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package com.sun.jersey.atom.rome.impl.provider.entity;
import com.sun.jersey.atom.rome.impl.ImplMessages;
import com.sun.jersey.core.provider.AbstractMessageReaderWriterProvider;
import com.sun.syndication.feed.atom.Entry;
import com.sun.syndication.feed.atom.Feed;
import com.sun.syndication.io.FeedException;
import com.sun.syndication.io.WireFeedInput;
import com.sun.syndication.io.WireFeedOutput;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;
/**
*
* @author [email protected]
*/
public final class AtomEntryProvider extends AbstractMessageReaderWriterProvider {
private static final String FEED_TYPE = "atom_1.0";
public AtomEntryProvider() {
Class c = Entry.class;
}
public boolean isReadable(Class type, Type genericType, Annotation annotations[], MediaType mediaType) {
return type == Entry.class;
}
public Entry readFrom(
Class type,
Type genericType,
Annotation annotations[],
MediaType mediaType,
MultivaluedMap httpHeaders,
InputStream entityStream) throws IOException {
try {
return parseEntry(entityStream);
} catch (FeedException cause) {
IOException effect = new IOException(ImplMessages.ERROR_CREATING_ATOM(type));
effect.initCause(cause);
throw effect;
} catch (JDOMException cause2) {
IOException effect = new IOException(ImplMessages.ERROR_CREATING_ATOM(type));
effect.initCause(cause2);
throw effect;
}
}
public boolean isWriteable(Class type, Type genericType, Annotation annotations[], MediaType mediaType) {
return type == Entry.class;
}
public void writeTo(
Entry t,
Class type,
Type genericType,
Annotation annotations[],
MediaType mediaType,
MultivaluedMap httpHeaders,
OutputStream entityStream) throws IOException {
try {
serializeEntry(t, entityStream);
} catch (FeedException cause) {
IOException effect = new IOException(ImplMessages.ERROR_MARSHALLING_ATOM(t.getClass()));
effect.initCause(cause);
throw effect;
}
}
/**
* Parse entry from InputStream.
*/
private static Entry parseEntry(InputStream in)
throws JDOMException, IOException, IllegalArgumentException, FeedException {
// Parse entry into JDOM tree
SAXBuilder builder = new SAXBuilder();
Document entryDoc = builder.build(in);
Element fetchedEntryElement = entryDoc.getRootElement();
fetchedEntryElement.detach();
// Put entry into a JDOM document with 'feed' root so that Rome can handle it
Feed feed = new Feed();
feed.setFeedType(FEED_TYPE);
WireFeedOutput wireFeedOutput = new WireFeedOutput();
Document feedDoc = wireFeedOutput.outputJDom(feed);
feedDoc.getRootElement().addContent(fetchedEntryElement);
WireFeedInput input = new WireFeedInput();
Feed parsedFeed = (Feed)input.build(feedDoc);
return (Entry)parsedFeed.getEntries().get(0);
}
/**
* Serialize an entry to an OutputStream.
*
* @param entry the entry to serialize
* @param out the output stream to which the entry will be written
* @throws java.lang.IllegalArgumentException if the entry is malformed
* @throws com.sun.syndication.io.FeedException if an error is raised by the ROME library
* @throws java.io.IOException if an IO error occurs
*/
@SuppressWarnings("unchecked")
private static void serializeEntry(Entry entry, OutputStream out)
throws IllegalArgumentException, FeedException, IOException {
// Build a feed containing only the entry
List entries = new ArrayList();
entries.add(entry);
Feed feed1 = new Feed();
feed1.setFeedType( FEED_TYPE);
feed1.setEntries(entries);
// Use Rome to output feed as a JDOM document
WireFeedOutput wireFeedOutput = new WireFeedOutput();
Document feedDoc = wireFeedOutput.outputJDom(feed1);
// Grab entry element from feed and get JDOM to serialize it
Element entryElement= (Element)feedDoc.getRootElement().getChildren().get(0);
XMLOutputter outputter = new XMLOutputter();
outputter.setFormat(Format.getPrettyFormat());
outputter.output(entryElement, out);
}
}
