cloud.tianai.rpc.common.util.ReflectUtils Maven / Gradle / Ivy
package cloud.tianai.rpc.common.util;
import javassist.CtClass;
import javassist.CtConstructor;
import javassist.CtMethod;
import javassist.NotFoundException;
import org.apache.commons.lang3.StringUtils;
import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.*;
import java.net.URL;
import java.security.CodeSource;
import java.security.ProtectionDomain;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.Future;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static java.util.Arrays.asList;
import static java.util.Collections.unmodifiableSet;
import static org.apache.commons.lang3.ObjectUtils.isEmpty;
/**
* ReflectUtils
*/
public final class ReflectUtils {
/**
* void(V).
*/
public static final char JVM_VOID = 'V';
/**
* boolean(Z).
*/
public static final char JVM_BOOLEAN = 'Z';
/**
* byte(B).
*/
public static final char JVM_BYTE = 'B';
/**
* char(C).
*/
public static final char JVM_CHAR = 'C';
/**
* double(D).
*/
public static final char JVM_DOUBLE = 'D';
/**
* float(F).
*/
public static final char JVM_FLOAT = 'F';
/**
* int(I).
*/
public static final char JVM_INT = 'I';
/**
* long(J).
*/
public static final char JVM_LONG = 'J';
/**
* short(S).
*/
public static final char JVM_SHORT = 'S';
public static final Class[] EMPTY_CLASS_ARRAY = new Class[0];
public static final String JAVA_IDENT_REGEX = "(?:[_$a-zA-Z][_$a-zA-Z0-9]*)";
public static final String JAVA_NAME_REGEX = "(?:" + JAVA_IDENT_REGEX + "(?:\\." + JAVA_IDENT_REGEX + ")*)";
public static final String CLASS_DESC = "(?:L" + JAVA_IDENT_REGEX + "(?:\\/" + JAVA_IDENT_REGEX + ")*;)";
public static final String ARRAY_DESC = "(?:\\[+(?:(?:[VZBCDFIJS])|" + CLASS_DESC + "))";
public static final String DESC_REGEX = "(?:(?:[VZBCDFIJS])|" + CLASS_DESC + "|" + ARRAY_DESC + ")";
public static final Pattern DESC_PATTERN = Pattern.compile(DESC_REGEX);
public static final String METHOD_DESC_REGEX = "(?:(" + JAVA_IDENT_REGEX + ")?\\((" + DESC_REGEX + "*)\\)(" + DESC_REGEX + ")?)";
public static final Pattern METHOD_DESC_PATTERN = Pattern.compile(METHOD_DESC_REGEX);
public static final Pattern GETTER_METHOD_DESC_PATTERN = Pattern.compile("get([A-Z][_a-zA-Z0-9]*)\\(\\)(" + DESC_REGEX + ")");
public static final Pattern SETTER_METHOD_DESC_PATTERN = Pattern.compile("set([A-Z][_a-zA-Z0-9]*)\\((" + DESC_REGEX + ")\\)V");
public static final Pattern IS_HAS_CAN_METHOD_DESC_PATTERN = Pattern.compile("(?:is|has|can)([A-Z][_a-zA-Z0-9]*)\\(\\)Z");
private static final ConcurrentMap> DESC_CLASS_CACHE = new ConcurrentHashMap>();
private static final ConcurrentMap> NAME_CLASS_CACHE = new ConcurrentHashMap>();
private static final ConcurrentMap SIGNATURE_METHODS_CACHE = new ConcurrentHashMap();
private static Map, Object> primitiveDefaults = new HashMap<>();
static {
primitiveDefaults.put(int.class, 0);
primitiveDefaults.put(long.class, 0L);
primitiveDefaults.put(byte.class, (byte) 0);
primitiveDefaults.put(char.class, (char) 0);
primitiveDefaults.put(short.class, (short) 0);
primitiveDefaults.put(float.class, (float) 0);
primitiveDefaults.put(double.class, (double) 0);
primitiveDefaults.put(boolean.class, false);
primitiveDefaults.put(void.class, null);
}
private ReflectUtils() {
}
public static boolean isPrimitives(Class cls) {
if (cls.isArray()) {
return isPrimitive(cls.getComponentType());
}
return isPrimitive(cls);
}
public static boolean isPrimitive(Class cls) {
return cls.isPrimitive() || cls == String.class || cls == Boolean.class || cls == Character.class
|| Number.class.isAssignableFrom(cls) || Date.class.isAssignableFrom(cls);
}
public static Class getBoxedClass(Class c) {
if (c == int.class) {
c = Integer.class;
} else if (c == boolean.class) {
c = Boolean.class;
} else if (c == long.class) {
c = Long.class;
} else if (c == float.class) {
c = Float.class;
} else if (c == double.class) {
c = Double.class;
} else if (c == char.class) {
c = Character.class;
} else if (c == byte.class) {
c = Byte.class;
} else if (c == short.class) {
c = Short.class;
}
return c;
}
/**
* is compatible.
