/**
* Create a default object of the given type. Prefers constructors with as few arguments as
* possible. Creates an empty proxy for interfaces.
*
* @param type type to instantiate
* @return default instance
* @throws Exception if the default instance could not be created
*/
private static Object instantiateType(Class<?> type) throws Exception {
if (type.isPrimitive()) return Defaults.defaultValue(type);
else if (type == Void.class) return null;
else if (type.isArray()) return Array.newInstance(type, 0);
else if (type.isInterface())
return Proxy.newProxyInstance(
type.getClassLoader(),
new Class[] {type},
new InvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
return null;
}
});
// Take a constructor with as few params as possible
Constructor constructor = type.getDeclaredConstructors()[0];
for (Constructor<?> c : type.getDeclaredConstructors()) {
if (c.getParameterTypes().length < constructor.getParameterTypes().length) constructor = c;
}
Object[] params = new Object[constructor.getParameterTypes().length];
for (int i = 0; i < constructor.getParameterTypes().length; i++) {
params[i] = instantiateType(constructor.getParameterTypes()[i]);
}
return constructor.newInstance(params);
}
private Filter newInstance(API api) throws Exception {
for (Constructor c : api.filter().getDeclaredConstructors()) {
c.setAccessible(true);
Class[] ps = c.getParameterTypes();
if (ps.length == 1 && RequestArguments.class.isAssignableFrom(ps[0]))
return (Filter) c.newInstance(this);
}
for (Constructor c : api.filter().getDeclaredConstructors()) {
Class[] ps = c.getParameterTypes();
if (ps.length == 0) return (Filter) c.newInstance();
}
throw new Exception("Class " + api.filter().getName() + " must have an empty constructor");
}
@SuppressWarnings("unchecked")
private <T> T _get(Class<T> type, Set<Class<?>> seenTypes) {
if (!seenTypes.add(type)) {
throw new IllegalStateException("Cycle in dependencies for " + type);
}
Object singleton = singletons.get(type);
if (singleton != null) {
return (T) singleton;
}
try {
Constructor<T> constructor = getConstructor(type);
Class<?>[] parameterTypes = constructor.getParameterTypes();
Object[] parameters = new Object[parameterTypes.length];
for (int i = 0; i < parameterTypes.length; i++) {
parameters[i] = _get(parameterTypes[i], seenTypes);
}
T instance = postProcess(constructor.newInstance(parameters));
singletons.put(type, instance);
return instance;
} catch (InstantiationException | IllegalAccessException | InvocationTargetException e) {
throw new IllegalStateException("Unable to create instance of " + type);
}
}
protected void _addConstructorMixIns(Class<?> mixin) {
MemberKey[] ctorKeys = null;
int ctorCount = (_constructors == null) ? 0 : _constructors.size();
for (Constructor<?> ctor : mixin.getDeclaredConstructors()) {
switch (ctor.getParameterTypes().length) {
case 0:
if (_defaultConstructor != null) {
_addMixOvers(ctor, _defaultConstructor, false);
}
break;
default:
if (ctorKeys == null) {
ctorKeys = new MemberKey[ctorCount];
for (int i = 0; i < ctorCount; ++i) {
ctorKeys[i] = new MemberKey(_constructors.get(i).getAnnotated());
}
}
MemberKey key = new MemberKey(ctor);
for (int i = 0; i < ctorCount; ++i) {
if (!key.equals(ctorKeys[i])) {
continue;
}
_addMixOvers(ctor, _constructors.get(i), true);
break;
}
}
}
}
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.");
}
}
}
@SuppressWarnings("unchecked")
public static <T> Constructor<T> findConstructor(Class<T> type, Class<?>... paramTypes) {
Constructor<T>[] ctors = (Constructor<T>[]) type.getConstructors();
for (Constructor<T> ctor : ctors)
if (typesMatch(paramTypes, ctor.getParameterTypes())) return ctor;
return null;
}
public void apply()
throws IllegalAccessException, InvocationTargetException, InstantiationException {
if (type.isEnum()) {
for (T instance : type.getEnumConstants()) {
assertThat(
instance.toString(),
is(
type.getCanonicalName().substring(type.getPackage().getName().length() + 1)
+ "."
