// RichTextKit
// Copyright © 2019-2020 Topten Software. All Rights Reserved.
// 
// Licensed under the Apache License, Version 2.0 (the "License"); you may 
// not use this product 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.Text;

namespace Topten.RichTextKit.Utils
{
	/// <summary>
	/// A simple bi-directional dictionary
	/// </summary>
	/// <typeparam name="T1">Key type</typeparam>
	/// <typeparam name="T2">Value type</typeparam>
	class BiDictionary<T1, T2>
	{
		public Dictionary<T1, T2> Forward = new Dictionary<T1, T2>();
		public Dictionary<T2, T1> Reverse = new Dictionary<T2, T1>();

		public void Clear()
		{
			Forward.Clear();
			Reverse.Clear();
		}

		public void Add( T1 key, T2 value )
		{
			Forward.Add( key, value );
			Reverse.Add( value, key );
		}

		public bool TryGetValue( T1 key, out T2 value )
		{
			return Forward.TryGetValue( key, out value );
		}

		public bool TryGetKey( T2 value, out T1 key )
		{
			return Reverse.TryGetValue( value, out key );
		}

		public bool ContainsKey( T1 key )
		{
			return Forward.ContainsKey( key );
		}

		public bool ContainsValue( T2 value )
		{
			return Reverse.ContainsKey( value );
		}
	}
}
