JSON enhancements

[lgpl/argeo-commons.git] / server / runtime / org.argeo.server.json / src / main / java / org / argeo / server / json / JsonServerSerializer.java

diff --git a/server/runtime/org.argeo.server.json/src/main/java/org/argeo/server/json/JsonServerSerializer.java b/server/runtime/org.argeo.server.json/src/main/java/org/argeo/server/json/JsonServerSerializer.java
index 96e6d2765d2d2a9727990bc26472432edace50da..3d7361396dcb65f5bbebc503060b758407f5bf21 100644 (file)
--- a/server/runtime/org.argeo.server.json/src/main/java/org/argeo/server/json/JsonServerSerializer.java
+++ b/server/runtime/org.argeo.server.json/src/main/java/org/argeo/server/json/JsonServerSerializer.java
@@ -14,7 +14,13 @@ import org.argeo.server.Serializer;
 import org.argeo.server.ServerSerializer;
 import org.codehaus.jackson.JsonFactory;
 import org.codehaus.jackson.JsonGenerator;
+import org.codehaus.jackson.map.JsonMappingException;
+import org.codehaus.jackson.map.JsonSerializer;
 import org.codehaus.jackson.map.ObjectMapper;
+import org.codehaus.jackson.map.SerializationConfig;
+import org.codehaus.jackson.map.SerializerFactory;
+import org.codehaus.jackson.map.SerializerProvider;
+import org.codehaus.jackson.map.ser.StdSerializerProvider;
 
 public class JsonServerSerializer implements ServerSerializer, Serializer {
        private final static Log log = LogFactory
@@ -22,19 +28,29 @@ public class JsonServerSerializer implements ServerSerializer, Serializer {
 
        private JsonFactory jsonFactory = new JsonFactory();
        private ObjectMapper objectMapper = new ObjectMapper();
+       private SerializerProvider serializerProvider = new CustomSerializerProvider();
 
        private Boolean prettyPrint = false;
 
        private Boolean asHtml = false;
 
-       // private String encoding = "UTF8";
+       private String contentTypeCharset = "UTF-8";
+
+       // private Map<Class<?>,String> ignoredFields = new HashMap<Class<?>,
+       // String>();
+
+       public JsonServerSerializer() {
+               objectMapper.setSerializerProvider(serializerProvider);
+       }
 
        public void serialize(Object obj, HttpServletRequest request,
                        HttpServletResponse response) {
                if (asHtml)
-                       response.setContentType("text/html");
+                       response.setContentType("text/html;charset=" + contentTypeCharset);
                else
-                       response.setContentType("application/json");
+                       response.setContentType("application/json;charset="
+                                       + contentTypeCharset);
+
                try {
                        if (asHtml)
                                response.getWriter().append("<pre>");
@@ -54,15 +70,13 @@ public class JsonServerSerializer implements ServerSerializer, Serializer {
 
                JsonGenerator jsonGenerator = null;
                try {
-
-                       // jsonGenerator = jsonFactory.createJsonGenerator(response
-                       // .getOutputStream(), JsonEncoding.valueOf(encoding));
                        jsonGenerator = jsonFactory.createJsonGenerator(writer);
 
                        if (prettyPrint)
                                jsonGenerator.useDefaultPrettyPrinter();
 
                        objectMapper.writeValue(jsonGenerator, obj);
+                       jsonGenerator.flush();
                } catch (Exception e) {
                        throw new ArgeoException("Cannot serialize " + obj, e);
                } finally {
@@ -109,4 +123,48 @@ public class JsonServerSerializer implements ServerSerializer, Serializer {
        protected ObjectMapper getObjectMapper() {
                return objectMapper;
        }
+
+       public void setContentTypeCharset(String contentTypeCharset) {
+               this.contentTypeCharset = contentTypeCharset;
+       }
+
+       static class CustomSerializerProvider extends StdSerializerProvider {
+
+               public CustomSerializerProvider() {
+                       super();
+               }
+
+               public CustomSerializerProvider(SerializationConfig config,
+                               StdSerializerProvider src, SerializerFactory f) {
+                       super(config, src, f);
+               }
+
+               protected StdSerializerProvider createInstance(
+                               SerializationConfig config, SerializerFactory jsf) {
+                       return new CustomSerializerProvider(config, this, jsf);
+               }
+
+               @Override
+               public JsonSerializer<Object> getUnknownTypeSerializer(
+                               Class<?> unknownType) {
+                       JsonSerializer<Object> res = new JsonSerializer<Object>() {
+                               public void serialize(Object value, JsonGenerator jgen,
+                                               SerializerProvider provider)
+                                               throws JsonMappingException {
+                                       if (log.isDebugEnabled())
+                                               log.warn("Unknown serializer for "
+                                                               + value.getClass().getName());
+                                       try {
+                                               jgen.writeNull();
+                                       } catch (Exception e) {
+                                               throw new ArgeoException("Cannot write null", e);
+                                       }
+                               }
+
+                       };
+
+                       return res;
+               }
+
+       }
 }