*
* @param c class.
* @param o instance.
* @return compatible or not.
*/
public static boolean isCompatible(Class c, Object o) {
boolean pt = c.isPrimitive();
if (o == null) {
return !pt;
}
if (pt) {
c = getBoxedClass(c);
}
return c == o.getClass() || c.isInstance(o);
}
/**
* is compatible.
*
* @param cs class array.
* @param os object array.
* @return compatible or not.
*/
public static boolean isCompatible(Class[] cs, Object[] os) {
int len = cs.length;
if (len != os.length) {
return false;
}
if (len == 0) {
return true;
}
for (int i = 0; i < len; i++) {
if (!isCompatible(cs[i], os[i])) {
return false;
}
}
return true;
}
public static String getCodeBase(Class cls) {
if (cls == null) {
return null;
}
ProtectionDomain domain = cls.getProtectionDomain();
if (domain == null) {
return null;
}
CodeSource source = domain.getCodeSource();
if (source == null) {
return null;
}
URL location = source.getLocation();
if (location == null) {
return null;
}
return location.getFile();
}
/**
* get name.
* java.lang.Object[][].class => "java.lang.Object[][]"
*
* @param c class.
* @return name.
*/
public static String getName(Class c) {
if (c.isArray()) {
StringBuilder sb = new StringBuilder();
do {
sb.append("[]");
c = c.getComponentType();
}
while (c.isArray());
return c.getName() + sb.toString();
}
return c.getName();
}
public static Class getGenericClass(Class cls) {
return getGenericClass(cls, 0);
}
public static Class getGenericClass(Class cls, int i) {
try {
ParameterizedType parameterizedType = ((ParameterizedType) cls.getGenericInterfaces()[0]);
Object genericClass = parameterizedType.getActualTypeArguments()[i];
// handle nested generic type
if (genericClass instanceof ParameterizedType) {
return (Class) ((ParameterizedType) genericClass).getRawType();
}
// handle array generic type
if (genericClass instanceof GenericArrayType) {
return (Class) ((GenericArrayType) genericClass).getGenericComponentType();
}
// Requires JDK 7 or higher, Foo is no longer GenericArrayType
if (((Class) genericClass).isArray()) {
return ((Class) genericClass).getComponentType();
}
return (Class) genericClass;
} catch (Throwable e) {
throw new IllegalArgumentException(cls.getName() + " generic type undefined!", e);
}
}
/**
* get method name.
* "void do(int)", "void do()", "int do(java.lang.String,boolean)"
*
* @param m method.
* @return name.
*/
public static String getName(final Method m) {
StringBuilder ret = new StringBuilder();
ret.append(getName(m.getReturnType())).append(' ');
ret.append(m.getName()).append('(');
Class[] parameterTypes = m.getParameterTypes();
for (int i = 0; i < parameterTypes.length; i++) {
if (i > 0) {
ret.append(',');
}
ret.append(getName(parameterTypes[i]));
}
ret.append(')');
return ret.toString();
}
public static String getSignature(String methodName, Class[] parameterTypes) {
StringBuilder sb = new StringBuilder(methodName);
sb.append("(");
if (parameterTypes != null && parameterTypes.length > 0) {
boolean first = true;
for (Class type : parameterTypes) {
if (first) {
first = false;
} else {
sb.append(",");
}
sb.append(type.getName());
}
}
sb.append(")");
return sb.toString();
}
/**
* get constructor name.
* "()", "(java.lang.String,int)"
*
* @param c constructor.
* @return name.
*/
public static String getName(final Constructor c) {
StringBuilder ret = new StringBuilder("(");
Class[] parameterTypes = c.getParameterTypes();
for (int i = 0; i < parameterTypes.length; i++) {
if (i > 0) {
ret.append(',');
}
ret.append(getName(parameterTypes[i]));
}
ret.append(')');
return ret.toString();
}
/**
* get class desc.
