com.datastax.util.lang.ReflectUtil Maven / Gradle / Ivy
package com.datastax.util.lang;
import com.datastax.util.collection.ConcurrentReferenceHashMap;
import java.lang.reflect.*;
import java.sql.SQLException;
import java.util.*;
public class ReflectUtil {
/**
* Naming prefix for CGLIB-renamed methods.
* @see #isCglibRenamedMethod
*/
private static final String CGLIB_RENAMED_METHOD_PREFIX = "CGLIB$";
private static final Method[] NO_METHODS = {};
private static final Field[] NO_FIELDS = {};
private static Map primitiveMap=initPrimitiveMap();
private static Map initPrimitiveMap() {
primitiveMap=new HashMap<>();
primitiveMap.put("int","java.lang.Integer");
primitiveMap.put("byte","java.lang.Byte");
primitiveMap.put("char","java.lang.Char");
primitiveMap.put("short","java.lang.Short");
primitiveMap.put("long","java.lang.Long");
primitiveMap.put("double","java.lang.Double");
primitiveMap.put("boolean","java.lang.Boolean");
primitiveMap.put("float","java.lang.Float");
return primitiveMap;
}
/**
* Cache for {@link Class#getDeclaredMethods()} plus equivalent default methods
* from Java 8 based interfaces, allowing for fast iteration.
*/
private static final Map, Method[]> declaredMethodsCache =
new ConcurrentReferenceHashMap, Method[]>(256);
/**
* Cache for {@link Class#getDeclaredFields()}, allowing for fast iteration.
*/
private static final Map, Field[]> declaredFieldsCache =
new ConcurrentReferenceHashMap, Field[]>(256);
/**
* Attempt to find a {@link Field field} on the supplied {@link Class} with the
* supplied {@code name}. Searches all superclasses up to {@link Object}.
* @param clazz the class to introspect
* @param name the name of the field
* @return the corresponding Field object, or {@code null} if not found
*/
public static Field findField(Class clazz, String name) {
return findField(clazz, name, null);
}
/**
* Attempt to find a {@link Field field} on the supplied {@link Class} with the
* supplied {@code name} and/or {@link Class type}. Searches all superclasses
* up to {@link Object}.
* @param clazz the class to introspect
* @param name the name of the field (may be {@code null} if type is specified)
* @param type the type of the field (may be {@code null} if name is specified)
* @return the corresponding Field object, or {@code null} if not found
*/
public static Field findField(Class clazz, String name, Class type) {
Class searchType = clazz;
while (Object.class != searchType && searchType != null) {
Field[] fields = getDeclaredFields(searchType);
for (Field field : fields) {
if ((name == null || name.equals(field.getName())) &&
(type == null || type.equals(field.getType()))) {
return field;
}
}
searchType = searchType.getSuperclass();
}
return null;
}
/**
* Set the field represented by the supplied {@link Field field object} on the
* specified {@link Object target object} to the specified {@code value}.
* In accordance with {@link Field#set(Object, Object)} semantics, the new value
* is automatically unwrapped if the underlying field has a primitive type.
* Thrown exceptions are handled via a call to {@link #handleReflectionException(Exception)}.
* @param field the field to set
* @param target the target object on which to set the field
* @param value the value to set (may be {@code null})
*/
public static void setField(Field field, Object target, Object value) {
try {
field.set(target, value);
}
catch (IllegalAccessException ex) {
handleReflectionException(ex);
throw new IllegalStateException(
"Unexpected reflection exception - " + ex.getClass().getName() + ": " + ex.getMessage());
}
}
/**
* Get the field represented by the supplied {@link Field field object} on the
* specified {@link Object target object}. In accordance with {@link Field#get(Object)}
* semantics, the returned value is automatically wrapped if the underlying field
* has a primitive type.
*
Thrown exceptions are handled via a call to {@link #handleReflectionException(Exception)}.
