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/*
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.internal.loader;
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import jdk.internal.module.Checks;
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/**
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* Helper class for Class#getResource, Module#getResourceAsStream, and other
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* methods that locate a resource in a module.
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*/
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public final class ResourceHelper {
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private ResourceHelper() { }
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/**
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* Returns the <em>package name</em> for a resource.
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*/
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public static String getPackageName(String name) {
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int index = name.lastIndexOf('/');
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if (index != -1) {
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return name.substring(0, index).replace("/", ".");
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} else {
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return "";
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}
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}
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/**
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* Returns true if the resource is a <em>simple resource</em> that can
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* never be encapsulated. Resources ending in "{@code .class}" or where
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* the package name is not a Java identifier are resources that can
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* never be encapsulated.
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*/
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public static boolean isSimpleResource(String name) {
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int len = name.length();
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if (len > 6 && name.endsWith(".class")) {
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return true;
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}
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if (!Checks.isJavaIdentifier(getPackageName(name))) {
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return true;
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}
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return false;
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}
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}
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