* boolean[].class => "[Z"
* Object.class => "Ljava/lang/Object;"
*
* @param c class.
* @return desc.
* @throws NotFoundException
*/
public static String getDesc(Class c) {
StringBuilder ret = new StringBuilder();
while (c.isArray()) {
ret.append('[');
c = c.getComponentType();
}
if (c.isPrimitive()) {
String t = c.getName();
if ("void".equals(t)) {
ret.append(JVM_VOID);
} else if ("boolean".equals(t)) {
ret.append(JVM_BOOLEAN);
} else if ("byte".equals(t)) {
ret.append(JVM_BYTE);
} else if ("char".equals(t)) {
ret.append(JVM_CHAR);
} else if ("double".equals(t)) {
ret.append(JVM_DOUBLE);
} else if ("float".equals(t)) {
ret.append(JVM_FLOAT);
} else if ("int".equals(t)) {
ret.append(JVM_INT);
} else if ("long".equals(t)) {
ret.append(JVM_LONG);
} else if ("short".equals(t)) {
ret.append(JVM_SHORT);
}
} else {
ret.append('L');
ret.append(c.getName().replace('.', '/'));
ret.append(';');
}
return ret.toString();
}
/**
* get class array desc.
* [int.class, boolean[].class, Object.class] => "I[ZLjava/lang/Object;"
*
* @param cs class array.
* @return desc.
* @throws NotFoundException
*/
public static String getDesc(final Class[] cs) {
if (cs.length == 0) {
return "";
}
StringBuilder sb = new StringBuilder(64);
for (Class c : cs) {
sb.append(getDesc(c));
}
return sb.toString();
}
/**
* get method desc.
* int do(int arg1) => "do(I)I"
* void do(String arg1,boolean arg2) => "do(Ljava/lang/String;Z)V"
*
* @param m method.
* @return desc.
*/
public static String getDesc(final Method m) {
StringBuilder ret = new StringBuilder(m.getName()).append('(');
Class[] parameterTypes = m.getParameterTypes();
for (int i = 0; i < parameterTypes.length; i++) {
ret.append(getDesc(parameterTypes[i]));
}
ret.append(')').append(getDesc(m.getReturnType()));
return ret.toString();
}
public static String[] getDescArray(final Method m) {
Class[] parameterTypes = m.getParameterTypes();
String[] arr = new String[parameterTypes.length];
for (int i = 0; i < parameterTypes.length; i++) {
arr[i] = getDesc(parameterTypes[i]);
}
return arr;
}
/**
* get constructor desc.
* "()V", "(Ljava/lang/String;I)V"
*
* @param c constructor.
* @return desc
*/
public static String getDesc(final Constructor c) {
StringBuilder ret = new StringBuilder("(");
Class[] parameterTypes = c.getParameterTypes();
for (int i = 0; i < parameterTypes.length; i++) {
ret.append(getDesc(parameterTypes[i]));
}
ret.append(')').append('V');
return ret.toString();
}
/**
* get method desc.
* "(I)I", "()V", "(Ljava/lang/String;Z)V"
*
* @param m method.
* @return desc.
*/
public static String getDescWithoutMethodName(Method m) {
StringBuilder ret = new StringBuilder();
ret.append('(');
Class[] parameterTypes = m.getParameterTypes();
for (int i = 0; i < parameterTypes.length; i++) {
ret.append(getDesc(parameterTypes[i]));
}
ret.append(')').append(getDesc(m.getReturnType()));
return ret.toString();
}
/**
* get class desc.
* Object.class => "Ljava/lang/Object;"
* boolean[].class => "[Z"
*
* @param c class.
* @return desc.
* @throws NotFoundException
*/
public static String getDesc(final CtClass c) throws NotFoundException {
StringBuilder ret = new StringBuilder();
if (c.isArray()) {
ret.append('[');
ret.append(getDesc(c.getComponentType()));
} else if (c.isPrimitive()) {
String t = c.getName();
if ("void".equals(t)) {
ret.append(JVM_VOID);
} else if ("boolean".equals(t)) {
ret.append(JVM_BOOLEAN);
} else if ("byte".equals(t)) {
ret.append(JVM_BYTE);
} else if ("char".equals(t)) {
ret.append(JVM_CHAR);
} else if ("double".equals(t)) {
ret.append(JVM_DOUBLE);
} else if ("float".equals(t)) {
ret.append(JVM_FLOAT);
} else if ("int".equals(t)) {
ret.append(JVM_INT);
} else if ("long".equals(t)) {
ret.append(JVM_LONG);
} else if ("short".equals(t)) {
ret.append(JVM_SHORT);
}
} else {
ret.append('L');
ret.append(c.getName().replace('.', '/'));
ret.append(';');
}
return ret.toString();
}
/**
* get method desc.
