/*
* 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
*
* 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.apache.streams.moreover;
import org.apache.streams.data.ActivitySerializer;
import org.apache.streams.pojo.json.Activity;
import com.moreover.api.Article;
import com.moreover.api.ArticlesResponse;
import com.moreover.api.ObjectFactory;
import org.apache.commons.lang.SerializationException;
import java.io.StringReader;
import java.util.LinkedList;
import java.util.List;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
/**
* Deserializes the Moreover Article XML and converts it to an instance of {@link Activity}.
*/
public class MoreoverXmlActivitySerializer implements ActivitySerializer<String> {
//JAXBContext is threadsafe (supposedly)
private final JAXBContext articleContext;
private final JAXBContext articlesContext;
public MoreoverXmlActivitySerializer() {
articleContext = createContext(Article.class);
articlesContext = createContext(ArticlesResponse.class);
}
@Override
public String serializationFormat() {
return "application/xml+vnd.moreover.com.v1";
}
@Override
public String serialize(Activity deserialized) {
throw new UnsupportedOperationException("Cannot currently serialize to Moreover");
}
@Override
public Activity deserialize(String serialized) {
Article article = deserializeMoreover(serialized);
return MoreoverUtils.convert(article);
}
@Override
public List<Activity> deserializeAll(List<String> serializedList) {
List<Activity> activities = new LinkedList<Activity>();
for (String item : serializedList) {
ArticlesResponse response = deserializeMoreoverResponse(item);
for (Article article : response.getArticles().getArticle()) {
activities.add(MoreoverUtils.convert(article));
}
}
return activities;
}
private Article deserializeMoreover(String serialized) {
try {
Unmarshaller unmarshaller = articleContext.createUnmarshaller();
return (Article) unmarshaller.unmarshal(new StringReader(serialized));
} catch (JAXBException ex) {
throw new SerializationException("Unable to deserialize Moreover data", ex);
}
}
private ArticlesResponse deserializeMoreoverResponse(String serialized) {
try {
Unmarshaller unmarshaller = articlesContext.createUnmarshaller();
return ((JAXBElement<ArticlesResponse>) unmarshaller.unmarshal(new StringReader(serialized))).getValue();
} catch (JAXBException ex) {
throw new SerializationException("Unable to deserialize Moreover data", ex);
}
}
private JAXBContext createContext(Class articleClass) {
JAXBContext context;
try {
context = JAXBContext.newInstance(articleClass.getPackage().getName(), ObjectFactory.class.getClassLoader());
} catch (JAXBException ex) {
throw new IllegalStateException("Unable to create JAXB Context for Moreover data", ex);
}
return context;
}
}