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Avoiding double lookup by replacing ContainsKey with TryGetValue #2

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Avoiding double lookup by replacing ContainsKey with TryGetValue #2

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19 changes: 6 additions & 13 deletions src/DotNet.MultiMap/MultiMapHashSet.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -96,14 +96,13 @@ public MultiMapHashSet(IEnumerable<KeyValuePair<TKey, HashSet<TValue>>> collecti
/// <returns>true if the value has been map to the specified key element; otherwise, false.</returns>
public bool TryToAddMapping(TKey key, TValue val)
{
if (ContainsKey(key))
if (TryGetValue(key, out var set))
{
var set = this[key];
return set.Add(val);
}
var tmp = new HashSet<TValue>();
var tmp = new HashSet<TValue> { val };
Add(key, tmp);
return tmp.Add(val);
return true;
}

/// <summary>
Expand All @@ -115,9 +114,8 @@ public bool TryToAddMapping(TKey key, TValue val)
public bool TryToRemoveMapping(TKey key, TValue val)
{
bool result = false;
if (ContainsKey(key))
if (TryGetValue(key, out var set))
{
var set = this[key];
result = set.Remove(val);
if (set.Count == 0)
{
Expand All @@ -135,13 +133,8 @@ public bool TryToRemoveMapping(TKey key, TValue val)
/// <returns>the number of links (duplicates).</returns>
public int ContainsMapping(TKey key, TValue val)
{
if (ContainsKey(key))
{
var set = this[key];
if (set.Contains(val))
{
return 1;
}
if (TryGetValue(key, out var set) && set.Contains(val)) {
return 1;
}
return 0;
}
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15 changes: 5 additions & 10 deletions src/DotNet.MultiMap/MultiMapList.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -99,16 +99,14 @@ public MultiMapList(IEnumerable<KeyValuePair<TKey, List<TValue>>> collection, IE
/// <returns>true if the value has been map to the specified key element; otherwise, false.</returns>
public bool TryToAddMapping(TKey key, TValue val)
{
if (ContainsKey(key))
if (TryGetValue(key, out var set))
{
var set = this[key];
set.Add(val);
}
else
{
var tmp = new List<TValue>();
var tmp = new List<TValue> { val };
Add(key, tmp);
tmp.Add(val);
}
return true;
}
Expand All @@ -122,12 +120,10 @@ public bool TryToAddMapping(TKey key, TValue val)
public bool TryToRemoveMapping(TKey key, TValue val)
{
bool result = false;
if (ContainsKey(key))
if (TryGetValue(key, out var set))
{
var set = this[key];
result = set.Remove(val);
if (set.Count == 0)
{
if (set.Count == 0) {
Remove(key);
}
}
Expand All @@ -142,9 +138,8 @@ public bool TryToRemoveMapping(TKey key, TValue val)
/// <returns>the number of links (duplicates).</returns>
public int ContainsMapping(TKey key, TValue val)
{
if (ContainsKey(key))
if (TryGetValue(key, out var set))
{
var set = this[key];
return set.Count((v) => v.Equals(val));
}
return 0;
Expand Down