FeatureEncoder.java

/*
 * Copyright 2010 Ted Dunning. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright notice, this list of
 *       conditions and the following disclaimer.
 *
 *    2. Redistributions in binary form must reproduce the above copyright notice, this list
 *       of conditions and the following disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation are those of the
 * authors and should not be interpreted as representing official policies, either expressed
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 */

package mia.classifier.ch16;

import org.apache.mahout.math.Vector;

/**
 * Utility class that collects encoder functions together.
 */
public class FeatureEncoder {
  UserEncoder user = new UserEncoder();
  ItemEncoder item = new ItemEncoder();
  UserItemEncoder userByItem = new UserItemEncoder();

  public void addUserFeatures(User u, Vector data) {
    user.addToVector(u, data);
  }

  public void addItemFeatures(Item x, Vector data) {
    item.addToVector(x, data);
  }

  public void addInteractions(User u, Item x, Vector data) {
    userByItem.addToVector(u, x, data);
  }

  public void addToVector(User u, Item x, Vector data) {
    addUserFeatures(u, data);
    addItemFeatures(x, data);
    addInteractions(u, x, data);
  }

  public long interactionHash(User u, Item x) {
    return userByItem.hash(u, x);
  }

}