use jax rs instead of wicket for rest api

src/main/java/com/commafeed/frontend/rest/JSONMessageBodyWriter.java

@@ -0,0 +1,74 @@
+package com.commafeed.frontend.rest;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Type;
+import java.text.SimpleDateFormat;
+import java.util.Calendar;
+import java.util.Date;
+
+import javax.ws.rs.Produces;
+import javax.ws.rs.WebApplicationException;
+import javax.ws.rs.core.HttpHeaders;
+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 org.apache.commons.io.IOUtils;
+import org.apache.commons.lang.time.DateUtils;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonPrimitive;
+import com.google.gson.JsonSerializationContext;
+import com.google.gson.JsonSerializer;
+
+@Provider
+@Produces(MediaType.APPLICATION_JSON)
+public class JSONMessageBodyWriter implements MessageBodyWriter<Object> {
+
+	@Override
+	public boolean isWriteable(Class<?> type, Type genericType,
+			Annotation[] annotations, MediaType mediaType) {
+		return true;
+	}
+
+	@Override
+	public long getSize(Object t, Class<?> type, Type genericType,
+			Annotation[] annotations, MediaType mediaType) {
+		return -1;
+	}
+
+	@Override
+	public void writeTo(Object t, Class<?> type, Type genericType,
+			Annotation[] annotations, MediaType mediaType,
+			MultivaluedMap<String, Object> httpHeaders,
+			OutputStream entityStream) throws IOException,
+			WebApplicationException {
+		httpHeaders.putSingle(HttpHeaders.CONTENT_TYPE, mediaType.toString()
+				+ ";charset=UTF-8");
+
+		Gson gson = new GsonBuilder().registerTypeAdapter(Date.class,
+				new DateSerializer()).create();
+		IOUtils.write(gson.toJson(t), entityStream, "UTF-8");
+
+	}
+
+	private static class DateSerializer implements JsonSerializer<Date> {
+
+		private static final String DAY_FORMAT = "yyyy-MM-dd";
+		private static final String TIME_FORMAT = "HH:mm";
+
+		public JsonElement serialize(Date src, Type typeOfSrc,
+				JsonSerializationContext context) {
+			Date now = Calendar.getInstance().getTime();
+			String format = DateUtils.isSameDay(now, src) ? TIME_FORMAT
+					: DAY_FORMAT;
+			return new JsonPrimitive(new SimpleDateFormat(format).format(src));
+		}
+	}
+
+}