jtulach@348: package org.apidesign.stateful.api;
jtulach@348: 
jtulach@348: /** API for notifying progress.
jtulach@348:  *
jtulach@348:  * @author Jaroslav Tulach <jtulach@netbeans.org>
jtulach@348:  */
jtulach@348: // BEGIN: progress.api
jtulach@350: public abstract class ProgressStateful {
jtulach@350:     public static ProgressStateful create(String name) {
jtulach@348:         return createImpl(name);
jtulach@348:     }
jtulach@348:     public abstract void start(int totalAmount);
jtulach@348:     public abstract void progress(int howMuch);
jtulach@348:     public abstract void finish();
jtulach@348:     // FINISH: progress.api
jtulach@348: 
jtulach@350:     ProgressStateful() {
jtulach@348:     }
jtulach@348:     
jtulach@350:     private static ProgressStateful createImpl(String name) {
jtulach@348:         return new Impl(name);
jtulach@348:     }
jtulach@348: 
jtulach@350:     private static final class Impl extends ProgressStateful {
jtulach@348:         private final String name;
jtulach@348:         private int total = -1;
jtulach@348:         private int current;
jtulach@348: 
jtulach@348:         public Impl(String name) {
jtulach@348:             this.name = name;
jtulach@348:         }
jtulach@348: 
jtulach@348:         @Override
jtulach@348:         public void start(int totalAmount) {
jtulach@348:             total = totalAmount;
jtulach@348:         }
jtulach@348: 
jtulach@348:         @Override
jtulach@348:         public void progress(int howMuch) {
jtulach@348:             if (total == -1) {
jtulach@348:                 throw new IllegalStateException("Call start first!");
jtulach@348:             }
jtulach@348:             current = howMuch;
jtulach@348:         }
jtulach@348: 
jtulach@348:         @Override
jtulach@348:         public void finish() {
jtulach@348:             total = -1;
jtulach@348:             current = 0;
jtulach@348:         }
jtulach@348: 
jtulach@348:     }
jtulach@348: }