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/**
* The MIT License
*
* Copyright (C) 2015 Asterios Raptis
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
* associated documentation files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge, publish, distribute,
* sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or
* substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
* NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package de.alpharogroup.comparators;
import java.security.SecureRandom;
import java.util.*;
/**
* A factory for creating custom {@link Comparator} objects
*/
public class ComparatorFactory
{
/**
* Factory method for create a new {@link Comparator} from the given {@link List} with the
* defined order
*
* @param
* the generic type of the elements
* @param definedOrder
* the defined order
* @return the comparator
*/
public static Comparator newComparator(final List definedOrder)
{
Objects.requireNonNull(definedOrder);
return Comparator.comparing(definedOrder::indexOf);
}
/**
* Factory method for create a comparator for random sort of map values
*
* @param
* the generic type of the key
* @param
* the generic type of the value
* @param map
* the map
* @param secureRandom
* the secure random object for random generation
* @return the comparator with random sort of map values
*/
public static Comparator newRandomMapValuesComparator(
Map map, SecureRandom secureRandom)
{
List numberCounterValues = new ArrayList<>(new TreeSet<>(map.values()));
Collections.shuffle(numberCounterValues, secureRandom);
return ComparatorFactory.newComparator(numberCounterValues);
}
/**
* Factory method for create a comparator for sort with the map values
*
* @param
* the generic type of the key
* @param
* the generic type of the value
* @param map
* the map
* @return the comparator for sort with the map values
*/
public static Comparator newMapValuesComparator(Map map)
{
List numberCounterValues = new ArrayList<>(new TreeSet<>(map.values()));
return ComparatorFactory.newComparator(numberCounterValues);
}
}
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