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package org.glassfish.jersey.examples.jersey_ejb.entities;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.net.URI;
import java.util.List;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.UriInfo;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import javax.ejb.Stateless;
import org.glassfish.jersey.message.MessageUtils;
/**
* A simple HTML message body writer to serialize list of message beans.
*
* @author Pavel Bucek (pavel.bucek at oracle.com)
*/
@Stateless
@Provider
public class MessageListWriter implements MessageBodyWriter<List<Message>> {
@Context
private javax.inject.Provider<UriInfo> ui;
@Override
public boolean isWriteable(final Class<?> clazz, final Type type, final Annotation[] annotation, final MediaType mediaType) {
return verifyGenericType(type);
}
private boolean verifyGenericType(final Type genericType) {
if (!(genericType instanceof ParameterizedType)) {
return false;
}
final ParameterizedType pt = (ParameterizedType) genericType;
if (pt.getActualTypeArguments().length > 1) {
return false;
}
if (!(pt.getActualTypeArguments()[0] instanceof Class)) {
return false;
}
final Class listClass = (Class) pt.getActualTypeArguments()[0];
return listClass == Message.class;
}
@Override
public long getSize(final List<Message> messages,
final Class<?> clazz,
final Type type,
final Annotation[] annotation,
final MediaType mediaType) {
return -1;
}
@Override
public void writeTo(final List<Message> messages,
final Class<?> clazz,
final Type type,
final Annotation[] annotation,
final MediaType mediaType,
final MultivaluedMap<String, Object> arg5,
final OutputStream ostream) throws IOException, WebApplicationException {
for (final Message m : messages) {
ostream.write(m.toString().getBytes(MessageUtils.getCharset(mediaType)));
final URI mUri = ui.get().getAbsolutePathBuilder().path(Integer.toString(m.getUniqueId())).build();
ostream.write((" <a href='" + mUri.toASCIIString() + "'>link</a><br />").getBytes());
}
}
}