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Joakim Uddholm
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Annotation and JSONMappedObj
Annotation and JSONMappedObj to make parsing to object super easy. Just inherit JSONMappedObject and mark any JSON Serializable field with JSONObj
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4 files changed

Lines changed: 444 additions & 327 deletions

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‎JSONMappedObject.java‎

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package org.json;
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import java.lang.reflect.Array;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Field;
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import java.lang.reflect.InvocationTargetException;
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public abstract class JSONMappedObject {
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private static boolean debug = false;
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protected Object getValue(Class<?> type, Object obj) throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException, SecurityException, JSONException
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{
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Object value;
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if(JSONMappedObject.class.isAssignableFrom(type)) {
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// Recursion
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if(debug) System.out.println("Object found");
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Constructor<?> constructor = type.getConstructor(JSONObject.class);
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if(debug) System.out.println("Constructor created");
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value = constructor.newInstance((JSONObject) obj);
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} else if(type.isEnum()) {
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// Enums
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if(debug) System.out.println("Enum found");
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value = Enum.valueOf((Class<Enum>) type, (String) obj);
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} else if(type.isArray()) {
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JSONArray array = (JSONArray) obj;
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Object[] objects = new Object[array.length()];
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for(int i = 0; i < array.length(); i++)
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objects[i] = getValue(type.getComponentType(), array.get(i));
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value = objects;
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} else {
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// Basic type. Or error :(
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if(debug) System.out.println("Basic found");
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value = obj;
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}
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return value;
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}
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protected Object getValue(Class<?> type, String key, JSONObject obj) throws NoSuchMethodException, SecurityException, JSONException, InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException
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{
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Object value;
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if(JSONMappedObject.class.isAssignableFrom(type)) {
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// Recursion
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if(debug) System.out.println("Object found");
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Constructor<?> constructor = type.getConstructor(JSONObject.class);
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if(debug) System.out.println("Constructor created");
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value = constructor.newInstance(obj.getJSONObject(key));
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} else if(type.isEnum()) {
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// Enums
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if(debug) System.out.println("Enum found");
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value = Enum.valueOf((Class<Enum>) type, obj.getString(key));
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} else if(type.isArray()) {
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JSONArray array = obj.getJSONArray(key);
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Object objects = type.cast(Array.newInstance(type.getComponentType(), array.length()));
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for(int i = 0; i < array.length(); i++)
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Array.set(objects, i, type.getComponentType().cast(getValue(type.getComponentType(), array.get(i))));
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value = objects;
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} else {
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// Basic type. Or error :(
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if(debug) System.out.println("Basic found");
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value = obj.get(key);
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}
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return value;
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}
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protected void parseJson(JSONObject obj) throws JSONException, IllegalArgumentException, IllegalAccessException, InstantiationException, NoSuchMethodException, SecurityException, InvocationTargetException {
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if(debug) System.out.println("parseJson called on " + this.getClass().getName());
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Field[] fields = this.getClass().getDeclaredFields();
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for(Field field : fields) {
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if(debug) System.out.println("Checking " + field.getName());
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if(!field.isAnnotationPresent(JSONObj.class))
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continue;
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String key = field.getName();
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Class<?> type = field.getType();
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if(debug) System.out.println("Annotation found on " + key + " type: " + type.getName());
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Object value = getValue(type, key, obj);
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field.set(this, value);
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if(debug) System.out.println("Field set to " + value);
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}
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}
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public JSONMappedObject(JSONObject obj) throws JSONException
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{
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try {
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parseJson(obj);
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} catch (IllegalArgumentException | IllegalAccessException | InstantiationException | NoSuchMethodException | SecurityException | InvocationTargetException e) {
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throw new JSONException(e);
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}
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}
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}

‎JSONObj.java‎

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package org.json;
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import java.lang.annotation.ElementType;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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@Retention(RetentionPolicy.RUNTIME)
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@Target({ElementType.FIELD})
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public @interface JSONObj {
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}

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