Exemplo n.º 1
0
 /**
  * A helper method that returns the parsed default value of a given NamedParameter.
  *
  * @return null or an empty set if there is no default value, the default value (or set of values)
  *     otherwise.
  * @throws ClassHierarchyException if a default value was specified, but could not be parsed, or
  *     if a set of values were specified for a non-set parameter.
  */
 @SuppressWarnings("unchecked")
 @Override
 public <T> T parseDefaultValue(final NamedParameterNode<T> name) {
   final String[] vals = name.getDefaultInstanceAsStrings();
   final T[] ret = (T[]) new Object[vals.length];
   for (int i = 0; i < vals.length; i++) {
     final String val = vals[i];
     try {
       ret[i] = parse(name, val);
     } catch (final ParseException e) {
       throw new ClassHierarchyException("Could not parse default value", e);
     }
   }
   if (name.isSet()) {
     return (T) new HashSet<T>(Arrays.asList(ret));
   } else if (name.isList()) {
     return (T) new ArrayList<T>(Arrays.asList(ret));
   } else {
     if (ret.length == 0) {
       return null;
     } else if (ret.length == 1) {
       return ret[0];
     } else {
       throw new IllegalStateException(
           "Multiple defaults for non-set named parameter! " + name.getFullName());
     }
   }
 }
Exemplo n.º 2
0
  private Node register(final String s) {
    final Class<?> c;
    try {
      c = classForName(s);
    } catch (final ClassNotFoundException e1) {
      return null;
    }
    try {
      final Node n = getAlreadyBoundNode(c);
      return n;
    } catch (final NameResolutionException e) {
      // node not bound yet
    }
    // First, walk up the class hierarchy, registering all out parents. This
    // can't be loopy.
    if (c.getSuperclass() != null) {
      register(ReflectionUtilities.getFullName(c.getSuperclass()));
    }
    for (final Class<?> i : c.getInterfaces()) {
      register(ReflectionUtilities.getFullName(i));
    }
    // Now, we'd like to register our enclosing classes. This turns out to be
    // safe.
    // Thankfully, Java doesn't allow:
    // class A implements A.B { class B { } }

    // It also doesn't allow cycles such as:
    // class A implements B.BB { interface AA { } }
    // class B implements A.AA { interface BB { } }

    // So, even though grafting arbitrary DAGs together can give us cycles, Java
    // seems
    // to have our back on this one.
    final Class<?> enclosing = c.getEnclosingClass();
    if (enclosing != null) {
      register(ReflectionUtilities.getFullName(enclosing));
    }

    // Now register the class. This has to be after the above so we know our
    // parents (superclasses and enclosing packages) are already registered.
    final Node n = registerClass(c);

    // Finally, do things that might introduce cycles that invlove c.
    // This has to be below registerClass, which ensures that any cycles
    // this stuff introduces are broken.
    for (final Class<?> innerClass : c.getDeclaredClasses()) {
      register(ReflectionUtilities.getFullName(innerClass));
    }
    if (n instanceof ClassNode) {
      final ClassNode<?> cls = (ClassNode<?>) n;
      for (final ConstructorDef<?> def : cls.getInjectableConstructors()) {
        for (final ConstructorArg arg : def.getArgs()) {
          register(arg.getType());
          if (arg.getNamedParameterName() != null) {
            final NamedParameterNode<?> np =
                (NamedParameterNode<?>) register(arg.getNamedParameterName());
            try {
              // TODO: When handling sets, need to track target of generic parameter, and check the
              // type here!
              if (!np.isSet()
                  && !np.isList()
                  && !ReflectionUtilities.isCoercable(
                      classForName(arg.getType()), classForName(np.getFullArgName()))) {
                throw new ClassHierarchyException(
                    "Named parameter type mismatch in "
                        + cls.getFullName()
                        + ".  Constructor expects a "
                        + arg.getType()
                        + " but "
                        + np.getName()
                        + " is a "
                        + np.getFullArgName());
              }
            } catch (final ClassNotFoundException e) {
              throw new ClassHierarchyException(
                  "Constructor refers to unknown class " + arg.getType(), e);
            }
          }
        }
      }
    } else if (n instanceof NamedParameterNode) {
      final NamedParameterNode<?> np = (NamedParameterNode<?>) n;
      register(np.getFullArgName());
    }
    return n;
  }