public override AbstractEdgeMap <T> Clear()
{
if (IsEmpty)
{
return(this);
}
Antlr4.Runtime.Dfa.SparseEdgeMap <T> result = new Antlr4.Runtime.Dfa.SparseEdgeMap <T>(this, GetMaxSparseSize());
result.values.Clear();
return(result);
}
private SparseEdgeMap(Antlr4.Runtime.Dfa.SparseEdgeMap <T> map, int maxSparseSize)
: base(map.minIndex, map.maxIndex)
{
if (maxSparseSize < map.values.Count)
{
throw new ArgumentException();
}
keys = Arrays.CopyOf(map.keys, maxSparseSize);
values = new List <T>(maxSparseSize);
values.AddRange(map.values);
}
public override AbstractEdgeMap <T> Put(int key, T value)
{
if (key < minIndex || key > maxIndex)
{
return(this);
}
if (value == null)
{
return((Antlr4.Runtime.Dfa.SparseEdgeMap <T>)Remove(key));
}
lock (values)
{
int index = System.Array.BinarySearch(keys, 0, Count, key);
if (index >= 0)
{
// replace existing entry
values[index] = value;
return(this);
}
System.Diagnostics.Debug.Assert(index < 0 && value != null);
int insertIndex = -index - 1;
if (Count < GetMaxSparseSize() && insertIndex == Count)
{
// stay sparse and add new entry
keys[insertIndex] = key;
values.Add(value);
return(this);
}
int desiredSize = Count >= GetMaxSparseSize() ? GetMaxSparseSize() * 2 : GetMaxSparseSize
();
int space = maxIndex - minIndex + 1;
// SparseEdgeMap only uses less memory than ArrayEdgeMap up to half the size of the symbol space
if (desiredSize >= space / 2)
{
ArrayEdgeMap <T> arrayMap = new ArrayEdgeMap <T>(minIndex, maxIndex);
arrayMap = ((ArrayEdgeMap <T>)arrayMap.PutAll(this));
arrayMap.Put(key, value);
return(arrayMap);
}
else
{
Antlr4.Runtime.Dfa.SparseEdgeMap <T> resized = new Antlr4.Runtime.Dfa.SparseEdgeMap
<T>(this, desiredSize);
System.Array.Copy(resized.keys, insertIndex, resized.keys, insertIndex + 1, resized
.keys.Length - insertIndex - 1);
resized.keys[insertIndex] = key;
resized.values.Insert(insertIndex, value);
return(resized);
}
}
}
public override AbstractEdgeMap <T> Remove(int key)
{
lock (this)
{
int index = System.Array.BinarySearch(keys, 0, Count, key);
if (index < 0)
{
return(this);
}
Antlr4.Runtime.Dfa.SparseEdgeMap <T> result = new Antlr4.Runtime.Dfa.SparseEdgeMap <T>(this, MaxSparseSize);
System.Array.Copy(result.keys, index + 1, result.keys, index, Count - index - 1);
result.values.RemoveAt(index);
return(result);
}
}
