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   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
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   *
   *    https://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
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  package org.apache.cayenne.pref;
  
  import java.lang.reflect.Constructor;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.prefs.BackingStoreException;
  import java.util.prefs.Preferences;
  
  import org.apache.cayenne.CayenneRuntimeException;
  import org.apache.cayenne.modeler.pref.DBConnectionInfo;
  
  public class CayenneProjectPreferences {
  
      // for preferences not dependent on project
      private Map<Class<?>, ChildrenMapPreference> cayennePreferences;
  
      // for preferences dependent on project
      private Map<Preferences, CayennePreference> projectCayennePreferences;
  
      public CayenneProjectPreferences() {
          cayennePreferences = new HashMap<>();
          cayennePreferences.put(DBConnectionInfo.class, new ChildrenMapPreference(new DBConnectionInfo()));
          projectCayennePreferences = new HashMap<>();
  
          for (ChildrenMapPreference value : cayennePreferences.values()) {
              value.initChildrenPreferences();
          }
      }
  
      public ChildrenMapPreference getDetailObject(Class<?> className) {
          return cayennePreferences.get(className);
      }
  
      public CayennePreference getProjectDetailObject(
              Class<? extends CayennePreference> objectClass,
              Preferences preferences) {
  
          CayennePreference preference = projectCayennePreferences.get(preferences);
  
          if (preference == null) {
              try {
                  Constructor<? extends CayennePreference> ct = objectClass.getConstructor(Preferences.class);
                  preference = ct.newInstance(preferences);
                  projectCayennePreferences.put(preferences, preference);
              } catch (Throwable e) {
                  throw new CayenneRuntimeException("Error initializing preferences", e);
              }
          }
  
          return preference;
      }
  
      // delete property
      public void removeProjectDetailObject(Preferences preference) {
          try {
              preference.removeNode();
              projectCayennePreferences.remove(preference);
          } catch (BackingStoreException e) {
              throw new CayenneRuntimeException("Error delete preferences", e);
          }
      }
  }
  