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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    * 
    9    *     http://www.apache.org/licenses/LICENSE-2.0
   10    * 
   11    * Unless required by applicable law or agreed to in writing, software 
   12    * distributed under the License is distributed on an "AS IS" BASIS, 
   13    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
   14    * See the License for the specific language governing permissions and 
   15    * limitations under the License.
   16    */
   17   
   18   package org.apache.jdo.impl.model.jdo;
   19   
   20   import java.util.List;
   21   import java.util.ArrayList;
   22   import java.beans.PropertyChangeListener;
   23   import java.beans.PropertyChangeSupport;
   24   import java.beans.PropertyVetoException;
   25   import java.beans.VetoableChangeListener;
   26   import java.beans.VetoableChangeSupport;
   27   
   28   import org.apache.jdo.model.jdo.JDOElement;
   29   import org.apache.jdo.model.jdo.JDOExtension;
   30   
   31   /**
   32    * This is the super interface for JDO metadata elements, 
   33    * such as JDOClass, JDOField and JDORelationship.
   34    *
   35    * @author Michael Bouschen
   36    */
   37   public class JDOElementImpl
   38       implements JDOElement
   39   {
   40       /** List of vendorExtensions. */
   41       private List vendorExtensions = new ArrayList();
   42   
   43       /** Property change support. */
   44       private transient PropertyChangeSupport propertyChangeSupport;
   45   
   46       /** Vetoable change support. */
   47       private transient VetoableChangeSupport vetoableChangeSupport;
   48   
   49       /**
   50        * Remove the supplied vendor extension from the collection of extensions 
   51        * maintained by this JDOElement.
   52        */
   53       public void removeJDOExtension(JDOExtension vendorExtension)
   54       {
   55           vendorExtensions.remove(vendorExtension);
   56       }
   57   
   58       /**
   59        * Returns the collection of vendor extensions for this JDOElement
   60        * in the form of an array.
   61        * @return the vendor extensions for this JDOClass
   62        */
   63       public JDOExtension[] getJDOExtensions()
   64       {
   65           return (JDOExtension[])vendorExtensions.toArray(
   66               new JDOExtension[vendorExtensions.size()]);
   67       }
   68   
   69       /**
   70        * Creates a new JDOExtension instance and attaches it to the specified 
   71        * JDOElement object.
   72        */
   73       public JDOExtension createJDOExtension()
   74       {
   75           JDOExtension jdoExtension = new JDOExtensionImpl();
   76           vendorExtensions.add(jdoExtension);
   77           return jdoExtension;
   78       }
   79   
   80       /** 
   81        * Fires property change event.
   82        * @param name property name
   83        * @param o old value
   84        * @param n new value
   85        */
   86       protected void firePropertyChange (String name, Object o, Object n)
   87       {
   88           if (propertyChangeSupport != null) {
   89               propertyChangeSupport.firePropertyChange(name, o, n);
   90           }
   91       }
   92   
   93       /** 
   94        * Add a property change listener.
   95        * @param l the listener to add
   96        */
   97       public synchronized void addPropertyChangeListener (PropertyChangeListener l)
   98       {
   99           if (propertyChangeSupport == null) {
  100               propertyChangeSupport = new PropertyChangeSupport(this);
  101           }
  102           propertyChangeSupport.addPropertyChangeListener(l);
  103       }
  104   
  105       /** 
  106        * Remove a property change listener.
  107        * @param l the listener to remove
  108        */
  109       public synchronized void removePropertyChangeListener(PropertyChangeListener l)
  110       {
  111           if (propertyChangeSupport != null) {
  112               propertyChangeSupport.removePropertyChangeListener(l);
  113           }
  114       }
  115   
  116       /** Fires vetoable change event.
  117        * @param name property name
  118        * @param o old value
  119        * @param n new value
  120        * @exception PropertyVetoException when the change is vetoed by a listener
  121        */
  122       protected void fireVetoableChange (String name, Object o, Object n)
  123           throws PropertyVetoException
  124       {
  125           if (vetoableChangeSupport != null) {
  126               vetoableChangeSupport.fireVetoableChange(name, o, n);
  127           }
  128       }
  129   
  130       /** 
  131        * Add a vetoable change listener.
  132        * @param l the listener to add
  133        */
  134       public void addVetoableChangeListener(VetoableChangeListener l)
  135       {
  136           if (vetoableChangeSupport == null) {
  137               vetoableChangeSupport = new VetoableChangeSupport(this);
  138           }
  139           vetoableChangeSupport.addVetoableChangeListener(l);
  140       }
  141   
  142       /** 
  143        * Remove a vetoable change listener.
  144        * @param l the listener to remove
  145        */
  146       public void removeVetoableChangeListener(VetoableChangeListener l)
  147       {
  148           if (vetoableChangeSupport != null) {
  149               vetoableChangeSupport.removeVetoableChangeListener(l);
  150           }
  151           
  152       }
  153   }

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