public class FileDataModel : AbstractDataModel

public class FileDataModel : AbstractDataModel

Public Class FileDataModel 
	Inherits AbstractDataModel

Public Class FileDataModel 
	Inherits AbstractDataModel

public ref class FileDataModel : public AbstractDataModel

public ref class FileDataModel : public AbstractDataModel

type FileDataModel =  
    class 
        inherit AbstractDataModel 
    end

type FileDataModel =  
    class 
        inherit AbstractDataModel 
    end

The FileDataModel type exposes the following members.

	Name	Description
	FileDataModel(String)	Initializes a new instance of the FileDataModel class
	FileDataModel(String, String)	Initializes a new instance of the FileDataModel class
	FileDataModel(String, Boolean, Int64, Boolean, String)	Initializes a new instance of the FileDataModel class

	Name	Description
	buildModel
	DetermineDelimiter
	Equals	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetDataFile
	GetDelimiter
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetItemIDs	(Overrides AbstractDataModel GetItemIDs .)
	GetItemIDsFromUser	(Overrides AbstractDataModel GetItemIDsFromUser(Int64).)
	GetLoadedDataModel
	GetMaxPreference	(Overrides AbstractDataModel GetMaxPreference .)
	GetMinPreference	(Overrides AbstractDataModel GetMinPreference .)
	GetNumItems	(Overrides AbstractDataModel GetNumItems .)
	GetNumUsers	(Overrides AbstractDataModel GetNumUsers .)
	GetNumUsersWithPreferenceFor(Int64)	(Overrides AbstractDataModel GetNumUsersWithPreferenceFor(Int64).)
	GetNumUsersWithPreferenceFor(Int64, Int64)	(Overrides AbstractDataModel GetNumUsersWithPreferenceFor(Int64, Int64).)
	GetPreferencesForItem	(Overrides AbstractDataModel GetPreferencesForItem(Int64).)
	GetPreferencesFromUser	(Overrides AbstractDataModel GetPreferencesFromUser(Int64).)
	GetPreferenceTime	(Overrides AbstractDataModel GetPreferenceTime(Int64, Int64).)
	GetPreferenceValue	(Overrides AbstractDataModel GetPreferenceValue(Int64, Int64).)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	GetUserIDs	(Overrides AbstractDataModel GetUserIDs .)
	HasPreferenceValues	(Overrides AbstractDataModel HasPreferenceValues .)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	processFile T
	processFileWithoutID
	processLine T
	processLineWithoutID
	readItemIDFromString
	readTimestampFromString
	readUserIDFromString
	Refresh	(Overrides AbstractDataModel Refresh(IList IRefreshable ).)
	reload
	RemovePreference	(Overrides AbstractDataModel RemovePreference(Int64, Int64).)
	setMaxPreference	(Inherited from AbstractDataModel.)
	setMinPreference	(Inherited from AbstractDataModel.)
	SetPreference	(Overrides AbstractDataModel SetPreference(Int64, Int64, Single).)
	ToString	(Overrides Object ToString .)

	Name	Description
	DEFAULT_MIN_RELOAD_INTERVAL_MS

userID,itemID[,preference[,timestamp]]

userID,itemID[,preference[,timestamp]]

Preference value is optional to accommodate applications that have no notion of a preference value (that is, the user simply expresses a preference for an item, but no degree of preference).

The preference value is assumed to be parseable as a

double

double

long

long

long

long

123,456,,129050099059

123,456,,129050099059

But this isn't:

123,456,129050099059

123,456,129050099059

It is also acceptable for the lines to contain additional fields. Fields beyond the third will be ignored. An empty line, or one that begins with '#' will be ignored as a comment.

This class will reload data from the data file when Refresh(IList IRefreshable ) is called, unless the file has been reloaded very recently already.

This class will also look for update "delta" files in the same directory, with file names that start the same way (up to the first period). These files have the same format, and provide updated data that supersedes what is in the main data file. This is a mechanism that allows an application to push updates to FileDataModel without re-copying the entire data file.

One small format difference exists. Update files must also be able to express deletes. This is done by ending with a blank preference value, as in "123,456,".

Note that it's all-or-nothing -- all of the items in the file must express no preference, or the all must. These cannot be mixed. Put another way there will always be the same number of delimiters on every line of the file!

This class is not intended for use with very large amounts of data (over, say, tens of millions of rows). For that, a JDBC-backed {@link DataModel} and a database are more appropriate.

It is possible and likely useful to subclass this class and customize its behavior to accommodate application-specific needs and input formats.