JSONRootElementProvider.java

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

import com.sun.jersey.api.json.JSONConfiguration;
import com.sun.jersey.api.json.JSONJAXBContext;
import com.sun.jersey.api.json.JSONMarshaller;
import com.sun.jersey.core.header.MediaTypes;
import com.sun.jersey.core.provider.jaxb.AbstractRootElementProvider;
import com.sun.jersey.core.util.FeaturesAndProperties;
import com.sun.jersey.json.impl.reader.JsonFormatException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.nio.charset.Charset;
import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response.Status;
import javax.ws.rs.ext.Providers;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

/**
 *
 * @author Paul.Sandoz@Sun.Com, Jakub.Podlesak@Sun.COM
 */
public class JSONRootElementProvider extends AbstractRootElementProvider {

    boolean jacksonEntityProviderTakesPrecedence = false;

    JSONRootElementProvider(Providers ps) {
        super(ps);
    }

    JSONRootElementProvider(Providers ps, MediaType mt) {
        super(ps, mt);
    }

    @Context @Override
    public void setConfiguration(FeaturesAndProperties fp) {
        super.setConfiguration(fp);
        consumeFeaturesAndProperties(fp);
    }

    protected void consumeFeaturesAndProperties(FeaturesAndProperties fp) {
        jacksonEntityProviderTakesPrecedence = fp.getFeature(JSONConfiguration.FEATURE_POJO_MAPPING);
    }
    
    @Override
    public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return !jacksonEntityProviderTakesPrecedence && super.isReadable(type, genericType, annotations, mediaType);
    }

    @Override
    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return !jacksonEntityProviderTakesPrecedence && super.isWriteable(type, genericType, annotations, mediaType);
    }


    @Produces("application/json")
    @Consumes("application/json")
    public static final class App extends JSONRootElementProvider {

        public App(@Context Providers ps) {
            super(ps, MediaType.APPLICATION_JSON_TYPE);
        }
    }

    @Produces("*/*")
    @Consumes("*/*")
    public static final class General extends JSONRootElementProvider {

        public General(@Context Providers ps) {
            super(ps);
        }

        @Override
        protected boolean isSupported(MediaType m) {
            return !jacksonEntityProviderTakesPrecedence && m.getSubtype().endsWith("+json");
        }
    }

    // Added to ensure that as part per bug JERSEY-1593 we don't
    // alter the output of the WADL if we turn on POJO mapping, the format
    // with be the default MAPPED version unless the users put in a specific
    // JAXBContext to override.
    //
    @Produces(MediaTypes.WADL_JSON_STRING)
    @Consumes(MediaTypes.WADL_JSON_STRING)
    public static final class Wadl extends JSONRootElementProvider {

        public Wadl(@Context Providers ps) {
            super(ps, MediaTypes.WADL_JSON);
        }

        protected void consumeFeaturesAndProperties(FeaturesAndProperties fp) {
            // GNDN, prevent the jackson entity provider from taking precenence
        }
    }
    
    
    @Override
    protected final Object readFrom(Class<Object> type, MediaType mediaType,
            Unmarshaller u, InputStream entityStream)
            throws JAXBException {
        final Charset c = getCharset(mediaType);

        try {
            return JSONJAXBContext.getJSONUnmarshaller(u, getJAXBContext(type)).
                    unmarshalFromJSON(new InputStreamReader(entityStream, c), type);
        } catch (JsonFormatException e) {
            throw new WebApplicationException(e, Status.BAD_REQUEST);
        }
    }

    @Override
    protected void writeTo(Object t, MediaType mediaType, Charset c,
            Marshaller m, OutputStream entityStream)
            throws JAXBException {
        JSONMarshaller jsonMarshaller = JSONJAXBContext.getJSONMarshaller(m, getJAXBContext(t.getClass()));
        if(isFormattedOutput())
            jsonMarshaller.setProperty(JSONMarshaller.FORMATTED, true);
        jsonMarshaller.marshallToJSON(t, new OutputStreamWriter(entityStream, c));
    }
}