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MemoryDirectoryService.cs
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MemoryDirectoryService.cs
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//
// Copyright 2012, Xamarin Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text.RegularExpressions;
using System.Threading;
using System.Threading.Tasks;
using EmployeeDirectory.Data;
namespace EmployeeDirectory
{
public class MemoryDirectoryService : IDirectoryService
{
List<Person> people;
Dictionary<string, PropertyInfo> properties;
public MemoryDirectoryService (IEnumerable<Person> people)
{
this.people = people.ToList ();
this.properties = typeof (Person).GetProperties ().ToDictionary (p => p.Name);
}
#region IDirectoryService implementation
public void Dispose ()
{
}
public Task LoginAsync (string username, string password, CancellationToken cancellationToken)
{
return Task.Factory.StartNew (() => {
//Just for testing
Thread.Sleep (2000);
});
}
public Task<IList<Person>> SearchAsync (Filter filter, int sizeLimit, CancellationToken cancellationToken)
{
return Task.Factory.StartNew (() => {
var s = Search (filter);
var list = s.ToList ();
return (IList<Person>)list;
}, cancellationToken);
}
IEnumerable<Person> Search (Filter filter)
{
if (filter is OrFilter) {
var f = (OrFilter)filter;
var r = Enumerable.Empty<Person> ();
foreach (var sf in f.Filters) {
r = r.Concat (Search (sf));
}
return r.Distinct ();
}
else if (filter is AndFilter) {
throw new NotImplementedException ();
}
else if (filter is NotFilter) {
throw new NotImplementedException ();
}
else if (filter is EqualsFilter) {
var f = (EqualsFilter)filter;
var upper = f.Value.ToUpperInvariant ();
var prop = properties[f.PropertyName];
var q = from p in people
let v = prop.GetValue (p, null)
where v != null && v.ToString ().ToUpperInvariant () == upper
select p;
return q;
}
else if (filter is ContainsFilter) {
var f = (ContainsFilter)filter;
var re = new Regex (Regex.Escape(f.Value).Replace("\\ ", "|"), RegexOptions.IgnoreCase);
var prop = properties[f.PropertyName];
var q = from p in people
let v = prop.GetValue (p, null)
where v != null && re.IsMatch (v.ToString ())
select p;
return q;
}
else {
throw new NotSupportedException ("Unsupported filter type: " + filter.GetType ());
}
}
#endregion
#region File IO
public static MemoryDirectoryService FromCsv (string path)
{
using (var reader = File.OpenText (path)) {
return FromCsv (reader);
}
}
public static MemoryDirectoryService FromCsv (TextReader textReader)
{
var reader = new CsvReader<Person> (textReader);
return new MemoryDirectoryService (reader.ReadAll ());
}
#endregion
}
}