// deserialize an object from the given XML file
public static AbstractExercise ReadExerciseFromXml(string fileName)
{
if (fileName == null)
{
throw new System.ArgumentNullException();
}
// open XML file in FileStream
FileStream xmlFile = new FileStream(fileName, FileMode.Open);
// crete a text XML reader
// associated it with the opened XML file above
XmlDictionaryReader reader =
XmlDictionaryReader.CreateTextReader(xmlFile, new XmlDictionaryReaderQuotas());
// create a serializer for the AbstratExercise type
DataContractSerializer serizalizer = new DataContractSerializer(typeof(AbstractExercise));
// Deserialize the object
AbstractExercise exercise = (AbstractExercise)serizalizer.ReadObject(reader, true);
// close streams
reader.Close();
xmlFile.Close();
return(exercise);
}
// serialize the object exercise into XML file by fileName
public static void WriteExerciseToXml(AbstractExercise exercise, string fileName)
{
if (exercise == null ||
fileName == null)
{
throw new System.ArgumentNullException();
}
// open the XML file in FileStream
// overwrite the file if it exists, otherwise create a new one
FileStream xmlFile = new FileStream(fileName, FileMode.Create);
// create a text XML writer
// associated it with the opened XML file stream above
XmlDictionaryWriter xmlWriter = XmlDictionaryWriter.CreateTextWriter(xmlFile);
// create a serializer for the AbstractExercise type
DataContractSerializer serializer =
new DataContractSerializer(typeof(AbstractExercise));
// serialize the exercise object
serializer.WriteObject(xmlWriter, exercise);
// close streams
xmlWriter.Close();
xmlFile.Close();
}
protected override void DeleteThisExercise()
{
foreach (KeyValuePair <string, AbstractExercise> pair in NestedExercises_)
{
AbstractExercise.DeleteThis((AbstractExercise)pair.Value);
}
InvalidateThis();
}
// Equals (overload object.Equals())
// use the overriden GetHashCode() to test equality.
public bool Equals(AbstractExercise oth)
{
TestValid();
if (null == oth)
{
return(false);
}
else
{
return(this.GetHashCode() == oth.GetHashCode());
}
}
// delete an exercise in this album
public bool DeleteExercise(string name)
{
TestValid();
if (name != null && NestedExercises_.ContainsKey(name))
{
AbstractExercise ae = NestedExercises_[name];
AbstractExercise.DeleteThis(ae);
NestedExercises_.Remove(name);
return(true);
}
return(false);
}
// get and return the exercise named exerciseName
// nested in workDirectory
public static AbstractExercise GetExercise(ExerciseAlbum workDirectory, string exerciseName)
{
// validate input arguments
if (workDirectory == null ||
exerciseName == null ||
exerciseName == string.Empty)
{
throw new System.ArgumentException();
}
// get exercise
AbstractExercise exercise = workDirectory.GetExercise(exerciseName);
// validate the result
if (exercise == null)
{
throw new System.Exception(
"this album does not contain such exercise album or exercise single!");
}
return(exercise);
}
// add
// return true if success and vice versa
public bool AddExercise(AbstractExercise exercise)
{
TestValid();
// validate input
if (exercise == null || exercise.Name == string.Empty)
{
return(false);
}
// check duplicate exercise by name
// throw an exception if a duplicate exists
if (NestedExercises_.ContainsKey(exercise.Name))
{
string ErrorInfo = "This album already has a(n) " + exercise.Name + "!";
throw new System.Exception(ErrorInfo);
}
// insert to the backing field
//AbstractExercise newExercise = (AbstractExercise)exercise.Clone();
NestedExercises_.Add(exercise.Name, exercise);
return(true);
}
// load root album
//private static string rootAlbum = "RootAlbum.xml";
public static ExerciseAlbum LoadRootExerciseAlbum(string rootAlbumPath)
{
return((ExerciseAlbum)AbstractExercise.ReadExerciseFromXml(rootAlbumPath));
}
// to call the correct version of DeleteThisExercise at run-time
// based on the actual type of the object ae
protected static void DeleteThis(AbstractExercise ae)
{
ae.DeleteThisExercise();
}
