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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 the Drools 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,
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package org.optaplanner.constraint.streams.drools.uni;

import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.function.Supplier;

import org.optaplanner.constraint.streams.drools.DroolsConstraintFactory;
import org.optaplanner.constraint.streams.drools.bi.DroolsAbstractBiConstraintStream;
import org.optaplanner.constraint.streams.drools.common.UniLeftHandSide;
import org.optaplanner.constraint.streams.drools.quad.DroolsAbstractQuadConstraintStream;
import org.optaplanner.constraint.streams.drools.tri.DroolsAbstractTriConstraintStream;
import org.optaplanner.core.api.function.QuadFunction;
import org.optaplanner.core.api.function.TriFunction;

public final class DroolsMappingUniConstraintStream
        extends DroolsAbstractUniConstraintStream {

    private final Supplier> leftHandSide;

    public  DroolsMappingUniConstraintStream(DroolsConstraintFactory constraintFactory,
            DroolsAbstractUniConstraintStream parent, Function mapping) {
        super(constraintFactory, parent.getRetrievalSemantics());
        this.leftHandSide = () -> parent.createLeftHandSide().andMap(mapping);
    }

    public  DroolsMappingUniConstraintStream(DroolsConstraintFactory constraintFactory,
            DroolsAbstractBiConstraintStream parent, BiFunction mapping) {
        super(constraintFactory, parent.getRetrievalSemantics());
        this.leftHandSide = () -> parent.createLeftHandSide().andMap(mapping);
    }

    public  DroolsMappingUniConstraintStream(DroolsConstraintFactory constraintFactory,
            DroolsAbstractTriConstraintStream parent, TriFunction mapping) {
        super(constraintFactory, parent.getRetrievalSemantics());
        this.leftHandSide = () -> parent.createLeftHandSide().andMap(mapping);
    }

    public  DroolsMappingUniConstraintStream(DroolsConstraintFactory constraintFactory,
            DroolsAbstractQuadConstraintStream parent, QuadFunction mapping) {
        super(constraintFactory, parent.getRetrievalSemantics());
        this.leftHandSide = () -> parent.createLeftHandSide().andMap(mapping);
    }

    @Override
    public boolean guaranteesDistinct() {
        return false; // map() can never guarantee distinct tuples, as we do not see inside of the mapping function.
    }

    // ************************************************************************
    // Pattern creation
    // ************************************************************************

    @Override
    public UniLeftHandSide createLeftHandSide() {
        return leftHandSide.get();
    }

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

}