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Explore the source code of the class JsonListElementProvider.java

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 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
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package org.glassfish.jersey.media.json.internal.entity;

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;

import org.glassfish.jersey.media.json.JsonConfigured;
import org.glassfish.jersey.media.json.JsonConfiguration;
import org.glassfish.jersey.media.json.internal.JsonHelper;
import org.glassfish.jersey.media.json.internal.Stax2JsonFactory;
import org.glassfish.jersey.message.internal.AbstractCollectionJaxbProvider;

/**
 * JSON message entity media type provider (reader & writer) for collection
 * types.
 *
 * @author Jakub Podlesak
 */
public class JsonListElementProvider extends AbstractCollectionJaxbProvider {

    boolean jacksonEntityProviderTakesPrecedence = false;

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

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

// TODO add support for configuration from injected features&properties
//    @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 JsonConfigured) {
            origJsonConfig = ((JsonConfigured) 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 JsonConfigured) {
            c = ((JsonConfigured) u).getJSONConfiguration();
        }
        return Stax2JsonFactory.createReader(new InputStreamReader(entityStream, charset), c, JsonHelper.getRootElementName((Class) elementType), true);
    }
}