/*
* Copyright 2011, Nabil Benothman, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package com.ubike.rest.service;
import com.ubike.model.TripSegment;
import javax.ws.rs.Path;
import javax.ws.rs.GET;
import javax.ws.rs.PUT;
import javax.ws.rs.DELETE;
import javax.ws.rs.Produces;
import javax.ws.rs.Consumes;
import javax.ws.rs.QueryParam;
import javax.ws.rs.DefaultValue;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.UriInfo;
import com.sun.jersey.api.core.ResourceContext;
import javax.ws.rs.WebApplicationException;
import javax.persistence.NoResultException;
import javax.persistence.EntityManager;
import com.ubike.model.GpsFile;
import com.ubike.model.Trip;
import com.ubike.rest.converter.TripSegmentConverter;
import javax.ejb.Stateless;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;
/**
* {@code TripSegmentResource}
* <p></p>
*
* Created on Jun 6, 2011 at 7:17:22 PM
*
* @author <a href="mailto:nabil.benothman@gmail.com">Nabil Benothman</a>
*/
@Stateless
@Component
@Scope("request")
public class TripSegmentResource {
@Context
protected UriInfo uriInfo;
@Context
protected ResourceContext resourceContext;
protected Long id;
/** Creates a new instance of TripSegmentResource */
public TripSegmentResource() {
}
public void setId(Long id) {
this.id = id;
}
/**
* Get method for retrieving an instance of TripSegment identified by id in XML format.
*
* @param id identifier for the entity
* @return an instance of TripSegmentConverter
*/
@GET
@Produces({"application/xml", "application/json"})
public TripSegmentConverter get(@QueryParam("expandLevel")
@DefaultValue("1") int expandLevel) {
PersistenceService persistenceSvc = PersistenceService.getInstance();
try {
persistenceSvc.beginTx();
return new TripSegmentConverter(getEntity(),
uriInfo.getAbsolutePath(), expandLevel);
} finally {
PersistenceService.getInstance().close();
}
}
/**
* Put method for updating an instance of TripSegment identified by id using XML as the input format.
*
* @param id identifier for the entity
* @param data an TripSegmentConverter entity that is deserialized from a XML stream
*/
@PUT
@Consumes({"application/xml", "application/json"})
public void put(TripSegmentConverter data) {
PersistenceService persistenceSvc = PersistenceService.getInstance();
try {
persistenceSvc.beginTx();
EntityManager em = persistenceSvc.getEntityManager();
updateEntity(getEntity(), data.resolveEntity(em));
persistenceSvc.commitTx();
} finally {
persistenceSvc.close();
}
}
/**
* Delete method for deleting an instance of TripSegment identified by id.
*
* @param id identifier for the entity
*/
@DELETE
public void delete() {
PersistenceService persistenceSvc = PersistenceService.getInstance();
try {
persistenceSvc.beginTx();
deleteEntity(getEntity());
persistenceSvc.commitTx();
} finally {
persistenceSvc.close();
}
}
/**
* Returns an instance of TripSegment identified by id.
*
* @param id identifier for the entity
* @return an instance of TripSegment
*/
protected TripSegment getEntity() {
EntityManager em = PersistenceService.getInstance().getEntityManager();
try {
return (TripSegment) em.createQuery("SELECT e FROM TripSegment e where e.id = :id").setParameter("id",
id).getSingleResult();
} catch (NoResultException ex) {
throw new WebApplicationException(new Throwable("Resource for " + uriInfo.getAbsolutePath() + " does not exist."),
404);
}
}
/**
* Updates entity using data from newEntity.
*
* @param entity the entity to update
* @param newEntity the entity containing the new data
* @return the updated entity
*/
protected TripSegment updateEntity(TripSegment entity, TripSegment newEntity) {
EntityManager em = PersistenceService.getInstance().getEntityManager();
GpsFile gpsFile = entity.getGpsFile();
GpsFile gpsFileNew = newEntity.getGpsFile();
Trip trip = entity.getTrip();
Trip tripNew = newEntity.getTrip();
entity = em.merge(newEntity);
if (gpsFile != null && !gpsFile.equals(gpsFileNew)) {
gpsFile.getSegments().remove(entity);
}
if (gpsFileNew != null && !gpsFileNew.equals(gpsFile)) {
gpsFileNew.getSegments().add(entity);
}
if (trip != null && !trip.equals(tripNew)) {
trip.getSegments().remove(entity);
}
if (tripNew != null && !tripNew.equals(trip)) {
tripNew.getSegments().add(entity);
}
return entity;
}
/**
* Deletes the entity.
*
* @param entity the entity to deletle
*/
protected void deleteEntity(TripSegment entity) {
EntityManager em = PersistenceService.getInstance().getEntityManager();
GpsFile gpsFile = entity.getGpsFile();
if (gpsFile != null) {
gpsFile.getSegments().remove(entity);
}
Trip trip = entity.getTrip();
if (trip != null) {
trip.getSegments().remove(entity);
}
em.remove(entity);
}
/**
* Returns a dynamic instance of GpsFileResource used for entity navigation.
*
* @param id identifier for the parent entity
* @return an instance of GpsFileResource
*/
@Path("gpsFile/")
public GpsFileResource getGpsFileResource() {
GpsFileResourceSub resource = resourceContext.getResource(GpsFileResourceSub.class);
resource.setParent(getEntity());
return resource;
}
/**
* Returns a dynamic instance of TripResource used for entity navigation.
*
* @param id identifier for the parent entity
* @return an instance of TripResource
*/
@Path("trip/")
public TripResource getTripResource() {
TripResourceSub resource = resourceContext.getResource(TripResourceSub.class);
resource.setParent(getEntity());
return resource;
}
public static class GpsFileResourceSub extends GpsFileResource {
private TripSegment parent;
public void setParent(TripSegment parent) {
this.parent = parent;
}
@Override
protected GpsFile getEntity() {
GpsFile entity = parent.getGpsFile();
if (entity == null) {
throw new WebApplicationException(new Throwable("Resource for " + uriInfo.getAbsolutePath() + " does not exist."),
404);
}
return entity;
}
}
public static class TripResourceSub extends TripResource {
private TripSegment parent;
public void setParent(TripSegment parent) {
this.parent = parent;
}
@Override
public Trip getEntity() {
Trip entity = parent.getTrip();
if (entity == null) {
throw new WebApplicationException(new Throwable("Resource for " + uriInfo.getAbsolutePath() + " does not exist."),
404);
}
return entity;
}
}
}