* @param field the field to get
* @param target the target object from which to get the field
* @return the field's current value
*/
public static Object getField(Field field, Object target) {
try {
return field.get(target);
}
catch (IllegalAccessException ex) {
handleReflectionException(ex);
throw new IllegalStateException(
"Unexpected reflection exception - " + ex.getClass().getName() + ": " + ex.getMessage());
}
}
public static Object newInstance(String className,Object...args){
try {
Class cls = Class.forName(className);
if (args.length == 0) {
return cls.newInstance();
}else {
Class[] paramClasses=new Class[args.length];
for(int i=0;iReturns {@code null} if no {@link Method} can be found.
* @param clazz the class to introspect
* @param name the name of the method
* @return the Method object, or {@code null} if none found
*/
public static Method findMethod(Class clazz, String name) {
return findMethod(clazz, name, new Class[0]);
}
public static Method findMethod(Class clazz, String name,String[] classTypes) throws ClassNotFoundException {
Class[] classes=new Class[classTypes.length];
for(int i=0;iReturns {@code null} if no {@link Method} can be found.
* @param clazz the class to introspect
* @param name the name of the method
* @param paramTypes the parameter types of the method
* (may be {@code null} to indicate any signature)
* @return the Method object, or {@code null} if none found
*/
public static Method findMethod(Class clazz, String name, Class... paramTypes) {
Class searchType = clazz;
while (searchType != null) {
Method[] methods = (searchType.isInterface() ? searchType.getMethods() : getDeclaredMethods(searchType));
for (Method method : methods) {
// if (name.equals(method.getName()) &&
// (paramTypes == null || arrayEquals(paramTypes, method.getParameterTypes()))) {
// return method;
// }
if (name.equals(method.getName()) &&
(paramTypes == null || arrayApprEquals(paramTypes, method.getParameterTypes()))) {
return method;
}
}
searchType = searchType.getSuperclass();
}
return null;
}
private static boolean arrayEquals(Class[] array1,Class[] array2){
if (array1==array2)
return true;
if (array1==null || array2==null)
return false;
int length = array1.length;
if (array2.length != length)
return false;
for (int i=0; iThrown exceptions are handled via a call to {@link #handleReflectionException}.
* @param method the method to invoke
* @param target the target object to invoke the method on
* @return the invocation result, if any
* @see #invokeMethod(java.lang.reflect.Method, Object, Object[])
*/
public static Object invokeMethod(Method method, Object target) {
return invokeMethod(method, target, new Object[0]);
}
/**
* Invoke the specified {@link Method} against the supplied target object with the
* supplied arguments. The target object can be {@code null} when invoking a
* static {@link Method}.
* Thrown exceptions are handled via a call to {@link #handleReflectionException}.
* @param method the method to invoke
* @param target the target object to invoke the method on
* @param args the invocation arguments (may be {@code null})
* @return the invocation result, if any
*/
public static Object invokeMethod(Method method, Object target, Object... args) {
try {
return method.invoke(target, args);
}
catch (Exception ex) {
handleReflectionException(ex);
}
throw new IllegalStateException("Should never get here");
}
public static Object invokeMethod(String methodName,Object target,String[] classTypes, Object... args) {
String className=target.getClass().getTypeName();
try{
Method method = findMethod(target.getClass(), methodName, classTypes);
return method.invoke(target, args);
}catch (NullPointerException e) {
System.out.println("NullPointerException while invoking method：["+className+"."+methodName + "]");
System.out.println("********* argeuments *********");
for (int i = 0; i < args.length; i++) {
System.out.println("argeument[" + i + "] is null: " + Boolean.toString (args[i] == null));
}
System.out.println("********* stack trace *********");
System.out.println(e.toString());
StackTraceElement[] elements = e.getStackTrace();
for (StackTraceElement element : elements) {
System.out.println("\t" + element.toString());
}
if(e.getCause() != null) {
System.out.println("Caused by: " + e.getCause().toString());
StackTraceElement[] causes = e.getCause().getStackTrace();
for (StackTraceElement cause : causes) {
