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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.

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/* 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.io.Serializable;

import net.automatalib.words.VPDAlphabet;

/**
 * Utility class used to wrap input symbols of a {@link VPDAlphabet}. Stores additional index information to allow fast
 * index-based access.
 *
 * @param 
 *         type of the payload
 *
 * @author Malte Isberner
 */
public final class VPDSym implements Serializable {

    private final VPDAlphabet.SymbolType type;
    private final T userObject;
    private final int localIndex, globalIndex;

    public VPDSym(final T userObject, final VPDAlphabet.SymbolType type, final int localIndex, final int globalIndex) {
        this.userObject = userObject;
        this.type = type;
        this.localIndex = localIndex;
        this.globalIndex = globalIndex;
    }

    public VPDAlphabet.SymbolType getType() {
        return type;
    }

    public T getUserObject() {
        return userObject;
    }

    public int getLocalIndex() {
        return localIndex;
    }

    public int getGlobalIndex() {
        return globalIndex;
    }

    @Override
    public String toString() {
        return String.valueOf(userObject);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof VPDSym)) {
            return false;
        }

        VPDSym vpdSym = (VPDSym) o;

        if (localIndex != vpdSym.localIndex) {
            return false;
        }
        if (globalIndex != vpdSym.globalIndex) {
            return false;
        }
        if (type != vpdSym.type) {
            return false;
        }
        return userObject.equals(vpdSym.userObject);
    }

    @Override
    public int hashCode() {
        int result = type.hashCode();
        result = 31 * result + userObject.hashCode();
        result = 31 * result + localIndex;
        result = 31 * result + globalIndex;
        return result;
    }
}