HistoryAsyncDAO.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 java.util.ArrayList;

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.ValueHistoryJS;
import org.sigmah.shared.command.GetHistory;
import org.sigmah.shared.command.result.ListResult;
import org.sigmah.shared.dto.history.HistoryTokenListDTO;

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 value history.
 * 
 * @author Raphaël Calabro (rcalabro@ideia.fr)
 */
@Singleton
public class HistoryAsyncDAO 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 GetHistory getHistory, final ListResult<HistoryTokenListDTO> historyResult) {
		openTransaction(Transaction.Mode.READ_WRITE, new OpenTransactionHandler<Store>() {

			@Override
			public void onTransaction(Transaction<Store> transaction) {
				saveOrUpdate(getHistory, historyResult, transaction);
			}
		});
	}

	public void saveOrUpdate(final GetHistory getHistory, final ListResult<HistoryTokenListDTO> historyResult, Transaction<Store> transaction) {
		final ObjectStore historyObjectStore = transaction.getObjectStore(Store.HISTORY);
		
		final ValueHistoryJS valueHistoryJS = ValueHistoryJS.toJavaScript(getHistory, historyResult);
		historyObjectStore.put(valueHistoryJS).addCallback(new AsyncCallback<Request>() {

            @Override
            public void onFailure(Throwable caught) {
                Log.error("Error while saving value history " + valueHistoryJS.getId() + ".", caught);
            }

            @Override
            public void onSuccess(Request result) {
                Log.trace("Value history " + valueHistoryJS.getId() + " has been successfully saved.");
            }
        });
	}
	
	public void get(final GetHistory getHistory, final AsyncCallback<ListResult<HistoryTokenListDTO>> callback) {
		get(ValueHistoryJS.toIdentifier(getHistory), callback);
	}
	
	public void get(final String id, final AsyncCallback<ListResult<HistoryTokenListDTO>> callback) {
		openTransaction(Transaction.Mode.READ_ONLY, new OpenTransactionHandler<Store>() {

			@Override
			public void onTransaction(Transaction<Store> transaction) {
				get(id, callback, transaction);
			}
		});
	}
	
	public void get(final String id, final AsyncCallback<ListResult<HistoryTokenListDTO>> callback, Transaction<Store> transaction) {
		final ObjectStore historyObjectStore = transaction.getObjectStore(Store.HISTORY);
		
		historyObjectStore.get(id).addCallback(new AsyncCallback<Request>() {

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

            @Override
            public void onSuccess(Request request) {
                final ValueHistoryJS valueHistoryJS = (ValueHistoryJS) request.getResult();
				if(valueHistoryJS != null) {
					callback.onSuccess(valueHistoryJS.toHistoryResult());
				} else {
					// No value has been saved for the requested element
					Log.warn("No value saved locally for id " + id);
					callback.onSuccess(new ListResult<HistoryTokenListDTO>(new ArrayList<HistoryTokenListDTO>()));
				}
            }
        });
	}

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