Java tutorial
/* * This file is part of the PDF Split And Merge source code * Created on 30/apr/2014 * Copyright 2013-2014 by Andrea Vacondio (andrea.vacondio@gmail.com). * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero 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 Affero General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package org.pdfsam.update; import static org.apache.commons.lang3.StringUtils.EMPTY; import java.io.IOException; import javax.inject.Inject; import javax.inject.Named; import org.pdfsam.i18n.DefaultI18nContext; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import com.fasterxml.jackson.jr.ob.JSON; /** * Default JSON implementation for the update service * * @author Andrea Vacondio * */ @Named class DefaultUpdateService implements UpdateService { private static final Logger LOG = LoggerFactory.getLogger(DefaultUpdateService.class); private static final String CURRENT_VERSION_KEY = "currentVersion"; private Object jsonSource; @Inject DefaultUpdateService(@Named("updatesUrl") Object jsonSource) { this.jsonSource = jsonSource; } public String getLatestVersion() { try { return JSON.std.mapFrom(jsonSource).getOrDefault(CURRENT_VERSION_KEY, "").toString(); } catch (IOException e) { LOG.warn(DefaultI18nContext.getInstance().i18n("Unable to find the latest available version."), e); } return EMPTY; } }