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/*
* Copyright (c) 2015, 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.
*
* 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.
*/
/*
* @test
* @summary Test Package object is local to each ClassLoader.
* There can be one Package object of "foo" name defined by
* different class loader.
* @compile Foo.java
* @run testng GetPackages
*/
import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Arrays;
import java.lang.reflect.*;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import static org.testng.Assert.*;
public class GetPackages {
final TestClassLoader loader;
final Class<?> fooClass;
/*
* Each TestClassLoader defines a "foo.Foo" class which has a unique
* Package object of "foo" regardless whether its ancestor class loader
* defines a package "foo" or not.
*/
GetPackages(TestClassLoader loader) throws ClassNotFoundException {
this.loader = loader;
this.fooClass = loader.loadClass("foo.Foo");
}
/*
* Check package "foo" defined locally in the TestClassLoader
* as well as its ancestors.
*/
void checkPackage() throws ClassNotFoundException {
// Name of an unnamed package is empty string
assertEquals(this.getClass().getPackage().getName(), "");
assertEquals(fooClass.getClassLoader(), loader);
Package p = loader.getDefinedPackage("foo");
assertEquals(p.getName(), "foo");
assertEquals(p, loader.getPackage("foo"));
if (loader.getParent() != null) {
Package p2 = ((TestClassLoader)loader.getParent()).getDefinedPackage("foo");
assertTrue(p != p2);
}
long count = Arrays.stream(loader.getDefinedPackages())
.map(Package::getName)
.filter(pn -> pn.equals("foo"))
.count();
assertEquals(count, 1);
}
/*
* Check the number of package "foo" defined to this class loader and
* its ancestors
*/
Package[] getPackagesFromLoader() {
return loader.packagesInClassLoaderChain();
}
/*
* Package.getPackages is caller-sensitve. Call through Foo class
* to find all Packages visible to this TestClassLoader and its ancestors
*/
Package[] getPackagesFromFoo() throws Exception {
Method m = fooClass.getMethod("getPackages");
return (Package[])m.invoke(null);
}
private static long numFooPackages(Package[] pkgs) throws Exception {
return Arrays.stream(pkgs)
.filter(p -> p.getName().equals("foo"))
.count();
}
@DataProvider(name = "loaders")
public static Object[][] testLoaders() {
TestClassLoader loader1 = new TestClassLoader(null);
TestClassLoader loader2 = new TestClassLoader(loader1);
TestClassLoader loader3 = new TestClassLoader(loader2);
// Verify the number of expected Package object of "foo" visible
// to the class loader
return new Object[][] {
{ loader1, 1 },
{ loader2, 2 },
{ loader3, 3 }
};
}
@Test(dataProvider = "loaders")
public static void test(TestClassLoader loader, long expected) throws Exception {
GetPackages test = new GetPackages(loader);
// check package "foo" existence
test.checkPackage();
assertEquals(numFooPackages(test.getPackagesFromLoader()), expected);
assertEquals(numFooPackages(test.getPackagesFromFoo()), expected);
}
}
class TestClassLoader extends ClassLoader {
public TestClassLoader() {
super();
}
public TestClassLoader(ClassLoader parent) {
super(parent);
}
public Package getPackage(String pn) {
return super.getPackage(pn);
}
public Package[] packagesInClassLoaderChain() {
return super.getPackages();
}
@Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
Path p = Paths.get(System.getProperty("test.classes", "."));
try {
byte[] bb = Files.readAllBytes(p.resolve("foo/Foo.class"));
return defineClass(name, bb, 0, bb.length);
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
@Override
protected Class<?> loadClass(String cn, boolean resolve) throws ClassNotFoundException {
if (!cn.equals("foo.Foo"))
return super.loadClass(cn, resolve);
return findClass(cn);
}
}
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