* "do(I)I", "do()V", "do(Ljava/lang/String;Z)V"
*
* @param m method.
* @return desc.
*/
public static String getDesc(final CtMethod m) throws NotFoundException {
StringBuilder ret = new StringBuilder(m.getName()).append('(');
CtClass[] parameterTypes = m.getParameterTypes();
for (CtClass parameterType : parameterTypes) {
ret.append(getDesc(parameterType));
}
ret.append(')').append(getDesc(m.getReturnType()));
return ret.toString();
}
/**
* get constructor desc.
* "()V", "(Ljava/lang/String;I)V"
*
* @param c constructor.
* @return desc
*/
public static String getDesc(final CtConstructor c) throws NotFoundException {
StringBuilder ret = new StringBuilder("(");
CtClass[] parameterTypes = c.getParameterTypes();
for (int i = 0; i < parameterTypes.length; i++) {
ret.append(getDesc(parameterTypes[i]));
}
ret.append(')').append('V');
return ret.toString();
}
/**
* get method desc.
* "(I)I", "()V", "(Ljava/lang/String;Z)V".
*
* @param m method.
* @return desc.
*/
public static String getDescWithoutMethodName(final CtMethod m) throws NotFoundException {
StringBuilder ret = new StringBuilder();
ret.append('(');
CtClass[] parameterTypes = m.getParameterTypes();
for (int i = 0; i < parameterTypes.length; i++) {
ret.append(getDesc(parameterTypes[i]));
}
ret.append(')').append(getDesc(m.getReturnType()));
return ret.toString();
}
/**
* name to desc.
* java.util.Map[][] => "[[Ljava/util/Map;"
*
* @param name name.
* @return desc.
*/
public static String name2desc(String name) {
StringBuilder sb = new StringBuilder();
int c = 0, index = name.indexOf('[');
if (index > 0) {
c = (name.length() - index) / 2;
name = name.substring(0, index);
}
while (c-- > 0) {
sb.append("[");
}
if ("void".equals(name)) {
sb.append(JVM_VOID);
} else if ("boolean".equals(name)) {
sb.append(JVM_BOOLEAN);
} else if ("byte".equals(name)) {
sb.append(JVM_BYTE);
} else if ("char".equals(name)) {
sb.append(JVM_CHAR);
} else if ("double".equals(name)) {
sb.append(JVM_DOUBLE);
} else if ("float".equals(name)) {
sb.append(JVM_FLOAT);
} else if ("int".equals(name)) {
sb.append(JVM_INT);
} else if ("long".equals(name)) {
sb.append(JVM_LONG);
} else if ("short".equals(name)) {
sb.append(JVM_SHORT);
} else {
sb.append('L').append(name.replace('.', '/')).append(';');
}
return sb.toString();
}
/**
* desc to name.
* "[[I" => "int[][]"
*
* @param desc desc.
* @return name.
*/
public static String desc2name(String desc) {
StringBuilder sb = new StringBuilder();
int c = desc.lastIndexOf('[') + 1;
if (desc.length() == c + 1) {
switch (desc.charAt(c)) {
case JVM_VOID: {
sb.append("void");
break;
}
case JVM_BOOLEAN: {
sb.append("boolean");
break;
}
case JVM_BYTE: {
sb.append("byte");
break;
}
case JVM_CHAR: {
sb.append("char");
break;
}
case JVM_DOUBLE: {
sb.append("double");
break;
}
case JVM_FLOAT: {
sb.append("float");
break;
}
case JVM_INT: {
sb.append("int");
break;
}
case JVM_LONG: {
sb.append("long");
break;
}
case JVM_SHORT: {
sb.append("short");
break;
}
default:
throw new RuntimeException();
}
} else {
sb.append(desc.substring(c + 1, desc.length() - 1).replace('/', '.'));
}
while (c-- > 0) {
sb.append("[]");
}
return sb.toString();
}
public static Class forName(String name) {
try {
return name2class(name);
} catch (ClassNotFoundException e) {
throw new IllegalStateException("Not found class " + name + ", cause: " + e.getMessage(), e);
}
}
public static Class forName(ClassLoader cl, String name) {
try {
return name2class(cl, name);
} catch (ClassNotFoundException e) {
throw new IllegalStateException("Not found class " + name + ", cause: " + e.getMessage(), e);
}
}
/**
* name to class.
