Add JacksonJsonizable

extensions/wikidata/src/org/openrefine/wikidata/utils/JacksonJsonizable.java

@@ -0,0 +1,58 @@
+package org.openrefine.wikidata.utils;
+
+import java.io.IOException;
+import java.util.Properties;
+
+import org.json.JSONException;
+import org.json.JSONWriter;
+import org.json.JSONObject;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.core.JsonParseException;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.JsonMappingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import com.google.refine.Jsonizable;
+
+/**
+ * This class is inefficient because it serializes the 
+ * object to string and then deserializes it back. Unfortunately,
+ * this is the only simple way to bridge Jackson to org.json.
+ * This conversion should be removed when (if ?) we migrate OpenRefine
+ * a better JSON library.
+ * 
+ * @author antonin
+ *
+ */
+@JsonIgnoreProperties(ignoreUnknown = true)
+public abstract class JacksonJsonizable implements Jsonizable {
+
+    @Override
+    public void write(JSONWriter writer, Properties options)
+            throws JSONException {
+        ObjectMapper mapper = new ObjectMapper();
+        try {
+            writer.value(new JSONObject(mapper.writeValueAsString(this)));
+        } catch (JsonProcessingException e) {
+            throw new JSONException(e.toString());
+        }
+    }
+    
+    public static <T> T fromJSONClass(JSONObject obj, Class<T> klass) throws JSONException {
+        ObjectMapper mapper = new ObjectMapper();
+        String json = obj.toString();
+        try {
+            return mapper.readValue(json, klass);
+        } catch (JsonParseException e) {
+            e.printStackTrace();
+            throw new JSONException(e.toString());
+        } catch (JsonMappingException e) {
+            e.printStackTrace();
+            throw new JSONException(e.toString());
+        } catch (IOException e) {
+            throw new JSONException(e.toString());
+        }  
+    }
+
+}