/// <summary>
/// Adds the specified key.
/// </summary>
/// <param name="key">The key to add.</param>
/// <param name="value">The value to add.</param>
/// <param name="keyOnlyComparer">The key comparer.</param>
/// <param name="valueComparer">The value comparer.</param>
/// <param name="behavior">The intended behavior for certain cases that may come up during the operation.</param>
/// <param name="result">A description of the effect was on adding an element to this <see cref="HashBucket"/>.</param>
/// <returns>A new <see cref="HashBucket"/> that contains the added value and any values already held by this <see cref="HashBucket"/>.</returns>
internal HashBucket Add(TKey key, TValue value, IEqualityComparer <KeyValuePair <TKey, TValue> > keyOnlyComparer, IEqualityComparer <TValue> valueComparer, KeyCollisionBehavior behavior, out OperationResult result)
{
var kv = new KeyValuePair <TKey, TValue>(key, value);
if (this.IsEmpty)
{
result = OperationResult.SizeChanged;
return(new HashBucket(kv));
}
if (keyOnlyComparer.Equals(kv, _firstValue))
{
switch (behavior)
{
case KeyCollisionBehavior.SetValue:
result = OperationResult.AppliedWithoutSizeChange;
return(new HashBucket(kv, _additionalElements));
case KeyCollisionBehavior.Skip:
result = OperationResult.NoChangeRequired;
return(this);
case KeyCollisionBehavior.ThrowIfValueDifferent:
if (!valueComparer.Equals(_firstValue.Value, value))
{
throw new ArgumentException(SR.Format(SR.DuplicateKey, key));
}
result = OperationResult.NoChangeRequired;
return(this);
case KeyCollisionBehavior.ThrowAlways:
throw new ArgumentException(SR.Format(SR.DuplicateKey, key));
default:
throw new InvalidOperationException(); // unreachable
}
}
int keyCollisionIndex = _additionalElements.IndexOf(kv, keyOnlyComparer);
if (keyCollisionIndex < 0)
{
result = OperationResult.SizeChanged;
return(new HashBucket(_firstValue, _additionalElements.Add(kv)));
}
else
{
switch (behavior)
{
case KeyCollisionBehavior.SetValue:
result = OperationResult.AppliedWithoutSizeChange;
return(new HashBucket(_firstValue, _additionalElements.ReplaceAt(keyCollisionIndex, kv)));
case KeyCollisionBehavior.Skip:
result = OperationResult.NoChangeRequired;
return(this);
case KeyCollisionBehavior.ThrowIfValueDifferent:
ref readonly var existingEntry = ref _additionalElements.ItemRef(keyCollisionIndex);
/// <summary>
/// Adds the specified value.
/// </summary>
/// <param name="value">The value.</param>
/// <param name="valueComparer">The value comparer.</param>
/// <param name="result">A description of the effect was on adding an element to this <see cref="HashBucket"/>.</param>
/// <returns>A new <see cref="HashBucket"/> that contains the added value and any values already held by this <see cref="HashBucket"/>.</returns>
internal HashBucket Add(T value, IEqualityComparer <T> valueComparer, out OperationResult result)
{
if (this.IsEmpty)
{
result = OperationResult.SizeChanged;
return(new HashBucket(value));
}
if (valueComparer.Equals(value, _firstValue) || _additionalElements.IndexOf(value, valueComparer) >= 0)
{
result = OperationResult.NoChangeRequired;
return(this);
}
result = OperationResult.SizeChanged;
return(new HashBucket(_firstValue, _additionalElements.Add(value)));
}