* "boolean" => boolean.class
* "java.util.Map[][]" => java.util.Map[][].class
*
* @param name name.
* @return Class instance.
*/
public static Class name2class(String name) throws ClassNotFoundException {
return name2class(ClassUtils.getClassLoader(), name);
}
/**
* name to class.
* "boolean" => boolean.class
* "java.util.Map[][]" => java.util.Map[][].class
*
* @param cl ClassLoader instance.
* @param name name.
* @return Class instance.
*/
private static Class name2class(ClassLoader cl, String name) throws ClassNotFoundException {
int c = 0, index = name.indexOf('[');
if (index > 0) {
c = (name.length() - index) / 2;
name = name.substring(0, index);
}
if (c > 0) {
StringBuilder sb = new StringBuilder();
while (c-- > 0) {
sb.append("[");
}
if ("void".equals(name)) {
sb.append(JVM_VOID);
} else if ("boolean".equals(name)) {
sb.append(JVM_BOOLEAN);
} else if ("byte".equals(name)) {
sb.append(JVM_BYTE);
} else if ("char".equals(name)) {
sb.append(JVM_CHAR);
} else if ("double".equals(name)) {
sb.append(JVM_DOUBLE);
} else if ("float".equals(name)) {
sb.append(JVM_FLOAT);
} else if ("int".equals(name)) {
sb.append(JVM_INT);
} else if ("long".equals(name)) {
sb.append(JVM_LONG);
} else if ("short".equals(name)) {
sb.append(JVM_SHORT);
} else {
// "java.lang.Object" ==> "Ljava.lang.Object;"
sb.append('L').append(name).append(';');
}
name = sb.toString();
} else {
if ("void".equals(name)) {
return void.class;
}
if ("boolean".equals(name)) {
return boolean.class;
}
if ("byte".equals(name)) {
return byte.class;
}
if ("char".equals(name)) {
return char.class;
}
if ("double".equals(name)) {
return double.class;
}
if ("float".equals(name)) {
return float.class;
}
if ("int".equals(name)) {
return int.class;
}
if ("long".equals(name)) {
return long.class;
}
if ("short".equals(name)) {
return short.class;
}
}
if (cl == null) {
cl = ClassUtils.getClassLoader();
}
Class clazz = NAME_CLASS_CACHE.get(name);
if (clazz == null) {
clazz = Class.forName(name, true, cl);
NAME_CLASS_CACHE.put(name, clazz);
}
return clazz;
}
/**
* desc to class.
* "[Z" => boolean[].class
* "[[Ljava/util/Map;" => java.util.Map[][].class
*
* @param desc desc.
* @return Class instance.
* @throws ClassNotFoundException
*/
public static Class desc2class(String desc) throws ClassNotFoundException {
return desc2class(ClassUtils.getClassLoader(), desc);
}
/**
* desc to class.
* "[Z" => boolean[].class
* "[[Ljava/util/Map;" => java.util.Map[][].class
*
* @param cl ClassLoader instance.
* @param desc desc.
* @return Class instance.
* @throws ClassNotFoundException
*/
private static Class desc2class(ClassLoader cl, String desc) throws ClassNotFoundException {
switch (desc.charAt(0)) {
case JVM_VOID:
return void.class;
case JVM_BOOLEAN:
return boolean.class;
case JVM_BYTE:
return byte.class;
case JVM_CHAR:
return char.class;
case JVM_DOUBLE:
return double.class;
case JVM_FLOAT:
return float.class;
case JVM_INT:
return int.class;
case JVM_LONG:
return long.class;
case JVM_SHORT:
return short.class;
case 'L':
// "Ljava/lang/Object;" ==> "java.lang.Object"
desc = desc.substring(1, desc.length() - 1).replace('/', '.');
break;
case '[':
// "[[Ljava/lang/Object;" ==> "[[Ljava.lang.Object;"
desc = desc.replace('/', '.');
break;
default:
throw new ClassNotFoundException("Class not found: " + desc);
}
if (cl == null) {
cl = ClassUtils.getClassLoader();
}
Class clazz = DESC_CLASS_CACHE.get(desc);
if (clazz == null) {
clazz = Class.forName(desc, true, cl);
DESC_CLASS_CACHE.put(desc, clazz);
}
return clazz;
}
/**
* get class array instance.
