54 lines
1.6 KiB
C#
54 lines
1.6 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Linq;
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using LeanCloud.Utilities;
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namespace LeanCloud.Storage.Internal {
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public class AVAddOperation : IAVFieldOperation {
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private ReadOnlyCollection<object> objects;
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public AVAddOperation(IEnumerable<object> objects) {
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this.objects = new ReadOnlyCollection<object>(objects.ToList());
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}
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public object Encode() {
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return new Dictionary<string, object> {
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{"__op", "Add"},
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{"objects", PointerOrLocalIdEncoder.Instance.Encode(objects)}
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};
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}
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public IAVFieldOperation MergeWithPrevious(IAVFieldOperation previous) {
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if (previous == null) {
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return this;
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}
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if (previous is AVDeleteOperation) {
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return new AVSetOperation(objects.ToList());
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}
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if (previous is AVSetOperation) {
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var setOp = (AVSetOperation)previous;
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var oldList = Conversion.To<IList<object>>(setOp.Value);
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return new AVSetOperation(oldList.Concat(objects).ToList());
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}
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if (previous is AVAddOperation) {
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return new AVAddOperation(((AVAddOperation)previous).Objects.Concat(objects));
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}
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throw new InvalidOperationException("Operation is invalid after previous operation.");
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}
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public object Apply(object oldValue, string key) {
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if (oldValue == null) {
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return objects.ToList();
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}
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var oldList = Conversion.To<IList<object>>(oldValue);
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return oldList.Concat(objects).ToList();
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}
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public IEnumerable<object> Objects {
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get {
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return objects;
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}
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}
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}
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}
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