com.kg.component.generator.util.ClassUtils Maven / Gradle / Ivy
/*
* Copyright (c) 2011-2021, baomidou ([email protected]).
*
* 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
*
* https://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.kg.component.generator.util;
import com.baomidou.mybatisplus.core.toolkit.ExceptionUtils;
import com.baomidou.mybatisplus.core.toolkit.StringPool;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
/**
* @author nieqiurong 2020/11/9.
* @since 3.5.0
*/
public final class ClassUtils {
private ClassUtils() {
}
/**
* 获取类名
*
* @param className className 全类名
* @return ignore
*/
public static String getSimpleName(String className) {
return StringUtils.isBlank(className) ? null : className.substring(className.lastIndexOf(StringPool.DOT) + 1);
}
/**
*
* 请仅在确定类存在的情况下调用该方法
*
*
* @param name 类名称
* @return 返回转换后的 Class
*/
public static Class toClassConfident(String name) {
try {
return Class.forName(name, false, getDefaultClassLoader());
} catch (ClassNotFoundException e) {
try {
return Class.forName(name);
} catch (ClassNotFoundException ex) {
throw ExceptionUtils.mpe("找不到指定的class！请仅在明确确定会有 class 的时候，调用该方法", e);
}
}
}
/**
* Return the default ClassLoader to use: typically the thread context
* ClassLoader, if available; the ClassLoader that loaded the ClassUtils
* class will be used as fallback.
* Call this method if you intend to use the thread context ClassLoader
* in a scenario where you clearly prefer a non-null ClassLoader reference:
* for example, for class path resource loading (but not necessarily for
* {@code Class.forName}, which accepts a {@code null} ClassLoader
* reference as well).
*
* @return the default ClassLoader (only {@code null} if even the system
* ClassLoader isn't accessible)
* @see Thread#getContextClassLoader()
* @see ClassLoader#getSystemClassLoader()
* @since 3.3.2
*/
public static ClassLoader getDefaultClassLoader() {
ClassLoader cl = null;
try {
cl = Thread.currentThread().getContextClassLoader();
} catch (Throwable ex) {
// Cannot access thread context ClassLoader - falling back...
}
if (cl == null) {
// No thread context class loader -> use class loader of this class.
cl = ClassUtils.class.getClassLoader();
if (cl == null) {
// getClassLoader() returning null indicates the bootstrap ClassLoader
try {
cl = ClassLoader.getSystemClassLoader();
} catch (Throwable ex) {
// Cannot access system ClassLoader - oh well, maybe the caller can live with null...
}
}
}
return cl;
}
}