+ ((Enum<?>) instance).name()));
}
return;
}
for (Constructor<?> constructor : type.getDeclaredConstructors()) {
if (constructor.isSynthetic() && skipSynthetic) {
continue;
}
constructor.setAccessible(true);
Class<?>[] parameterTypes = constructor.getParameterTypes();
Object[] actualArguments = new Object[parameterTypes.length];
Object[] otherArguments = new Object[parameterTypes.length];
int index = 0;
for (Class<?> parameterType : parameterTypes) {
putInstance(parameterType, actualArguments, otherArguments, index++);
}
int testIndex = 0;
@SuppressWarnings("unchecked")
T instance = (T) constructor.newInstance(actualArguments);
assertThat(instance, is(instance));
assertThat(instance, not(is((Object) null)));
assertThat(instance, not(is(new Object())));
Object similarInstance = constructor.newInstance(actualArguments);
assertThat(instance.hashCode(), is(similarInstance.hashCode()));
assertThat(instance, is(similarInstance));
if (skipToString) {
assertThat(instance.toString(), notNullValue());
} else if (optionalToStringRegex == null) {
checkString(instance);
} else {
assertThat(instance.toString(), new RegexMatcher(optionalToStringRegex));
}
for (Object otherArgument : otherArguments) {
Object[] compareArguments = new Object[actualArguments.length];
int argumentIndex = 0;
for (Object actualArgument : actualArguments) {
if (argumentIndex == testIndex) {
compareArguments[argumentIndex] = otherArgument;
} else {
compareArguments[argumentIndex] = actualArgument;
}
argumentIndex++;
}
Object unlikeInstance = constructor.newInstance(compareArguments);
assertThat(instance.hashCode(), not(is(unlikeInstance)));
assertThat(instance, not(is(unlikeInstance)));
testIndex++;
}
}
}
private Validator newValidator(API api) throws Exception {
for (Constructor c : api.validator().getDeclaredConstructors()) {
c.setAccessible(true);
Class[] ps = c.getParameterTypes();
return (Validator) c.newInstance();
}
return null;
}
/**
* Finds the constructor of the given class that is compatible with the given arguments.
*
* @param type the class to find the constructor of
* @param args the arguments
* @return the constructor
*/
public static Constructor findConstructor(Class<?> type, Object[] args) {
outer:
for (Constructor constructor : type.getConstructors()) {
Class<?>[] paramTypes = constructor.getParameterTypes();
if (paramTypes.length != args.length) continue;
for (int i = 0; i < args.length; i++) {
Object arg = args[i];
if (arg != null && !paramTypes[i].isAssignableFrom(arg.getClass())) continue outer;
if (arg == null && paramTypes[i].isPrimitive()) continue outer;
}
return constructor;
}
throw new GrammarException(
"No constructor found for %s and the given %s arguments", type, args.length);
}
public static <T> T newInstance(
Constructor<T> constructor, boolean strict, Object... parameters) {
if (!strict) parameters = convertArray(parameters, constructor.getParameterTypes());
Class<T> type = constructor.getDeclaringClass();
if (deprecated(type))
escalator.escalate(
"Instantiating a deprecated class: " + type.getName(), BeanUtil.class, null);
try {
return constructor.newInstance(parameters);
} catch (InstantiationException e) {
throw ExceptionMapper.configurationException(e, type);
} catch (IllegalAccessException e) {
throw ExceptionMapper.configurationException(e, type);
} catch (InvocationTargetException e) {
throw ExceptionMapper.configurationException(e, type);
}
}
private static Object createArgumentPlaceholderForUnknownClass(
Class<?> clazz, Integer placeholderId) throws IllegalAccessException, InstantiationException {
FinalClassArgumentCreator<?> creator = FINAL_CLASS_ARGUMENT_CREATORS.get(clazz);
if (creator != null) return creator.createArgumentPlaceHolder(placeholderId);
for (Constructor constructor : clazz.getConstructors()) {
Class<?>[] params = constructor.getParameterTypes();
if (params.length != 1) continue;
try {
if (params[0] == String.class)
return constructor.newInstance(String.valueOf(placeholderId));
if (isNumericClass(params[0])) return constructor.newInstance(placeholderId);
} catch (IllegalAccessException e1) {
} catch (InvocationTargetException e2) {
}
}
return clazz.newInstance();
}
/**
* Prints all constructors of a class
*
* @param cl a class
*/
public static void printConstructors(Class cl) {
Constructor[] constructors = cl.getDeclaredConstructors();
for (Constructor c : constructors) {
String name = c.getName();
System.out.print(" ");
String modifiers = Modifier.toString(c.getModifiers());
if (modifiers.length() > 0) System.out.print(modifiers + " ");
System.out.print(name + "(");
// print parameter types
Class[] paramTypes = c.getParameterTypes();
for (int j = 0; j < paramTypes.length; j++) {
if (j > 0) System.out.print(", ");
System.out.print(paramTypes[j].getName());
}
System.out.println(");");
}
}
public void applyBasic()
throws IllegalAccessException, InvocationTargetException, InstantiationException {
for (Constructor<?> constructor : type.getDeclaredConstructors()) {
if (constructor.isSynthetic() && skipSynthetic) {
continue;
}
constructor.setAccessible(true);
Class<?>[] parameterTypes = constructor.getParameterTypes();
Object[] actualArguments = new Object[parameterTypes.length];
Object[] otherArguments = new Object[parameterTypes.length];
int index = 0;
for (Class<?> parameterType : parameterTypes) {
putInstance(parameterType, actualArguments, otherArguments, index++);
}
@SuppressWarnings("unchecked")
T instance = (T) constructor.newInstance(actualArguments);
checkString(instance);
assertThat(instance, is(instance));
assertThat(instance, not(is((Object) null)));
assertThat(instance, not(is(new Object())));
assertThat(instance, not(is(constructor.newInstance(otherArguments))));
}
}
/**
* Initialization method that will find out all constructors and potential static factory methods
* the class has.
