Implmenet reflection json conversion

1 files changed, 120 insertions, 0 deletions

diff --git a/src/org/traccar/http/JsonConverter.java b/src/org/traccar/http/JsonConverter.java
new file mode 100644
index 000000000..1b02e33d2
--- /dev/null
+++ b/src/org/traccar/http/JsonConverter.java
@@ -0,0 +1,120 @@
+/*
+ * Copyright 2015 Anton Tananaev (anton.tananaev@gmail.com)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.http;
+
+import java.beans.Introspector;
+import java.io.Reader;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.text.DateFormat;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Collection;
+import java.util.Date;
+import javax.json.Json;
+import javax.json.JsonArray;
+import javax.json.JsonArrayBuilder;
+import javax.json.JsonObject;
+import javax.json.JsonObjectBuilder;
+import org.traccar.model.Factory;
+
+public class JsonConverter {
+        
+    public static final DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ssZ");
+    
+    public static <T extends Factory> T objectFromJson(Reader reader, T prototype) throws ParseException {
+        return objectFromJson(Json.createReader(reader).readObject(), prototype);
+    }
+    
+    public static <T extends Factory> T objectFromJson(JsonObject json, T prototype) throws ParseException {
+
+        T object = (T) prototype.create();
+        
+        Method[] methods = prototype.getClass().getMethods();
+        
+        for (final Method method : methods) {
+            if (method.getName().startsWith("set") && method.getParameterTypes().length == 1) {
+
+                final String name = Introspector.decapitalize(method.getName().substring(3));
+                Class<?> parameterType = method.getParameterTypes()[0];
+                
+                if (json.containsKey(name)) try {
+                    if (parameterType.equals(boolean.class)) {
+                        method.invoke(object, json.getBoolean(name));
+                    } else if (parameterType.equals(int.class)) {
+                        method.invoke(object, json.getJsonNumber(name).intValue());
+                    } else if (parameterType.equals(long.class)) {
+                        method.invoke(object, json.getJsonNumber(name).longValue());
+                    } else if (parameterType.equals(double.class)) {
+                        method.invoke(object, json.getJsonNumber(name).doubleValue());
+                    } else if (parameterType.equals(String.class)) {
+                        method.invoke(object, json.getString(name));
+                    } else if (parameterType.equals(Date.class)) {
+                        method.invoke(object, dateFormat.parse(json.getString(name)));
+                    }
+                } catch (IllegalAccessException error) {
+                } catch (InvocationTargetException error) {
+                }
+            }
+        }
+        
+        return object;
+    }
+    
+    public static <T> JsonObject objectToJson(T object) {
+        
+        JsonObjectBuilder json = Json.createObjectBuilder();
+        
+        Method[] methods = object.getClass().getMethods();
+        
+        for (Method method : methods) {
+            if (method.getName().startsWith("get") && method.getParameterTypes().length == 0) {
+                String name = method.getName().substring(3);
+                try {
+                    if (method.getReturnType().equals(boolean.class)) {
+                        json.add(name, (Boolean) method.invoke(object));
+                    } else if (method.getReturnType().equals(int.class)) {
+                        json.add(name, (Integer) method.invoke(object));
+                    } else if (method.getReturnType().equals(long.class)) {
+                        json.add(name, (Long) method.invoke(object));
+                    } else if (method.getReturnType().equals(double.class)) {
+                        json.add(name, (Double) method.invoke(object));
+                    } else if (method.getReturnType().equals(String.class)) {
+                        json.add(name, (String) method.invoke(object));
+                    } else if (method.getReturnType().equals(Date.class)) {
+                        json.add(name, dateFormat.format((Date) method.invoke(object)));
+                    }
+                } catch (IllegalAccessException error) {
+                } catch (InvocationTargetException error) {
+                }
+            }
+        }
+
+        return json.build();
+    }
+
+    public static JsonArray arrayToJson(Collection<?> array) {
+
+        JsonArrayBuilder json = Json.createArrayBuilder();
+        
+        for (Object object : array) {
+            json.add(objectToJson(object));
+        }
+
+        return json.build();
+    }
+
+}