package org.apidesign.javamonitorflaws;

 import org.apidesign.javamonitorflaws.Cache;

 import java.beans.PropertyChangeListener;

 import java.beans.PropertyChangeSupport;

 /**

  *

  * @author Jaroslav Tulach <jtulach@netbeans.org>

  */

 // BEGIN: monitor.pitfalls.subclass

 public class MultiplyCache extends Cache<String,Integer> {

     private PropertyChangeSupport pcs;

     private int multiply;

     public static final String PROP_MULTIPLY = "multiply";

     public synchronized int getMultiply() {

         return multiply;

     }

     public synchronized void setMultiply(int multiply) {

         int oldMultiply = this.multiply;

         this.multiply = multiply;

         pcs.firePropertyChange(PROP_MULTIPLY, oldMultiply, multiply);

     }

     public synchronized void addPropertyChangeListener(PropertyChangeListener listener) {

         if (pcs == null) {

             pcs = new PropertyChangeSupport(this);

         }

         pcs.addPropertyChangeListener(listener);

     }

     public synchronized void removePropertyChangeListener(PropertyChangeListener listener) {

         if (pcs != null) {

             pcs.removePropertyChangeListener(listener);

         }

     }

     @Override

     protected Integer createItem(String f) {

         return f.length() * getMultiply();

     }

 }

 // END: monitor.pitfalls.subclass