/*
 * Redberry: symbolic tensor computations.
 *
 * Copyright (c) 2010-2015:
 *   Stanislav Poslavsky   
 *   Bolotin Dmitriy       
 *
 * This file is part of Redberry.
 *
 * Redberry is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Redberry is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Redberry. If not, see .
 */
package cc.redberry.core.indexmapping;

import cc.redberry.core.utils.OutputPort;

/**
 * The output port of mappings.
 *
 * @author Dmitry Bolotin
 * @author Stanislav Poslavsky
 * @see Mapping
 */
public final class MappingsPort implements OutputPort {
    private final OutputPort innerPort;

    MappingsPort(OutputPort innerPort) {
        this.innerPort = innerPort;
    }

    @Override
    public Mapping take() {
        IndexMappingBuffer temp = innerPort.take();
        if (temp == null) return null;
        return new Mapping(temp);
    }
}