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A Java's Collaborative Filtering library to carry out experiments in research of Collaborative Filtering based Recommender Systems. The library has been designed from researchers to researchers.

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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.commons.math3.genetics;

import java.util.List;

/**
 * Interface indicating that the chromosome represents a permutation of objects.
 *
 * @param  type of the permuted objects
 * @since 2.0
 */
public interface PermutationChromosome {

    /**
     * Permutes the sequence of objects of type T according to the
     * permutation this chromosome represents. For example, if this chromosome
     * represents a permutation (3,0,1,2), and the unpermuted sequence is
     * (a,b,c,d), this yields (d,a,b,c).
     *
     * @param sequence the unpermuted (original) sequence of objects
     * @return permutation of sequence represented by this permutation
     */
    List decode(List sequence);

}