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package org.glassfish.jersey.tests.e2e.entity.filtering;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ws.rs.Consumes;
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.MessageBodyReader;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import javax.inject.Inject;
import org.glassfish.jersey.message.filtering.spi.FilteringHelper;
import org.glassfish.jersey.message.filtering.spi.ObjectGraph;
import org.glassfish.jersey.message.filtering.spi.ObjectProvider;
/**
* @author Michal Gajdos
*/
@Provider
@Consumes("entity/filtering")
@Produces("entity/filtering")
public class FilteringMessageBodyProvider implements MessageBodyReader<Object>, MessageBodyWriter<Object> {
private static final Logger LOGGER = Logger.getLogger(FilteringMessageBodyProvider.class.getName());
@Inject
private javax.inject.Provider<ObjectProvider<ObjectGraph>> provider;
@Override
public boolean isReadable(final Class<?> type, final Type genericType, final Annotation[] annotations,
final MediaType mediaType) {
return String.class != type;
}
@Override
public boolean isWriteable(final Class<?> type, final Type genericType, final Annotation[] annotations,
final MediaType mediaType) {
return String.class != type;
}
@Override
public long getSize(final Object o, final Class<?> type, final Type genericType, final Annotation[] annotations,
final MediaType mediaType) {
return -1;
}
@Override
public Object readFrom(final Class<Object> type, final Type genericType, final Annotation[] annotations,
final MediaType mediaType, final MultivaluedMap<String, String> httpHeaders,
final InputStream entityStream) throws IOException, WebApplicationException {
try {
final ObjectGraph objectGraph = provider.get()
.getFilteringObject(FilteringHelper.getEntityClass(genericType), false, annotations);
return objectGraphToString(objectGraph);
} catch (final Throwable t) {
LOGGER.log(Level.WARNING, "Error during reading an object graph.", t);
return "ERROR: " + t.getMessage();
}
}
@Override
public void writeTo(final Object o, final Class<?> type, final Type genericType, final Annotation[] annotations,
final MediaType mediaType, final MultivaluedMap<String, Object> httpHeaders,
final OutputStream entityStream) throws IOException, WebApplicationException {
final ObjectGraph objectGraph = provider.get()
.getFilteringObject(FilteringHelper.getEntityClass(genericType), true, annotations);
try {
entityStream.write(objectGraphToString(objectGraph).getBytes());
} catch (final Throwable t) {
LOGGER.log(Level.WARNING, "Error during writing an object graph.", t);
}
}
private static String objectGraphToString(final ObjectGraph objectGraph) {
final StringBuilder sb = new StringBuilder();
for (final String field : objectGraphToFields("", objectGraph)) {
if (!field.contains("Transient")) {
sb.append(field).append(',');
}
}
if (sb.length() > 0) {
sb.delete(sb.length() - 1, sb.length());
}
return sb.toString();
}
private static List<String> objectGraphToFields(final String prefix, final ObjectGraph objectGraph) {
final List<String> fields = new ArrayList<>();
// Fields.
for (final String field : objectGraph.getFields()) {
fields.add(prefix + field);
}
for (final Map.Entry<String, ObjectGraph> entry : objectGraph.getSubgraphs().entrySet()) {
fields.addAll(objectGraphToFields(prefix + entry.getKey() + ".", entry.getValue()));
}
return fields;
}
}