System.out.println("\t" + cause.toString());
}
}
}
catch (Exception ex) {
System.out.println("Exception while invoking method：["+className+"."+methodName + "]");
System.out.println("********* argeuments *********");
for (int i = 0; i < classTypes.length; i++) {
System.out.println("argeument[" + i + "]:" + " accept:" + classTypes[i] + " => found:" + args[i].getClass().getTypeName());
}
System.out.println("********* stack trace *********");
System.out.println(ex.toString());
StackTraceElement[] elements = ex.getStackTrace();
for (StackTraceElement element : elements) {
System.out.println("\t" + element.toString());
}
System.out.println("Caused by: " + ex.getCause().toString());
StackTraceElement[] causes = ex.getCause().getStackTrace();
for (StackTraceElement cause : causes) {
System.out.println("\t" + cause.toString());
}
handleReflectionException(ex);
}
throw new IllegalStateException("Should never get here");
}
public static Object invokeMethod(String methodName,Object target, Object... args) {
String[] classTypes = new String[args.length];
for (int i = 0; i < classTypes.length; i++) {
classTypes[i] = args[i].getClass().getTypeName();
}
return invokeMethod(methodName,target,classTypes,args);
}
public static Object invokeMethod(String className,String methodName, Object... args) {
String[] classTypes=new String[args.length];
for(int i=0;i found:" + (args[i] == null ? "null" : args[i].getClass().getTypeName()));
}
System.out.println("********* stack trace *********");
System.out.println(ex.toString());
StackTraceElement[] elements = ex.getStackTrace();
for (StackTraceElement element : elements) {
System.out.println("\t" + element.toString());
}
System.out.println("Caused by: " + ex.getCause().toString());
StackTraceElement[] causes = ex.getCause().getStackTrace();
for (StackTraceElement cause : causes) {
System.out.println("\t" + cause.toString());
}
handleReflectionException(ex);
}
throw new IllegalStateException("Should never get here");
}
/**
* Invoke the specified static {@link Method} against the supplied target Type with the
* supplied arguments.
* Thrown exceptions are handled via a call to {@link #handleReflectionException}.
* @param className the name of class to introspect
* @param methodName the method to invoke
* @param classTypes the type of arguments
* @param args the invocation arguments (may be {@code null})
* @return the invocation result, if any
*/
public static Object invokeStaticMethod(String className,String methodName,String[] classTypes, Object... args) {
try {
Class cls=Class.forName(className);
Method method=findMethod(cls,methodName,classTypes);
return invokeMethod(method,null, args);
} catch (Exception ex) {
handleReflectionException(ex);
}
throw new IllegalStateException("Should never get here");
}
/**
* Invoke the specified JDBC API {@link Method} against the supplied target
* object with no arguments.
* @param method the method to invoke
* @param target the target object to invoke the method on
* @return the invocation result, if any
* @throws SQLException the JDBC API SQLException to rethrow (if any)
* @see #invokeJdbcMethod(java.lang.reflect.Method, Object, Object[])
*/
public static Object invokeJdbcMethod(Method method, Object target) throws SQLException {
return invokeJdbcMethod(method, target, new Object[0]);
}
/**
* Invoke the specified JDBC API {@link Method} against the supplied target
* object with the supplied arguments.
* @param method the method to invoke
* @param target the target object to invoke the method on
* @param args the invocation arguments (may be {@code null})
* @return the invocation result, if any
* @throws SQLException the JDBC API SQLException to rethrow (if any)
* @see #invokeMethod(java.lang.reflect.Method, Object, Object[])
*/
public static Object invokeJdbcMethod(Method method, Object target, Object... args) throws SQLException {
try {
return method.invoke(target, args);
}
catch (IllegalAccessException ex) {
handleReflectionException(ex);
}
catch (InvocationTargetException ex) {
if (ex.getTargetException() instanceof SQLException) {
throw (SQLException) ex.getTargetException();
}
handleInvocationTargetException(ex);
}
throw new IllegalStateException("Should never get here");
}
/**
* Handle the given reflection exception. Should only be called if no
* checked exception is expected to be thrown by the target method.
