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.
  // ===============================================================================
  
  /*
   * Created on Mar 22, 2005
   */
  package org.flexdock.docking.props;
  
  import java.util.HashSet;
  
  import org.flexdock.docking.Dockable;
  import org.flexdock.docking.DockingManager;
  import org.flexdock.docking.RegionChecker;
  
  /**
   * @author Christopher Butler
   */
  @SuppressWarnings(value = { "serial" })
  public class RootDockablePropertySet extends BasicDockablePropertySet {
      private static final Float DEFAULT_REGION_INSETS = new Float(RegionChecker.DEFAULT_REGION_SIZE);
      private static final Float DEFAULT_SIBLING_INSETS = new Float(DockingManager.getDefaultSiblingSize());
      public static final Float DEFAULT_DRAG_THRESHOLD = new Float(4);
      public static final Float DEFAULT_PREVIEW_SIZE = new Float(0.3);
  
      private HashSet constraints;
  
      public RootDockablePropertySet(Dockable dockable) {
          super(5, dockable);
          constraints = new HashSet(5);
  
          constrain(DESCRIPTION, "null");
          constrain(DOCKING_ENABLED, Boolean.TRUE);
          constrain(MOUSE_MOTION_DRAG_BLOCK, Boolean.TRUE);
          constrain(ACTIVE, Boolean.FALSE);
  
          constrain(REGION_SIZE_NORTH, DEFAULT_REGION_INSETS);
          constrain(REGION_SIZE_SOUTH, DEFAULT_REGION_INSETS);
          constrain(REGION_SIZE_EAST, DEFAULT_REGION_INSETS);
          constrain(REGION_SIZE_WEST, DEFAULT_REGION_INSETS);
  
          constrain(SIBLING_SIZE_NORTH, DEFAULT_SIBLING_INSETS);
          constrain(SIBLING_SIZE_SOUTH, DEFAULT_SIBLING_INSETS);
          constrain(SIBLING_SIZE_EAST, DEFAULT_SIBLING_INSETS);
          constrain(SIBLING_SIZE_WEST, DEFAULT_SIBLING_INSETS);
  
          constrain(TERRITORY_BLOCKED_NORTH, Boolean.FALSE);
          constrain(TERRITORY_BLOCKED_SOUTH, Boolean.FALSE);
          constrain(TERRITORY_BLOCKED_EAST, Boolean.FALSE);
          constrain(TERRITORY_BLOCKED_WEST, Boolean.FALSE);
          constrain(TERRITORY_BLOCKED_CENTER, Boolean.FALSE);
  
          constrain(DRAG_THRESHOLD, DEFAULT_DRAG_THRESHOLD);
          constrain(PREVIEW_SIZE, DEFAULT_PREVIEW_SIZE);
      }
  
      public void constrain(Object key, Object value) {
          if(key!=null && value!=null) {
              put(key, value);
              constraints.add(key);
          }
      }
  
  
      public synchronized Object remove(Object key) {
          return constraints.contains(key)? null: super.remove(key);
      }
  }
  