/**
* 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());
}
}
}
/**
* Parse a string, assuming that it is of the type expected by a given NamedParameter.
*
* <p>This method does not deal with sets; if the NamedParameter is set valued, then the provided
* string should correspond to a single member of the set. It is up to the caller to call parse
* once for each value that should be parsed as a member of the set.
*
* @return a non-null reference to the parsed value.
*/
@Override
@SuppressWarnings("unchecked")
public <T> T parse(final NamedParameterNode<T> np, final String value) throws ParseException {
final ClassNode<T> iface;
try {
iface = (ClassNode<T>) getNode(np.getFullArgName());
} catch (final NameResolutionException e) {
throw new IllegalStateException(
"Could not parse validated named parameter argument type. NamedParameter is "
+ np.getFullName()
+ " argument type is "
+ np.getFullArgName());
}
Class<?> clazz;
String fullName;
try {
clazz = classForName(iface.getFullName());
fullName = null;
} catch (final ClassNotFoundException e) {
clazz = null;
fullName = iface.getFullName();
}
try {
if (clazz != null) {
return (T) parameterParser.parse(clazz, value);
} else {
return parameterParser.parse(fullName, value);
}
} catch (final UnsupportedOperationException e) {
try {
final Node impl = getNode(value);
if (impl instanceof ClassNode && isImplementation(iface, (ClassNode<?>) impl)) {
return (T) impl;
}
throw new ParseException(
"Name<"
+ iface.getFullName()
+ "> "
+ np.getFullName()
+ " cannot take non-subclass "
+ impl.getFullName(),
e);
} catch (final NameResolutionException e2) {
throw new ParseException(
"Name<"
+ iface.getFullName()
+ "> "
+ np.getFullName()
+ " cannot take non-class "
+ value,
e);
}
}
}
private <T, U> Node buildPathToNode(final Class<U> clazz) throws ClassHierarchyException {
final String[] path = clazz.getName().split("\\$");
Node root = namespace;
for (int i = 0; i < path.length - 1; i++) {
root = root.get(path[i]);
}
if (root == null) {
throw new NullPointerException();
}
final Node parent = root;
final Type argType = ReflectionUtilities.getNamedParameterTargetOrNull(clazz);
if (argType == null) {
return JavaNodeFactory.createClassNode(parent, clazz);
} else {
// checked inside of NamedParameterNode, using reflection.
@SuppressWarnings("unchecked")
final NamedParameterNode<T> np =
JavaNodeFactory.createNamedParameterNode(
parent, (Class<? extends Name<T>>) clazz, argType);
if (parameterParser.canParse(ReflectionUtilities.getFullName(argType))
&& clazz.getAnnotation(NamedParameter.class).default_class() != Void.class) {
throw new ClassHierarchyException(
"Named parameter "
+ ReflectionUtilities.getFullName(clazz)
+ " defines default implementation for parsable type "
+ ReflectionUtilities.getFullName(argType));
}
final String shortName = np.getShortName();
if (shortName != null) {
final NamedParameterNode<?> oldNode = shortNames.get(shortName);
if (oldNode != null) {
if (oldNode.getFullName().equals(np.getFullName())) {
throw new IllegalStateException(
"Tried to double bind " + oldNode.getFullName() + " to short name " + shortName);
}
throw new ClassHierarchyException(
"Named parameters "
+ oldNode.getFullName()
+ " and "
+ np.getFullName()
+ " have the same short name: "
+ shortName);
}
shortNames.put(shortName, np);
}
return np;
}
}
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;
}
