/*
 * Tai-e: A Static Analysis Framework for Java
 *
 * Copyright (C) 2022 Tian Tan <tiantan@nju.edu.cn>
 * Copyright (C) 2022 Yue Li <yueli@nju.edu.cn>
 *
 * This file is part of Tai-e.
 *
 * Tai-e is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation, either version 3
 * of the License, or (at your option) any later version.
 *
 * Tai-e 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 Lesser General
 * Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Tai-e. If not, see <https://www.gnu.org/licenses/>.
 */

package pascal.taie.analysis.dataflow.analysis;

import pascal.taie.analysis.graph.cfg.CFG;
import pascal.taie.analysis.graph.cfg.CFGEdge;

public abstract class AbstractDataflowAnalysis<Node, Fact>
        implements DataflowAnalysis<Node, Fact> {

    protected final CFG<Node> cfg;

    protected AbstractDataflowAnalysis(CFG<Node> cfg) {
        this.cfg = cfg;
    }

    /**
     * By default, a data-flow analysis does not have edge transfer, i.e.,
     * does not need to perform transfer for any edges.
     */
    @Override
    public boolean needTransferEdge(CFGEdge<Node> edge) {
        return false;
    }

    @Override
    public Fact transferEdge(CFGEdge<Node> edge, Fact nodeFact) {
        throw new UnsupportedOperationException();
    }

    @Override
    public CFG<Node> getCFG() {
        return cfg;
    }
}
