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package com.sun.jersey.fastinfoset.impl.provider.entity;

import com.sun.jersey.core.header.MediaTypes;
import com.sun.jersey.core.provider.jaxb.AbstractListElementProvider;
import com.sun.jersey.core.util.ThrowHelper;
import com.sun.xml.fastinfoset.stax.StAXDocumentParser;
import com.sun.xml.fastinfoset.stax.StAXDocumentSerializer;

import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.ext.Providers;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.util.Collection;

/**
 *
 * @author Paul.Sandoz@Sun.Com
 */
@Produces("application/fastinfoset")
@Consumes("application/fastinfoset")
public class FastInfosetListElementProvider extends AbstractListElementProvider {

    public FastInfosetListElementProvider(@Context Providers ps) {
        super(ps, MediaTypes.FAST_INFOSET);
    }

    @Override
    protected final XMLStreamReader getXMLStreamReader(Class<?> elementType, MediaType mediaType, Unmarshaller u,
            InputStream entityStream)
            throws XMLStreamException {
        StAXDocumentParser parser = new StAXDocumentParser(entityStream);

        // jaxb needs interning doc parser, see http://java.net/jira/browse/JERSEY-320
        parser.setStringInterning(true);

        return parser;
    }

    public final void writeList(Class<?> elementType, Collection<?> t,
            MediaType mediaType, Charset c,
            Marshaller m, OutputStream entityStream)
            throws JAXBException, IOException {
        final XMLStreamWriter xsw = new StAXDocumentSerializer(entityStream);
        
        final String rootElement = getRootElementName(elementType);
        
        try {
            xsw.writeStartDocument();
            xsw.writeStartElement(rootElement);
            for (Object o : t)
                m.marshal(o, xsw);
            xsw.writeEndElement();
            xsw.writeEndDocument();
            xsw.flush();
        } catch (XMLStreamException cause) {
            throw ThrowHelper.withInitCause(cause,
                    new IOException()
                    );            
        }
    }
}