/*******************************************************************************
 * Copyright (c) 2004, 2007 Boeing.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Boeing - initial API and implementation
 *******************************************************************************/
package org.eclipse.osee.ote.core.model;

import java.io.Serializable;

/**
 * This key is used by the model manager to search for a model already instanciated for this environment. Each of the
 * getter functions MUST return a unique identifier for the specific model they represent ( or null if that particular
 * type isn't available).
 * 
 * @author Andrew M. Finkbeiner
 */
public class ModelKey<M extends IModel> implements Serializable, Comparable {
   private static final long serialVersionUID = 4735332847721441142L;
   private String className;
   private String name;
   private Class<M> modelClass;

   public ModelKey(String className) {
      this(className, null, null);
   }

   public ModelKey(ModelKey key) {
      this(key.className, key.name, null);
   }

   public ModelKey(Class<M> clazz) {
      this(clazz.getCanonicalName(), null, clazz);
   }

   public ModelKey(Class<M> clazz, String name) {
      this(clazz.getCanonicalName(), name, clazz);
   }

   public ModelKey(String className, String name, Class<M> modelClass) {
      this.className = className;
      this.name = name;
      this.modelClass = modelClass;
   }

   /**
    * return the instance class for the model specified by this key. This class MUST match for all keys specifying this
    * particular model.
    * 
    * @return The class for the model described by this key. This may be null if no class name is available but in this
    * case {@link #getClassName()} must NOT return null.
    */
   public Class<M> getModelClass() {
      return this.modelClass;
   }

   public void setModelClass(Class<M> modelClass) {
      this.modelClass = modelClass;
   }

   /**
    * return the name of the model specified by this key.
    * 
    * @return The name for the model described by this key
    */
   public String getName() {
      if (this.name == null) {
         this.name = this.getClassName().substring(this.getClassName().lastIndexOf(".") + 1);
      }
      return this.name;
   }

   /**
    * return the fully qualified class name for the model specified by this key. This class name MUST match for all keys
    * specifying this particular model.
    * 
    * @return The class name for the model described by this key. This may be null if no class name is available but in
    * this case {@link #getModelClass()} must NOT return null.
    */
   public String getClassName() {
      if (className != null) {
         return this.className;
      } else if (modelClass != null) {
         return modelClass.getCanonicalName();
      } else {
         return null;
      }
   }

   @Override
   public boolean equals(Object obj) {
      return getClassName().equals(((ModelKey) obj).getClassName());
   }

   @Override
   public int hashCode() {
      return getClassName().hashCode();
   }

   @Override
   public int compareTo(Object o) {
      if (!(o instanceof ModelKey)) {
         return -1;
      }

      ModelKey otherKey = (ModelKey) o;
      return this.getName().compareTo(otherKey.getName());
   }

   @Override
   public String toString() {
      return getClassName();
   }

}