/*
* Copyright 2014 Red Hat, Inc. and/or its affiliates.
*
* 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.optaplanner.core.config.score.trend;
import org.optaplanner.core.api.domain.solution.PlanningSolution;
import org.optaplanner.core.api.score.Score;
import org.optaplanner.core.impl.score.trend.InitializingScoreTrend;
/**
* Bounds 1 score level of the possible {@link Score}s for a {@link PlanningSolution} as more and more variables are initialized
* (while the already initialized variables don't change).
* @see InitializingScoreTrend
*/
public enum InitializingScoreTrendLevel {
/**
* No predictions can be made.
*/
ANY,
/**
* During initialization, the {@link Score} is monotonically increasing.
* This means: given a non-fully initialized {@link PlanningSolution} with a {@link Score} A,
* initializing 1 or more variables (without altering the already initialized variables)
* will give a {@link PlanningSolution} for which the {@link Score} is better or equal to A.
* <p>
* In practice, this means that the score constraints of this score level are all positive,
* and initializing a variable cannot unmatch an already matched positive constraint.
* <p>
* Also implies the perfect minimum score is 0.
*/
ONLY_UP,
/**
* During initialization, the {@link Score} is monotonically decreasing.
* This means: given a non-fully initialized {@link PlanningSolution} with a {@link Score} A,
* initializing 1 or more variables (without altering the already initialized variables)
* will give a {@link PlanningSolution} for which the {@link Score} is worse or equal to A.
* <p>
* In practice, this means that the score constraints of this score level are all negative,
* and initializing a variable cannot unmatch an already matched negative constraint.
* <p>
* Also implies the perfect maximum score is 0.
*/
ONLY_DOWN;
}