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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Threading.Tasks;
using Newtonsoft.Json.Linq;
namespace Xamarin.Forms.Pages
{
public class JsonDataSource : BaseDataSource
{
readonly ObservableCollection<IDataItem> _dataItems = new ObservableCollection<IDataItem>();
Task _currentParseTask;
bool _initialized;
JsonSource _source;
public JsonDataSource()
{
}
internal JsonDataSource(JToken rootToken)
{
ParseJsonToken(rootToken);
}
[TypeConverter(typeof(JsonSourceConverter))]
public JsonSource Source
{
get { return _source; }
set
{
if (_source == value)
return;
_source = value;
_dataItems.Clear();
if (value != null && _initialized)
{
_currentParseTask = ParseJson();
_currentParseTask.ContinueWith(t => { throw t.Exception; }, TaskContinuationOptions.OnlyOnFaulted);
}
}
}
protected override async Task<IList<IDataItem>> GetRawData()
{
if (!_initialized)
{
Task task = _currentParseTask = ParseJson();
await task;
}
else if (_currentParseTask != null && _currentParseTask.IsCompleted == false)
await _currentParseTask;
return _dataItems;
}
protected override object GetValue(string key)
{
IDataItem target = _dataItems.FirstOrDefault(d => d.Name == key);
return target?.Value;
}
protected override bool SetValue(string key, object value)
{
IDataItem target = _dataItems.FirstOrDefault(d => d.Name == key);
if (target == null)
{
_dataItems.Add(new DataItem(key, value));
return true;
}
if (target.Value == value)
return false;
target.Value = value;
return true;
}
object GetValueForJToken(JToken token)
{
switch (token.Type)
{
case JTokenType.Object:
case JTokenType.Array:
return new JsonDataSource(token);
case JTokenType.Constructor:
case JTokenType.Property:
case JTokenType.Comment:
throw new NotImplementedException();
case JTokenType.Integer:
return (int)token;
case JTokenType.Float:
return (float)token;
case JTokenType.Raw:
case JTokenType.String:
return (string)token;
case JTokenType.Boolean:
return (bool)token;
case JTokenType.Date:
return (DateTime)token;
case JTokenType.Bytes:
return (byte[])token;
case JTokenType.Guid:
return (Guid)token;
case JTokenType.Uri:
return (Uri)token;
case JTokenType.TimeSpan:
return (TimeSpan)token;
default:
return null;
}
}
async Task ParseJson()
{
_initialized = true;
if (Source == null)
return;
IsLoading = true;
string json = await Source.GetJson();
JToken jToken = JToken.Parse(json);
ParseJsonToken(jToken);
IsLoading = false;
}
void ParseJsonToken(JToken token)
{
var jArray = token as JArray;
var jObject = token as JObject;
if (jArray != null)
{
for (var i = 0; i < jArray.Count; i++)
{
JToken obj = jArray[i];
_dataItems.Add(new DataItem(i.ToString(), GetValueForJToken(obj)));
}
}
else if (jObject != null)
{
foreach (KeyValuePair<string, JToken> kvp in jObject)
{
_dataItems.Add(new DataItem(kvp.Key, GetValueForJToken(kvp.Value)));
}
}
}
}
}
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