PageAccessAsyncDAO.java

package org.sigmah.offline.dao;

/*
 * #%L
 * Sigmah
 * %%
 * Copyright (C) 2010 - 2016 URD
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/gpl-3.0.html>.
 * #L%
 */

import org.sigmah.client.page.Page;
import org.sigmah.offline.indexeddb.ObjectStore;
import org.sigmah.offline.indexeddb.Request;
import org.sigmah.offline.indexeddb.Store;
import org.sigmah.offline.indexeddb.Transaction;
import org.sigmah.offline.js.PageAccessJS;

import com.allen_sauer.gwt.log.client.Log;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.inject.Singleton;
import org.sigmah.offline.indexeddb.IndexedDB;
import org.sigmah.offline.indexeddb.OpenDatabaseRequest;

/**
 * Asynchronous DAO for saving and loading the page accesses rights.
 * 
 * @author Raphaël Calabro (rcalabro@ideia.fr)
 */
@Singleton
public class PageAccessAsyncDAO extends BaseAsyncDAO<Store> {

	/**
	 * {@inheritDoc}
	 */
	@Override
	public OpenDatabaseRequest<Store> openDatabase() {
		return IndexedDB.openUserDatabase(getAuthentication());
	}
	
	/**
	 * {@inheritDoc}
	 */
	@Override
	public Class<Store> getSchema() {
		return Store.class;
	}
	
	public void saveOrUpdate(final PageAccessJS pageAccessJS) {
		openTransaction(Transaction.Mode.READ_WRITE, new OpenTransactionHandler<Store>() {

			@Override
			public void onTransaction(Transaction<Store> transaction) {
				saveOrUpdate(pageAccessJS, transaction);
			}
		});
	}
	
	public void saveOrUpdate(final PageAccessJS pageAccessJS, Transaction<Store> transaction) {
		final ObjectStore objectStore = transaction.getObjectStore(Store.PAGE_ACCESS);
		
		objectStore.put(pageAccessJS).addCallback(new AsyncCallback<Request>() {

            @Override
            public void onFailure(Throwable caught) {
                Log.error("Error while saving access right for page " + pageAccessJS.getPage() + ".", caught);
            }

            @Override
            public void onSuccess(Request result) {
                Log.trace("Access right for page  " + pageAccessJS.getPage() + " has been successfully saved.");
            }
        });
	}

	public void get(final Page page, final AsyncCallback<PageAccessJS> callback) {
		openTransaction(Transaction.Mode.READ_ONLY, new OpenTransactionHandler<Store>() {

			@Override
			public void onTransaction(Transaction<Store> transaction) {
				get(page, callback, transaction);
			}
		});
	}
	
	public void get(final Page page, final AsyncCallback<PageAccessJS> callback, Transaction<Store> transaction) {
		final ObjectStore objectStore = transaction.getObjectStore(Store.PAGE_ACCESS);
		
		objectStore.get(page.name()).addCallback(new AsyncCallback<Request>() {

            @Override
            public void onFailure(Throwable caught) {
                callback.onFailure(caught);
            }

            @Override
            public void onSuccess(Request request) {
                final PageAccessJS pageAccessJS = request.getResult();
				
				if(pageAccessJS != null) {
					callback.onSuccess(pageAccessJS);
				} else {
					Log.warn("No access right was saved locally for page " + page);
					callback.onSuccess(PageAccessJS.createPageAccessJS(page, false));
				}
            }
        });
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public Store getRequiredStore() {
		return Store.PAGE_ACCESS;
	}
	
}