package com.firefly.utils;
import com.firefly.utils.classproxy.JavassistReflectionProxyFactory;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
public abstract class ReflectUtils {
private static final ConcurrentHashMap<Class<?>, Map<String, Method>> getterCache = new ConcurrentHashMap<>(256);
private static final ConcurrentHashMap<Class<?>, Map<String, Method>> setterCache = new ConcurrentHashMap<>(256);
private static final ConcurrentHashMap<Class<?>, Map<String, Field>> propertyCache = new ConcurrentHashMap<>(256);
public static ProxyFactory defaultProxyFactory = JavassistReflectionProxyFactory.INSTANCE;
public interface BeanMethodFilter {
boolean accept(String propertyName, Method method);
}
public interface BeanFieldFilter {
boolean accept(String propertyName, Field field);
}
public interface MethodProxy {
Method method();
/**
* Executes this method
*
* @param obj The instance of object that contains this method
* @param args The parameters of this method
* @return Return value of this method
*/
Object invoke(Object obj, Object... args);
}
public interface FieldProxy {
Field field();
Object get(Object obj);
void set(Object obj, Object value);
}
public interface ArrayProxy {
int size(Object array);
Object get(Object array, int index);
void set(Object array, int index, Object value);
}
public interface ProxyFactory {
ArrayProxy getArrayProxy(Class<?> clazz);
FieldProxy getFieldProxy(Field field);
MethodProxy getMethodProxy(Method method);
}
public static void setProperty(Object obj, String property, Object value) throws Throwable {
getFields(obj.getClass()).get(property).set(obj, value);
}
public static Object getProperty(Object obj, String property) throws Throwable {
return getFields(obj.getClass()).get(property).get(obj);
}
/**
* Invokes a object's "setter" method by property name
*
* @param obj The instance of a object
* @param property The property name of this object
* @param value The parameter of "setter" method that you want to set
* @throws Throwable A runtime exception
*/
public static void set(Object obj, String property, Object value) throws Throwable {
getSetterMethod(obj.getClass(), property).invoke(obj, value);
}
/**
* Invokes a object's "getter" method by property name
*
* @param obj The instance of a object
* @param property The property name of this object
* @return The value of this property
* @throws Throwable A runtime exception
*/
public static Object get(Object obj, String property) throws Throwable {
return getGetterMethod(obj.getClass(), property).invoke(obj);
}
public static Object arrayGet(Object array, int index) {
return getArrayProxy(array.getClass()).get(array, index);
}
public static void arraySet(Object array, int index, Object value) {
getArrayProxy(array.getClass()).set(array, index, value);
}
public static int arraySize(Object array) {
return getArrayProxy(array.getClass()).size(array);
}
public static ArrayProxy getArrayProxy(Class<?> clazz) {
return defaultProxyFactory.getArrayProxy(clazz);
}
public static FieldProxy getFieldProxy(Field field) {
return defaultProxyFactory.getFieldProxy(field);
}
public static MethodProxy getMethodProxy(Method method) {
return defaultProxyFactory.getMethodProxy(method);
}
/**
* Gets the all interface names of this class
*
* @param c The class of one object
* @return Returns the all interface names
*/
public static String[] getInterfaceNames(Class<?> c) {
Class<?>[] interfaces = c.getInterfaces();
List<String> names = new ArrayList<>();
for (Class<?> i : interfaces) {
names.add(i.getName());
}
return names.toArray(new String[0]);
}
public static String getPropertyName(Method method) {
String methodName = method.getName();
int index = (methodName.charAt(0) == 'i' ? 2 : 3);
char c = methodName.charAt(index);
if (Character.isLowerCase(c)) {
return methodName.substring(index);
} else {
return Character.toLowerCase(methodName.charAt(index)) + methodName.substring(index + 1);
}
}
public static Method getSetterMethod(Class<?> clazz, String propertyName) {
return getSetterMethods(clazz).get(propertyName);
}
public static Map<String, Method> getSetterMethods(Class<?> clazz) {
return setterCache.computeIfAbsent(clazz, key -> getSetterMethods(key, null));
}
public static Map<String, Method> getSetterMethods(Class<?> clazz, BeanMethodFilter filter) {
Map<String, Method> setMethodMap = new HashMap<>();
Method[] methods = clazz.getMethods();
for (Method method : methods) {
method.setAccessible(true);
if (method.getName().length() < 4
|| !method.getName().startsWith("set")
|| Modifier.isStatic(method.getModifiers())
|| !method.getReturnType().equals(Void.TYPE)
|| method.getParameterTypes().length != 1)
continue;
String propertyName = getPropertyName(method);
if (filter == null || filter.accept(propertyName, method))
setMethodMap.put(propertyName, method);
}
return setMethodMap;
}
public static Method getGetterMethod(Class<?> clazz, String propertyName) {
return getGetterMethods(clazz).get(propertyName);
}
public static Map<String, Method> getGetterMethods(Class<?> clazz) {
return getterCache.computeIfAbsent(clazz, key -> getGetterMethods(key, null));
}
public static Map<String, Method> getGetterMethods(Class<?> clazz, BeanMethodFilter filter) {
Map<String, Method> getMethodMap = new HashMap<>();
Method[] methods = clazz.getMethods();
for (int i = 0; i < methods.length; i++) {
Method method = methods[i];
method.setAccessible(true);
String methodName = method.getName();
if (Modifier.isStatic(method.getModifiers()))
continue;
if (Modifier.isAbstract(method.getModifiers()))
continue;
if (method.getName().equals("getClass"))
continue;
if (!(method.getName().startsWith("is") || method.getName().startsWith("get")))
continue;
if (method.getParameterTypes().length != 0)
continue;
if (method.getReturnType() == void.class)
continue;
int index = (methodName.charAt(0) == 'i' ? 2 : 3);
if (methodName.length() < index + 1)
continue;
String propertyName = getPropertyName(method);
if (filter == null || filter.accept(propertyName, method))
getMethodMap.put(propertyName, method);
}
return getMethodMap;
}
public static Map<String, Field> getFields(Class<?> clazz) {
return propertyCache.computeIfAbsent(clazz, key -> getFields(key, null));
}
public static Map<String, Field> getFields(Class<?> clazz, BeanFieldFilter filter) {
Map<String, Field> fieldMap = new HashMap<>();
Field[] fields = clazz.getFields();
for (Field field : fields) {
field.setAccessible(true);
if (Modifier.isStatic(field.getModifiers()))
continue;
String propertyName = field.getName();
if (filter == null || filter.accept(propertyName, field))
fieldMap.put(propertyName, field);
}
return fieldMap;
}
public static void copy(Object src, Object dest) {
Map<String, Method> getterMethodMap = ReflectUtils.getGetterMethods(src.getClass());
Map<String, Method> setterMethodMap = ReflectUtils.getSetterMethods(dest.getClass());
for (Map.Entry<String, Method> entry : setterMethodMap.entrySet()) {
Method getter = getterMethodMap.get(entry.getKey());
if (getter == null)
continue;
try {
Object obj = getter.invoke(src);
if (obj != null) {
entry.getValue().invoke(dest, obj);
}
} catch (Throwable t) {
System.err.println("copy object exception, " + t.getMessage());
}
}
}
}