Java tutorial
/* * Copyright 2015 Institute of Information Systems, Hof University * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * under the License. */ package org.apache.shindig.social.websockbackend.spi; import java.util.ArrayList; import java.util.List; import java.util.Map; import java.util.Set; import java.util.concurrent.Future; import java.util.logging.Level; import java.util.logging.Logger; import javax.servlet.http.HttpServletResponse; import org.apache.shindig.auth.SecurityToken; import org.apache.shindig.protocol.ProtocolException; import org.apache.shindig.protocol.RestfulCollection; import org.apache.shindig.social.opensocial.model.Name; import org.apache.shindig.social.opensocial.model.Person; import org.apache.shindig.social.opensocial.spi.CollectionOptions; import org.apache.shindig.social.opensocial.spi.UserId; import org.apache.shindig.social.websockbackend.model.dto.PersonDTO; import org.apache.shindig.social.websockbackend.util.CollOptsConverter; import com.google.common.util.concurrent.Futures; import com.google.inject.Inject; import de.hofuniversity.iisys.neo4j.websock.queries.IQueryCallback; import de.hofuniversity.iisys.neo4j.websock.queries.IQueryHandler; import de.hofuniversity.iisys.neo4j.websock.query.EQueryType; import de.hofuniversity.iisys.neo4j.websock.query.WebsockQuery; import de.hofuniversity.iisys.neo4j.websock.result.ListResult; import de.hofuniversity.iisys.neo4j.websock.shindig.ShindigNativeQueries; /** * Neo4j over websocket implementation for the friendship service. */ public class WsNativeFriendSPI implements IFriendService { private static final String NAME_FIELD = Person.Field.NAME.toString(); private static final String FORMATTED_FIELD = Name.Field.FORMATTED.toString(); private final IQueryHandler fQueryHandler; private final Logger fLogger; /** * Creates a friendship service using the given query handler to dispatch queries to a remote * server. * * @param qHandler * query handler to use */ @Inject public WsNativeFriendSPI(IQueryHandler qHandler) { if (qHandler == null) { throw new NullPointerException("query handler was null"); } this.fQueryHandler = qHandler; this.fLogger = Logger.getLogger(this.getClass().getName()); } @Override public Future<RestfulCollection<Person>> getRequests(UserId userId, CollectionOptions collectionOptions, Set<String> fields, final SecurityToken token) { final List<Person> personList = new ArrayList<Person>(); final String sortField = collectionOptions.getSortBy(); if (sortField == null || sortField.equals(WsNativeFriendSPI.NAME_FIELD)) { collectionOptions.setSortBy(WsNativeFriendSPI.FORMATTED_FIELD); } // create query final WebsockQuery query = new WebsockQuery(EQueryType.PROCEDURE_CALL); query.setPayload(ShindigNativeQueries.GET_FRIEND_REQUESTS_QUERY); // set collection options CollOptsConverter.convert(collectionOptions, query); // set parameters for method query.setParameter(ShindigNativeQueries.USER_ID, userId.getUserId(token)); if (fields != null) { final List<String> fieldList = new ArrayList<String>(fields); query.setParameter(ShindigNativeQueries.FIELD_LIST, fieldList); } final IQueryCallback callback = this.fQueryHandler.sendQuery(query); ListResult result = null; try { result = (ListResult) callback.get(); } catch (final Exception e) { e.printStackTrace(); this.fLogger.log(Level.SEVERE, "server error", e); throw new ProtocolException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "could not retrieve results", e); } @SuppressWarnings("unchecked") final List<Map<String, Object>> mapList = (List<Map<String, Object>>) result.getResults(); if (mapList != null) { String id = null; PersonDTO tmpPerson = null; for (final Map<String, Object> persMap : mapList) { tmpPerson = new PersonDTO(persMap); id = tmpPerson.getId(); // determine whether the person is viewer or owner if (token != null) { if (id.equals(token.getViewerId())) { tmpPerson.setIsViewer(true); } if (id.equals(token.getOwnerId())) { tmpPerson.setIsOwner(true); } } personList.add(tmpPerson); } } // return search query information final RestfulCollection<Person> people = new RestfulCollection<Person>(personList); people.setItemsPerPage(result.getMax()); people.setStartIndex(result.getFirst()); people.setTotalResults(result.getTotal()); return Futures.immediateFuture(people); } @Override public Future<Void> requestFriendship(UserId userId, Person target, SecurityToken token) { // create query final WebsockQuery query = new WebsockQuery(EQueryType.PROCEDURE_CALL); query.setPayload(ShindigNativeQueries.REQUEST_FRIENDSHIP_QUERY); // set parameters for method query.setParameter(ShindigNativeQueries.USER_ID, userId.getUserId(token)); query.setParameter(ShindigNativeQueries.TARGET_USER_ID, target.getId()); try { this.fQueryHandler.sendQuery(query).get(); } catch (final Exception e) { e.printStackTrace(); this.fLogger.log(Level.SEVERE, "server error", e); throw new ProtocolException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "could not request or confirm friendship", e); } return Futures.immediateFuture(null); } @Override public Future<Void> denyFriendship(UserId userId, Person target, SecurityToken token) { // create query final WebsockQuery query = new WebsockQuery(EQueryType.PROCEDURE_CALL); query.setPayload(ShindigNativeQueries.DENY_FRIENDSHIP_QUERY); // set parameters for method query.setParameter(ShindigNativeQueries.USER_ID, userId.getUserId(token)); query.setParameter(ShindigNativeQueries.TARGET_USER_ID, target.getId()); try { this.fQueryHandler.sendQuery(query).get(); } catch (final Exception e) { e.printStackTrace(); this.fLogger.log(Level.SEVERE, "server error", e); throw new ProtocolException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "could not deny or revoke friendship", e); } return Futures.immediateFuture(null); } }