Conversations.java :  » UnTagged » androidgin » person » bangbang » im » Androidgin » Framework » Android Open Source

package person.bangbang.im.Androidgin.Framework;

import java.util.ArrayList;
import java.util.List;

import person.bangbang.im.Androidgin.Util.Log;


/**
 * all chats we take participate in, 
 * whatever account, whatever group.
 * 
 * one to one chat only.
 */
public class Conversations {
  private static final String TAG = "Androidgin.Chats";
  
  // TODO remove this field, should 
  // independently with Android-specific
  // DONE it doesn't matter, just a name-war.
  /* whenever new a chat increase this by 1 */
  private int _notifyId = 0;
  
  private static Conversations _instance;
  
  private List<Conversation> mList = new ArrayList<Conversation>();
  
  private List<OnConversationsEvent> mListener = new ArrayList<OnConversationsEvent>();
  
  private Conversations(){
    
  }
  
  public static Conversations getInstance(){
    if (null == _instance) {
      _instance = new Conversations();
    }
    
    return _instance;
  }
  
  protected void addConversation(Conversation c) {
    if (null == c) {
      return;
    }
    mList.add(c);
  }
  public void removeConversation(Conversation c) {
    for (OnConversationsEvent e : mListener) {
      e.onDelete(c);
    }
    
    mList.remove(c);

  }
  
  /**
   * if there is no one, create it.
   * @param b
   * @return
   */
  public Conversation getOrNewConversation(Buddy b) {

    
    for (Conversation c : mList) {
      if (Conversation.TYPE_IM == c.getType()) { // not a room chatting, always in zero positon.
        if (c.getPartners().get(0).getID() == b.getID()) {
          return c;
        }
      } else {
        throw new RuntimeException("unImplements..");
      }
    }
    
    Log.d(TAG, "create a chat with buddy: " + b.getID());
    /* ++i VS i++ */
    Conversation c = new Conversation(b, ++_notifyId);
    addConversation(c);
    
    for (OnConversationsEvent e : mListener) {
      e.onNew(c);
    }
    
    return c;
  }
  
  /**
   * find chat with which you talk.
   * 
   * @param partner
   * @return
   */
  public Conversation findConversation(Buddy partner) {
    for (Conversation cc : mList) {
      if (Conversation.TYPE_IM == cc.getType()) {
        if (cc.getPartners().get(0).equals(partner)) {
          return cc;
        } 
      } else {
        throw new RuntimeException("un implements");
      }
    }
    
    return null;
  }

  
  public void regOnConversationsListener(OnConversationsEvent l) {
    mListener.add(l);
  }
  public void unRegOnConversationsListener(OnConversationsEvent l) {
    mListener.remove(l);
  }
  
  
  public interface OnConversationsEvent{
    public void onNew(Conversation c);
    public void onDelete(Conversation c);
    
  }
    
}