Package com.sun.jersey.atom.rome.impl.provider.entity

Source Code of com.sun.jersey.atom.rome.impl.provider.entity.AtomFeedProvider

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package com.sun.jersey.atom.rome.impl.provider.entity;

import com.sun.jersey.core.provider.AbstractMessageReaderWriterProvider;
import com.sun.syndication.feed.WireFeed;
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 com.sun.jersey.atom.rome.impl.ImplMessages;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import org.jdom.Document;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;

/**
*
* @author Paul.Sandoz@Sun.Com
*/
public final class AtomFeedProvider extends AbstractMessageReaderWriterProvider<Feed> {
    private static final String FEED_TYPE = "atom_1.0";
   
    public AtomFeedProvider() {
        Class<?> c = Feed.class;       
    }
   
    public boolean isReadable(Class<?> type, Type genericType, Annotation annotations[], MediaType mediaType) {
        return type == Feed.class;
    }

    public Feed readFrom(
            Class<Feed> type,
            Type genericType,
            Annotation annotations[],
            MediaType mediaType,
            MultivaluedMap<String, String> httpHeaders,
            InputStream entityStream) throws IOException {
        try {
            WireFeedInput input = new WireFeedInput();                     
            WireFeed wireFeed = input.build(new InputStreamReader(entityStream));   
            if (!(wireFeed instanceof Feed)) {
                throw new IOException(ImplMessages.ERROR_NOT_ATOM_FEED(type));
            }
            return (Feed)wireFeed;
        } catch (FeedException cause) {
            IOException effect = new IOException(ImplMessages.ERROR_MARSHALLING_ATOM(type));
            effect.initCause(cause);
            throw effect;
        }
    }

    public boolean isWriteable(Class<?> type, Type genericType, Annotation annotations[], MediaType mediaType) {
        return type == Feed.class;
    }
   
    public void writeTo(
            Feed t,
            Class<?> type,
            Type genericType,
            Annotation annotations[],
            MediaType mediaType,
            MultivaluedMap<String, Object> httpHeaders,
            OutputStream entityStream) throws IOException {
        try {
            t.setFeedType(FEED_TYPE);
            WireFeedOutput wireFeedOutput = new WireFeedOutput();
            Document feedDoc = wireFeedOutput.outputJDom(t);

            XMLOutputter outputter = new XMLOutputter();
            outputter.setFormat(Format.getPrettyFormat());
            outputter.output(feedDoc, entityStream);         
        } catch ( FeedException cause) {
            IOException effect = new IOException(ImplMessages.ERROR_MARSHALLING_ATOM(t.getClass()));
            effect.initCause(cause);
            throw effect;
        }
    }   
}
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