net.automatalib.words.impl.FastAlphabet Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of automata-core Show documentation

The core artifact of AutomataLib. This library contains concrete implementations for many of the automaton model interfaces defined in the API artifact, as well as abstract base classes that facilitate implementing new automaton model classes. Note that concrete algorithms (traversal, reachability analysis etc.) are not in the scope of this artifact.

There is a newer version: 0.11.0

Show newest version

/* Copyright (C) 2013-2018 TU Dortmund
 * This file is part of AutomataLib, http://www.automatalib.net/.
 *
 * 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 net.automatalib.words.impl;

import java.util.Arrays;
import java.util.List;

import javax.annotation.Nonnull;

import net.automatalib.commons.util.nid.DynamicList;
import net.automatalib.commons.util.nid.MutableNumericID;
import net.automatalib.words.GrowingAlphabet;

/**
 * A fast alphabet implementation, that assumes identifiers are stored directly in the input symbols.
 *
 * @param 
 *         input symbol class.
 *
 * @author Malte Isberner
 */
public class FastAlphabet extends DynamicList implements GrowingAlphabet {

    public FastAlphabet() {

    }

    @SafeVarargs
    public FastAlphabet(I... symbols) {
        this(Arrays.asList(symbols));
    }

    public FastAlphabet(List symbols) {
        for (I sym : symbols) {
            addSymbol(sym);
        }
    }

    @Override
    public int addSymbol(@Nonnull I a) {
        add(a);
        return a.getId();
    }

    @Override
    @Nonnull
    public I getSymbol(int index) {
        return get(index);
    }

    @Override
    public int getSymbolIndex(@Nonnull I symbol) {
        int id = symbol.getId();
        if (id < 0 || id >= size() || get(id) != symbol) {
            throw new IllegalArgumentException("Invalid symbol: " + symbol + " does not belong to this alphabet");
        }
        return id;
    }

    @Override
    public int compare(@Nonnull I o1, @Nonnull I o2) {
        return o1.getId() - o2.getId();
    }

    @Override
    public boolean containsSymbol(I symbol) {
        int index = symbol.getId();
        return index >= 0 && index < size() && get(index) == symbol;
    }

}