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OptaPlanner solves planning problems. This lightweight, embeddable planning engine implements powerful and scalable algorithms to optimize business resource scheduling and planning. This module contains classes common to each implementation of Constraint streams.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
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package org.optaplanner.constraint.streams.common.penta;

import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.function.Function;

import org.optaplanner.constraint.streams.common.AbstractJoiner;
import org.optaplanner.core.api.function.QuadFunction;
import org.optaplanner.core.api.score.stream.penta.PentaJoiner;
import org.optaplanner.core.impl.score.stream.JoinerType;

public final class DefaultPentaJoiner extends AbstractJoiner implements PentaJoiner {

    private static final DefaultPentaJoiner NONE =
            new DefaultPentaJoiner(new QuadFunction[0], new JoinerType[0], new Function[0]);
    private final QuadFunction[] leftMappings;

    public  DefaultPentaJoiner(QuadFunction leftMapping, JoinerType joinerType,
            Function rightMapping) {
        super(rightMapping, joinerType);
        this.leftMappings = new QuadFunction[] { leftMapping };
    }

    private  DefaultPentaJoiner(QuadFunction[] leftMappings, JoinerType[] joinerTypes,
            Function[] rightMappings) {
        super(rightMappings, joinerTypes);
        this.leftMappings = leftMappings;
    }

    public static  DefaultPentaJoiner merge(List> joinerList) {
        if (joinerList.size() == 1) {
            return joinerList.get(0);
        }
        return joinerList.stream().reduce(NONE, DefaultPentaJoiner::and);
    }

    @Override
    public DefaultPentaJoiner and(PentaJoiner otherJoiner) {
        DefaultPentaJoiner castJoiner = (DefaultPentaJoiner) otherJoiner;
        int joinerCount = getJoinerCount();
        int castJoinerCount = castJoiner.getJoinerCount();
        int newJoinerCount = joinerCount + castJoinerCount;
        JoinerType[] newJoinerTypes = Arrays.copyOf(this.joinerTypes, newJoinerCount);
        QuadFunction[] newLeftMappings = Arrays.copyOf(this.leftMappings, newJoinerCount);
        Function[] newRightMappings = Arrays.copyOf(this.rightMappings, newJoinerCount);
        for (int i = 0; i < castJoinerCount; i++) {
            int newJoinerIndex = i + joinerCount;
            newJoinerTypes[newJoinerIndex] = castJoiner.getJoinerType(i);
            newLeftMappings[newJoinerIndex] = castJoiner.getLeftMapping(i);
            newRightMappings[newJoinerIndex] = castJoiner.getRightMapping(i);
        }
        return new DefaultPentaJoiner<>(newLeftMappings, newJoinerTypes, newRightMappings);
    }

    public QuadFunction getLeftMapping(int index) {
        return (QuadFunction) leftMappings[index];
    }

    public boolean matches(A a, B b, C c, D d, E e) {
        int joinerCount = getJoinerCount();
        for (int i = 0; i < joinerCount; i++) {
            JoinerType joinerType = getJoinerType(i);
            Object leftMapping = getLeftMapping(i).apply(a, b, c, d);
            Object rightMapping = getRightMapping(i).apply(e);
            if (!joinerType.matches(leftMapping, rightMapping)) {
                return false;
            }
        }
        return true;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof DefaultPentaJoiner)) {
            return false;
        }
        DefaultPentaJoiner other = (DefaultPentaJoiner) o;
        return Arrays.equals(joinerTypes, other.joinerTypes)
                && Arrays.equals(leftMappings, other.leftMappings)
                && Arrays.equals(rightMappings, other.rightMappings);
    }

    @Override
    public int hashCode() {
        return Objects.hash(Arrays.hashCode(joinerTypes), Arrays.hashCode(leftMappings), Arrays.hashCode(rightMappings));
    }
}