*
Throws the underlying RuntimeException or Error in case of an
* InvocationTargetException with such a root cause. Throws an
* IllegalStateException with an appropriate message else.
* @param ex the reflection exception to handle
*/
public static void handleReflectionException(Exception ex) {
if (ex instanceof NoSuchMethodException) {
throw new IllegalStateException("Method not found: " + ex.getMessage());
}
if (ex instanceof IllegalAccessException) {
throw new IllegalStateException("Could not access method: " + ex.getMessage());
}
if (ex instanceof InvocationTargetException) {
handleInvocationTargetException((InvocationTargetException) ex);
}
if (ex instanceof RuntimeException) {
throw (RuntimeException) ex;
}
throw new UndeclaredThrowableException(ex);
}
/**
* Handle the given invocation target exception. Should only be called if no
* checked exception is expected to be thrown by the target method.
*
Throws the underlying RuntimeException or Error in case of such a root
* cause. Throws an IllegalStateException else.
* @param ex the invocation target exception to handle
*/
public static void handleInvocationTargetException(InvocationTargetException ex) {
rethrowRuntimeException(ex.getTargetException());
}
/**
* Rethrow the given {@link Throwable exception}, which is presumably the
* target exception of an {@link InvocationTargetException}.
* Should only be called if no checked exception is expected to be thrown
* by the target method.
*
Rethrows the underlying exception cast to an {@link RuntimeException} or
* {@link Error} if appropriate; otherwise, throws an {@link IllegalStateException}.
* @param ex the exception to rethrow
* @throws RuntimeException the rethrown exception
*/
public static void rethrowRuntimeException(Throwable ex) {
if (ex instanceof RuntimeException) {
throw (RuntimeException) ex;
}
if (ex instanceof Error) {
throw (Error) ex;
}
throw new UndeclaredThrowableException(ex);
}
/**
* Rethrow the given {@link Throwable exception}, which is presumably the
* target exception of an {@link InvocationTargetException}.
* Should only be called if no checked exception is expected to be thrown
* by the target method.
*
Rethrows the underlying exception cast to an {@link Exception} or
* {@link Error} if appropriate; otherwise, throws an {@link IllegalStateException}.
* @param ex the exception to rethrow
* @throws Exception the rethrown exception (in case of a checked exception)
*/
public static void rethrowException(Throwable ex) throws Exception {
if (ex instanceof Exception) {
throw (Exception) ex;
}
if (ex instanceof Error) {
throw (Error) ex;
}
throw new UndeclaredThrowableException(ex);
}
/**
* Determine whether the given method explicitly declares the given
* exception or one of its superclasses, which means that an exception
* of that type can be propagated as-is within a reflective invocation.
* @param method the declaring method
* @param exceptionType the exception to throw
* @return {@code true} if the exception can be thrown as-is;
* {@code false} if it needs to be wrapped
*/
public static boolean declaresException(Method method, Class exceptionType) {
Class[] declaredExceptions = method.getExceptionTypes();
for (Class declaredException : declaredExceptions) {
if (declaredException.isAssignableFrom(exceptionType)) {
return true;
}
}
return false;
}
/**
* Determine whether the given field is a "public static final" constant.
* @param field the field to check
*/
public static boolean isPublicStaticFinal(Field field) {
int modifiers = field.getModifiers();
return (Modifier.isPublic(modifiers) && Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers));
}
/**
* Determine whether the given method is an "equals" method.
* @see java.lang.Object#equals(Object)
*/
public static boolean isEqualsMethod(Method method) {
if (method == null || !method.getName().equals("equals")) {
return false;
}
Class[] paramTypes = method.getParameterTypes();
return (paramTypes.length == 1 && paramTypes[0] == Object.class);
}
/**
* Determine whether the given method is a "hashCode" method.
* @see java.lang.Object#hashCode()
*/
public static boolean isHashCodeMethod(Method method) {
return (method != null && method.getName().equals("hashCode") && method.getParameterTypes().length == 0);
}
/**
* Determine whether the given method is a "toString" method.
