Get Parameterized Type : Generic « Reflection « Java






  1. Java
  2. Reflection
  3. Generic

Get Parameterized Type

     
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

public abstract class ClassUtils {
  static public ParameterizedType getParameterizedType(Class<?> target) {
    Type[] types = getGenericType(target);
    if (types.length > 0 && types[0] instanceof ParameterizedType) {
      return (ParameterizedType) types[0];
    }
    return null;
  }

  static public Type[] getParameterizedTypes(Class<?> target) {
    Type[] types = getGenericType(target);
    if (types.length > 0 && types[0] instanceof ParameterizedType) {
      return ((ParameterizedType) types[0]).getActualTypeArguments();
    }
    return null;
  }

  static public Type[] getGenericType(Class<?> target) {
    if (target == null)
      return new Type[0];
    Type[] types = target.getGenericInterfaces();
    if (types.length > 0) {
      return types;
    }
    Type type = target.getGenericSuperclass();
    if (type != null) {
      if (type instanceof ParameterizedType) {
        return new Type[] { type };
      }
    }
    return new Type[0];
  }

}








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