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/**
 * 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;

/**
 * 

* A {@link Preference} encapsulates an item and a preference value, which indicates the strength of the * preference for it. {@link Preference}s are associated to users. *

*/ 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); }




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