public GenericQueryReader(ContentQueryTranslator translator, ContentResolver content, Resources resources,
Func <ICursor, Resources, T> selector)
{
if (translator == null)
{
throw new ArgumentNullException("translator");
}
if (content == null)
{
throw new ArgumentNullException("content");
}
if (resources == null)
{
throw new ArgumentNullException("resources");
}
if (selector == null)
{
throw new ArgumentNullException("selector");
}
this.translator = translator;
this.content = content;
this.resources = resources;
this.selector = selector;
}
internal ProjectionReader(ContentResolver content, ContentQueryTranslator translator,
Func <ICursor, int, T> selector)
{
this.content = content;
this.translator = translator;
this.selector = selector;
}
public GenericQueryReader(ContentQueryTranslator translator, ContentResolver content, Resources resources, Func <ICursor, Resources, T> selector, string defaultSort)
: this(translator, content, resources, selector)
{
if (defaultSort == null)
{
throw new ArgumentNullException("defaultSort");
}
this.defaultSort = defaultSort;
}
Object IQueryProvider.Execute(Expression expression)
{
var translator = new ContentQueryTranslator(this, tableFinder);
expression = translator.Translate(expression);
if (translator.IsCount || translator.IsAny)
{
ICursor cursor = null;
try
{
String[] projections = (translator.Projections != null)
? translator.Projections.Where(p => p.Columns != null).SelectMany(t => t.Columns).ToArray()
: null;
cursor = content.Query(
translator.Table,
projections,
translator.QueryString,
translator.ClauseParameters,
translator.SortString);
if (translator.IsCount)
{
return(cursor.Count);
}
else
{
return(cursor.Count > 0);
}
}
finally
{
if (cursor != null)
{
cursor.Close();
}
}
}
IQueryable q = GetObjectReader(translator).AsQueryable();
//IQueryable q = GetObjectReader (null).AsQueryable();
expression = ReplaceQueryable(expression, q);
if (expression.Type.IsGenericType && expression.Type.GetGenericTypeDefinition() == typeof(IOrderedQueryable <>))
{
return(q.Provider.CreateQuery(expression));
}
else
{
return(q.Provider.Execute(expression));
}
}
protected abstract IEnumerable GetObjectReader(ContentQueryTranslator translator);
internal MultiProjectionReader(ContentResolver content, ContentQueryTranslator translator)
{
this.content = content;
this.translator = translator;
}