*
* @param desc desc.
* @return Class class array.
* @throws ClassNotFoundException
*/
public static Class[] desc2classArray(String desc) throws ClassNotFoundException {
Class[] ret = desc2classArray(ClassUtils.getClassLoader(), desc);
return ret;
}
/**
* get class array instance.
*
* @param cl ClassLoader instance.
* @param desc desc.
* @return Class[] class array.
* @throws ClassNotFoundException
*/
private static Class[] desc2classArray(ClassLoader cl, String desc) throws ClassNotFoundException {
if (desc.length() == 0) {
return EMPTY_CLASS_ARRAY;
}
List> cs = new ArrayList>();
Matcher m = DESC_PATTERN.matcher(desc);
while (m.find()) {
cs.add(desc2class(cl, m.group()));
}
return cs.toArray(EMPTY_CLASS_ARRAY);
}
/**
* Find method from method signature
*
* @param clazz Target class to find method
* @param methodName Method signature, e.g.: method1(int, String). It is allowed to provide method name only, e.g.: method2
* @return target method
* @throws NoSuchMethodException
* @throws ClassNotFoundException
* @throws IllegalStateException when multiple methods are found (overridden method when parameter info is not provided)
*/
public static Method findMethodByMethodSignature(Class clazz, String methodName, String[] parameterTypes)
throws NoSuchMethodException, ClassNotFoundException {
String signature = clazz.getName() + "." + methodName;
if (parameterTypes != null && parameterTypes.length > 0) {
signature += StringUtils.join(parameterTypes);
}
Method method = SIGNATURE_METHODS_CACHE.get(signature);
if (method != null) {
return method;
}
if (parameterTypes == null) {
List finded = new ArrayList();
for (Method m : clazz.getMethods()) {
if (m.getName().equals(methodName)) {
finded.add(m);
}
}
if (finded.isEmpty()) {
throw new NoSuchMethodException("No such method " + methodName + " in class " + clazz);
}
if (finded.size() > 1) {
String msg = String.format("Not unique method for method name(%s) in class(%s), find %d methods.",
methodName, clazz.getName(), finded.size());
throw new IllegalStateException(msg);
}
method = finded.get(0);
} else {
Class[] types = new Class[parameterTypes.length];
for (int i = 0; i < parameterTypes.length; i++) {
types[i] = ReflectUtils.name2class(parameterTypes[i]);
}
method = clazz.getMethod(methodName, types);
}
SIGNATURE_METHODS_CACHE.put(signature, method);
return method;
}
public static Method findMethodByMethodName(Class clazz, String methodName)
throws NoSuchMethodException, ClassNotFoundException {
return findMethodByMethodSignature(clazz, methodName, null);
}
public static Constructor findConstructor(Class clazz, Class paramType) throws NoSuchMethodException {
Constructor targetConstructor;
try {
targetConstructor = clazz.getConstructor(new Class[]{paramType});
} catch (NoSuchMethodException e) {
targetConstructor = null;
Constructor[] constructors = clazz.getConstructors();
for (Constructor constructor : constructors) {
if (Modifier.isPublic(constructor.getModifiers())
&& constructor.getParameterTypes().length == 1
&& constructor.getParameterTypes()[0].isAssignableFrom(paramType)) {
targetConstructor = constructor;
break;
}
}
if (targetConstructor == null) {
throw e;
}
}
return targetConstructor;
}
/**
* Check if one object is the implementation for a given interface.
