/// <summary>
/// Returns the hacker news on the website.
/// </summary>
/// <param name="filterField">.</param>
/// <param name="filterOperation">.</param>
/// <param name="orderByField">.</param>
/// <param name="orderByFieldDesc">.</param>
/// <param name="maxResultCount">.</param>
/// <returns>.</returns>
public async Task <IList <HackerNewsItem> > GetHackerNewsManualCleaner(HackerNewsFieldEnum filterField, HackerNewsFilterOperationEnum filterOperation, HackerNewsFieldEnum orderByField, bool orderByFieldDesc, int maxResultCount)
{
IList <HackerNewsItem> hackerNewsItemList;
// Initialize http client
using (HackerNewsClient hackerNewsClient = new HackerNewsClient())
{
// Get response from web site
using (Stream hackerNewsHtmlContent = await hackerNewsClient.GetNewsAsStream())
{
ManualHtmlTableParser dataManualScraping = new ManualHtmlTableParser();
hackerNewsItemList = await dataManualScraping.ScrapeHackerNewsHtmlContent(hackerNewsHtmlContent, maxResultCount);
}
}
LambdaExpressionBuilder <HackerNewsItem> expressionBuilder = new LambdaExpressionBuilder <HackerNewsItem>();
Expression <Func <HackerNewsItem, bool> > filteringQuery = GetHackerNewsItemExpressionFilter(expressionBuilder, filterField, filterOperation);
Expression <Func <HackerNewsItem, object> > sortingQuery = GetHackerNewsItemExpressionSort(expressionBuilder, orderByField, orderByFieldDesc);
// DEBUG: To check the final value
if (filteringQuery != null)
{
hackerNewsItemList = hackerNewsItemList.Where(filteringQuery.Compile()).ToList();
}
if (sortingQuery != null)
{
if (orderByFieldDesc)
{
hackerNewsItemList = hackerNewsItemList.OrderByDescending(sortingQuery.Compile()).ToList();
}
else
{
hackerNewsItemList = hackerNewsItemList.OrderBy(sortingQuery.Compile()).ToList();
}
}
return(hackerNewsItemList);
}
/// <summary>
/// The GetHackerNewsItemExpressionFilter.
/// </summary>
/// <param name="expressionBuilder">The expressionBuilder<see cref="LambdaExpressionBuilder{HackerNewsItem}"/>.</param>
/// <param name="filterField">The filterField<see cref="HackerNewsFieldEnum"/>.</param>
/// <param name="filterOperation">The filterOperation<see cref="HackerNewsFilterOperationEnum"/>.</param>
/// <returns>The <see cref="Expression{Func{HackerNewsItem, bool}}"/>.</returns>
private Expression <Func <HackerNewsItem, bool> > GetHackerNewsItemExpressionFilter(LambdaExpressionBuilder <HackerNewsItem> expressionBuilder, HackerNewsFieldEnum filterField, HackerNewsFilterOperationEnum filterOperation)
{
IList <QueryFilter> queryFilterList = new List <QueryFilter>();
var queryFilter = new QueryFilter
{
PropertyPath = filterField.GetDescription(),
};
if (filterOperation == HackerNewsFilterOperationEnum.MoreThanFiveWords)
{
queryFilter.Operator = LambdaExpressionBuilder.Enums.OperatorEnum.GreaterThan;
queryFilter.PropertyValue = "5";
}
if (filterOperation == HackerNewsFilterOperationEnum.MoreThanOrEqualToFiveWords)
{
queryFilter.Operator = LambdaExpressionBuilder.Enums.OperatorEnum.GreaterThanOrEqualTo;
queryFilter.PropertyValue = "5";
}
if (filterOperation == HackerNewsFilterOperationEnum.LessThanFiveWords)
{
queryFilter.Operator = LambdaExpressionBuilder.Enums.OperatorEnum.LessThan;
queryFilter.PropertyValue = "5";
}
if (filterOperation == HackerNewsFilterOperationEnum.LessThanOrEqualToFiveWords)
{
queryFilter.Operator = LambdaExpressionBuilder.Enums.OperatorEnum.LessThanOrEqualTo;
queryFilter.PropertyValue = "5";
}
queryFilterList.Add(queryFilter);
return(expressionBuilder.BuildQueryFilteringExpression(queryFilterList));
}
/// <summary>
/// Returns the hacker news on the website.
/// </summary>
/// <param name="filterField">.</param>
/// <param name="filterOperation">.</param>
/// <param name="orderByField">.</param>
/// <param name="orderByFieldDesc">.</param>
/// <param name="maxResultCount">.</param>
/// <returns>.</returns>
public async Task <IList <HackerNewsItem> > GetHackerNewsHtmlSanitizer(HackerNewsFieldEnum filterField, HackerNewsFilterOperationEnum filterOperation, HackerNewsFieldEnum orderByField, bool orderByFieldDesc, int maxResultCount)
{
IList <HackerNewsItem> hackerNewsItemList;
// Initialize http client
using (HackerNewsClient hackerNewsClient = new HackerNewsClient())
{
// Get response from web site
string hackerNewsHtmlContent = await hackerNewsClient.GetNewsAsString();
HtmlDocumentSanitizer dataManualScraping = new HtmlDocumentSanitizer();
hackerNewsItemList = dataManualScraping.ScrapeHackerNewsHtmlContent(hackerNewsHtmlContent, maxResultCount);
}
hackerNewsItemList = FilterHackerNews(hackerNewsItemList, filterField, filterOperation, orderByField, orderByFieldDesc);
return(hackerNewsItemList);
}
/// <summary>
/// The FilterHackerNews.
/// </summary>
/// <param name="hackerNewsItemList">The hackerNewsItemList<see cref="IList{HackerNewsItem}"/>.</param>
/// <param name="filterField">The filterField<see cref="HackerNewsFieldEnum"/>.</param>
/// <param name="filterOperation">The filterOperation<see cref="HackerNewsFilterOperationEnum"/>.</param>
/// <param name="orderByField">The orderByField<see cref="HackerNewsFieldEnum"/>.</param>
/// <param name="orderByFieldDesc">The orderByFieldDesc<see cref="bool"/>.</param>
/// <returns>The <see cref="IList{HackerNewsItem}"/>.</returns>
private IList <HackerNewsItem> FilterHackerNews(IList <HackerNewsItem> hackerNewsItemList, HackerNewsFieldEnum filterField, HackerNewsFilterOperationEnum filterOperation, HackerNewsFieldEnum orderByField, bool orderByFieldDesc)
{
LambdaExpressionBuilder <HackerNewsItem> expressionBuilder = new LambdaExpressionBuilder <HackerNewsItem>();
Expression <Func <HackerNewsItem, bool> > filteringQuery = GetHackerNewsItemExpressionFilter(expressionBuilder, filterField, filterOperation);
Expression <Func <HackerNewsItem, object> > sortingQuery = GetHackerNewsItemExpressionSort(expressionBuilder, orderByField, orderByFieldDesc);
// DEBUG: To check the final value
if (filteringQuery != null)
{
hackerNewsItemList = hackerNewsItemList.Where(filteringQuery.Compile()).ToList();
}
if (sortingQuery != null)
{
if (orderByFieldDesc)
{
hackerNewsItemList = hackerNewsItemList.OrderByDescending(sortingQuery.Compile()).ToList();
}
else
{
hackerNewsItemList = hackerNewsItemList.OrderBy(sortingQuery.Compile()).ToList();
}
}
return(hackerNewsItemList);
}
