org.optaplanner.constraint.streams.drools.uni.DroolsFromUniConstraintStream Maven / Gradle / Ivy

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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.
 */

package org.optaplanner.constraint.streams.drools.uni;

import org.optaplanner.constraint.streams.common.RetrievalSemantics;
import org.optaplanner.constraint.streams.drools.DroolsConstraintFactory;
import org.optaplanner.constraint.streams.drools.common.UniLeftHandSide;

public final class DroolsFromUniConstraintStream extends DroolsAbstractUniConstraintStream {

    private final Class fromClass;

    public DroolsFromUniConstraintStream(DroolsConstraintFactory constraintFactory, Class fromClass,
            RetrievalSemantics retrievalSemantics) {
        super(constraintFactory, retrievalSemantics);
        this.fromClass = fromClass;
    }

    @Override
    public boolean guaranteesDistinct() {
        return true;
    }

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

    @Override
    public UniLeftHandSide createLeftHandSide() {
        return new UniLeftHandSide<>(fromClass, constraintFactory.getVariableFactory());
    }

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

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

}