*
* <p>Starting with 1.2, it will also apply mix-in annotations, as per [JACKSON-76]
*
* @param includeAll If true, includes all creator methods; if false, will only include the
* no-arguments "default" constructor
*/
public void resolveCreators(boolean includeAll) {
// Then see which constructors we have
_constructors = null;
for (Constructor<?> ctor : _class.getDeclaredConstructors()) {
switch (ctor.getParameterTypes().length) {
case 0:
_defaultConstructor = _constructConstructor(ctor, true);
break;
default:
if (includeAll) {
if (_constructors == null) {
_constructors = new ArrayList<AnnotatedConstructor>();
}
_constructors.add(_constructConstructor(ctor, false));
}
}
}
// and if need be, augment with mix-ins
if (_primaryMixIn != null) {
if (_defaultConstructor != null || _constructors != null) {
_addConstructorMixIns(_primaryMixIn);
}
}
/* And then... let's remove all constructors that are
* deemed to be ignorable after all annotations have been
* properly collapsed.
*/
if (_defaultConstructor != null) {
if (_annotationIntrospector.isIgnorableConstructor(_defaultConstructor)) {
_defaultConstructor = null;
}
}
if (_constructors != null) {
// count down to allow safe removal
for (int i = _constructors.size(); --i >= 0; ) {
if (_annotationIntrospector.isIgnorableConstructor(_constructors.get(i))) {
_constructors.remove(i);
}
}
}
_creatorMethods = null;
if (includeAll) {
/* Then static methods which are potential factory
* methods
*/
for (Method m : _class.getDeclaredMethods()) {
if (!Modifier.isStatic(m.getModifiers())) {
continue;
}
int argCount = m.getParameterTypes().length;
// factory methods take at least one arg:
if (argCount < 1) {
continue;
}
if (_creatorMethods == null) {
_creatorMethods = new ArrayList<AnnotatedMethod>();
}
_creatorMethods.add(_constructCreatorMethod(m));
}
// mix-ins to mix in?
if (_primaryMixIn != null && _creatorMethods != null) {
_addFactoryMixIns(_primaryMixIn);
}
// anything to ignore at this point?
if (_creatorMethods != null) {
// count down to allow safe removal
for (int i = _creatorMethods.size(); --i >= 0; ) {
if (_annotationIntrospector.isIgnorableMethod(_creatorMethods.get(i))) {
_creatorMethods.remove(i);
}
}
}
}
}
private static void generateCtor(
ClassFileWriter cfw, String adapterName, String superName, Constructor<?> superCtor) {
short locals = 3; // this + factory + delegee
Class<?>[] parameters = superCtor.getParameterTypes();
// Note that we swapped arguments in app-facing constructors to avoid
// conflicting signatures with serial constructor defined below.
