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 /*
  * Copyright 2010 JBoss Inc
  *
  * Licensed 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.drools.planner.core.score;

A Score is result of the score function (AKA fitness function) on a single possible solution.

Implementations must be immutable.

public interface Score<S extends Scoreextends Comparable<S> {

    
Returns a Score whose value is (this + augment).

Parameters:
augment value to be added to this Score
Returns:
this + augment
    S add(S augment);

    
Returns a Score whose value is (this - subtrahend).

Parameters:
subtrahend value to be subtracted from this Score
Returns:
this - subtrahend, rounded as necessary
    S subtract(S subtrahend);

    
Returns a Score whose value is (this * multiplicand). When rounding is needed, it should be floored (as defined by java.lang.Math.floor(double).

Parameters:
multiplicand value to be multiplied by this Score.
Returns:
this * multiplicand
    S multiply(double multiplicand);

    
Returns a Score whose value is (this / divisor). When rounding is needed, it should be floored (as defined by java.lang.Math.floor(double).

Parameters:
divisor value by which this Score is to be divided
Returns:
this / divisor
    S divide(double divisor);

    
Returns an array of doubles representing the Score. When rounding is needed, each rounding should be floored (as defined by java.lang.Math.floor(double).

A greater score level uses a lower array index than a lesser score level. The length of the returned array is stable for a specific Score implementation. For example: -0hard/-7soft returns new double{-0.0, -7.0}

Returns:
never null
    double[] toDoubleArray();
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