/**
 *******************************************************************************
 * Copyright (C) 2001-2004, International Business Machines Corporation and    *
 * others. All Rights Reserved.                                                *
 *******************************************************************************
 */
package com.ibm.icu.dev.test.util;

import com.ibm.icu.impl.ICULocaleService;
import com.ibm.icu.impl.ICUService;
import com.ibm.icu.impl.LocaleUtility;
import com.ibm.icu.text.Collator;

import java.util.EventListener;
import java.util.Iterator;
import java.util.Locale;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.SortedMap;

public class ICUServiceTestSample {
    static public void main(String[] args) {
	HelloServiceClient client = new HelloServiceClient();

	Thread t = new HelloUpdateThread();
	t.start();
	try {
	    t.join();
	}
	catch (InterruptedException e) {
	}
	System.out.println("done");
     if(client==null){
     }
    }

    /**
     * A class that displays the current names in the Hello service.
     * Each time the service changes, it redisplays the names.
     */
    static class HelloServiceClient implements HelloService.HelloServiceListener {

	HelloServiceClient() {
	    HelloService.addListener(this);
	    display();
	}


	/**
	 * This will be called in the notification thread of
	 * ICUNotifier.  ICUNotifier could spawn a (non-daemon) thread
	 * for each listener, so that impolite listeners wouldn't hold
	 * up notification, but right now it doesn't.  Instead, all
	 * notifications are delivered on the notification thread.
	 * Since that's a daemon thread, a notification might not
	 * complete before main terminates.  
	 */
	public void helloServiceChanged() {
	    display();
	}

	private void display() {
	    Map names = HelloService.getDisplayNames(Locale.US);
	    System.out.println("displaying " + names.size() + " names.");
	    Iterator iter = names.entrySet().iterator();
	    while (iter.hasNext()) {
		Entry entry = (Entry)iter.next();
		String displayName = (String)entry.getKey();
		HelloService service = HelloService.get((String)entry.getValue());
		System.out.println(displayName + " says " + service.hello());
		try {
		    Thread.sleep(50);
		}
		catch (InterruptedException e) {
		}
	    }
	    System.out.println("----");
	}
    }

    /**
     * A thread to update the service.
     */
    static class HelloUpdateThread extends Thread {
	String[][] updates = {
	    { "Hey", "en_US_INFORMAL" },
	    { "Hallo", "de_DE_INFORMAL" },
	    { "Yo!", "en_US_CALIFORNIA_INFORMAL" },
	    { "Chi Fanle Ma?", "zh__INFORMAL" },
	    { "Munch munch... Burger?", "en" },
	    { "Sniff", "fr" },
	    { "TongZhi! MaoZeDong SiXiang Wan Sui!", "zh_CN" },
	    { "Bier? Ja!", "de" },
	};
	public void run() {
	    for (int i = 0; i < updates.length; ++i) {
		try {
		    Thread.sleep(500);
		}
		catch (InterruptedException e) {
		}
		HelloService.register(updates[i][0], LocaleUtility.getLocaleFromName(updates[i][1]));
	    }
	}
    }

    /**
     * An example service that wraps an ICU service in order to export custom API and
     * notification. The service just implements 'hello'.
     */
    static final class HelloService {
    	private static ICUService registry;
    	private String name;
    
    	private HelloService(String name) { 
    	    this.name = name; 
    	}
    
    	/**
    	 * The hello service...
    	 */
    	public String hello() { 
    	    return name; 
    	}
    	
    	public String toString() { 
    	    return super.toString() + ": " + name; 
    	}
    
    	/**
    	 * Deferred init.
    	 */
    	private static ICUService registry() {
    	    if (registry == null) {
    		initRegistry();
    	    }
    	    return registry;
    	}
    
    	private static void initRegistry() {
    	    registry = new ICULocaleService() {
    		    protected boolean acceptsListener(EventListener l) {
    			return true; // we already verify in our wrapper APIs
    		    }
    		    protected void notifyListener(EventListener l) {
    			((HelloServiceListener)l).helloServiceChanged();
    		    }
    		};
    
    	    // initialize
    	    doRegister("Hello", "en");
    	    doRegister("Bonjour", "fr");
    	    doRegister("Ni Hao", "zh_CN");
    	    doRegister("Guten Tag", "de");
    	}
    
    	/**
    	 * A custom listener for changes to this service.  We don't need to
    	 * point to the service since it is defined by this class and not
    	 * an object.
    	 */
    	public static interface HelloServiceListener extends EventListener {
    	    public void helloServiceChanged();
    	}
    
    	/**
    	 * Type-safe notification for this service.
    	 */
    	public static void addListener(HelloServiceListener l) {
    	    registry().addListener(l);
    	}
    
    	/**
    	 * Type-safe notification for this service.
    	 */
    	public static void removeListener(HelloServiceListener l) {
    	    registry().removeListener(l);
    	}
    
    	/**
    	 * Type-safe access to the service.
    	 */
    	public static HelloService get(String id) {
    	    return (HelloService)registry().get(id);
    	}
    
    	public static Set getVisibleIDs() {
    	    return registry().getVisibleIDs();
    	}
    
    	public static Map getDisplayNames(Locale locale) {
    	    return getDisplayNames(registry(),locale);
    	}
    
    	/**
    	 * Register a new hello string for this locale.
    	 */
    	public static void register(String helloString, Locale locale) {
    	    if (helloString == null || locale == null) {
    		throw new NullPointerException();
    	    }
    	    doRegister(helloString, LocaleUtility.canonicalLocaleString(locale.toString()));
    	}
    
    	private static void doRegister(String hello, String id) {
    	    registry().registerObject(new HelloService(hello), id);
    	}
    	/**
         * Convenience override of getDisplayNames(Locale, Comparator, String) that
         * uses the default collator for the locale as the comparator to
         * sort the display names, and null for the matchID.
         */
        public static SortedMap getDisplayNames(ICUService service, Locale locale) {
            Collator col = Collator.getInstance(locale);
            return service.getDisplayNames(locale, col, null);
        }
    }
}