* @see java.lang.Object#toString()
*/
public static boolean isToStringMethod(Method method) {
return (method != null && method.getName().equals("toString") && method.getParameterTypes().length == 0);
}
/**
* Determine whether the given method is originally declared by {@link java.lang.Object}.
*/
public static boolean isObjectMethod(Method method) {
if (method == null) {
return false;
}
try {
Object.class.getDeclaredMethod(method.getName(), method.getParameterTypes());
return true;
}
catch (Exception ex) {
return false;
}
}
/**
* Determine whether the given method is a CGLIB 'renamed' method,
* following the pattern "CGLIB$methodName$0".
* @param renamedMethod the method to check
*/
public static boolean isCglibRenamedMethod(Method renamedMethod) {
String name = renamedMethod.getName();
if (name.startsWith(CGLIB_RENAMED_METHOD_PREFIX)) {
int i = name.length() - 1;
while (i >= 0 && Character.isDigit(name.charAt(i))) {
i--;
}
return ((i > CGLIB_RENAMED_METHOD_PREFIX.length()) &&
(i < name.length() - 1) && name.charAt(i) == '$');
}
return false;
}
/**
* Make the given field accessible, explicitly setting it accessible if
* necessary. The {@code setAccessible(true)} method is only called
* when actually necessary, to avoid unnecessary conflicts with a JVM
* SecurityManager (if active).
* @param field the field to make accessible
* @see java.lang.reflect.Field#setAccessible
*/
public static void makeAccessible(Field field) {
if ((!Modifier.isPublic(field.getModifiers()) ||
!Modifier.isPublic(field.getDeclaringClass().getModifiers()) ||
Modifier.isFinal(field.getModifiers())) && !field.isAccessible()) {
field.setAccessible(true);
}
}
/**
* Make the given method accessible, explicitly setting it accessible if
* necessary. The {@code setAccessible(true)} method is only called
* when actually necessary, to avoid unnecessary conflicts with a JVM
* SecurityManager (if active).
* @param method the method to make accessible
* @see java.lang.reflect.Method#setAccessible
*/
public static void makeAccessible(Method method) {
if ((!Modifier.isPublic(method.getModifiers()) ||
!Modifier.isPublic(method.getDeclaringClass().getModifiers())) && !method.isAccessible()) {
method.setAccessible(true);
}
}
/**
* Make the given constructor accessible, explicitly setting it accessible
* if necessary. The {@code setAccessible(true)} method is only called
* when actually necessary, to avoid unnecessary conflicts with a JVM
* SecurityManager (if active).
* @param ctor the constructor to make accessible
* @see java.lang.reflect.Constructor#setAccessible
*/
public static void makeAccessible(Constructor ctor) {
if ((!Modifier.isPublic(ctor.getModifiers()) ||
!Modifier.isPublic(ctor.getDeclaringClass().getModifiers())) && !ctor.isAccessible()) {
ctor.setAccessible(true);
}
}
/**
* Perform the given callback operation on all matching methods of the given
* class, as locally declared or equivalent thereof (such as default methods
* on Java 8 based interfaces that the given class implements).
* @param clazz the class to introspect
* @param mc the callback to invoke for each method
* @since 4.2
* @see #doWithMethods
*/
public static void doWithLocalMethods(Class clazz, MethodCallback mc) {
Method[] methods = getDeclaredMethods(clazz);
for (Method method : methods) {
try {
mc.doWith(method);
}
catch (IllegalAccessException ex) {
throw new IllegalStateException("Not allowed to access method '" + method.getName() + "': " + ex);
}
}
}
/**
* Perform the given callback operation on all matching methods of the given
* class and superclasses.
*
The same named method occurring on subclass and superclass will appear
* twice, unless excluded by a {@link MethodFilter}.
