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Apache CXF example source code file (BadgerFishProvider.java)

This example Apache CXF source code file (BadgerFishProvider.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Apache CXF tags/keywords

annotation, annotation, badgerfishxmlinputfactory, class, io, jaxbcontext, jaxbcontext, jaxbexception, mediatype, mediatype, multivaluedmap, object, reflection, type, type, util, xmlstreamexception

The Apache CXF BadgerFishProvider.java source code

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.cxf.systest.jaxrs;


import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.Locale;
import java.util.Map;
import java.util.WeakHashMap;

import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;

import org.codehaus.jettison.badgerfish.BadgerFishXMLInputFactory;
import org.codehaus.jettison.badgerfish.BadgerFishXMLOutputFactory;

@Produces("application/json")
@Consumes("application/json")
@Provider
public final class BadgerFishProvider 
    implements MessageBodyReader<Object>, MessageBodyWriter  {

    
    private static Map<Class, JAXBContext> jaxbContexts = new WeakHashMap();
    @Context
    private HttpHeaders requestHeaders;  
    
    public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType m) {
        return type.getAnnotation(XmlRootElement.class) != null;
    }
    
    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType m) {
        return type.getAnnotation(XmlRootElement.class) != null;
    }

    public long getSize(Object o, Class<?> type, Type genericType, Annotation[] annotations, MediaType m) {
        return -1;
    }
    
    public Object readFrom(Class<Object> type, Type genericType, Annotation[] annotations, 
                           MediaType m, MultivaluedMap<String, String> headers, InputStream is) {
        try {
            JAXBContext context = getJAXBContext(type);
            Unmarshaller unmarshaller = context.createUnmarshaller();
               
            BadgerFishXMLInputFactory factory = new BadgerFishXMLInputFactory();
            XMLStreamReader xsw = factory.createXMLStreamReader(is);            
            Object obj = unmarshaller.unmarshal(xsw);
            xsw.close();
            return obj;
        } catch (JAXBException e) {
            e.printStackTrace();         
        } catch (XMLStreamException e) {
            e.printStackTrace();
        }

        return null;
    }

    public void writeTo(Object obj, Class<?> clazz, Type genericType, Annotation[] annotations,  
        MediaType m, MultivaluedMap<String, Object> headers, OutputStream os) {
        try {
            if (!new Locale("badgerFishLanguage").equals(requestHeaders.getLanguage())) {
                throw new RuntimeException();
            }
            
            JAXBContext context = getJAXBContext(obj.getClass());
            Marshaller marshaller = context.createMarshaller();
                        
            XMLOutputFactory factory = new BadgerFishXMLOutputFactory();
            XMLStreamWriter xsw = factory.createXMLStreamWriter(os);            
            marshaller.marshal(obj, xsw);
            xsw.close();
            
        } catch (JAXBException e) {
            e.printStackTrace();
        } catch (XMLStreamException e) {
            e.printStackTrace();
        }
    }

    private JAXBContext getJAXBContext(Class type) throws JAXBException {
        synchronized (jaxbContexts) {
            JAXBContext context = jaxbContexts.get(type);
            if (context == null) {
                context = JAXBContext.newInstance(type);
                jaxbContexts.put(type, context);
            }
            return context;
        }
    }
}




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