if (parameters.length == 0) {
cfw.startMethod(
"<init>",
"(Laurora/javascript/Scriptable;" + "Laurora/javascript/ContextFactory;)V",
ClassFileWriter.ACC_PUBLIC);
// Invoke base class constructor
cfw.add(ByteCode.ALOAD_0); // this
cfw.addInvoke(ByteCode.INVOKESPECIAL, superName, "<init>", "()V");
} else {
StringBuilder sig =
new StringBuilder(
"(Laurora/javascript/Scriptable;" + "Laurora/javascript/ContextFactory;");
int marker = sig.length(); // lets us reuse buffer for super signature
for (Class<?> c : parameters) {
appendTypeString(sig, c);
}
sig.append(")V");
cfw.startMethod("<init>", sig.toString(), ClassFileWriter.ACC_PUBLIC);
// Invoke base class constructor
cfw.add(ByteCode.ALOAD_0); // this
short paramOffset = 3;
for (Class<?> parameter : parameters) {
paramOffset += generatePushParam(cfw, paramOffset, parameter);
}
locals = paramOffset;
sig.delete(1, marker);
cfw.addInvoke(ByteCode.INVOKESPECIAL, superName, "<init>", sig.toString());
}
// Save parameter in instance variable "delegee"
cfw.add(ByteCode.ALOAD_0); // this
cfw.add(ByteCode.ALOAD_1); // first arg: Scriptable delegee
cfw.add(ByteCode.PUTFIELD, adapterName, "delegee", "Laurora/javascript/Scriptable;");
// Save parameter in instance variable "factory"
cfw.add(ByteCode.ALOAD_0); // this
cfw.add(ByteCode.ALOAD_2); // second arg: ContextFactory instance
cfw.add(ByteCode.PUTFIELD, adapterName, "factory", "Laurora/javascript/ContextFactory;");
cfw.add(ByteCode.ALOAD_0); // this for the following PUTFIELD for self
// create a wrapper object to be used as "this" in method calls
cfw.add(ByteCode.ALOAD_1); // the Scriptable delegee
cfw.add(ByteCode.ALOAD_0); // this
cfw.addInvoke(
ByteCode.INVOKESTATIC,
"aurora/javascript/JavaAdapter",
"createAdapterWrapper",
"(Laurora/javascript/Scriptable;"
+ "Ljava/lang/Object;"
+ ")Laurora/javascript/Scriptable;");
cfw.add(ByteCode.PUTFIELD, adapterName, "self", "Laurora/javascript/Scriptable;");
cfw.add(ByteCode.RETURN);
cfw.stopMethod(locals);
}
@SuppressWarnings({"unchecked", "rawtypes"})
public static <T> T newInstance(Class<T> type, boolean strict, Object... parameters) {
if (parameters.length == 0) return newInstanceFromDefaultConstructor(type);
Constructor<T> constructorToUse = null;
try {
Constructor<T>[] constructors = (Constructor<T>[]) type.getConstructors();
List<Constructor<T>> candidates = new ArrayList<Constructor<T>>(constructors.length);
int paramCount = parameters.length;
for (Constructor<T> constructor : constructors)
if (constructor.getParameterTypes().length == paramCount) candidates.add(constructor);
if (candidates.size() == 1) constructorToUse = candidates.get(0);
else if (candidates.size() == 0)
throw new ConfigurationError(
"No constructor with " + paramCount + " parameters found for " + type);
else {
// there are several candidates - find the first one with matching types
Class<?>[] paramTypes = new Class[parameters.length];
for (int i = 0; i < parameters.length; i++) paramTypes[i] = parameters[i].getClass();
for (Constructor c : type.getConstructors()) {
if (typesMatch(c.getParameterTypes(), paramTypes)) {
constructorToUse = c;
break;
}
}
// there is no ideal match
if (constructorToUse == null) {
if (strict)
throw new NoSuchMethodException(
"No appropriate constructor found: "
+ type
+ '('
+ ArrayFormat.format(", ", paramTypes)
+ ')');
Exception mostRecentException = null;
for (Constructor<T> candidate : candidates) {
try {
return newInstance(candidate, strict, parameters);
} catch (Exception e) {
mostRecentException = e;
logger.warn("Exception in constructor call: " + candidate, e);
continue; // ignore exception and try next constructor
}
}
// no constructor could be called without exception
String errMsg =
(mostRecentException != null
? "None of these constructors could be called without exception: "
+ candidates
+ ", latest exception: "
+ mostRecentException
: type
+ " has no appropriate constructor for the arguments "
+ ArrayFormat.format(", ", parameters));
throw new ConfigurationError(errMsg);
}
}
if (!strict) parameters = convertArray(parameters, constructorToUse.getParameterTypes());
return newInstance(constructorToUse, parameters);
} catch (SecurityException e) {
throw ExceptionMapper.configurationException(e, constructorToUse);
} catch (NoSuchMethodException e) {
throw ExceptionMapper.configurationException(e, type);
}
}
