/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.mahout.cf.taste.model;
/**
* <p>
* A encapsulates an item and a preference value, which indicates the strength of the
* preference for it. s are associated to users.
* </p>
*/
public interface Preference {
/** @return ID of user who prefers the item */
long getUserID();
/** @return item ID that is preferred */
long getItemID();
/**
* @return strength of the preference for that item. Zero should indicate "no preference either way";
* positive values indicate preference and negative values indicate dislike
*/
float getValue();
/**
* Sets the strength of the preference for this item
*
* @param value
* new preference
*/
void setValue(float value);
}