* @param clazz the class to introspect
* @param mc the callback to invoke for each method
* @see #doWithMethods(Class, MethodCallback, MethodFilter)
*/
public static void doWithMethods(Class clazz, MethodCallback mc) {
doWithMethods(clazz, mc, null);
}
/**
* Perform the given callback operation on all matching methods of the given
* class and superclasses (or given interface and super-interfaces).
*
The same named method occurring on subclass and superclass will appear
* twice, unless excluded by the specified {@link MethodFilter}.
* @param clazz the class to introspect
* @param mc the callback to invoke for each method
* @param mf the filter that determines the methods to apply the callback to
*/
public static void doWithMethods(Class clazz, MethodCallback mc, MethodFilter mf) {
// Keep backing up the inheritance hierarchy.
Method[] methods = getDeclaredMethods(clazz);
for (Method method : methods) {
if (mf != null && !mf.matches(method)) {
continue;
}
try {
mc.doWith(method);
}
catch (IllegalAccessException ex) {
throw new IllegalStateException("Not allowed to access method '" + method.getName() + "': " + ex);
}
}
if (clazz.getSuperclass() != null) {
doWithMethods(clazz.getSuperclass(), mc, mf);
}
else if (clazz.isInterface()) {
for (Class superIfc : clazz.getInterfaces()) {
doWithMethods(superIfc, mc, mf);
}
}
}
/**
* Get all declared methods on the leaf class and all superclasses.
* Leaf class methods are included first.
* @param leafClass the class to introspect
*/
public static Method[] getAllDeclaredMethods(Class leafClass) {
final List methods = new ArrayList(32);
doWithMethods(leafClass, new MethodCallback() {
@Override
public void doWith(Method method) {
methods.add(method);
}
});
return methods.toArray(new Method[methods.size()]);
}
/**
* Get the unique set of declared methods on the leaf class and all superclasses.
* Leaf class methods are included first and while traversing the superclass hierarchy
* any methods found with signatures matching a method already included are filtered out.
* @param leafClass the class to introspect
*/
public static Method[] getUniqueDeclaredMethods(Class leafClass) {
final List methods = new ArrayList(32);
doWithMethods(leafClass, new MethodCallback() {
@Override
public void doWith(Method method) {
boolean knownSignature = false;
Method methodBeingOverriddenWithCovariantReturnType = null;
for (Method existingMethod : methods) {
if (method.getName().equals(existingMethod.getName()) &&
Arrays.equals(method.getParameterTypes(), existingMethod.getParameterTypes())) {
// Is this a covariant return type situation?
if (existingMethod.getReturnType() != method.getReturnType() &&
existingMethod.getReturnType().isAssignableFrom(method.getReturnType())) {
methodBeingOverriddenWithCovariantReturnType = existingMethod;
}
else {
knownSignature = true;
}
break;
}
}
if (methodBeingOverriddenWithCovariantReturnType != null) {
methods.remove(methodBeingOverriddenWithCovariantReturnType);
}
if (!knownSignature && !isCglibRenamedMethod(method)) {
methods.add(method);
}
}
});
return methods.toArray(new Method[methods.size()]);
}
/**
* This variant retrieves {@link Class#getDeclaredMethods()} from a local cache
* in order to avoid the JVM's SecurityManager check and defensive array copying.
* In addition, it also includes Java 8 default methods from locally implemented
* interfaces, since those are effectively to be treated just like declared methods.
* @param clazz the class to introspect
* @return the cached array of methods
* @see Class#getDeclaredMethods()
*/
private static Method[] getDeclaredMethods(Class clazz) {
Method[] result = declaredMethodsCache.get(clazz);
if (result == null) {
Method[] declaredMethods = clazz.getDeclaredMethods();
List defaultMethods = findConcreteMethodsOnInterfaces(clazz);
if (defaultMethods != null) {
result = new Method[declaredMethods.length + defaultMethods.size()];
System.arraycopy(declaredMethods, 0, result, 0, declaredMethods.length);
int index = declaredMethods.length;
for (Method defaultMethod : defaultMethods) {
result[index] = defaultMethod;
index++;
}
}
else {
result = declaredMethods;
}
declaredMethodsCache.put(clazz, (result.length == 0 ? NO_METHODS : result));
}
return result;
}
private static List findConcreteMethodsOnInterfaces(Class clazz) {
List result = null;
for (Class ifc : clazz.getInterfaces()) {
for (Method ifcMethod : ifc.getMethods()) {
if (!Modifier.isAbstract(ifcMethod.getModifiers())) {
if (result == null) {
result = new LinkedList();
}
result.add(ifcMethod);
}
}
}
return result;
}
/**
* Invoke the given callback on all fields in the target class, going up the
* class hierarchy to get all declared fields.
