69 lines
2.7 KiB
C#
69 lines
2.7 KiB
C#
using System;
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using System.Linq;
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using System.Collections.Generic;
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using System.Net.Http;
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using System.Threading;
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using System.Threading.Tasks;
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namespace LeanCloud.Storage.Internal {
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public class AVQueryController {
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public Task<IEnumerable<IObjectState>> FindAsync<T>(AVQuery<T> query, AVUser user,
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CancellationToken cancellationToken) where T : AVObject {
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string sessionToken = user != null ? user.SessionToken : null;
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return FindAsync(query.Path, query.BuildParameters(), sessionToken, cancellationToken).OnSuccess(t => {
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var items = t.Result["results"] as IList<object>;
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return (from item in items
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select AVObjectCoder.Instance.Decode(item as IDictionary<string, object>, AVDecoder.Instance));
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});
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}
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public Task<int> CountAsync<T>(AVQuery<T> query,
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AVUser user,
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CancellationToken cancellationToken) where T : AVObject {
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string sessionToken = user != null ? user.SessionToken : null;
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var parameters = query.BuildParameters();
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parameters["limit"] = 0;
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parameters["count"] = 1;
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return FindAsync(query.Path, parameters, sessionToken, cancellationToken).OnSuccess(t => {
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return Convert.ToInt32(t.Result["count"]);
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});
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}
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public Task<IObjectState> FirstAsync<T>(AVQuery<T> query,
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AVUser user,
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CancellationToken cancellationToken) where T : AVObject {
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string sessionToken = user?.SessionToken;
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var parameters = query.BuildParameters();
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parameters["limit"] = 1;
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return FindAsync(query.Path, parameters, sessionToken, cancellationToken).OnSuccess(t => {
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var items = t.Result["results"] as IList<object>;
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var item = items.FirstOrDefault() as IDictionary<string, object>;
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// Not found. Return empty state.
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if (item == null) {
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return (IObjectState)null;
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}
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return AVObjectCoder.Instance.Decode(item, AVDecoder.Instance);
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});
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}
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private Task<IDictionary<string, object>> FindAsync(string path,
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IDictionary<string, object> parameters,
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string sessionToken,
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CancellationToken cancellationToken) {
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var command = new AVCommand {
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Path = $"{path}?{AVClient.BuildQueryString(parameters)}",
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Method = HttpMethod.Get
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};
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return AVPlugins.Instance.CommandRunner.RunCommandAsync<IDictionary<string, object>>(command, cancellationToken: cancellationToken).OnSuccess(t => {
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return t.Result.Item2;
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});
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}
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}
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}
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