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- /*
- * Sonar Standalone Runner
- * Copyright (C) 2011 SonarSource
- * dev@sonar.codehaus.org
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 3 of the License, or (at your option) any later version.
- *
- * This program 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02
- */
- package org.sonar.runner.bootstrapper;
-
- import java.io.IOException;
- import java.net.URL;
- import java.net.URLClassLoader;
- import java.util.Enumeration;
-
- /**
- * Special {@link URLClassLoader} to execute Sonar, which restricts loading from parent.
- */
- public class BootstrapClassLoader extends URLClassLoader {
-
- private final String[] unmaskedPackages;
-
- public BootstrapClassLoader(ClassLoader parent, String... unmaskedPackages) {
- super(new URL[0], parent);
- this.unmaskedPackages = unmaskedPackages;
- }
-
- /**
- * {@inheritDoc} Visibility of a method has been relaxed to public.
- */
- @Override
- public void addURL(URL url) {
- super.addURL(url);
- }
-
- /**
- * {@inheritDoc} Visibility of a method has been relaxed to public.
- */
- @Override
- public Class<?> findClass(String name) throws ClassNotFoundException {
- return super.findClass(name);
- }
-
- /**
- * @return true, if class can be loaded from parent ClassLoader
- */
- boolean canLoadFromParent(String name) {
- for (String pkg : unmaskedPackages) {
- if (name.startsWith(pkg + ".")) {
- return true;
- }
- }
- return false;
- }
-
- /**
- * Same behavior as in {@link URLClassLoader#loadClass(String, boolean)}, except loading from parent.
- */
- @Override
- protected synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
- // First, check if the class has already been loaded
- Class<?> c = findLoadedClass(name);
- if (c == null) {
- try {
- // Load from parent
- if (getParent() != null && canLoadFromParent(name)) {
- c = getParent().loadClass(name);
- } else {
- // Load from system
-
- // I don't know for other vendors, but for Oracle JVM :
- // - ClassLoader.getSystemClassLoader() is sun.misc.Launcher$AppClassLoader. It contains app classpath.
- // - ClassLoader.getSystemClassLoader().getParent() is sun.misc.Launcher$ExtClassLoader. It contains core JVM
- ClassLoader systemClassLoader = getSystemClassLoader();
- if (systemClassLoader.getParent() != null) {
- systemClassLoader = systemClassLoader.getParent();
- }
- c = systemClassLoader.loadClass(name);
- }
- } catch (ClassNotFoundException e) {
- // If still not found, then invoke findClass in order
- // to find the class.
- c = findClass(name);
- }
- }
- if (resolve) {
- resolveClass(c);
- }
- return c;
- }
-
- /**
- * Unlike {@link URLClassLoader#getResource(String)} don't return resource from parent.
- * See http://jira.codehaus.org/browse/SONAR-2276
- */
- @Override
- public URL getResource(String name) {
- return findResource(name);
- }
-
- /**
- * Unlike {@link URLClassLoader#getResources(String)} don't return resources from parent.
- * See http://jira.codehaus.org/browse/SONAR-2276
- */
- @Override
- public Enumeration<URL> getResources(String name) throws IOException {
- return findResources(name);
- }
-
- }
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