private void Initialize() {
if (_isInitialized)
return;
_isInitialized = true;
_selResultOption = _resultOptions[0];
OnlineUriFactory.CreateOnlineUris();
foreach (var uri in OnlineUriFactory.OnlineUris) {
//create a query
OnlineQuery query = new OnlineQuery();
query.OnlineUri = uri;
_browseQueries.Add(query);
}
//init timer
_timer = new DispatcherTimer() {
Interval = TimeSpan.FromMilliseconds(25d),
IsEnabled = false
};
_timer.Tick += (o, e) => {
//update the progress bar
_progressValue += 1.0;
if (_progressValue > _maxProgressValue)
_progressValue = 1.0;
FrameworkApplication.Current.Dispatcher.Invoke(() => OnPropertyChanged("ProgressValue"));
};
}
/// <summary>
/// Execute the given query and return the result
/// </summary>
/// <param name="query"></param>
/// <returns></returns>
public async Task<string> ExecAsync(OnlineQuery query, ObservableCollection<OnlineResultItem> results, int maxResults = 0) {
if (maxResults == 0)
maxResults = OnlineQuery.DefaultMaxResults;
if (MaxResponseLength == 0)
MaxResponseLength = OnlineQuery.DefaultMaxResponseLength;
_response = new StringBuilder();
_errorResponse = "";
//slap in the initial request
_response.AppendLine(query.FinalUrl);
_response.AppendLine("");
try {
Tuple<long, long> stats = new Tuple<long, long>(-1, -1);
do {
query.Start = stats.Item2;
Debug.WriteLine("");
Debug.WriteLine(query.FinalUrl);
Debug.WriteLine("");
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(new Uri(query.FinalUrl));
req.Method = "GET";
req.Referer = query.Referer;
req.UserAgent = OnlineQuery.DefaultUserAgent;
//submit the query
var response = await req.GetResponseAsync();
//Headers for prosperity if we're debugging the response
WebHeaderCollection whc = response.Headers;
if (_response.Length < MaxResponseLength) {
for (int i = 0; i < whc.Count; i++)
_response.AppendLine(whc.GetKey(i) + " = " + whc.Get(i));
if (_response.Length > MaxResponseLength)
_response.AppendLine("...");
}
//read out the json
using (StreamReader sr = new StreamReader(response.GetResponseStream())) {
string raw = await sr.ReadToEndAsync();
//convert entity-replacement tags
raw = raw.Replace("<", "<").Replace(">", ">");
if (_response.Length < MaxResponseLength) {
_response.AppendLine("");
_response.AppendLine(raw);
if (_response.Length > MaxResponseLength)
_response.AppendLine("...");
}
Debug.WriteLine("");
Debug.WriteLine(raw);
Debug.WriteLine("");
//deserialize
stats = await ProcessResultsAsync(results, raw, query);
}
} while (stats.Item2 < maxResults && stats.Item2 > 0);
}
catch (WebException we) {
//bad request
_response.AppendLine("");
_response.AppendLine("WebException: " + we.Message);
_response.AppendLine(query.FinalUrl);
_response.AppendLine("");
_response.AppendLine(new Uri(query.FinalUrl).Scheme.ToUpper() + " " +
((int)we.Status).ToString());
try {
_errorResponse = new StreamReader(we.Response.GetResponseStream()).ReadToEnd();
_response.AppendLine(_errorResponse);
}
catch {
}
}
return _response.ToString();
}
private Task<Tuple<long, long>> ProcessResultsAsync(ObservableCollection<OnlineResultItem> results, string json, OnlineQuery query) {
//do this in the background
return Task.Run(() => {
long num = -1;
long next = -1;
if (json.IsEmpty())
return new Tuple<long, long>(num, next);
//process the query results
dynamic queryResults = JObject.Parse(json);
if (queryResults.error != null)
//there was an error in the query
return new Tuple<long, long>(num, next);
long numberOfTotalItems = queryResults.total.Value;
int count = 0;
if (numberOfTotalItems > 0) {
//these are the results
List<dynamic> userItemResults = new List<dynamic>();
// store the results in the list
userItemResults.AddRange(queryResults.results);
foreach (dynamic item in userItemResults) {
count++;
OnlineResultItem ri = new OnlineResultItem();
ri.Id = item.id;
ri.Title = item.title ?? String.Format("Item {0}", count);
ri.Snippet = item.snippet ?? "no snippet";
ri.Url = item.url ?? "";
string thumb = item.thumbnail ?? "";
ri.SetThumbnailURL(query.Portal, ri.Id, thumb);
results.Add(ri);
}
num = queryResults.num.Value;
next = queryResults.nextStart.Value;
}
return new Tuple<long, long>(num, next);
});
}
/// <summary>
/// Execute the given query and return the result
/// </summary>
/// <param name="query"></param>
/// <returns></returns>
public async Task<string> ExecWithEsriClientAsync(OnlineQuery query, ObservableCollection<OnlineResultItem> results, int maxResults = 0) {
if (maxResults == 0)
maxResults = OnlineQuery.DefaultMaxResults;
if (MaxResponseLength == 0)
MaxResponseLength = OnlineQuery.DefaultMaxResponseLength;
_response = new StringBuilder();
_errorResponse = "";
//slap in the initial request
_response.AppendLine(query.FinalUrl);
_response.AppendLine("");
try {
Tuple<long, long> stats = new Tuple<long, long>(-1, -1);
do {
query.Start = stats.Item2;
Debug.WriteLine("");
Debug.WriteLine(query.FinalUrl);
Debug.WriteLine("");
EsriHttpClient httpClient = new EsriHttpClient();
//submit the query
EsriHttpResponseMessage response = await httpClient.GetAsync(new Uri(query.FinalUrl).ToString());
HttpResponseHeaders headers = response.Headers;
//read out the json
string raw = await response.Content.ReadAsStringAsync();
//convert entity-replacement tags
raw = raw.Replace("<", "<").Replace(">", ">");
if (_response.Length < MaxResponseLength) {
_response.AppendLine("");
_response.AppendLine(raw);
if (_response.Length > MaxResponseLength)
_response.AppendLine("...");
}
Debug.WriteLine("");
Debug.WriteLine(raw);
Debug.WriteLine("");
//deserialize
stats = await ProcessResultsAsync(results, raw, query);
} while (stats.Item2 < maxResults && stats.Item2 > 0);
}
catch (WebException we) {
//bad request
_response.AppendLine("");
_response.AppendLine("WebException: " + we.Message);
_response.AppendLine(query.FinalUrl);
_response.AppendLine("");
_response.AppendLine(new Uri(query.FinalUrl).Scheme.ToUpper() + " " +
((int)we.Status).ToString());
try {
_errorResponse = new StreamReader(we.Response.GetResponseStream()).ReadToEnd();
_response.AppendLine(_errorResponse);
}
catch {
}
}
return _response.ToString();
}
