <= 12; i++)
{
Assert.IsTrue(data.Remove(i));
}
for (i = 6; i <= 12; i++)
{
Assert.IsFalse(data.TryGetValue(i, out test));
Assert.IsNull(test);
}
for (i = 0; i <= 5; i++)
{
Assert.IsTrue(data.TryGetValue(i, out test));
Assert.AreEqual("v" + i, test);
}
for (i = 13; i <= 16; i++)
{
Assert.IsTrue(data.TryGetValue(i, out test));
Assert.AreEqual("v" + i, test);
}
for (i = 0; i <= 16; i++)
{
Assert.AreEqual(i < 6 || i > 12, data.Remove(i));
}
}
}
private static void BasicTest()
{
BPlusTree <double, string> .OptionsV2 options =
new BPlusTree <double, string> .OptionsV2(PrimitiveSerializer.Double, PrimitiveSerializer.String);
options.CalcBTreeOrder(16, 24);
options.CreateFile = CreatePolicy.Always;
options.FileName = System.IO.Path.GetTempFileName();
using (var tree = new BPlusTree <double, string>(options))
{
// Insertion to tree.
// Note: numbers are NOT inserted sorted.
tree.Add(30.1, "30.2");
tree.Add(10.1, "10.2");
tree.Add(20.1, "20.2");
tree.Add(80.1, "80.2");
tree.Add(40.1, "40.2");
tree.Add(60.1, "60.2");
tree.Add(70.1, "70.2");
tree.Add(50.1, "50.2");
// To get first element.
// Since sorted, first element is: 10.1
KeyValuePair <double, string> first_with_Try;
tree.TryGetFirst(out first_with_Try);
// Similar to previous function.
var first = tree.First();
// To get last element.
// Since sorted, last element is: 80.1
KeyValuePair <double, string> last_with_Try;
tree.TryGetLast(out last_with_Try);
// Similar to previous function.
var last = tree.Last();
// Given key get the value.
// Key is valid, region.e., it is available in tree.
// Hence it returns: "50.2"
string value_of_valid_key;
tree.TryGetValue(50.1, out value_of_valid_key);
// Given key get the value.
// Key is invalid, region.e., it is NOT available in tree.
// Hence it returns: null (default value of int)
string value_of_invalid_key;
tree.TryGetValue(55, out value_of_invalid_key);
// The "100" key is not available and no key is available greater than
// that, hence .Current should return default value of key type (0 in this case).
var key_not_available = tree.EnumerateFrom(100).GetEnumerator().Current;
// Runtime error
//var list = tree.ToList();
// Gets an enumerator.
IEnumerator <KeyValuePair <double, string> > enumerator = tree.GetEnumerator();
// Iterating through items with enumerator.
// starting from first item to last.
while (enumerator.MoveNext())
{
var item = enumerator.Current;
}
// Another syntac of iterations, which is automatically
// calling "GetEnumerator" function.
// starting from first item to last.
foreach (var item in tree)
{
}
// Iterates through items starting from given key: 40.1 (inclusively)
// and goes till the last item.
foreach (var item in tree.EnumerateFrom(39.1))
{
}
// Iterates through items starting from given index: 2 (inclusively)
// and goes till the last item.
foreach (var item in tree.EnumerateFrom(tree.ElementAtOrDefault(2).Key))
{
}
// Iterate from an item that is NOT available in collection
// to the item which is neither available.
foreach (var item in tree.EnumerateRange(20.5, 40.9))
{
}
// Gets the item at specific index.
// All return valid values, but the last one which is
// refereing to an index out-of-bound; the return of this
// call is the default value for key and value.
var element_at_0 = tree.ElementAtOrDefault(0);
var element_at_1 = tree.ElementAtOrDefault(1);
var element_at_2 = tree.ElementAtOrDefault(2);
var element_at_3 = tree.ElementAtOrDefault(3);
var element_at_100 = tree.ElementAtOrDefault(100);
using (BPlusTree <double, string> data = new BPlusTree <double, string>(options))
{
bool sT1 = data.TryAdd(1, "a");
bool sF1 = data.TryAdd(1, "a");
data[1] = "did it";
bool sT2 = data.TryUpdate(1, "a");
bool sT3 = data.TryUpdate(1, "c");
bool sT4 = data.TryUpdate(1, "d", "c");
bool sF2 = data.TryUpdate(1, "f", "c");
bool equality1 = "d".Equals(data[1]);
bool sT5 = data.TryUpdate(1, "a", data[1]);
bool equality2 = "a".Equals(data[1]);
bool sF3 = data.TryUpdate(2, "b");
string val;
bool st6 = data.TryRemove(1, out val) && val == "a";
bool sF4 = data.TryRemove(2, out val);
bool notEqual = val.Equals("a");
}
}
}
public IEnumerator <KeyValuePair <string, ContentRecord> > GetEnumerator()
{
return(_index.GetEnumerator());
}
