/// <summary>Remove an entity from the index</summary>
/// <param name="trans">Transaction to use</param>
/// <param name="id">Id of the entity that has been deleted</param>
/// <param name="value">Previous value of the entity in the index</param>
public async Task <bool> RemoveAsync([NotNull] IFdbTransaction trans, long id, TValue value)
{
if (trans == null)
{
throw new ArgumentNullException(nameof(trans));
}
var key = this.Location.Keys.Encode(value);
var data = await trans.GetAsync(key).ConfigureAwait(false);
if (data.HasValue)
{
var builder = new CompressedBitmapBuilder(data);
builder.Clear((int)id); //BUGBUG: 64 bit id!
trans.Set(key, builder.ToSlice());
return(true);
}
return(false);
}
/// <summary>Update the indexed values of an entity</summary>
/// <param name="trans">Transaction to use</param>
/// <param name="id">Id of the entity that has changed</param>
/// <param name="newValue">Previous value of this entity in the index</param>
/// <param name="previousValue">New value of this entity in the index</param>
/// <returns>True if a change was performed in the index; otherwise false (if <paramref name="previousValue"/> and <paramref name="newValue"/>)</returns>
/// <remarks>If <paramref name="newValue"/> and <paramref name="previousValue"/> are identical, then nothing will be done. Otherwise, the old index value will be deleted and the new value will be added</remarks>
public async Task <bool> UpdateAsync([NotNull] IFdbTransaction trans, long id, TValue newValue, TValue previousValue)
{
if (trans == null)
{
throw new ArgumentNullException(nameof(trans));
}
if (!this.ValueComparer.Equals(newValue, previousValue))
{
// remove previous value
if (this.IndexNullValues || previousValue != null)
{
var key = this.Location.Keys.Encode(previousValue);
var data = await trans.GetAsync(key).ConfigureAwait(false);
if (data.HasValue)
{
var builder = new CompressedBitmapBuilder(data);
builder.Clear((int)id); //BUGBUG: 64 bit id!
trans.Set(key, builder.ToSlice());
}
}
// add new value
if (this.IndexNullValues || newValue != null)
{
var key = this.Location.Keys.Encode(newValue);
var data = await trans.GetAsync(key).ConfigureAwait(false);
var builder = data.HasValue ? new CompressedBitmapBuilder(data) : CompressedBitmapBuilder.Empty;
builder.Set((int)id); //BUGBUG: 64 bit id!
trans.Set(key, builder.ToSlice());
}
// cannot be both null, so we did at least something)
return(true);
}
return(false);
}
