EsCursorLoader.java

/**
 * galaxy inc.
 * meetup client for android
 */
package com.galaxy.meetup.client.android;

import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.support.v4.content.CursorLoader;
import android.util.Log;

/**
 * 
 * @author sihai
 *
 */
public class EsCursorLoader extends CursorLoader {

	private boolean mLoaderException;
    private final Uri mNotificationUri;
    private final android.support.v4.content.Loader.ForceLoadContentObserver mObserver;
    private boolean mObserverRegistered;
    
    public EsCursorLoader(Context context)
    {
        this(context, null);
    }

    public EsCursorLoader(Context context, Uri uri)
    {
        super(context);
        mObserver = new android.support.v4.content.Loader.ForceLoadContentObserver();
        mNotificationUri = uri;
    }

    public EsCursorLoader(Context context, Uri uri, String as[], String s, String as1[], String s1)
    {
        this(context, uri, as, s, as1, s1, null);
    }

    public EsCursorLoader(Context context, Uri uri, String as[], String s, String as1[], String s1, Uri uri1)
    {
        super(context, uri, as, s, as1, s1);
        mObserver = new android.support.v4.content.Loader.ForceLoadContentObserver();
        mNotificationUri = uri1;
    }

    public final void deliverResult(Cursor cursor) {
        boolean flag;
        if(cursor != null && cursor.isClosed())
            flag = true;
        else
            flag = false;
        if(mLoaderException || flag) {
        	if(flag)
                Log.w("EsCursorLoader", "Cursor was delivered closed.  This should never happen");
        } else { 
        	super.deliverResult(cursor);
        }
    }

    public Cursor esLoadInBackground()
    {
        return super.loadInBackground();
    }
    
    public final Cursor loadInBackground() {
    	Cursor cursor = null;
    	try {
    		cursor = esLoadInBackground();
    	} catch (Throwable throwable) {
    		Log.w("EsCursorLoader", "loadInBackground failed", throwable);
            mLoaderException = true;
            cursor = null;
    	}
    	return cursor;
    }

    protected void onAbandon()
    {
        if(mObserverRegistered)
        {
            getContext().getContentResolver().unregisterContentObserver(mObserver);
            mObserverRegistered = false;
        }
    }

    protected void onReset()
    {
        cancelLoad();
        super.onReset();
        onAbandon();
    }

    protected void onStartLoading()
    {
        super.onStartLoading();
        if(!mObserverRegistered && mNotificationUri != null)
        {
            getContext().getContentResolver().registerContentObserver(mNotificationUri, false, mObserver);
            mObserverRegistered = true;
        }
    }

    protected final void onStopLoading()
    {
    }
}