com.fireflysource.common.reflection.ReflectionUtils Maven / Gradle / Ivy
The newest version!
package com.fireflysource.common.reflection;
import com.fireflysource.common.bytecode.*;
import com.fireflysource.common.service.ServiceUtils;
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;
/**
* @author Pengtao Qiu
*/
public class ReflectionUtils {
public static final ProxyFactory DEFAULT_PROXY_FACTORY = ServiceUtils.loadService(ProxyFactory.class, JavassistReflectionProxyFactory.INSTANCE);
private static final Map, Map> getterCache = new ConcurrentHashMap<>();
private static final Map, Map> setterCache = new ConcurrentHashMap<>();
private static final Map, Map> propertyCache = new ConcurrentHashMap<>();
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 an object's "setter" method by property name
*
* @param obj The instance of an 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 an object's "getter" method by property name
*
* @param obj The instance of an 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 DEFAULT_PROXY_FACTORY.getArrayProxy(clazz);
}
public static FieldProxy getFieldProxy(Field field) {
return DEFAULT_PROXY_FACTORY.getFieldProxy(field);
}
public static MethodProxy getMethodProxy(Method method) {
return DEFAULT_PROXY_FACTORY.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 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 getSetterMethods(Class clazz) {
return setterCache.computeIfAbsent(clazz, key -> getSetterMethods(key, null));
}
public static Map getSetterMethods(Class clazz, BeanMethodFilter filter) {
Map setMethodMap = new HashMap<>();
Method[] methods = clazz.getMethods();
for (Method method : methods) {
method.setAccessible(true);
if (Modifier.isStatic(method.getModifiers())) continue;
if (Modifier.isAbstract(method.getModifiers())) continue;
if (method.getName().length() < 4) continue;
if (!method.getName().startsWith("set")) continue;
if (!method.getReturnType().equals(Void.TYPE)) continue;
if (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 getGetterMethods(Class clazz) {
return getterCache.computeIfAbsent(clazz, key -> getGetterMethods(key, null));
}
public static Map getGetterMethods(Class clazz, BeanMethodFilter filter) {
Map getMethodMap = new HashMap<>();
Method[] methods = clazz.getMethods();
for (Method method : methods) {
method.setAccessible(true);
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;
String methodName = method.getName();
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 getFields(Class clazz) {
return propertyCache.computeIfAbsent(clazz, key -> getFields(key, null));
}
public static Map getFields(Class clazz, BeanFieldFilter filter) {
Map 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 getterMethodMap = getGetterMethods(src.getClass());
Map setterMethodMap = getSetterMethods(dest.getClass());
for (Map.Entry 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());
}
}
}
@FunctionalInterface
public interface BeanMethodFilter {
boolean accept(String propertyName, Method method);
}
@FunctionalInterface
public interface BeanFieldFilter {
boolean accept(String propertyName, Field field);
}
}