/// <summary>
/// Returns the results of the query as a lazy collection.
/// </summary>
internal IEnumerable <TResult> ExecuteList <TResult>(
PageQueryParameters parameters, Func <PageData, TResult> selector,
Dictionary <string, QueryTypeProperties> pageProperties)
{
HttpQueryParameter primaryQueryContinue = null;
var revisions = parameters.PropQueryParametersCollection.SingleOrDefault(p => p.PropName == "revisions");
int limit = (revisions == null || revisions.OnlyFirst) ? -1 : 1;
var pagesCollection = parameters.PagesCollection;
do
{
var currentParameters = pagesCollection.GetNextPage(limit).ToArray();
var processedParameters = ProcessParameters(
parameters.PropQueryParametersCollection, currentParameters, pageProperties);
var generatorParameter = (HttpQueryParameter)currentParameters.SingleOrDefault(p => p.Name == "generator");
var generator = generatorParameter == null ? null : generatorParameter.Value;
var downloaded = QueryProcessor.Download(m_wiki, processedParameters, primaryQueryContinue);
var queryContinues = QueryProcessor.GetQueryContinues(downloaded);
HttpQueryParameter newPrimaryQueryContinue = null;
if (generator != null)
{
queryContinues.TryGetValue(generator, out newPrimaryQueryContinue);
queryContinues.Remove(generator);
}
var pagingManager = new PagingManager(
m_wiki, generator, parameters.PropQueryParametersCollection, currentParameters, pageProperties,
primaryQueryContinue, queryContinues);
var queryElement = downloaded.Element("query");
if (queryElement != null)
{
var partPageData = queryElement.Element("pages").Elements("page")
.Select(e => new PageData(m_wiki, e, pageProperties, pagingManager)).ToArray();
pagingManager.SetPages(partPageData);
var part = partPageData.Select(selector);
foreach (var item in part)
{
yield return(item);
}
}
primaryQueryContinue = newPrimaryQueryContinue;
} while (pagesCollection.HasMorePages(primaryQueryContinue));
}
public PageData(
WikiInfo wiki, XElement element, Dictionary <string, QueryTypeProperties> pageProperties,
PagingManager pagingManager)
{
m_wiki = wiki;
m_pageProperties = pageProperties;
m_pagingManager = pagingManager;
GetOrCreateDataList("info").Add(m_pageProperties["info"].Parser(element, wiki));
var pageIdAttribute = element.Attribute("pageid");
if (pageIdAttribute != null)
{
PageId = ValueParser.ParseInt64(pageIdAttribute.Value);
AddData(element);
}
}
