org.mymedialite.data
Class StaticRatings
java.lang.Object
org.mymedialite.data.DataSet
org.mymedialite.data.Ratings
org.mymedialite.data.StaticRatings
- All Implemented Interfaces:
- IDataSet, IRatings
- Direct Known Subclasses:
- StaticByteRatings, StaticFloatRatings
public class StaticRatings
- extends Ratings
Array-based storage for rating data..
Very memory-efficient.
This data structure does NOT support incremental updates.
Field Summary |
protected int |
pos
The position where the next rating will be stored. |
Method Summary |
void |
add(int user_id,
int item_id,
double rating)
Add a new rating. |
void |
removeAt(int index)
Remove the rating at the specified index |
void |
removeItem(int item_id)
Remove all events related to a given item. |
void |
removeUser(int user_id)
Remove all events related to a given user. |
int |
size()
|
Methods inherited from class org.mymedialite.data.Ratings |
add, add, average, buildByItemCounts, buildByUserCounts, countByItem, countByUser, get, get, get, isReadOnly, maxRating, minRating, set, tryGet, tryGet, tryGetIndex, values |
Methods inherited from class org.mymedialite.data.DataSet |
allItems, allUsers, buildItemIndices, buildRandomIndex, buildUserIndices, byItem, byUser, getIndex, getIndex, getItems, getUsers, items, maxItemID, maxUserID, randomIndex, tryGetIndex, users |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface org.mymedialite.data.IDataSet |
allItems, allUsers, buildItemIndices, buildRandomIndex, buildUserIndices, byItem, byUser, getIndex, getIndex, getItems, getUsers, items, maxItemID, maxUserID, randomIndex, tryGetIndex, users |
pos
protected int pos
- The position where the next rating will be stored.
StaticRatings
public StaticRatings()
StaticRatings
public StaticRatings(int size)
size
public int size()
- Specified by:
size
in interface IDataSet
- Specified by:
size
in interface IRatings
- Overrides:
size
in class DataSet
- Returns:
- the number of interaction events in the dataset.
add
public void add(int user_id,
int item_id,
double rating)
- Description copied from interface:
IRatings
- Add a new rating.
- Specified by:
add
in interface IRatings
- Overrides:
add
in class Ratings
- Parameters:
user_id
- the user IDitem_id
- the item IDrating
- the rating value
- Throws:
java.lang.IndexOutOfBoundsException
removeAt
public void removeAt(int index)
- Description copied from interface:
IRatings
- Remove the rating at the specified index
- Specified by:
removeAt
in interface IRatings
- Overrides:
removeAt
in class Ratings
- Parameters:
index
- the rating index
removeUser
public void removeUser(int user_id)
- Description copied from interface:
IDataSet
- Remove all events related to a given user.
- Specified by:
removeUser
in interface IDataSet
- Overrides:
removeUser
in class Ratings
- Parameters:
user_id
- the user ID
removeItem
public void removeItem(int item_id)
- Description copied from interface:
IDataSet
- Remove all events related to a given item.
- Specified by:
removeItem
in interface IDataSet
- Overrides:
removeItem
in class Ratings
- Parameters:
item_id
- the item ID