public Object from(Json x) {
try {
return HGUtils.loadClass(graph, x.asString());
} catch (ClassNotFoundException e) {
throw new HGException(e);
}
}
protected T back() {
if (HGUtils.eq(key.getData(), initialKey.getData())) return null;
try {
OperationStatus status = cursor.cursor().getPrev(key, data, LockMode.DEFAULT);
if (status == OperationStatus.SUCCESS)
return converter.fromByteArray(data.getData(), data.getOffset(), data.getSize());
else return null;
} catch (Throwable t) {
closeNoException();
throw new HGException(t);
}
}
@SuppressWarnings("unchecked")
public Object from(Json x) {
Collection<Object> C;
try {
C =
(Collection<Object>)
HGUtils.loadClass(graph, x.at("javaType").asString()).newInstance();
for (Json j : x.at("data").asJsonList()) C.add(value(j));
} catch (Exception e) {
throw new RuntimeException(e);
}
return C;
}
public Json to(Object x) {
String typeName =
shortNameMap.containsX(x.getClass().getName())
? shortNameMap.getY(x.getClass().getName())
: x.getClass().getName();
Json result = Json.object().set("javaType", typeName);
if (x instanceof HGLink) {
result.set("_link", array());
for (int i = 0; i < ((HGLink) x).getArity(); i++)
result.at("_link").add(((HGLink) x).getTargetAt(i));
}
if (x instanceof Collection) {
result.set("_collection", array());
for (Object element : (Collection<?>) x)
result.at("_collection").add(makeProperty(element));
}
if (x instanceof Map) {
result.set("_map", array());
for (Map.Entry<?, ?> e : ((Map<?, ?>) x).entrySet())
result
.at("_map")
.add(
Json.object()
.set("key", makeProperty(e.getKey()))
.set("value", makeProperty(e.getValue())));
}
try {
if (props != null) // user provided list of properties
for (String propname : props) {
PropertyDescriptor desc = BonesOfBeans.getPropertyDescriptor(x, propname);
Object value = BonesOfBeans.getProperty(x, desc);
if (!ignoreNulls || value != null) result.set(propname, makeProperty(value));
}
else // all introspected properties
for (PropertyDescriptor desc : BonesOfBeans.getAllPropertyDescriptors(x).values())
if (desc.getReadMethod() != null && desc.getWriteMethod() != null) {
Object value = BonesOfBeans.getProperty(x, desc);
if (!ignoreNulls || value != null) result.set(desc.getName(), makeProperty(value));
}
return result;
} catch (Throwable ex) {
HGUtils.throwRuntimeException(ex);
}
return null; // unreachable
}
@SuppressWarnings("unchecked")
public Object from(Json x) {
if (!x.isObject()) return x.getValue();
Json typeName = x.at("javaType");
if ("mjson.Json".equals(typeName)) return x.at("value");
if (typeName == null) {
// Not a bean, must be simply a map
HashMap<String, Object> m = new HashMap<String, Object>();
for (Map.Entry<String, Json> e : x.asJsonMap().entrySet())
m.put(e.getKey(), from(e.getValue()));
return m;
}
String fullName = shortNameMap.getX(typeName.asString());
if (fullName == null) fullName = typeName.asString();
if (fullName.equals(String.class.getName())) return x.at("value").getValue();
else if (fullName.equals(Boolean.class.getName())) return x.at("value").getValue();
try {
Class<?> beanClass = HGUtils.loadClass(graph, fullName);
if (Number.class.isAssignableFrom(beanClass)) return castNumber(beanClass, x.at("value"));
// return beanClass.getConstructor(new
// Class[]{String.class}).newInstance(x.at("value").getValue().toString());
else if (Boolean.class.isAssignableFrom(beanClass)) return x.at("value").asBoolean();
Object bean = null;
x = x.at("value");
if (HGLink.class.isAssignableFrom(beanClass) && x.has("_link")) {
HGHandle[] targets = new HGHandle[x.at("_link").asJsonList().size()];
for (int i = 0; i < targets.length; i++) targets[i] = value(x.at("_link").at(i));
bean =
beanClass
.getDeclaredConstructor(new Class[] {HGHandle[].class})
.newInstance(new Object[] {targets});
} else bean = beanClass.newInstance();
if (x.has("_collection"))
for (Json element : x.at("_collection").asJsonList())
((Collection<Object>) bean).add(value(element));
if (x.has("_map"))
for (Json entry : x.at("_map").asJsonList())
((Map<Object, Object>) bean).put(value(entry.at("key")), value(entry.at("value")));
for (Map.Entry<String, Json> entry : x.asJsonMap().entrySet()) {
PropertyDescriptor descriptor = BonesOfBeans.getPropertyDescriptor(bean, entry.getKey());
if (descriptor == null) continue;
Class<?> propertyClass = descriptor.getPropertyType();
Object value = null;
if (descriptor instanceof IndexedPropertyDescriptor) {
int length = entry.getValue().asJsonList().size();
Object A =
Array.newInstance(
((IndexedPropertyDescriptor) descriptor).getIndexedPropertyType(), length);
for (int i = 0; i < length; i++) Array.set(A, i, from(entry.getValue().at(i)));
} else if (propertyClass.equals(Class.class)) {
if (entry.getValue().isString())
value = HGUtils.loadClass(graph, entry.getValue().asString());
else if (!entry.getValue().isNull())
value = HGUtils.loadClass(graph, entry.getValue().at("value").asString());
} else if (entry.getValue().isNumber())
value = castNumber(propertyClass, entry.getValue());
else value = value(entry.getValue());
BonesOfBeans.setProperty(bean, entry.getKey(), value);
}
return bean;
} catch (Exception ex) {
throw new RuntimeException("Failed to JSON-deserialize bean of type " + fullName, ex);
}
}