* @param clazz the target class to analyze
* @param fc the callback to invoke for each field
* @since 4.2
* @see #doWithFields
*/
public static void doWithLocalFields(Class clazz, FieldCallback fc) {
for (Field field : getDeclaredFields(clazz)) {
try {
fc.doWith(field);
}
catch (IllegalAccessException ex) {
throw new IllegalStateException("Not allowed to access field '" + field.getName() + "': " + ex);
}
}
}
/**
* Invoke the given callback on all fields in the target class, going up the
* class hierarchy to get all declared fields.
* @param clazz the target class to analyze
* @param fc the callback to invoke for each field
*/
public static void doWithFields(Class clazz, FieldCallback fc) {
doWithFields(clazz, fc, null);
}
/**
* Invoke the given callback on all fields in the target class, going up the
* class hierarchy to get all declared fields.
* @param clazz the target class to analyze
* @param fc the callback to invoke for each field
* @param ff the filter that determines the fields to apply the callback to
*/
public static void doWithFields(Class clazz, FieldCallback fc, FieldFilter ff) {
// Keep backing up the inheritance hierarchy.
Class targetClass = clazz;
do {
Field[] fields = getDeclaredFields(targetClass);
for (Field field : fields) {
if (ff != null && !ff.matches(field)) {
continue;
}
try {
fc.doWith(field);
}
catch (IllegalAccessException ex) {
throw new IllegalStateException("Not allowed to access field '" + field.getName() + "': " + ex);
}
}
targetClass = targetClass.getSuperclass();
}
while (targetClass != null && targetClass != Object.class);
}
/**
* This variant retrieves {@link Class#getDeclaredFields()} from a local cache
* in order to avoid the JVM's SecurityManager check and defensive array copying.
* @param clazz the class to introspect
* @return the cached array of fields
* @see Class#getDeclaredFields()
*/
private static Field[] getDeclaredFields(Class clazz) {
Field[] result = declaredFieldsCache.get(clazz);
if (result == null) {
result = clazz.getDeclaredFields();
declaredFieldsCache.put(clazz, (result.length == 0 ? NO_FIELDS : result));
}
return result;
}
/**
* Given the source object and the destination, which must be the same class
* or a subclass, copy all fields, including inherited fields. Designed to
* work on objects with public no-arg constructors.
*/
public static void shallowCopyFieldState(final Object src, final Object dest) {
if (src == null) {
throw new IllegalArgumentException("Source for field copy cannot be null");
}
if (dest == null) {
throw new IllegalArgumentException("Destination for field copy cannot be null");
}
if (!src.getClass().isAssignableFrom(dest.getClass())) {
throw new IllegalArgumentException("Destination class [" + dest.getClass().getName() +
"] must be same or subclass as source class [" + src.getClass().getName() + "]");
}
doWithFields(src.getClass(), new FieldCallback() {
@Override
public void doWith(Field field) throws IllegalArgumentException, IllegalAccessException {
makeAccessible(field);
Object srcValue = field.get(src);
field.set(dest, srcValue);
}
}, COPYABLE_FIELDS);
}
/**
* Clear the internal method/field cache.
* @since 4.2.4
*/
public static void clearCache() {
declaredMethodsCache.clear();
declaredFieldsCache.clear();
}
/**
* Action to take on each method.
*/
public interface MethodCallback {
/**
* Perform an operation using the given method.
