/src/ZebraFlickr/Core/ChangeTracker.cs
C# | 124 lines | 73 code | 21 blank | 30 comment | 18 complexity | df21bfab0c90afc51edc21b6637b5144 MD5 | raw file
- #region License
-
- // Copyright (c) 2012 Gareth Lennox (garethl@dwakn.com)
- // All rights reserved.
- //
- // Redistribution and use in source and binary forms, with or without modification,
- // are permitted provided that the following conditions are met:
- //
- // * Redistributions of source code must retain the above copyright notice,
- // this list of conditions and the following disclaimer.
- // * Redistributions in binary form must reproduce the above copyright notice,
- // this list of conditions and the following disclaimer in the documentation
- // and/or other materials provided with the distribution.
- // * Neither the name of Gareth Lennox nor the names of its
- // contributors may be used to endorse or promote products derived from this
- // software without specific prior written permission.
- //
- // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
- // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
- // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- // THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- #endregion
-
- using System;
- using System.Collections;
- using LinFu.DynamicProxy;
-
- namespace ZebraFlickr.Core
- {
- public class ChangeTracker<T> : IDisposable, IInvokeWrapper
- where T : class
- {
- private static readonly ProxyFactory _proxyFactory = new ProxyFactory();
-
- private T _proxy;
- private T _value;
-
- public ChangeTracker(T value)
- {
- _value = value;
- _proxy = _proxyFactory.CreateProxy<T>(new CallAdapter(this));
- }
-
- public T Wrapped
- {
- get { return _proxy; }
- }
-
- #region Implementation of IInvokeWrapper
-
- public void BeforeInvoke(InvocationInfo info)
- {
- if (info.TargetMethod.Name.StartsWith("set_") && info.Arguments.Length == 1)
- {
- var result = typeof (T).GetMethod("get_" + info.TargetMethod.Name.Substring(4)).Invoke(_value, null);
-
- if (result is Array)
- {
- var a = (object[])info.Arguments[0];
- var b = (object[])result;
-
- if (a.Length == b.Length)
- {
- for (int x = 0; x < a.Length; x++)
- {
- if (Comparer.Default.Compare(a[x], b[x]) != 0)
- {
- if (Changed != null)
- Changed();
-
- return;
- }
- }
-
- return;
- }
-
- if (Changed != null)
- Changed();
- }
- else if (Comparer.Default.Compare(info.Arguments[0], result) != 0)
- {
- if (Changed != null)
- Changed();
- }
- }
- }
-
- public object DoInvoke(InvocationInfo info)
- {
- return info.TargetMethod.Invoke(_value, info.Arguments);
- }
-
- public void AfterInvoke(InvocationInfo info, object returnValue)
- {
- //nothing
- }
-
- #endregion
-
- public event Action Changed;
-
- #region Implementation of IDisposable
-
- /// <summary>
- /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
- /// </summary>
- /// <filterpriority>2</filterpriority>
- public void Dispose()
- {
- _proxy = null;
- _value = null;
- }
-
- #endregion
- }
- }