///////////////////////////////////////////////////////////////////////////
//                   __                _      _   ________               //
//                  / /   ____  ____ _(_)____/ | / / ____/               //
//                 / /   / __ \/ __ `/ / ___/  |/ / / __                 //
//                / /___/ /_/ / /_/ / / /__/ /|  / /_/ /                 //
//               /_____/\____/\__, /_/\___/_/ |_/\____/                  //
//                           /____/                                      //
//                                                                       //
//               The Next Generation Logic Library                       //
//                                                                       //
///////////////////////////////////////////////////////////////////////////
//                                                                       //
//  Copyright 2015-20xx Christoph Zengler                                //
//                                                                       //
//  Licensed 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.logicng.formulas.cache;

/**
 * The pre-defined transformation cache entries.
 * @version 2.3.0
 * @since 1.0
 */
public enum TransformationCacheEntry implements CacheEntry {
    NNF("negation normal form"),
    PLAISTED_GREENBAUM_POS("Plaisted & Greenbaum conjunctive normal form (positive polarity)"),
    PLAISTED_GREENBAUM_NEG("Plaisted & Greenbaum conjunctive normal form (negative polarity)"),
    PLAISTED_GREENBAUM_VARIABLE("Plaisted & Greenbaum variable"),
    TSEITIN("Tseitin conjunctive normal form"),
    TSEITIN_VARIABLE("Tseitin variable"),
    FACTORIZED_CNF("factorized conjunctive normal form"),
    BDD_CNF("conjunctive normal form via BDD"),
    FACTORIZED_DNF("factorized disjunctive normal form"),
    BDD_DNF("disjunctive normal form via BDD"),
    AIG("and-inverter graph"),
    UNIT_PROPAGATION("unit propagation"),
    DISTRIBUTIVE_SIMPLIFICATION("distributive simplification"),
    ANONYMIZATION("anonymization");

    private final String description;

    /**
     * Constructs a new entry.
     * @param description the description of this entry
     */
    TransformationCacheEntry(final String description) {
        this.description = description;
    }

    @Override
    public String description() {
        return "TransformationCacheEntry{description=" + this.description + "}";
    }
}
