Quelle GetPackage.java Sprache: JAVA

/*
* Copyright (c) 1999, 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
* @bug 4256589
* @summary Test if getPackage() and getPackages()
*          return consistent values.
*/

public class GetPackage {
    public static void main(String arg[]) throws Exception {
        TestClassLoader parent = new TestClassLoader();
        TestClassLoader child = new TestClassLoader(parent);
        // child define a package first
        child.defineEmptyPackage("foo");
        // parent then define another package with the same name
        parent.defineEmptyPackage("foo");
        if (!child.testPackageView("foo"))
            throw new Exception("Inconsistent packages view");
    }
}

class TestClassLoader extends ClassLoader {
    public TestClassLoader() {
        super();
    }

    public TestClassLoader(ClassLoader parent) {
        super(parent);
    }

    public Package defineEmptyPackage(String name) {
        return definePackage(name, null, null, null, null, null, null, null);
    }

    /* test to see if getPackage() and getPackages()
     * are consistent.
     */
    public boolean testPackageView(String name) {
        Package[] pkgs = getPackages();
        Package pkg = getPackage(name);
        for(int i = 0; i < pkgs.length; i++)
            if (pkgs[i].getName().equals(name) && pkgs[i] == pkg)
                return true;
        return false;
    }
}

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