106 lines
3.8 KiB
Java
106 lines
3.8 KiB
Java
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/* GENERATED SOURCE. DO NOT MODIFY. */
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// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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*******************************************************************************
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* Copyright (C) 2015, International Business Machines Corporation and
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* others. All Rights Reserved.
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*******************************************************************************
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*/
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package android.icu.impl;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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/**
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* This utility class is used for resolving a right ClassLoader from
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* a given class. getClassLoader always returns a non-null ClassLoader
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* even a class is loaded through the bootstrap class loader of JRE.
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* @hide Only a subset of ICU is exposed in Android
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*/
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public class ClassLoaderUtil {
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private static class BootstrapClassLoader extends ClassLoader {
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BootstrapClassLoader() {
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// Object.class.getClassLoader() may return null.
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//
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// On Android, the behavior of super(null) is not guaranteed,
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// but Object.class.getClassLoader() actually returns the
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// bootstrap class loader. Note that we probably do not reach
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// this constructor on Android, because ClassLoaderUtil.getClassLoader()
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// should get non-null ClassLoader before calling
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// ClassLoaderUtil.getBootstrapClassLoader().
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//
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// On other common JREs (such as Oracle, OpenJDK),
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// Object.class.getClassLoader() returns null, but
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// super(null) is commonly used for accessing the bootstrap
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// class loader.
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super(Object.class.getClassLoader());
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}
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}
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private static volatile ClassLoader BOOTSTRAP_CLASSLOADER;
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/**
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* Lazily create a singleton BootstrapClassLoader.
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* This class loader might be necessary when ICU4J classes are
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* initialized by bootstrap class loader.
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*
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* @return The BootStrapClassLoader singleton instance
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*/
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private static ClassLoader getBootstrapClassLoader() {
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if (BOOTSTRAP_CLASSLOADER == null) {
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synchronized(ClassLoaderUtil.class) {
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if (BOOTSTRAP_CLASSLOADER == null) {
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ClassLoader cl = null;
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if (System.getSecurityManager() != null) {
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cl = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
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@Override
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public BootstrapClassLoader run() {
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return new BootstrapClassLoader();
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}
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});
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} else {
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cl = new BootstrapClassLoader();
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}
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BOOTSTRAP_CLASSLOADER = cl;
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}
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}
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}
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return BOOTSTRAP_CLASSLOADER;
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}
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/**
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* Returns the class loader used for loading the specified class.
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* @param cls The class
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* @return the class loader
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*/
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public static ClassLoader getClassLoader(Class<?> cls) {
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ClassLoader cl = cls.getClassLoader();
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if (cl == null) {
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cl = getClassLoader();
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}
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return cl;
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}
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/**
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* Returns a fallback class loader.
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* @return A class loader
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*/
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public static ClassLoader getClassLoader() {
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ClassLoader cl = Thread.currentThread().getContextClassLoader();
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if (cl == null) {
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cl = ClassLoader.getSystemClassLoader();
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if (cl == null) {
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// When this method is called for initializing a ICU4J class
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// during bootstrap, cl might be still null (other than Android?).
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// In this case, we want to use the bootstrap class loader.
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cl = getBootstrapClassLoader();
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}
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}
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return cl;
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}
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}
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