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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
   *  with the License.  You may obtain a copy of the License at
   *
   *    https://www.apache.org/licenses/LICENSE-2.0
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   *  Unless required by applicable law or agreed to in writing,
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   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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   *  specific language governing permissions and limitations
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   ****************************************************************/
  
  package org.apache.cayenne;
  
  import org.apache.cayenne.reflect.PropertyUtils;
  
  import java.io.IOException;
  import java.io.ObjectInputStream;
  import java.io.ObjectOutputStream;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.Map;
  
  /**
   * Implementation of {@link Persistent} that uses {@link Map} to store object fields.
   * <p>
   * This implementation was pre 4.1 default.
   * <p>
   * Since <b>4.1</b> it is recommended to use {@link PersistentObject} as superclass (and it is actually default now),
   * as it has better performance and lower memory consumption (<b>much</b> lower for small objects).
   * <p>
   * You may need to use this class only if you have some generic attributes created at runtime (also
   * consider {@link HybridPersistentObject} in this case) or if any compatibility issues arise.
   *
   * @see PersistentObject
   * @see HybridPersistentObject
   *
   * @since 5.0, renamed from CayenneDataObject
   */
  public class GenericPersistentObject extends PersistentObject {
  
  	private static final long serialVersionUID = -313743913882350400L;
  
  	protected Map<String, Object> values = new HashMap<>();
  
  	@Override
  	public void setPersistenceState(int persistenceState) {
  		super.setPersistenceState(persistenceState);
  		// additionally clear values for HOLLOW state
  		if (persistenceState == PersistenceState.HOLLOW) {
  			values.clear();
  		}
  	}
  
  	@Override
  	Object readSimpleProperty(String property) {
  		// side effect - resolves HOLLOW object
  		Object object = readProperty(property);
  
  		// if a null value is returned, there is still a chance to
  		// find a non-persistent property via reflection
  		if (object == null && !values.containsKey(property)) {
  			object = PropertyUtils.getProperty(this, property);
  		}
  
  		return object;
  	}
  
  	@Override
  	public Object readPropertyDirectly(String propName) {
  		return values.get(propName);
  	}
  
  	@Override
  	public void writePropertyDirectly(String propName, Object val) {
  		values.put(propName, val);
  	}
  
  	@Override
  	protected void appendProperties(StringBuffer buffer) {
  		buffer.append("[");
  		Iterator<Map.Entry<String, Object>> it = values.entrySet().iterator();
  
  		while (it.hasNext()) {
  			Map.Entry<String, Object> entry = it.next();
  
  			buffer.append(entry.getKey()).append("=>");
  			Object value = entry.getValue();
  
  			if (value instanceof Persistent) {
  				buffer.append('{').append(((Persistent) value).getObjectId()).append('}');
  			} else if (value instanceof Collection) {
  				buffer.append("(..)");
  			} else if (value instanceof Fault) {
  				buffer.append('?');
  			} else {
  				buffer.append(value);
  			}
  
  			if (it.hasNext()) {
  				buffer.append("; ");
  			}
  		}
  
  		buffer.append("]");
  	}
  
  	/**
  	 * Serialization support.
  	 */
  	private void writeObject(ObjectOutputStream out) throws IOException {
  		writeSerialized(out);
  	}
  
  	/**
  	 * Serialization support.
  	 */
  	private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
  		readSerialized(in);
  		if(values == null) {
  			values = new HashMap<>();
  		}
  	}
  
  	@SuppressWarnings("unchecked")
  	@Override
  	protected void readState(ObjectInputStream in) throws IOException, ClassNotFoundException {
  		super.readState(in);
  		values = (Map<String, Object>) in.readObject();
  	}
  
  	@Override
  	protected void writeState(ObjectOutputStream out) throws IOException {
  		super.writeState(out);
  		out.writeObject(values);
  	}
  }
  