/*
 * Copyright 2021 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.score.stream.bavet.uni;

import java.util.List;
import java.util.function.Predicate;

import org.optaplanner.core.api.score.Score;
import org.optaplanner.core.impl.score.stream.bavet.BavetConstraintFactory;
import org.optaplanner.core.impl.score.stream.bavet.common.BavetNodeBuildPolicy;

public final class BavetFilterUniConstraintStream<Solution_, A> extends BavetAbstractUniConstraintStream<Solution_, A> {

    private final BavetAbstractUniConstraintStream<Solution_, A> parent;
    private final Predicate<A> predicate;

    public BavetFilterUniConstraintStream(BavetConstraintFactory<Solution_> constraintFactory,
            BavetAbstractUniConstraintStream<Solution_, A> parent,
            Predicate<A> predicate) {
        super(constraintFactory);
        this.parent = parent;
        this.predicate = predicate;
        if (predicate == null) {
            throw new IllegalArgumentException("The predicate (null) cannot be null.");
        }
    }

    @Override
    public boolean guaranteesDistinct() {
        return parent.guaranteesDistinct();
    }

    @Override
    public List<BavetFromUniConstraintStream<Solution_, Object>> getFromStreamList() {
        return parent.getFromStreamList();
    }

    // ************************************************************************
    // Node creation
    // ************************************************************************

    @Override
    protected BavetAbstractUniNode<A> createNode(BavetNodeBuildPolicy<Solution_> buildPolicy,
            Score<?> constraintWeight, BavetAbstractUniNode<A> parentNode) {
        return new BavetFilterUniNode<>(buildPolicy.getSession(), buildPolicy.nextNodeIndex(), parentNode, predicate);
    }

    @Override
    public String toString() {
        return "Filter() with " + childStreamList.size() + " children";
    }

    // ************************************************************************
    // Getters/setters
    // ************************************************************************

}
