cc.redberry.transformation.collect.CollectTerms Maven / Gradle / Ivy

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/*
 * Redberry: symbolic tensor computations.
 *
 * Copyright (c) 2010-2012:
 *   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.transformation.collect;

import cc.redberry.core.tensor.Sum;
import cc.redberry.core.tensor.Tensor;
import cc.redberry.transformation.Transformation;
import cc.redberry.transformation.TransformationException;

/**
 *
 * @author Dmitry Bolotin
 * @author Stanislav Poslavsky
 */
public class CollectTerms implements Transformation {
    private final CollectInputPortImpl inputPort;

    public CollectTerms(SplitCriteria splitCriteria) {
        this.inputPort = new CollectInputPortImpl(splitCriteria);
    }

    @Override
    public Tensor transform(Tensor tensor) {
        if (!(tensor instanceof Sum))
            return tensor;
        if(inputPort.closed())
            throw new TransformationException("Transformation destroied: create new instance.");
        for (Tensor summand : tensor)
            inputPort.put(summand);
        inputPort.put(null);
        return inputPort.result();
    }
}