/**
* 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);
}
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;
}
}
}
}
public Constructor[] getAllConstructorsFromClass(Class c) {
Constructor[] cList;
cList = c.getDeclaredConstructors();
return cList;
}
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.");
}
}
}
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++;
}
}
}
/**
* すべてのメンバを表示する
*
* @param Class<?> c メンバを表示したいクラス型オブジェクト
*/
public static void printAllMembers(Class<?> c) {
System.out.println("クラス: ");
System.out.println(c);
System.out.println("フィールド: ");
Field[] declaredfields = c.getDeclaredFields();
Field[] fields = c.getFields();
ArrayList<Field> fieldList = new ArrayList<Field>(fields.length);
for (int i = 0; i < fields.length; i++) {
fieldList.add(fields[i]);
}
for (int i = 0; i < declaredfields.length; i++) {
if (!fieldList.contains(declaredfields[i])) {
fieldList.add(declaredfields[i]);
}
}
Field[] allFields = new Field[fieldList.size()];
for (int i = 0; i < allFields.length; i++) {
allFields[i] = fieldList.get(i);
}
printMembers(allFields);
System.out.println("コンストラクタ: ");
Constructor[] declaredconstructors = c.getDeclaredConstructors();
Constructor[] constructors = c.getConstructors();
ArrayList<Constructor> constructorList = new ArrayList<Constructor>(constructors.length);
for (int i = 0; i < constructors.length; i++) {
constructorList.add(constructors[i]);
}
for (int i = 0; i < declaredconstructors.length; i++) {
if (!constructorList.contains(declaredconstructors[i])) {
constructorList.add(declaredconstructors[i]);
}
}
Constructor[] allConstructors = new Constructor[constructorList.size()];
for (int i = 0; i < allConstructors.length; i++) {
allConstructors[i] = constructorList.get(i);
}
printMembers(allConstructors);
System.out.println("メソッド: ");
Method[] declaredmethods = c.getDeclaredMethods();
Method[] methods = c.getMethods();
ArrayList<Method> methodList = new ArrayList<Method>(methods.length);
for (int i = 0; i < methods.length; i++) {
methodList.add(methods[i]);
}
for (int i = 0; i < declaredmethods.length; i++) {
if (!methodList.contains(declaredmethods[i])) {
methodList.add(declaredmethods[i]);
}
}
Method[] allMethods = new Method[methodList.size()];
for (int i = 0; i < allMethods.length; i++) {
allMethods[i] = methodList.get(i);
}
printMembers(allMethods);
}
public static void initializeClass(final Class<?> theClass) {
final Constructor<?>[] cons = theClass.getDeclaredConstructors();
if (cons != null && cons.length > 0 && cons[0] != null) {
final String[] strs = new String[256];
try {
cons[0].newInstance((Object[]) strs);
} catch (Exception ex) {
}
}
}
public static void main(String[] args) throws Exception {
Class<ClassTest> clazz = ClassTest.class;
System.out.println("=============================================");
Constructor[] ctors = clazz.getDeclaredConstructors();
System.out.println("classTest的全部构造器如下：");
for (Constructor c : ctors) {
System.out.println(c);
}
System.out.println("=============================================");
Constructor[] publicCtors = clazz.getConstructors();
System.out.println("ClassTest的全部public构造器如下：");
for (Constructor c : publicCtors) {
System.out.println(c);
}
System.out.println("=============================================");
Method[] mtds = clazz.getMethods();
System.out.println("ClassTest的全部public方法如下：");
for (Method md : mtds) {
System.out.println(md);
}
System.out.println("=============================================");
System.out.println("ClassTest带一个字符串参数的info方法为：" + clazz.getMethod("info", String.class));
Annotation[] ans = clazz.getAnnotations();
System.out.println("ClassTest的全部annotation为：");
for (Annotation an : ans) {
System.out.println(an);
}
System.out.println("该元素上的@SuppressWarnings注释为：" + clazz.getAnnotation(SuppressWarnings.class));
System.out.println("=============================================");
Class<?>[] inners = clazz.getDeclaredClasses();
System.out.println("ClassTest的全部内部类如下：");
for (Class c : inners) {
System.out.println(c);
}
System.out.println("=============================================");
Class inClazz = Class.forName("ClassTest$Inner");
System.out.println("inClazz对应的外部类为：" + inClazz.getDeclaringClass());
System.out.println("ClassTest的包为：" + clazz.getPackage());
System.out.println("ClassTest的父类：" + clazz.getSuperclass());
}
protected void loadClassDependencies(Class aClass) throws ClassNotFoundException {
String name = aClass.getName();
if (myVisited.add(aClass)) {
try {
for (Method method : aClass.getDeclaredMethods()) {
loadTypeDependencies(method.getGenericReturnType());
for (Type type : method.getGenericExceptionTypes()) {
loadTypeDependencies(type);
}
for (Type type : method.getGenericParameterTypes()) {
loadTypeDependencies(type);
}
}
