internal static MemoInfoCollection LoadRemovedMemoInfos(SqlServerAccessor accessor)
{
var ret = default(MemoInfoCollection);
try {
var xml = accessor.LoadTextDataValue("RemovedMemoInfo");
if (xml != null)
{
var serializer = new DataContractSerializer(typeof(MemoInfoCollection));
using (var xmlReader = new StringReader(xml))
using (var reader = XmlReader.Create(xmlReader)) {
ret = serializer.ReadObject(reader) as MemoInfoCollection;
}
}
} catch (Exception e) {
Logger.Warn("RemovedMemoinfos load failed", e);
}
if (ret == null)
{
ret = new MemoInfoCollection();
}
return(ret);
}
internal static string GetMemoInfosPassword(MemoInfoCollection memoInfos, string defaultPassword)
{
if (memoInfos.Count == 0)
{
return(defaultPassword);
}
else if (memoInfos.Count == 1)
{
return(GetHash(memoInfos[0].MemoId));
}
else if (memoInfos.Count == 2)
{
return(GetHash(memoInfos[0].MemoId + memoInfos[1].MemoId));
}
else
{
/// memoInfos.Count >= 3
var rand = new Random(memoInfos.Count);
var buf = new StringBuilder();
for (int i = 0; i < 3; ++i)
{
var r = rand.Next(memoInfos.Count);
var info = memoInfos[r];
buf.Append(info.MemoId);
}
return(GetHash(buf.ToString()));
}
}
internal static void SaveRemovedMemoInfos(MemoInfoCollection removedMemoInfos, SqlServerAccessor accessor)
{
var buf = new StringBuilder();
using (var writer = XmlWriter.Create(buf)) {
var serializer = new DataContractSerializer(typeof(MemoInfoCollection));
serializer.WriteObject(writer, removedMemoInfos);
}
var xml = buf.ToString();
if (accessor.IsTextDataExists("RemovedMemoInfo"))
{
accessor.UpdateTextData("RemovedMemoInfo", xml);
}
else
{
accessor.InsertTextData("RemovedMemoInfo", xml);
}
}
