/*
 * Copyright 2013-2016 Cel Skeggs
 *
 * This file is part of the CCRE, the Common Chicken Runtime Engine.
 *
 * The CCRE is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option) any
 * later version.
 *
 * The CCRE 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 Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the CCRE.  If not, see <http://www.gnu.org/licenses/>.
 */
package ccre.channel;

import java.io.Serializable;

/**
 * A virtual node that is both a BooleanOutput and a BooleanInput. You can
 * modify its value, read its value, and subscribe to changes in its value.
 *
 * @author skeggsc
 */
public class BooleanCell extends AbstractUpdatingInput implements Serializable, BooleanIO {

    private static final long serialVersionUID = 4843658543933463459L;

    private boolean value;

    /**
     * Create a new BooleanCell with the value of false.
     */
    public BooleanCell() {
    }

    /**
     * Create a new BooleanCell with a specified value.
     *
     * @param default_ The default value.
     */
    public BooleanCell(boolean default_) {
        this.value = default_;
    }

    /**
     * Create a new BooleanCell with the value of false that automatically
     * updates all of the specified BooleanOutputs with the current state of
     * this BooleanCell. This is the same as creating a new BooleanCell and then
     * adding all of the BooleanOutputs as targets.
     *
     * @see BooleanCell#send(ccre.channel.BooleanOutput)
     * @param targets The BooleanOutputs to automatically update.
     */
    public BooleanCell(BooleanOutput... targets) {
        for (BooleanOutput out : targets) {
            send(out);
        }
    }

    @Override
    public final synchronized void set(boolean value) {
        if (this.value != value) {
            this.value = value;
            perform();
        }
    }

    @Override
    public final synchronized boolean get() {
        return value;
    }
}