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IntegerKeyedObjectQueryValue.cs

//
// IntegerKeyedObjectQueryValue.cs
//
// Authors:
//   Scott Peterson <lunchtimemama@gmail.com>
//
// Copyright (C) 2008 Scott Peterson
//
// 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 System;

namespace Hyena.Query
{
    public abstract class IntegerKeyedObjectQueryValue<T> : IntegerQueryValue where T : class
    {
        private T object_value;

        public override void SetValue (long value)
        {
            object_value = null;
            base.SetValue (value);
        }

        public T ObjectValue {
            get {
                if (object_value == null) {
                    object_value = Resolve ();
                }
                return object_value;
            }
        }

        protected abstract T Resolve ();
    }
}

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