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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;
        }
    }    
}
