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/*
* Copyright 2013 Jesse Morgan
*/
package com.p4square.grow.backend.feed;
import java.io.IOException;
import java.util.Date;
import java.util.Map;
import org.restlet.data.Status;
import org.restlet.resource.ServerResource;
import org.restlet.representation.Representation;
import org.restlet.ext.jackson.JacksonRepresentation;
import org.apache.log4j.Logger;
import com.p4square.grow.model.Message;
/**
* ThreadResource manages the messages that make up a thread.
*
* @author Jesse Morgan <jesse@jesterpm.net>
*/
public class ThreadResource extends ServerResource {
private static final Logger LOG = Logger.getLogger(ThreadResource.class);
private FeedDataProvider mBackend;
private String mTopic;
private String mThreadId;
@Override
public void doInit() {
super.doInit();
mBackend = (FeedDataProvider) getApplication();
mTopic = getAttribute("topic");
mThreadId = getAttribute("thread");
}
/**
* GET a list of messages in a thread.
*/
@Override
protected Representation get() {
// If the topic or threadId are missing, return a 404.
if (mTopic == null || mTopic.length() == 0 ||
mThreadId == null || mThreadId.length() == 0) {
setStatus(Status.CLIENT_ERROR_NOT_FOUND);
return null;
}
// TODO: Support limit query parameter.
try {
String collectionKey = mTopic + "/" + mThreadId;
Map<String, Message> messages = mBackend.getMessageProvider().query(collectionKey);
return new JacksonRepresentation(messages.values());
} catch (IOException e) {
LOG.error("Unexpected exception: " + e.getMessage(), e);
setStatus(Status.SERVER_ERROR_INTERNAL);
return null;
}
}
/**
* POST a new message to the thread.
*/
@Override
protected Representation post(Representation entity) {
// If the topic and thread are not provided, respond with not allowed.
// TODO: Check if the thread exists.
if (mTopic == null || !mBackend.TOPICS.contains(mTopic) ||
mThreadId == null || mThreadId.length() == 0) {
setStatus(Status.CLIENT_ERROR_METHOD_NOT_ALLOWED);
return null;
}
try {
JacksonRepresentation<Message> jsonRep = new JacksonRepresentation<Message>(entity, Message.class);
Message message = jsonRep.getObject();
// Force the thread id and message to be what we expect.
message.setThreadId(mThreadId);
message.setId(Message.generateId());
if (message.getCreated() == null) {
message.setCreated(new Date());
}
String collectionKey = mTopic + "/" + mThreadId;
mBackend.getMessageProvider().put(collectionKey, message.getId(), message);
setLocationRef(mThreadId + "/" + message.getId());
return new JacksonRepresentation(message);
} catch (IOException e) {
LOG.error("Unexpected exception: " + e.getMessage(), e);
setStatus(Status.SERVER_ERROR_INTERNAL);
return null;
}
}
}
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