for (Constructor method : aClass.getDeclaredConstructors()) {
for (Type type : method.getGenericExceptionTypes()) {
loadTypeDependencies(type);
}
for (Type type : method.getGenericParameterTypes()) {
loadTypeDependencies(type);
}
}
for (Field field : aClass.getDeclaredFields()) {
loadTypeDependencies(field.getGenericType());
}
Type superclass = aClass.getGenericSuperclass();
if (superclass != null) {
loadClassDependencies(aClass);
}
for (Type intf : aClass.getGenericInterfaces()) {
loadTypeDependencies(intf);
}
aClass.getAnnotations();
Package aPackage = aClass.getPackage();
if (aPackage != null) {
aPackage.getAnnotations();
}
} catch (LinkageError e) {
throw new ClassNotFoundException(name);
} catch (TypeNotPresentException e) {
throw new ClassNotFoundException(name);
}
}
}
public static void printConstructors(Class<?> c) {
display2.append("コンストラクタ\r\n");
Constructor[] declaredconstructors = c.getDeclaredConstructors();
Constructor[] constructors = c.getConstructors();
ArrayList<Constructor> constructorList = new ArrayList<Constructor>(constructors.length);
for (int i = 0; i < constructors.length; i++) {
constructorList.add(constructors[i]);
}
for (int i = 0; i < declaredconstructors.length; i++) {
if (!constructorList.contains(declaredconstructors[i])) {
constructorList.add(declaredconstructors[i]);
}
}
Constructor[] allConstructors = new Constructor[constructorList.size()];
for (int i = 0; i < allConstructors.length; i++) {
allConstructors[i] = constructorList.get(i);
}
printMembers(allConstructors);
}
/**
* 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 configureClassNode(CompileUnit compileUnit, ClassNode classNode) {
Class clazz = classNode.getTypeClass();
Field[] fields = clazz.getDeclaredFields();
for (Field f : fields) {
ClassNode ret = makeClassNode(compileUnit, f.getGenericType(), f.getType());
classNode.addField(f.getName(), f.getModifiers(), ret, null);
}
Method[] methods = clazz.getDeclaredMethods();
for (Method m : methods) {
ClassNode ret = makeClassNode(compileUnit, m.getGenericReturnType(), m.getReturnType());
Parameter[] params =
makeParameters(compileUnit, m.getGenericParameterTypes(), m.getParameterTypes());
ClassNode[] exceptions =
makeClassNodes(compileUnit, m.getGenericExceptionTypes(), m.getExceptionTypes());
MethodNode mn = new MethodNode(m.getName(), m.getModifiers(), ret, params, exceptions, null);
setMethodDefaultValue(mn, m);
setAnnotationMetaData(m.getAnnotations(), mn);
mn.setGenericsTypes(configureTypeVariable(m.getTypeParameters()));
classNode.addMethod(mn);
}
Constructor[] constructors = clazz.getDeclaredConstructors();
for (Constructor ctor : constructors) {
Parameter[] params =
makeParameters(compileUnit, ctor.getGenericParameterTypes(), ctor.getParameterTypes());
ClassNode[] exceptions =
makeClassNodes(compileUnit, ctor.getGenericExceptionTypes(), ctor.getExceptionTypes());
classNode.addConstructor(ctor.getModifiers(), params, exceptions, null);
}
Class sc = clazz.getSuperclass();
if (sc != null)
classNode.setUnresolvedSuperClass(
makeClassNode(compileUnit, clazz.getGenericSuperclass(), sc));
makeInterfaceTypes(compileUnit, classNode, clazz);
setAnnotationMetaData(classNode.getTypeClass().getAnnotations(), classNode);
PackageNode packageNode = classNode.getPackage();
if (packageNode != null) {
setAnnotationMetaData(classNode.getTypeClass().getPackage().getAnnotations(), packageNode);
}
}
/**
* Return true if the type is not abstract and not an interface, and has a constructor annotated
* with {@link Inject} or its only constructor is the default constructor.
*
* @param type A class type
* @return True if the class type is instantiable
*/
public static boolean isInstantiable(Class<?> type) {
if (!Modifier.isAbstract(type.getModifiers()) && !type.isInterface()) {
// first check for a constructor annotated with @Inject,
// - this doesn't care how many we'll let the injector complain
// if there are more than one
for (Constructor<?> c : type.getDeclaredConstructors()) {
if (c.getAnnotation(Inject.class) != null) {
return true;
}
}
// check if we only have the public default constructor
if (type.getConstructors().length == 1
&& type.getConstructors()[0].getParameterTypes().length == 0) {
return true;
}
}
// no constructor available
return false;
}
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))));
}
}
/**
* すべてのメンバを表示する
*
* @param Class<?> c メンバを表示したいクラス型オブジェクト
* @param String stripped 表示を省略したい文字列
*/
public static void printAllMembers(Class<?> c, String stripped) {
System.out.println(c);
printMembers(c.getDeclaredFields(), stripped);
printMembers(c.getDeclaredConstructors(), stripped);
printMembers(c.getDeclaredMethods(), stripped);
}
/**
* 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);
}
}
}
}
}
