84 lines
3.1 KiB
C#
84 lines
3.1 KiB
C#
//
|
|
// ImapSearchQueryOptimizer.cs
|
|
//
|
|
// Author: Jeffrey Stedfast <jestedfa@microsoft.com>
|
|
//
|
|
// Copyright (c) 2013-2020 .NET Foundation and Contributors
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in
|
|
// all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
// THE SOFTWARE.
|
|
//
|
|
|
|
using MailKit.Search;
|
|
|
|
namespace MailKit.Net.Imap {
|
|
class ImapSearchQueryOptimizer : ISearchQueryOptimizer
|
|
{
|
|
#region ISearchQueryOptimizer implementation
|
|
|
|
public SearchQuery Reduce (SearchQuery expr)
|
|
{
|
|
if (expr.Term == SearchTerm.And) {
|
|
var and = (BinarySearchQuery) expr;
|
|
|
|
if (and.Left.Term == SearchTerm.All)
|
|
return and.Right.Optimize (this);
|
|
|
|
if (and.Right.Term == SearchTerm.All)
|
|
return and.Left.Optimize (this);
|
|
} else if (expr.Term == SearchTerm.Or) {
|
|
var or = (BinarySearchQuery) expr;
|
|
|
|
if (or.Left.Term == SearchTerm.All)
|
|
return SearchQuery.All;
|
|
|
|
if (or.Right.Term == SearchTerm.All)
|
|
return SearchQuery.All;
|
|
} else if (expr.Term == SearchTerm.Not) {
|
|
var unary = (UnarySearchQuery) expr;
|
|
|
|
switch (unary.Operand.Term) {
|
|
case SearchTerm.Not: return ((UnarySearchQuery) unary.Operand).Operand.Optimize (this);
|
|
case SearchTerm.NotAnswered: return SearchQuery.Answered;
|
|
case SearchTerm.Answered: return SearchQuery.NotAnswered;
|
|
case SearchTerm.NotDeleted: return SearchQuery.Deleted;
|
|
case SearchTerm.Deleted: return SearchQuery.NotDeleted;
|
|
case SearchTerm.NotDraft: return SearchQuery.Draft;
|
|
case SearchTerm.Draft: return SearchQuery.NotDraft;
|
|
case SearchTerm.NotFlagged: return SearchQuery.Flagged;
|
|
case SearchTerm.Flagged: return SearchQuery.NotFlagged;
|
|
case SearchTerm.NotRecent: return SearchQuery.Recent;
|
|
case SearchTerm.Recent: return SearchQuery.NotRecent;
|
|
case SearchTerm.NotSeen: return SearchQuery.Seen;
|
|
case SearchTerm.Seen: return SearchQuery.NotSeen;
|
|
}
|
|
|
|
if (unary.Operand.Term == SearchTerm.Keyword)
|
|
return new TextSearchQuery (SearchTerm.NotKeyword, ((TextSearchQuery) unary.Operand).Text);
|
|
|
|
if (unary.Operand.Term == SearchTerm.NotKeyword)
|
|
return new TextSearchQuery (SearchTerm.Keyword, ((TextSearchQuery) unary.Operand).Text);
|
|
}
|
|
|
|
return expr;
|
|
}
|
|
|
|
#endregion
|
|
}
|
|
}
|