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Android example source code file (RegistrantList.java)

This example Android source code file (RegistrantList.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

android, arraylist, handler, object, os, registrant, registrantlist, throwable, util

The RegistrantList.java Android example source code

/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.os;

import android.os.Handler;         
import android.os.Message;         

import java.util.ArrayList;
import java.util.HashMap;

/** @hide */
public class RegistrantList
{
    ArrayList   registrants = new ArrayList();      // of Registrant

    public synchronized void
    add(Handler h, int what, Object obj)
    {
        add(new Registrant(h, what, obj));
    }

    public synchronized void
    addUnique(Handler h, int what, Object obj)
    {
        // if the handler is already in the registrant list, remove it
        remove(h);
        add(new Registrant(h, what, obj));        
    }
    
    public synchronized void
    add(Registrant r)
    {
        removeCleared();
        registrants.add(r);
    }

    public synchronized void
    removeCleared()
    {
        for (int i = registrants.size() - 1; i >= 0 ; i--) {
            Registrant  r = (Registrant) registrants.get(i);
            
            if (r.refH == null) {
                registrants.remove(i);
            }
        }
    }

    public synchronized int
    size()
    {
        return registrants.size();
    }

    public synchronized Object
    get(int index)
    {
        return registrants.get(index);
    }

    private synchronized void
    internalNotifyRegistrants (Object result, Throwable exception)
    {
       for (int i = 0, s = registrants.size(); i < s ; i++) {
            Registrant  r = (Registrant) registrants.get(i);
            r.internalNotifyRegistrant(result, exception);
       }
    }
    
    public /*synchronized*/ void
    notifyRegistrants()
    {
        internalNotifyRegistrants(null, null);
    }

    public /*synchronized*/ void
    notifyException(Throwable exception)
    {
        internalNotifyRegistrants (null, exception);
    }

    public /*synchronized*/ void
    notifyResult(Object result)
    {
        internalNotifyRegistrants (result, null);
    }

    
    public /*synchronized*/ void
    notifyRegistrants(AsyncResult ar)
    {
        internalNotifyRegistrants(ar.result, ar.exception);
    }
    
    public synchronized void
    remove(Handler h)
    {
        for (int i = 0, s = registrants.size() ; i < s ; i++) {
            Registrant  r = (Registrant) registrants.get(i);
            Handler     rh;

            rh = r.getHandler();

            /* Clean up both the requested registrant and
             * any now-collected registrants
             */
            if (rh == null || rh == h) {
                r.clear();
            }
        }

        removeCleared();
    }
}

Other Android examples (source code examples)

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