package com.example.util;
import java.io.IOException;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang3.Validate;
import org.apache.commons.logging.LogFactory;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.ser.FilterProvider;
import com.fasterxml.jackson.databind.ser.impl.SimpleBeanPropertyFilter;
import com.fasterxml.jackson.databind.ser.impl.SimpleFilterProvider;
import com.example.util.LogUtil;
import net.sourceforge.stripes.action.StreamingResolution;
/**
* The default response to a web service which {@link JsonReply replys} with {@link StreamingResolution streaming} JSON using a Jackson {@link ObjectMapper}.
*/
public class JsonResolution extends AbstractJsonResolution {
private static final LogUtil LOG = LogUtil.getInstance(LogFactory.getLog(JsonResolution.class));
private final JsonReply reply;
public JsonResolution(JsonReply reply) {
super();
Validate.notNull(reply);
this.reply = reply;
}
@Override
public void stream(HttpServletResponse response) {
Validate.notNull(response);
LOG.trace("Replying with: ", reply.getClass().getSimpleName(), " : ", reply);
ObjectMapper mapper = new ObjectMapper();
if (reply instanceof EmptyReply) {
mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
}
try {
if (reply instanceof FilterableJsonReply) { // ignore specific fields
String[] nonFilteredFields = ((FilterableJsonReply) reply).getNonFilteredFields();
FilterProvider filters = new SimpleFilterProvider().addFilter("filter", SimpleBeanPropertyFilter.filterOutAllExcept(nonFilteredFields));
mapper.writer(filters).writeValue(response.getOutputStream(), reply);
}
else { // write full content
mapper.writeValue(response.getOutputStream(), reply);
}
}
catch (IOException e) {
LOG.error(e);
}
}
} |