com.github.sdnwiselab.sdnwise.adapter.Adapter Maven / Gradle / Ivy

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/*
 * Copyright (C) 2015 SDN-WISE
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package com.github.sdnwiselab.sdnwise.adapter;

import java.util.Observable;
import java.util.Observer;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * This class is the abstract class that every adapter has to extend. It is an
 * observable class for the adaptation, but it is also an observer for changes
 * coming from the specfic adapter type.
 *
 * @author Sebastiano Milardo
 * @version 0.1
 */
public abstract class Adapter extends Observable implements Observer {

    /**
     * Opens this adapter.
     *
     * @return a boolean indicating the correct completition of the operation
     */
    public abstract boolean open();

    /**
     * Closes this adapter.
     *
     * @return a boolean indicating the correct completition of the operation
     */
    public abstract boolean close();

    /**
     * Sends a byte array using this adapter.
     *
     * @param data the array to be sent
     */
    public abstract void send(byte[] data);

    /**
     * Logs messages depending on the verbosity level.
     *
     * @param level a standar logging level
     * @param msg the string message to be logged
     */
    public void log(Level level, String msg) {
        Logger.getLogger(this.getClass().getName()).log(level, "[ADA]: {0}", msg);
    }

    /**
     * This method is called whenever the observed object is changed.
     *
     * @param o the observable object
     * @param arg an argumet passed to the notifyObservers method
     */
    @Override
    public final void update(Observable o, Object arg) {
        setChanged();
        notifyObservers(arg);
    }
}