org.springframework.objenesis.instantiator.util.ClassUtils Maven / Gradle / Ivy
/*
* Copyright 2006-2021 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 org.springframework.objenesis.instantiator.util;
import org.springframework.objenesis.ObjenesisException;
/**
* Helper class for to play with classes.
*
* @author Henri Tremblay
*/
public final class ClassUtils {
private ClassUtils() { }
/**
* Will convert a class name to its name in the class definition format (e.g {@code org.springframework.objenesis.EmptyClass}
* becomes {@code org.springframework.objenesis/EmptyClass})
*
* @param className full class name including the package
* @return the internal name
*/
public static String classNameToInternalClassName(String className) {
return className.replace('.', '/');
}
/**
* Will convert a class name to its class loader resource name (e.g {@code org.springframework.objenesis.EmptyClass}
* becomes {@code org.springframework.objenesis/EmptyClass.class})
*
* @param className full class name including the package
* @return the resource name
*/
public static String classNameToResource(String className) {
return classNameToInternalClassName(className) + ".class";
}
/**
* Check if this class already exists in the class loader and return it if it does
*
* @param type of the class returned
* @param classLoader Class loader where to search the class
* @param className Class name with full path
* @return the class if it already exists or null
*/
@SuppressWarnings("unchecked")
public static Class getExistingClass(ClassLoader classLoader, String className) {
try {
return (Class) Class.forName(className, true, classLoader);
}
catch (ClassNotFoundException e) {
return null;
}
}
@SuppressWarnings("deprecation")
public static T newInstance(Class clazz) {
try {
return clazz.newInstance();
} catch (InstantiationException | IllegalAccessException e) {
throw new ObjenesisException(e);
}
}
}