*
* This method will not trigger classloading for the given interface, therefore it will not lead to error when
* the given interface is not visible by the classloader
*
* @param obj Object to examine
* @param interfaceClazzName The given interface
* @return true if the object implements the given interface, otherwise return false
*/
public static boolean isInstance(Object obj, String interfaceClazzName) {
for (Class clazz = obj.getClass();
clazz != null && !clazz.equals(Object.class);
clazz = clazz.getSuperclass()) {
Class[] interfaces = clazz.getInterfaces();
for (Class itf : interfaces) {
if (itf.getName().equals(interfaceClazzName)) {
return true;
}
}
}
return false;
}
public static Object getEmptyObject(Class returnType) {
return getEmptyObject(returnType, new HashMap<>(), 0);
}
private static Object getEmptyObject(Class returnType, Map, Object> emptyInstances, int level) {
if (level > 2) {
return null;
}
if (returnType == null) {
return null;
}
if (returnType == boolean.class || returnType == Boolean.class) {
return false;
}
if (returnType == char.class || returnType == Character.class) {
return '\0';
}
if (returnType == byte.class || returnType == Byte.class) {
return (byte) 0;
}
if (returnType == short.class || returnType == Short.class) {
return (short) 0;
}
if (returnType == int.class || returnType == Integer.class) {
return 0;
}
if (returnType == long.class || returnType == Long.class) {
return 0L;
}
if (returnType == float.class || returnType == Float.class) {
return 0F;
}
if (returnType == double.class || returnType == Double.class) {
return 0D;
}
if (returnType.isArray()) {
return Array.newInstance(returnType.getComponentType(), 0);
}
if (returnType.isAssignableFrom(ArrayList.class)) {
return new ArrayList<>(0);
}
if (returnType.isAssignableFrom(HashSet.class)) {
return new HashSet<>(0);
}
if (returnType.isAssignableFrom(HashMap.class)) {
return new HashMap<>(0);
}
if (String.class.equals(returnType)) {
return "";
}
if (returnType.isInterface()) {
return null;
}
try {
Object value = emptyInstances.get(returnType);
if (value == null) {
value = returnType.newInstance();
emptyInstances.put(returnType, value);
}
Class cls = value.getClass();
while (cls != null && cls != Object.class) {
Field[] fields = cls.getDeclaredFields();
for (Field field : fields) {
if (field.isSynthetic()) {
continue;
}
Object property = getEmptyObject(field.getType(), emptyInstances, level + 1);
if (property != null) {
try {
if (!field.isAccessible()) {
field.setAccessible(true);
}
field.set(value, property);
} catch (Throwable ignored) {
}
}
}
cls = cls.getSuperclass();
}
return value;
} catch (Throwable e) {
return null;
}
}
public static Object defaultReturn(Method m) {
if (m.getReturnType().isPrimitive()) {
return primitiveDefaults.get(m.getReturnType());
} else {
return null;
}
}
public static Object defaultReturn(Class classType) {
if (classType != null && classType.isPrimitive()) {
return primitiveDefaults.get(classType);
} else {
return null;
}
}
public static boolean isBeanPropertyReadMethod(Method method) {
return method != null
&& Modifier.isPublic(method.getModifiers())
&& !Modifier.isStatic(method.getModifiers())
&& method.getReturnType() != void.class
&& method.getDeclaringClass() != Object.class
&& method.getParameterTypes().length == 0
&& ((method.getName().startsWith("get") && method.getName().length() > 3)
|| (method.getName().startsWith("is") && method.getName().length() > 2));
}
public static String getPropertyNameFromBeanReadMethod(Method method) {
if (isBeanPropertyReadMethod(method)) {
if (method.getName().startsWith("get")) {
return method.getName().substring(3, 4).toLowerCase()
+ method.getName().substring(4);
}
if (method.getName().startsWith("is")) {
return method.getName().substring(2, 3).toLowerCase()
+ method.getName().substring(3);
}
}
return null;
}
public static boolean isBeanPropertyWriteMethod(Method method) {
return method != null
&& Modifier.isPublic(method.getModifiers())
&& !Modifier.isStatic(method.getModifiers())
&& method.getDeclaringClass() != Object.class
&& method.getParameterTypes().length == 1
&& method.getName().startsWith("set")
&& method.getName().length() > 3;
}
public static String getPropertyNameFromBeanWriteMethod(Method method) {
if (isBeanPropertyWriteMethod(method)) {
return method.getName().substring(3, 4).toLowerCase()
+ method.getName().substring(4);
}
return null;
}
public static boolean isPublicInstanceField(Field field) {
return Modifier.isPublic(field.getModifiers())
&& !Modifier.isStatic(field.getModifiers())