* @param method the method to operate on
*/
void doWith(Method method) throws IllegalArgumentException, IllegalAccessException;
}
/**
* Callback optionally used to filter methods to be operated on by a method callback.
*/
public interface MethodFilter {
/**
* Determine whether the given method matches.
* @param method the method to check
*/
boolean matches(Method method);
}
/**
* Callback interface invoked on each field in the hierarchy.
*/
public interface FieldCallback {
/**
* Perform an operation using the given field.
* @param field the field to operate on
*/
void doWith(Field field) throws IllegalArgumentException, IllegalAccessException;
}
/**
* Callback optionally used to filter fields to be operated on by a field callback.
*/
public interface FieldFilter {
/**
* Determine whether the given field matches.
* @param field the field to check
*/
boolean matches(Field field);
}
/**
* Pre-built FieldFilter that matches all non-static, non-final fields.
*/
public static FieldFilter COPYABLE_FIELDS = new FieldFilter() {
@Override
public boolean matches(Field field) {
return !(Modifier.isStatic(field.getModifiers()) || Modifier.isFinal(field.getModifiers()));
}
};
/**
* Pre-built MethodFilter that matches all non-bridge methods.
*/
public static MethodFilter NON_BRIDGED_METHODS = new MethodFilter() {
@Override
public boolean matches(Method method) {
return !method.isBridge();
}
};
/**
* Pre-built MethodFilter that matches all non-bridge methods
* which are not declared on {@code java.lang.Object}.
*/
public static MethodFilter USER_DECLARED_METHODS = new MethodFilter() {
@Override
public boolean matches(Method method) {
return (!method.isBridge() && method.getDeclaringClass() != Object.class);
}
};
public static void main(String[] args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
Object o=invokeMethod("com.datastax.util.lang.StringUtil","substringIndent","20g16","0","6");
System.out.println(o);
}
/**
* 将一个对象转换为对应的类
*
* @param value
* @param c
* @return
*/
public static Object conversion(String value, Class c) {
if (String.class.equals(c)) {
return value;
} else if (Integer.class.equals(c)) {
return Integer.parseInt(value);
} else if (Double.class.equals(c)) {
return Double.parseDouble(value);
} else if (Float.class.equals(c)) {
return Float.parseFloat(value);
} else if (Long.class.equals(c)) {
return Long.parseLong(value);
} else {
return value;
}
}
public static Object evaluateExpression(String expression,Map instanceMap) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
Object object=null;
String methodFullName=null;
String className=null;
if(expression.contains(".") && expression.contains("(")){
methodFullName=expression.substring(0,expression.indexOf("("));
if(methodFullName.contains(".")) {
className = methodFullName.substring(0, methodFullName.lastIndexOf("."));
}
}
//表达式为方法
if(className!=null && instanceMap.containsKey(className)){
String methodName=methodFullName.substring(methodFullName.lastIndexOf(".")+1);
String argText=StringUtil.substringFirstAndLast(expression,"(",")");
Object instance=instanceMap.get(className);
Class clazz=instance.getClass();
//不带参数的方法
if(argText==null){
Method method=clazz.getMethod(methodName,new Class[0]);
object=method.invoke(instance,new Object[0]);
}else {//带参数的方法
String[] arguments=argText.split(",");
Object[] args=new Object[arguments.length];
List methodList=getMethods(clazz,methodName,args.length);
for(Method method : methodList){
Class[] paramTypes=method.getParameterTypes();
for(int i=0;i getMethods(Class clazz,String methodName,int paramNum) throws NoSuchMethodException {
List methodList=new ArrayList<>();
Method[] methods=clazz.getMethods();
for(Method method : methods){
if(method.getName().equals(methodName)){
int paramCount=method.getParameterTypes().length;
if(paramCount==paramNum){
methodList.add(method);
}
}
}
return methodList;
}
public static List getObjectMethods(){
List methodList=new ArrayList<>();
Method[] methods=Object.class.getMethods();
for(Method method : methods){
methodList.add(method.getName());
}
return methodList;
}
}