/*
        AUTOMATICALLY GENERATED BY jTemp FROM
        /Users/jsh2/Work/openimaj/target/checkout/core/core/src/main/jtemp/org/openimaj/util/pair/#A##B#Pair.jtemp
*/
/**
 * Copyright (c) 2011, The University of Southampton and the individual contributors.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 *   *  Redistributions of source code must retain the above copyright notice,
 *      this list of conditions and the following disclaimer.
 *
 *   *  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.
 *
 *   *  Neither the name of the University of Southampton nor the names of its
 *      contributors may be used to endorse or promote products derived from this
 *      software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER 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.
 */
package org.openimaj.util.pair;

import java.util.Comparator;

/**
 * A pair of double and double types
 * 
 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk)
 *
 */
public class DoubleDoublePair {
    /**
     * Comparator for comparing the first element of a {@link DoubleDoublePair} in ascending order.
     */
    public static final Comparator<DoubleDoublePair> FIRST_ITEM_ASCENDING_COMPARATOR = new Comparator<DoubleDoublePair>() {
        @Override
                public int compare(DoubleDoublePair o1, DoubleDoublePair o2) {
                        if (o1.first < o2.first)
                                return -1;
                        if (o1.first > o2.first)
                                return 1;
                        return 0;
                }
        };
        
        /**
     * Comparator for comparing the first element of a {@link DoubleDoublePair} in descending order.
     */
        public static final Comparator<DoubleDoublePair> FIRST_ITEM_DESCENDING_COMPARATOR = new Comparator<DoubleDoublePair>() {
        @Override
                public int compare(DoubleDoublePair o1, DoubleDoublePair o2) {
                        if (o1.first < o2.first)
                                return 1;
                        if (o1.first > o2.first)
                                return -1;
                        return 0;
                }
        };
        
        /**
     * Comparator for comparing the second element of a {@link DoubleDoublePair} in ascending order.
     */
        public static final Comparator<DoubleDoublePair> SECOND_ITEM_ASCENDING_COMPARATOR = new Comparator<DoubleDoublePair>() {
        @Override
                public int compare(DoubleDoublePair o1, DoubleDoublePair o2) {
                        if (o1.second < o2.second)
                                return -1;
                        if (o1.second > o2.second)
                                return 1;
                        return 0;
                }
        };
        
        /**
     * Comparator for comparing the second element of a {@link DoubleDoublePair} in descending order.
     */
        public static final Comparator<DoubleDoublePair> SECOND_ITEM_DESCENDING_COMPARATOR = new Comparator<DoubleDoublePair>() {
        @Override
                public int compare(DoubleDoublePair o1, DoubleDoublePair o2) {
                        if (o1.second < o2.second)
                                return 1;
                        if (o1.second > o2.second)
                                return -1;
                        return 0;
                }
        };
    
        /**
         * The first element of the pair  
         */
        public double first; 
        
        /**
         * The first element of the pair  
         */
        public double second; 
        
        /**
         * Construct pair with given values
         * 
         * @param f first value
         * @param s second value
         */
        public DoubleDoublePair(double f, double s) {first=f; second=s;}

        /**
         * Construct empty pair 
         */
        public DoubleDoublePair() {}
        
        /**
         * Get the value of the first element
         * @return the first value
         */
        public double getFirst() {
                return first;
        }

        /**
         * Set the value of the first element
         * @param first the value to set
         */
        public void setFirst(double first) {
                this.first = first;
        }

        /**
         * Get the value of the second element
         * @return the second
         */
        public double getSecond() {
                return second;
        }

        /**
         * Set the value of the second element
         * @param second the value to set
         */
        public void setSecond(double second) {
                this.second = second;
        }
        
        /**
         * Create a pair from the given values.
         * 
         * @param a The first object.
         * @param b The second object.
         * @return The pair.
         */
        public static DoubleDoublePair pair(double a, double b) {
                return new DoubleDoublePair(a, b);
        }

        /**
         * Extract the second values from a list of pairs.
         *
         * @param data the data
         * @return extracted second values
         */
        public static gnu.trove.list.array.TDoubleArrayList getSecond(Iterable<DoubleDoublePair> data) {
                gnu.trove.list.array.TDoubleArrayList extracted = new gnu.trove.list.array.TDoubleArrayList();

                for (DoubleDoublePair item : data)
                        extracted.add(item.second);

                return extracted;
        }

        /**
         * Extract the first values from a list of pairs.
         * 
         * @param data the data
         * @return extracted first values
         */
        public static gnu.trove.list.array.TDoubleArrayList getFirst(Iterable<DoubleDoublePair> data) {
                gnu.trove.list.array.TDoubleArrayList extracted = new gnu.trove.list.array.TDoubleArrayList();

                for (DoubleDoublePair item : data)
                        extracted.add(item.first);

                return extracted;
        }       
        
        @Override
        public String toString() {
                return "("+first + ", "+ second+")";
        }
}