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/*
* Copyright (c) 2010, 2013, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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.
*/
package jdk.nashorn.internal.runtime;
import static jdk.nashorn.internal.codegen.Compiler.SCRIPTS_PACKAGE;
import static jdk.nashorn.internal.codegen.Compiler.binaryName;
import static jdk.nashorn.internal.codegen.CompilerConstants.JS_OBJECT_PREFIX;
import java.security.ProtectionDomain;
import jdk.nashorn.internal.codegen.ObjectClassGenerator;
/**
* Responsible for on the fly construction of structure classes.
*
*/
final class StructureLoader extends NashornLoader {
private static final String JS_OBJECT_PREFIX_EXTERNAL = binaryName(SCRIPTS_PACKAGE) + '.' + JS_OBJECT_PREFIX.symbolName();
/**
* Constructor.
*/
StructureLoader(final ClassLoader parent, final Context context) {
super(parent, context);
}
@Override
protected synchronized Class<?> loadClass(final String name, final boolean resolve) throws ClassNotFoundException {
// check the cache first
final Class<?> loadedClass = findLoadedClass(name);
if (loadedClass != null) {
if (resolve) {
resolveClass(loadedClass);
}
return loadedClass;
}
return super.loadClassTrusted(name, resolve);
}
@Override
protected Class<?> findClass(final String name) throws ClassNotFoundException {
if (name.startsWith(JS_OBJECT_PREFIX_EXTERNAL)) {
return generateClass(name, name.substring(JS_OBJECT_PREFIX_EXTERNAL.length()));
}
return super.findClass(name);
}
/**
* Generate a layout class.
* @param name Name of class.
* @param descriptor Layout descriptor.
* @return Generated class.
*/
private Class<?> generateClass(final String name, final String descriptor) {
Context context = getContext();
if (context == null) {
context = Context.getContextTrusted();
}
final byte[] code = new ObjectClassGenerator(context).generate(descriptor);
return defineClass(name, code, 0, code.length, new ProtectionDomain(null, getPermissions(null)));
}
}
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