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 *
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 * may not use this file except in compliance with the License.  You can
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 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
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package org.glassfish.admin.rest.provider;

import fish.payara.admin.rest.streams.StreamWriter;
import fish.payara.admin.rest.streams.JsonStreamWriter;
import fish.payara.admin.rest.streams.XmlStreamWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.logging.Level;
import jakarta.ws.rs.WebApplicationException;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.MultivaluedMap;
import jakarta.ws.rs.core.Response;
import javax.xml.stream.XMLStreamException;
import org.glassfish.admin.rest.RestLogging;

/** Abstract implementation for entity writers to STaX API. This supports 
 * XML and JSON.
 *
 * @since 4.0
 * @author mmares
 */
public abstract class AbstractStaxProvider extends BaseProvider {
    
    public AbstractStaxProvider(Class desiredType, MediaType ... mediaType) {
        super(desiredType, mediaType);
    }
    
    @Override
    protected boolean isGivenTypeWritable(Class type, Type genericType) {
        return desiredType.isAssignableFrom(type);
    }
    
    /** Marshalling implementation here.
     * 
     * @param proxy object to marshal
     * @param wr STaX for marshaling
     * @throws XMLStreamException 
     * @throws java.io.IOException 
     */ 
    protected abstract void writeContentToStream(T proxy, final StreamWriter wr) throws Exception;

    @Override
    public String getContent(T proxy) {
        throw new UnsupportedOperationException("Provides only streaming implementation");
    }
    
    /** Faster with direct stream writing
     */
    @Override
    public void writeTo(T proxy, Class type, Type genericType, Annotation[] annotations, MediaType mediaType,
            MultivaluedMap httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException {
        StreamWriter writer = null;
        try {
            if ("xml".equals(mediaType.getSubtype())) {
                writer = new XmlStreamWriter(entityStream);
            } else {
                writer = new JsonStreamWriter(entityStream);
            }
            writeContentToStream(proxy, writer);
            writer.close();
        } catch (Exception ex) {
            RestLogging.restLogger.log(Level.SEVERE, RestLogging.CANNOT_MARSHAL, ex);
            throw new WebApplicationException(ex, Response.Status.INTERNAL_SERVER_ERROR);
        }
    }

}