package org.apidesign.component;

import java.util.Iterator;

import org.junit.BeforeClass;

import org.junit.Test;

import org.netbeans.junit.MockServices;

import org.openide.util.Lookup;

import static org.junit.Assert.*;

import org.openide.util.Lookup.Result;

import org.openide.util.LookupEvent;

import org.openide.util.LookupListener;

public class InjectionSlotChangesTest {

    public InjectionSlotChangesTest() {

    }

    @BeforeClass

    public static void setUpClass() throws Exception {

        // this is a support for "dynamic" registration of any class

        // into the global pool of Lookup.getDefault() and java.util.ServiceLoader

        // either in @BeforeClass or @Before register 

        // classes of the mock instances that you want your code 

        // to find

        MockServices.setServices(ImplOne.class, ImplTwo.class);

    }

    @Test

    public void multiSlot() {

        Iterator<? extends InjectionSlot> it = InjectionSlot.multiSlot().iterator();

        assertTrue("Has at least one", it.hasNext());

        assertEquals("The first is ImplOne", ImplOne.class, it.next().getClass());

        assertTrue("Has two", it.hasNext());

        assertEquals("The second is ImplTwo", ImplTwo.class, it.next().getClass());

        assertFalse("No other instance registered", it.hasNext());

        // BEGIN: lookup.listener

        class Listener implements LookupListener {

            int cnt;

            public void resultChanged(LookupEvent arg0) {

                cnt++;

            }

        }

        Listener listener = new Listener();

        Lookup.Result<InjectionSlot> res = 

            Lookup.getDefault().lookupResult(InjectionSlot.class);

        res.addLookupListener(listener);

        assertEquals("Two services now", 2, res.allInstances().size());

        MockServices.setServices(ImplTwo.class);

        assertEquals("One service only", 1, res.allInstances().size());

        assertEquals("One change in listener", 1, listener.cnt);

        assertEquals(

            "The second is ImplTwo", 

            ImplTwo.class, 

            res.allInstances().iterator().next().getClass()

        );

        // END: lookup.listener

    }

    public static final class ImplOne extends InjectionSlot {

    }

    public static final class ImplTwo extends InjectionSlot {

    }

}