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   /*
    * Created on 04.03.2004
    */
   package org.xpcards.model;
   
   import java.io.Serializable;
   import java.util.Date;
   import java.util.Vector;
   
  /***
   * Base Domain Model Element
   * @author galu02
   */
  public class ModelElement implements Serializable, IIDProvider {
  
  	private ModelElement parent = null;
  	private String id = null;
  	private String name = null;
  	private String description = null;
  	private Vector listenersCache = null;
  	private Date created = null;
  	private String createdBy = null;
  
  	//	public ModelElement() {}
  	//	
  	//	public ModelElement(ModelElement parent) {
  	//		this.parent = parent;
  	//	}
  
  	/***
  	 * Root Element mainatains linsteners: all children delegates listener maintenance
  	 * @return
  	 */
  	Vector getListeners() {
  		if (parent != null) {
  			// System.err.println("From parent");
  			return parent.getListeners();
  		} else if (listenersCache != null) {
  			// System.err.println("Listeners cache");
  			return listenersCache;
  		} else {
  			// System.err.println("Create" + this);
  			listenersCache = new Vector();
  			return listenersCache;
  		}
  	}
  
  	public void addModelElementListener(IModelElementListener listener) {
  		// System.err.println("addModelElementListener:" + listener);
  		if (listener == null)
  			return;
  		Vector l = getListeners();
  		synchronized (l) {
  			if (!l.contains(listener)) {
  				l.add(listener);
  			}
  		};
  	}
  
  	public void removeModelElementListener(IModelElementListener listener) {
  		if (listener == null)
  			return;
  		Vector l = getListeners();
  		synchronized (l) {
  			l.remove(listener);
  		};
  	}
  
  	void fireModelElementPropertyChanged(String propertyName, Object oldValue, Object newValue) {
  		Vector l = getListeners();
  		synchronized (l) {
  			for (int i = 0; i < l.size(); i++) {
  				IModelElementListener ll = (IModelElementListener) l.elementAt(i);
  				ll.propertyChanged(this, propertyName, oldValue, newValue);
  			}
  		}
  	}
  
  	void fireCollectionElementAdded(ModelElement element, String collectionName, boolean recursive) {
  		fireCollectionElementAdded(this, element, collectionName, recursive);
  	}
  
  	void fireCollectionElementAdded(
  		ModelElement parent,
  		ModelElement element,
  		String collectionName,
  		boolean recursive) {
  		//		System.err.println(
  		//			"fireCollectionElementAdded:"
  		//				+ parent
  		//				+ ", "
  		//				+ element
  		//				+ ","
  		//				+ collectionName);
  		Vector l = getListeners();
  		synchronized (l) {
  			for (int i = 0; i < l.size(); i++) {
  				IModelElementListener ll = (IModelElementListener) l.elementAt(i);
  				ll.collectionElementAdded(element, parent, collectionName, recursive);
 			}
 		}
 	}
 
 	void fireCollectionElementRemoved(ModelElement element, String collectionName) {
 		fireCollectionElementRemoved(this, element, collectionName);
 	}
 
 	void fireCollectionElementRemoved(ModelElement parent, ModelElement element, String collectionName) {
 		Vector l = getListeners();
 		synchronized (l) {
 			for (int i = 0; i < l.size(); i++) {
 				IModelElementListener ll = (IModelElementListener) l.elementAt(i);
 				ll.collectionElementRemoved(element, parent, collectionName);
 			}
 		}
 	}
 
 	/***
 	 * @return
 	 */
 	public String getId() {
 		return id;
 	}
 
 	/***
 	 * @param string
 	 */
 	public void setId(String string) {
 		if (id != string) {
 			String old = id;
 			id = string;
 			fireModelElementPropertyChanged("description", old, id);
 		}
 	}
 
 	/***
 	 * @return
 	 */
 	public String getName() {
 		return name;
 	}
 
 	/***
 	 * @param string
 	 */
 	public void setName(String string) {
 		if (name != string) {
 			String old = name;
 			name = string;
 			fireModelElementPropertyChanged("description", old, name);
 		}
 	}
 
 	/***
 	 * @return
 	 */
 	public String getDescription() {
 		return description;
 	}
 
 	/***
 	 * @param string
 	 */
 	public void setDescription(String string) {
 		if (description != string) {
 			String old = description;
 			description = string;
 			fireModelElementPropertyChanged("description", old, description);
 		}
 	}
 
 	/***
 	 * @return
 	 */
 	public ModelElement getParent() {
 		return parent;
 	}
 
 	/***
 	 * @param element
 	 */
 	public void setParent(ModelElement element) {
 		parent = element;
 	}
 
 	public ModelElementCollection[] getChildrenCollections() {
 		return null;
 	}
 
 	/***
 	 * @return
 	 */
 	public Date getCreated() {
 		return created;
 	}
 
 	/***
 	 * @return
 	 */
 	public String getCreatedBy() {
 		return createdBy;
 	}
 
 	/***
 	 * @param date
 	 */
 	public void setCreated(Date date) {
 		created = date;
 	}
 
 	/***
 	 * @param string
 	 */
 	public void setCreatedBy(String string) {
 		createdBy = string;
 	}
 
 	/***
 	 * @see java.lang.Object#equals(java.lang.Object)
 	 */
 	public boolean equals(Object obj) {
 		if (obj instanceof ModelElement) {
 			ModelElement o = (ModelElement) obj;
 			if (getName() != o.getName()) {
 				return false;
 			}
 			if (getCreated() != o.getCreated()) {
 				return false;
 			}
 			if (getCreatedBy() != o.getCreatedBy()) {
 				return false;
 			}
 			if (getDescription() != o.getDescription()) {
 				return false;
 			}
 			if (getId() != o.getId()) {
 				return false;
 			}
 			return true;
 		}
 		return false;
 	}
 
 }