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//
// Versioned.cs
//
// Copyright (C) 2004 Novell, Inc.
//
//
// 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;
using System.Xml.Serialization;
namespace Beagle {
public class Versioned {
protected DateTime timestamp = new DateTime (0);
public bool ValidTimestamp {
get { return timestamp.Ticks > 0; }
}
[XmlAttribute]
public DateTime Timestamp {
get { return timestamp; }
set { timestamp = value; }
}
[XmlIgnore]
public double DaysSinceTimestamp {
get { return (DateTime.Now - timestamp).TotalDays; }
}
public bool IsObsoletedBy (DateTime timestamp)
{
return !ValidTimestamp || Timestamp < timestamp;
}
public bool IsObsoletedBy (Versioned other)
{
// We are never obsoleted by null.
if (other == null)
return false;
// Anything with a valid timestamp always is
// more recent than something w/o a timestamp.
if (ValidTimestamp || other.ValidTimestamp) {
if (other.ValidTimestamp)
return IsObsoletedBy (other.Timestamp);
else
return false;
}
return false;
}
public bool IsNewerThan (DateTime timestamp)
{
return ValidTimestamp && Timestamp > timestamp;
}
public bool IsNewerThan (Versioned other)
{
// We are always newer than null.
if (other == null)
return true;
// Anything with a valid timestamp always is
// more recent than something w/o a timestamp.
if (ValidTimestamp || other.ValidTimestamp) {
if (other.ValidTimestamp)
return IsNewerThan (other.Timestamp);
else
return true;
}
return false;
}
}
}
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