/// <summary>
/// 不能为空
/// </summary>
/// <param name="hashModel"></param>
public static void ShouldNotNull(this IHashDictionary hashModel)
{
if (hashModel == null)
{
throw new ArgumentNullException("hashModel");
}
}
/// <summary>
/// 检测是否某一项改变
/// </summary>
/// <param name="hashModel"></param>
/// <param name="key"></param>
/// <returns></returns>
public static bool CheckChanged(this IHashDictionary hashModel, string key)
{
if (hashModel == null || key == null)
{
return(false);
}
var hashValues = hashModel.GetHashValues();
if (!hashValues.ContainsKey(key))
{
return(false);
}
var hashValue = hashValues[key];
var properties = hashModel.GetProperties();
if (!properties.ContainsKey(key))
{
//be removed!
return(true);
}
var sameHash = properties[key].VerifyObjectHash(hashValue.Hash);
if (!sameHash)
{
//hash不一样，一定变化
return(true);
}
//哈希值虽然一样，但只要不是初始版本的，都视为变化（新增）
var initVersion = hashModel.GetVersions().LastOrDefault();
return(initVersion != hashValue.Version);
}
/// <summary>
/// 按照是否包含并且变化决定调用处理程序（如果模型中确实包含某属性，并且确实检测到变化，才调用处理程序）
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="hashModel"></param>
/// <param name="key"></param>
/// <param name="proecessAction"></param>
public static void AutoProcessProperty <T>(this IHashDictionary hashModel, string key, Action <T> proecessAction)
{
var value = hashModel.GetValueAs <T>(key);
if (value != null && hashModel.CheckChanged(key))
{
proecessAction(value);
}
}
/// <summary>
/// 按照是否包含并且变化决定调用处理程序（如果模型中确实包含某属性，并且确实检测到变化，才调用处理程序）
/// </summary>
/// <typeparam name="T"></typeparam>
/// <typeparam name="TResult"></typeparam>
/// <param name="hashModel"></param>
/// <param name="key"></param>
/// <param name="proecessFunc"></param>
public static TResult AutoProcessProperty <T, TResult>(this IHashDictionary hashModel, string key, Func <T, TResult> proecessFunc)
{
var value = hashModel.GetValueAs <T>(key);
if (value != null && hashModel.CheckChanged(key))
{
return(proecessFunc(value));
}
return(default(TResult));
}
/// <summary>
/// 按照指示决定是否添加值到属性中
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="hashModel"></param>
/// <param name="key"></param>
/// <param name="shouldInclude"></param>
/// <param name="getFunc"></param>
/// <returns></returns>
public static IHashDictionary AutoAddOrUpdate <T>(this IHashDictionary hashModel, string key, Func <string, bool> shouldInclude, Func <T> getFunc)
{
if (shouldInclude(key))
{
var value = getFunc();
var properties = hashModel.GetProperties();
properties[key] = value;
}
return(hashModel);
}
/// <summary>
/// 检测是否有任何项改变
/// </summary>
/// <param name="hashModel"></param>
/// <returns></returns>
public static bool CheckAnyChanged(this IHashDictionary hashModel)
{
if (hashModel == null)
{
return(false);
}
var hashValues = hashModel.GetHashValues();
foreach (var hashValue in hashValues)
{
var changedForKey = CheckChanged(hashModel, hashValue.Key);
if (changedForKey)
{
return(true);
}
}
return(false);
}
