csharp-sdk-upm/Storage/Source/Internal/Operation/AVRemoveOperation.cs

69 lines
2.0 KiB
C#

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using LeanCloud.Utilities;
namespace LeanCloud.Storage.Internal
{
public class AVRemoveOperation : IAVFieldOperation
{
private ReadOnlyCollection<object> objects;
public AVRemoveOperation(IEnumerable<object> objects)
{
this.objects = new ReadOnlyCollection<object>(objects.Distinct().ToList());
}
public object Encode()
{
return new Dictionary<string, object> {
{"__op", "Remove"},
{"objects", PointerOrLocalIdEncoder.Instance.Encode(objects)}
};
}
public IAVFieldOperation MergeWithPrevious(IAVFieldOperation previous)
{
if (previous == null)
{
return this;
}
if (previous is AVDeleteOperation)
{
return previous;
}
if (previous is AVSetOperation)
{
var setOp = (AVSetOperation)previous;
var oldList = Conversion.As<IList<object>>(setOp.Value);
return new AVSetOperation(this.Apply(oldList, null));
}
if (previous is AVRemoveOperation)
{
var oldOp = (AVRemoveOperation)previous;
return new AVRemoveOperation(oldOp.Objects.Concat(objects));
}
throw new InvalidOperationException("Operation is invalid after previous operation.");
}
public object Apply(object oldValue, string key)
{
if (oldValue == null)
{
return new List<object>();
}
var oldList = Conversion.As<IList<object>>(oldValue);
return oldList.Except(objects, AVFieldOperations.AVObjectComparer).ToList();
}
public IEnumerable<object> Objects
{
get
{
return objects;
}
}
}
}