/*
* JBoss, Home of Professional Open Source.
* Copyright 2011, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.gatein.management.rest.providers;
import org.gatein.management.rest.content.Child;
import org.gatein.management.rest.content.Link;
import org.gatein.management.rest.content.Operation;
import org.gatein.management.rest.content.Resource;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONWriter;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.Writer;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* JSON Provider to control marshalling of a managed resource.
*
* @author <a href="mailto:nscavell@redhat.com">Nick Scavelli</a>
* @version $Revision$
*/
@Provider
@Produces(MediaType.APPLICATION_JSON)
public class JsonResourceProvider implements MessageBodyWriter<Resource>
{
@Override
public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType)
{
return (Resource.class.isAssignableFrom(type));
}
@Override
public long getSize(Resource resource, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType)
{
return -1;
}
@Override
public void writeTo(Resource resource, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException
{
PrintWriter printWriter = new PrintWriter(entityStream);
try
{
JSONWriter writer = new JSONWriter(printWriter);
writer.object().key("description").value(resource.getDescription());
writer.key("children").array();
for (Child child : resource.getChildren())
{
writeChild(child, writer);
}
writer.endArray();
if (resource.getOperations() != null)
{
writer.key("operations").array();
for (Operation operation : resource.getOperations())
{
writeOperation(operation, writer);
}
writer.endArray();
}
writer.endObject();
printWriter.flush();
}
catch (JSONException e)
{
throw new IOException("Exception writing json result.", e);
}
finally
{
printWriter.close();
}
}
private void writeOperation(Operation operation, JSONWriter writer) throws IOException, JSONException
{
writer.object().key("operation-name").value(operation.getOperationName());
writer.key("operation-description").value(operation.getOperationDescription());
writeLink("link", operation.getOperationLink(), writer);
writer.endObject();
}
private void writeChild(Child child, JSONWriter writer) throws IOException, JSONException
{
writer.object().key("name").value(child.getName());
writer.key("description").value(child.getDescription());
writeLink("link", child.getLink(), writer);
writer.endObject();
}
private void writeLink(String name, Link link, JSONWriter writer) throws IOException, JSONException
{
writer.key(name).object();
if (link.getRel() != null)
{
writer.key("rel").value(link.getRel());
}
writer.key("href").value(link.getHref());
if (link.getType() != null)
{
writer.key("type").value(link.getType());
}
if (link.getMethod() != null)
{
writer.key("method").value(link.getMethod());
}
writer.endObject();
}
}