JSONListElementProvider.java

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

import com.sun.jersey.api.json.JSONConfigurated;
import com.sun.jersey.api.json.JSONConfiguration;
import com.sun.jersey.core.provider.jaxb.AbstractListElementProvider;
import com.sun.jersey.core.util.FeaturesAndProperties;
import com.sun.jersey.json.impl.JSONHelper;
import com.sun.jersey.json.impl.Stax2JsonFactory;
import java.io.IOException;
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 java.util.Collection;
import java.util.logging.Level;
import java.util.logging.Logger;
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;

/**
 *
 * @author Jakub.Podlesak@Sun.COM
 */
public class JSONListElementProvider extends AbstractListElementProvider {

    boolean jacksonEntityProviderTakesPrecedence = false;

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

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

    @Context @Override
    public void setConfiguration(FeaturesAndProperties fp) {
        super.setConfiguration(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 JSONListElementProvider {
        public App(@Context Providers ps) { super(ps , MediaType.APPLICATION_JSON_TYPE); }
    }

    @Produces("*/*")
    @Consumes("*/*")
    public static final class General extends JSONListElementProvider {
        public General(@Context Providers ps) { super(ps); }

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

    @Override
    public final void writeList(Class<?> elementType, Collection<?> t, MediaType mediaType, Charset c, Marshaller m, OutputStream entityStream) throws JAXBException, IOException {
        final OutputStreamWriter osw = new OutputStreamWriter(entityStream, c);

        JSONConfiguration origJsonConfig = JSONConfiguration.DEFAULT;
        if (m instanceof JSONConfigurated) {
            origJsonConfig = ((JSONConfigurated)m).getJSONConfiguration();
        }

        final JSONConfiguration unwrappingJsonConfig =
                JSONConfiguration.createJSONConfigurationWithRootUnwrapping(origJsonConfig, true);

        final XMLStreamWriter jxsw = Stax2JsonFactory.createWriter(osw, unwrappingJsonConfig, true);
        final String invisibleRootName = getRootElementName(elementType);
        final String elementName = getElementName(elementType);

        try {
            if (!origJsonConfig.isRootUnwrapping()) {
              osw.append(String.format("{\"%s\":", elementName));
              osw.flush();
            }
            jxsw.writeStartDocument();
            jxsw.writeStartElement(invisibleRootName);
            for (Object o : t) {
                    m.marshal(o, jxsw);
            }
            jxsw.writeEndElement();
            jxsw.writeEndDocument();
            jxsw.flush();
            if (!origJsonConfig.isRootUnwrapping()) {
              osw.append("}");
              osw.flush();
            }
        } catch (XMLStreamException ex) {
            Logger.getLogger(JSONListElementProvider.class.getName()).log(Level.SEVERE, null, ex);
            throw new JAXBException(ex.getMessage(), ex);
        }
    }

    @Override
    protected final XMLStreamReader getXMLStreamReader(Class<?> elementType, MediaType mediaType, Unmarshaller u, InputStream entityStream) throws XMLStreamException {
        JSONConfiguration c = JSONConfiguration.DEFAULT;
        final Charset charset = getCharset(mediaType);
        if (u instanceof JSONConfigurated) {
            c = ((JSONConfigurated) u).getJSONConfiguration();
        }
        return Stax2JsonFactory.createReader(new InputStreamReader(entityStream, charset), c, JSONHelper.getRootElementName((Class)elementType), true);
    }
}