/*
* 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.impl.domain.variable.anchor;
import org.optaplanner.core.impl.domain.variable.supply.Supply;
import org.optaplanner.core.impl.score.director.InnerScoreDirector;
/**
* Only supported for chained variables.
* <p>
* To get an instance, demand a {@link AnchorVariableDemand} from {@link InnerScoreDirector#getSupplyManager()}.
*/
public interface AnchorVariableSupply extends Supply {
/**
* @param entity never null
* @return sometimes null, the anchor for the entity
*/
Object getAnchor(Object entity);
}