com.wl4g.component.common.reflect.ObjectInstantiators Maven / Gradle / Ivy
/*
* Copyright 2017 ~ 2025 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.wl4g.component.common.reflect;
import static java.lang.Thread.currentThread;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Objects;
/**
* {@link ObjectInstantiators}
*
* @author Wangl.sir
* @version v1.0 2020-08-24
* @since
*/
public abstract class ObjectInstantiators {
/**
* New create instance by object class.
*
* @param objectClass
* @return
*/
@SuppressWarnings("unchecked")
public static T newInstance(Class objectClass) {
try {
if (!Objects.isNull(objenesis)) {
return (T) objenesisStdNewInstanceMethod.invoke(objenesis, new Object[] { objectClass });
}
return (T) objectClass.newInstance();
} catch (Exception ex) {
throw new Error("Unexpected reflection exception - " + ex.getClass().getName() + ": " + ex.getMessage());
}
}
// Spring packaging compatible object creator.
final private static String OBJENSIS_CLASS = "org.springframework.objenesis.ObjenesisStd";
final private static Object objenesis;
final private static Method objenesisStdNewInstanceMethod;
static {
Object _objenesis = null;
Method _objenesisStdNewInstanceMethod = null;
try {
Class objenesisClass = Class.forName(OBJENSIS_CLASS, false, currentThread().getContextClassLoader());
if (!Objects.isNull(objenesisClass)) {
_objenesisStdNewInstanceMethod = objenesisClass.getMethod("newInstance", Class.class);
// Objenesis object.
for (Constructor c : objenesisClass.getConstructors()) {
Class[] paramClasses = c.getParameterTypes();
if (paramClasses != null && paramClasses.length == 1 && boolean.class.isAssignableFrom(paramClasses[0])) {
_objenesis = c.newInstance(new Object[] { true });
break;
}
}
}
} catch (ClassNotFoundException e) { // Ignore
} catch (InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException
| NoSuchMethodException | SecurityException e) {
throw new IllegalStateException(e);
}
objenesis = _objenesis;
objenesisStdNewInstanceMethod = _objenesisStdNewInstanceMethod;
}
}