Custom Jackson Deserializer Getting Access to Current Field Class

Question

I\'m trying to write a custom deserializer for Jackson and I want to make it generic (generic in the sense of working on any type, not as in \"generics\").

However I

Answer 1

Roughly speaking, and without exception catching and error checking...

JsonToken tok = jp.nextValue();

Field field = findField(jp.getCurrentName());

Class fc = field.getType();

if(fc == int.class) {
   field.setInt(this, jp.getIntValue());
} // handle all the primitive types and String in the same way, then...
} ... else if(tok == JsonToken.START_ARRAY) {
   if(fc.isArray()) {
      // Load into an array
   } else if(Collection.class.isAssignableFrom(fc)) {
      // Load into a collection
   } else {
      // throw
   }
} else if(tok == JsonToken.START_OBJECT) {
   // Recursively create that object from the JSON stream
}

... and loop until tok is END_OBJECT. To find a of the current class by name:

Field findField(String name) {
    for(Class c = getClass(); c != null; c = c.getSuperclass()) {
        for(Field field : c.getDeclaredFields()) {
            if(field.getName().equals(name)) {
                return field;
            }
        }
    }
}