private void validateClass(Class<?> source, ValidationProblemCollector problems) {
int modifiers = source.getModifiers();
if (Modifier.isInterface(modifiers)) {
problems.add("Must be a class, not an interface");
}
if (source.getEnclosingClass() != null) {
if (Modifier.isStatic(modifiers)) {
if (Modifier.isPrivate(modifiers)) {
problems.add("Class cannot be private");
}
} else {
problems.add("Enclosed classes must be static and non private");
}
}
Constructor<?>[] constructors = source.getDeclaredConstructors();
for (Constructor<?> constructor : constructors) {
if (constructor.getParameterTypes().length > 0) {
problems.add("Cannot declare a constructor that takes arguments");
break;
}
}
Field[] fields = source.getDeclaredFields();
for (Field field : fields) {
int fieldModifiers = field.getModifiers();
if (!field.isSynthetic()
&& !(Modifier.isStatic(fieldModifiers) && Modifier.isFinal(fieldModifiers))) {
problems.add(field, "Fields must be static final.");
}
}
}
private void validateNonRuleMethod(Method method, ValidationProblemCollector problems) {
if (!Modifier.isPrivate(method.getModifiers())
&& !Modifier.isStatic(method.getModifiers())
&& !method.isSynthetic()
&& !ModelSchemaUtils.isObjectMethod(method)) {
problems.add(method, "A method that is not annotated as a rule must be private");
}
}
private void validateRuleMethod(
MethodRuleDefinition<?, ?> ruleDefinition,
Method ruleMethod,
ValidationProblemCollector problems) {
if (Modifier.isPrivate(ruleMethod.getModifiers())) {
problems.add(ruleMethod, "A rule method cannot be private");
}
if (Modifier.isAbstract(ruleMethod.getModifiers())) {
problems.add(ruleMethod, "A rule method cannot be abstract");
}
if (ruleMethod.getTypeParameters().length > 0) {
problems.add(ruleMethod, "Cannot have type variables (i.e. cannot be a generic method)");
}
// TODO validations on method: synthetic, bridge methods, varargs, abstract, native
ModelType<?> returnType = ModelType.returnType(ruleMethod);
if (returnType.isRawClassOfParameterizedType()) {
problems.add(
ruleMethod,
"Raw type "
+ returnType
+ " used for return type (all type parameters must be specified of parameterized type)");
}
for (int i = 0; i < ruleDefinition.getReferences().size(); i++) {
ModelReference<?> reference = ruleDefinition.getReferences().get(i);
if (reference.getType().isRawClassOfParameterizedType()) {
problems.add(
ruleMethod,
"Raw type "
+ reference.getType()
+ " used for parameter "
+ (i + 1)
+ " (all type parameters must be specified of parameterized type)");
}
if (reference.getPath() != null) {
try {
ModelPath.validatePath(reference.getPath().toString());
} catch (Exception e) {
problems.add(
ruleDefinition,
"The declared model element path '"
+ reference.getPath()
+ "' used for parameter "
+ (i + 1)
+ " is not a valid path",
e);
}
}
}
}
private <T> CachedRuleSource doExtract(final Class<T> source) {
final ModelType<T> type = ModelType.of(source);
DefaultMethodModelRuleExtractionContext context =
new DefaultMethodModelRuleExtractionContext(type, this);
// TODO - exceptions thrown here should point to some extensive documentation on the concept of
// class rule sources
StructSchema<T> schema = getSchema(source, context);
if (schema == null) {
throw new InvalidModelRuleDeclarationException(context.problems.format());
}
// sort for determinism
Set<Method> methods = new TreeSet<Method>(Ordering.usingToString());
methods.addAll(Arrays.asList(source.getDeclaredMethods()));
ImmutableList.Builder<ModelProperty<?>> implicitInputs = ImmutableList.builder();
ModelProperty<?> target = null;
for (ModelProperty<?> property : schema.getProperties()) {
if (property.isAnnotationPresent(RuleTarget.class)) {
target = property;
} else if (property.isAnnotationPresent(RuleInput.class)
&& !(property.getSchema() instanceof ScalarValueSchema)) {
implicitInputs.add(property);
}
for (WeaklyTypeReferencingMethod<?, ?> method : property.getAccessors()) {
methods.remove(method.getMethod());
}
}
ImmutableList.Builder<ExtractedRuleDetails> rules = ImmutableList.builder();
for (Method method : methods) {
MethodRuleDefinition<?, ?> ruleDefinition =
DefaultMethodRuleDefinition.create(source, method);
ExtractedModelRule rule = getMethodHandler(ruleDefinition, method, context);
if (rule != null) {
rules.add(new ExtractedRuleDetails(ruleDefinition, rule));
}
}
if (context.hasProblems()) {
throw new InvalidModelRuleDeclarationException(context.problems.format());
}
StructBindings<T> bindings = structBindingsStore.getBindings(schema);
if (schema.getProperties().isEmpty()) {
return new StatelessRuleSource(
rules.build(),
Modifier.isAbstract(source.getModifiers())
? new AbstractRuleSourceFactory<T>(schema, bindings, proxyFactory)
: new ConcreteRuleSourceFactory<T>(type));
} else {
return new ParameterizedRuleSource(
rules.build(), target, implicitInputs.build(), schema, bindings, proxyFactory);
}
}