content: // ===============================================================================
  // Authors: AFRL/RQQD
  // Organization: Air Force Research Laboratory, Aerospace Systems Directorate, Power and Control Division
  // 
  // Copyright (c) 2017 Government of the United State of America, as represented by
  // the Secretary of the Air Force.  No copyright is claimed in the United States under
  // Title 17, U.S. Code.  All Other Rights Reserved.
  // ===============================================================================
  
  /*
   * GRAL: GRAphing Library for Java(R)
   *
   * (C) Copyright 2009-2013 Erich Seifert <dev[at]erichseifert.de>,
   * Michael Seifert <mseifert[at]error-reports.org>
   *
   * This file is part of GRAL.
   *
   * GRAL 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.
   *
   * GRAL 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 GRAL.  If not, see <http://www.gnu.org/licenses/>.
   */
  package de.erichseifert.gral.io;
  
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.Set;
  
  /**
   * Abstract class that provides the basic functions to store capabilities of
   * a reader or a writer implementation.
   */
  public abstract class IOCapabilitiesStorage {
  	/** Set of all registered capabilities. */
  	private static final Set<IOCapabilities> capabilities
  		= new HashSet<IOCapabilities>();
  
  	/**
  	 * Initializes a new storage instance.
  	 */
  	protected IOCapabilitiesStorage() {
  	}
  
  	/**
  	 * Returns a {@code Set} with capabilities for all supported formats.
  	 * @return Capabilities.
  	 */
  	public static Set<IOCapabilities> getCapabilities() {
  		return Collections.unmodifiableSet(capabilities);
  	}
  
  	/**
  	 * Adds the specified capabilities to the Set of supported formats.
  	 * @param capabilities Capabilities to be added.
  	 */
  	protected static final void addCapabilities(IOCapabilities capabilities) {
  		IOCapabilitiesStorage.capabilities.add(capabilities);
  	}
  }
  