com.sun.beans.finder.ClassFinder Maven / Gradle / Ivy
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/*
* Copyright (c) 2006, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.beans.finder;
import static sun.reflect.misc.ReflectUtil.checkPackageAccess;
/**
* This is utility class that provides {@code static} methods
* to find a class with the specified name using the specified class loader.
*
* @since 1.7
*
* @author Sergey A. Malenkov
*/
public final class ClassFinder {
/**
* Returns the {@code Class} object associated
* with the class or interface with the given string name,
* using the default class loader.
*
* The {@code name} can denote an array class
* (see {@link Class#getName} for details).
*
* @param name fully qualified name of the desired class
* @return class object representing the desired class
*
* @throws ClassNotFoundException if the class cannot be located
* by the specified class loader
*
* @see Class#forName(String)
* @see Class#forName(String,boolean,ClassLoader)
* @see ClassLoader#getSystemClassLoader()
* @see Thread#getContextClassLoader()
*/
public static Class findClass(String name) throws ClassNotFoundException {
checkPackageAccess(name);
try {
ClassLoader loader = Thread.currentThread().getContextClassLoader();
if (loader == null) {
// can be null in IE (see 6204697)
loader = ClassLoader.getSystemClassLoader();
}
if (loader != null) {
return Class.forName(name, false, loader);
}
} catch (ClassNotFoundException exception) {
// use current class loader instead
} catch (SecurityException exception) {
// use current class loader instead
}
return Class.forName(name);
}
/**
* Returns the {@code Class} object associated with
* the class or interface with the given string name,
* using the given class loader.
*
* The {@code name} can denote an array class
* (see {@link Class#getName} for details).
*
* If the parameter {@code loader} is null,
* the class is loaded through the default class loader.
*
* @param name fully qualified name of the desired class
* @param loader class loader from which the class must be loaded
* @return class object representing the desired class
*
* @throws ClassNotFoundException if the class cannot be located
* by the specified class loader
*
* @see #findClass(String,ClassLoader)
* @see Class#forName(String,boolean,ClassLoader)
*/
public static Class findClass(String name, ClassLoader loader) throws ClassNotFoundException {
checkPackageAccess(name);
if (loader != null) {
try {
return Class.forName(name, false, loader);
} catch (ClassNotFoundException exception) {
// use default class loader instead
} catch (SecurityException exception) {
// use default class loader instead
}
}
return findClass(name);
}
/**
* Returns the {@code Class} object associated
* with the class or interface with the given string name,
* using the default class loader.
*
* The {@code name} can denote an array class
* (see {@link Class#getName} for details).
*
* This method can be used to obtain
* any of the {@code Class} objects
* representing {@code void} or primitive Java types:
* {@code char}, {@code byte}, {@code short},
* {@code int}, {@code long}, {@code float},
* {@code double} and {@code boolean}.
*
* @param name fully qualified name of the desired class
* @return class object representing the desired class
*
* @throws ClassNotFoundException if the class cannot be located
* by the specified class loader
*
* @see #resolveClass(String,ClassLoader)
*/
public static Class resolveClass(String name) throws ClassNotFoundException {
return resolveClass(name, null);
}
/**
* Returns the {@code Class} object associated with
* the class or interface with the given string name,
* using the given class loader.
*
* The {@code name} can denote an array class
* (see {@link Class#getName} for details).
*
* If the parameter {@code loader} is null,
* the class is loaded through the default class loader.
*
* This method can be used to obtain
* any of the {@code Class} objects
* representing {@code void} or primitive Java types:
* {@code char}, {@code byte}, {@code short},
* {@code int}, {@code long}, {@code float},
* {@code double} and {@code boolean}.
*
* @param name fully qualified name of the desired class
* @param loader class loader from which the class must be loaded
* @return class object representing the desired class
*
* @throws ClassNotFoundException if the class cannot be located
* by the specified class loader
*
* @see #findClass(String,ClassLoader)
* @see PrimitiveTypeMap#getType(String)
*/
public static Class resolveClass(String name, ClassLoader loader) throws ClassNotFoundException {
Class type = PrimitiveTypeMap.getType(name);
return (type == null)
? findClass(name, loader)
: type;
}
/**
* Disable instantiation.
*/
private ClassFinder() {
}
}