/* Copyright (C) 2013-2020 TU Dortmund
 * This file is part of LearnLib, http://www.learnlib.de/.
 *
 * 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 de.learnlib.filter.statistic.sul;

import de.learnlib.api.SUL;
import de.learnlib.api.statistic.StatisticSUL;
import de.learnlib.filter.statistic.Counter;

public class SymbolCounterSUL<I, O> implements StatisticSUL<I, O> {

    private final SUL<I, O> sul;
    private final Counter counter;

    public SymbolCounterSUL(String name, SUL<I, O> sul) {
        this(new Counter(name, "Symbols"), sul);
    }

    protected SymbolCounterSUL(Counter counter, SUL<I, O> sul) {
        this.counter = counter;
        this.sul = sul;
    }

    @Override
    public void pre() {
        sul.pre();
    }

    @Override
    public void post() {
        sul.post();
    }

    @Override
    public O step(I in) {
        counter.increment();
        return sul.step(in);
    }

    @Override
    public boolean canFork() {
        return sul.canFork();
    }

    @Override
    public SUL<I, O> fork() {
        return new SymbolCounterSUL<>(counter, sul.fork());
    }

    @Override
    public Counter getStatisticalData() {
        return counter;
    }
}