&& !Modifier.isFinal(field.getModifiers())
&& !field.isSynthetic();
}
public static Map getBeanPropertyFields(Class cl) {
Map properties = new HashMap();
for (; cl != null; cl = cl.getSuperclass()) {
Field[] fields = cl.getDeclaredFields();
for (Field field : fields) {
if (Modifier.isTransient(field.getModifiers())
|| Modifier.isStatic(field.getModifiers())) {
continue;
}
field.setAccessible(true);
properties.put(field.getName(), field);
}
}
return properties;
}
public static Map getBeanPropertyReadMethods(Class cl) {
Map properties = new HashMap();
for (; cl != null; cl = cl.getSuperclass()) {
Method[] methods = cl.getDeclaredMethods();
for (Method method : methods) {
if (isBeanPropertyReadMethod(method)) {
method.setAccessible(true);
String property = getPropertyNameFromBeanReadMethod(method);
properties.put(property, method);
}
}
}
return properties;
}
public static Type[] getReturnTypes(Method method) {
Class returnType = method.getReturnType();
Type genericReturnType = method.getGenericReturnType();
if (Future.class.isAssignableFrom(returnType)) {
if (genericReturnType instanceof ParameterizedType) {
Type actualArgType = ((ParameterizedType) genericReturnType).getActualTypeArguments()[0];
if (actualArgType instanceof ParameterizedType) {
returnType = (Class) ((ParameterizedType) actualArgType).getRawType();
genericReturnType = actualArgType;
} else {
returnType = (Class) actualArgType;
genericReturnType = returnType;
}
} else {
returnType = null;
genericReturnType = null;
}
}
return new Type[]{returnType, genericReturnType};
}
/**
* Find the {@link Set} of {@link ParameterizedType}
*
* @param sourceClass the source {@link Class class}
* @return non-null read-only {@link Set}
* @since 2.7.5
*/
public static Set findParameterizedTypes(Class sourceClass) {
// Add Generic Interfaces
List genericTypes = new LinkedList<>(asList(sourceClass.getGenericInterfaces()));
// Add Generic Super Class
genericTypes.add(sourceClass.getGenericSuperclass());
Set parameterizedTypes = genericTypes.stream()
.filter(type -> type instanceof ParameterizedType)// filter ParameterizedType
.map(type -> ParameterizedType.class.cast(type)) // cast to ParameterizedType
.collect(Collectors.toSet());
if (parameterizedTypes.isEmpty()) { // If not found, try to search super types recursively
genericTypes.stream()
.filter(type -> type instanceof Class)
.map(type -> Class.class.cast(type))
.forEach(superClass -> {
parameterizedTypes.addAll(findParameterizedTypes(superClass));
});
}
return unmodifiableSet(parameterizedTypes); // build as a Set
}
/**
* Find the hierarchical types from the source {@link Class class} by specified {@link Class type}.
*
* @param sourceClass the source {@link Class class}
* @param matchType the type to match
* @param the type to match
* @return non-null read-only {@link Set}
* @since 2.7.5
*/
public static Set> findHierarchicalTypes(Class sourceClass, Class matchType) {
if (sourceClass == null) {
return Collections.emptySet();
}
Set> hierarchicalTypes = new LinkedHashSet<>();
if (matchType.isAssignableFrom(sourceClass)) {
hierarchicalTypes.add((Class) sourceClass);
}
// Find all super classes
hierarchicalTypes.addAll(findHierarchicalTypes(sourceClass.getSuperclass(), matchType));
return unmodifiableSet(hierarchicalTypes);
}
/**
* Get the value from the specified bean and its property.
*
* @param bean the bean instance
* @param propertyName the name of property
* @param the type of property value
* @return
* @since 2.7.5
*/
public static T getProperty(Object bean, String propertyName) {
Class beanClass = bean.getClass();
BeanInfo beanInfo = null;
T propertyValue = null;
try {
beanInfo = Introspector.getBeanInfo(beanClass);
propertyValue = (T) Stream.of(beanInfo.getPropertyDescriptors())
.filter(propertyDescriptor -> propertyName.equals(propertyDescriptor.getName()))
.map(PropertyDescriptor::getReadMethod)
.findFirst()
.map(method -> {
try {
return method.invoke(bean);
} catch (Exception e) {
}
return null;
}).get();
} catch (Exception e) {
}
return propertyValue;
}
/**
* Resolve the types of the specified values
*
* @param values the values
* @return If can't be resolved, return {@link ReflectUtils#EMPTY_CLASS_ARRAY empty class array}
* @since 2.7.6
*/
public static Class[] resolveTypes(Object... values) {
if (isEmpty(values)) {
return EMPTY_CLASS_ARRAY;
}
int size = values.length;
Class[] types = new Class[size];
for (int i = 0; i < size; i++) {
Object value = values[i];
types[i] = value == null ? null : value.getClass();
}
return types;
}
}