d892ac8d4c
Improve the message to display the right referring class. Reviewed-by: acorn, goetz, dholmes
74 lines
2.8 KiB
Java
74 lines
2.8 KiB
Java
/*
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* Copyright (c) 2018, 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.
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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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*/
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package pkg;
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import java.util.*;
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import java.io.*;
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// This class loader loads Foo, Child, and Grand.
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public class ClassLoaderForChildGrandFoo extends ClassLoader {
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ClassLoader l2 = null;
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private final Set<String> names = new HashSet<>();
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public ClassLoaderForChildGrandFoo(String... names) {
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for (String n : names) this.names.add(n);
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}
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protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
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// Create class loader l2 to load Parent and Foo. And, pass this class
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// loader to l2 so l2 can use it to load Grand.
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if (name.contains("Parent") && l2 == null) {
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l2 = new ClassLoaderForParentFoo(this, "pkg.Foo", "pkg.Grand", "pkg.Parent");
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Class<?> b = l2.loadClass("pkg.Parent");
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return b;
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}
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if (!names.contains(name)) return super.loadClass(name, resolve);
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Class<?> result = findLoadedClass(name);
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if (result == null) {
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String filename = name.replace('.', '/') + ".class";
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try (InputStream data = getResourceAsStream(filename)) {
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if (data == null) throw new ClassNotFoundException();
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try (ByteArrayOutputStream buffer = new ByteArrayOutputStream()) {
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int b;
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do {
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b = data.read();
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if (b >= 0) buffer.write(b);
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} while (b >= 0);
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byte[] bytes = buffer.toByteArray();
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result = defineClass(name, bytes, 0, bytes.length);
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}
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} catch (IOException e) {
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throw new ClassNotFoundException("Error reading class file", e);
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}
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}
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if (resolve) resolveClass(result);
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return result;
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}
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}
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