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   *   Licensed to the Apache Software Foundation (ASF) under one
   *  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
   *  with the License.  You may obtain a copy of the License at
   *
   *    https://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
   *  software distributed under the License is distributed on an
   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   *  KIND, either express or implied.  See the License for the
   *  specific language governing permissions and limitations
   *  under the License.
   ****************************************************************/
  package org.apache.cayenne.pref;
  
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.prefs.BackingStoreException;
  import java.util.prefs.Preferences;
  
  import org.apache.cayenne.CayenneRuntimeException;
  
  public class ChildrenMapPreference extends PreferenceDecorator {
  
  	private Map<String, Object> children;
  	private List<String> removeObject;
  
  	public ChildrenMapPreference(CayennePreference delegate) {
  		super(delegate);
  		this.children = new HashMap<>();
  		this.removeObject = new ArrayList<>();
  	}
  
  	public ChildrenMapPreference(CayennePreference delegate, Preferences preferences) {
  		super(delegate);
  		delegate.setCurrentPreference(preferences);
  		this.children = new HashMap<>();
  	}
  
  	public void initChildrenPreferences() {
  		Map<String, Object> children = new HashMap<>();
  		try {
  			String[] names = getCurrentPreference().childrenNames();
  			for (String name : names) {
  				try {
  					Object newInstance = delegate.getClass()
  							.getConstructor(String.class, boolean.class)
  							.newInstance(name, true);
  					children.put(name, newInstance);
  				} catch (Throwable e) {
  					throw new CayenneRuntimeException("Error initializing preference", e);
  				}
  			}
  
  			this.children.putAll(children);
  		} catch (BackingStoreException e) {
  			e.printStackTrace();
  		}
  	}
  
  	public Map getChildrenPreferences() {
  		return children;
  	}
  
  	public CayennePreference getObject(String key) {
  		return (CayennePreference) children.get(key);
  	}
  
  	public void remove(String key) {
  		removeObject.add(key);
  		children.remove(key);
  	}
  
  	public CayennePreference create(String nodeName) {
  		try {
  			Object newInstance = delegate.getClass()
  					.getConstructor(String.class, boolean.class)
  					.newInstance(nodeName, false);
  			children.put(nodeName, newInstance);
  		} catch (Throwable e) {
  			throw new CayenneRuntimeException("Error creating preference");
  		}
  		return (CayennePreference) children.get(nodeName);
  	}
  
  	public void create(String nodeName, Object obj) {
  		children.put(nodeName, obj);
  	}
  
  	public void save() {
  		if (removeObject.size() > 0) {
  			for (String aRemoveObject : removeObject) {
  				try {
  					delegate.getCurrentPreference().node(aRemoveObject).removeNode();
  				} catch (BackingStoreException e) {
  					throw new CayenneRuntimeException("Error saving preference");
  				}
  			}
  		}
  
  		for (Map.Entry<String, Object> pairs : children.entrySet()) {
  			delegate.getCurrentPreference().node(pairs.getKey());
  			((CayennePreference) pairs.getValue()).saveObjectPreference();
  		}
  	}
  
  	public void cancel() {
  		this.children.clear();
  		initChildrenPreferences();
  	}
  }
  