/
ParseMessagesToStream.java
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/
ParseMessagesToStream.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
package org.jclouds.openstack.marconi.v1.functions;
import com.google.common.base.Function;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Multimap;
import org.jclouds.http.HttpResponse;
import org.jclouds.http.functions.ParseJson;
import org.jclouds.openstack.marconi.v1.domain.Message;
import org.jclouds.openstack.marconi.v1.domain.MessageStream;
import org.jclouds.openstack.v2_0.domain.Link;
import org.jclouds.openstack.v2_0.domain.PaginatedCollection;
import javax.inject.Inject;
import java.beans.ConstructorProperties;
import java.net.URI;
import java.net.URISyntaxException;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.collect.Iterables.getOnlyElement;
import static com.google.common.collect.Iterables.transform;
import static org.jclouds.http.utils.Queries.queryParser;
/**
* @author Everett Toews
*/
public class ParseMessagesToStream implements Function<HttpResponse, MessageStream> {
private final ParseJson<MessagesWithHref> json;
@Inject
ParseMessagesToStream(ParseJson<MessagesWithHref> json) {
this.json = checkNotNull(json, "json");
}
@Override
public MessageStream apply(HttpResponse response) {
// An empty message stream has a 204 response code
if (response.getStatusCode() == 204) {
return new Messages(ImmutableSet.<Message> of(), ImmutableSet.<Link> of());
}
MessagesWithHref messagesWithHref = json.apply(response);
Iterable<Message> messages = transform(messagesWithHref, TO_MESSAGE);
return new Messages(messages, messagesWithHref.getLinks());
}
/**
* Strip off everything but the message id.
*/
private static String getIdFromHref(String rawMessageHref) {
int indexOfQuestionMark = rawMessageHref.indexOf('?');
int lastIndexOfSlash = rawMessageHref.lastIndexOf('/') + 1;
if (indexOfQuestionMark > lastIndexOfSlash) {
return rawMessageHref.substring(lastIndexOfSlash, indexOfQuestionMark);
}
else {
return rawMessageHref.substring(lastIndexOfSlash);
}
}
private static String getClaimIdFromHref(String rawMessageHref) {
try {
String query = new URI(rawMessageHref).getQuery();
if (query != null) {
Multimap<String, String> queryParams = queryParser().apply(query);
return getOnlyElement(queryParams.get("claim_id"), null);
}
else {
return null;
}
}
catch (URISyntaxException e) {
return null;
}
}
protected static final Function<MessageWithHref, Message> TO_MESSAGE = new Function<MessageWithHref, Message>() {
@Override
public Message apply(MessageWithHref messageWithHref) {
return messageWithHref.toBuilder()
.id(getIdFromHref(messageWithHref.getId()))
.claimId(getClaimIdFromHref(messageWithHref.getId()))
.build();
}
};
protected static final Function<String, String> TO_ID_FROM_HREF = new Function<String, String>() {
@Override
public String apply(String messageIdWithHref) {
return getIdFromHref(messageIdWithHref);
}
};
private static class Messages extends MessageStream {
@ConstructorProperties({ "messages", "links" })
protected Messages(Iterable<Message> messages, Iterable<Link> links) {
super(messages, links);
}
}
private static class MessagesWithHref extends PaginatedCollection<MessageWithHref> {
@ConstructorProperties({ "messages", "links" })
protected MessagesWithHref(Iterable<MessageWithHref> messagesWithHref, Iterable<Link> links) {
super(messagesWithHref, links);
}
}
protected static class MessageWithHref extends Message {
@ConstructorProperties({ "href", "ttl", "body", "age" })
protected MessageWithHref(String href, int ttl, String body, int age) {
super(href, ttl, body, age, null);
}
}
}