/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* 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.
*
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package com.sun.tools.internal.xjc;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.xml.bind.JAXBContext;
import com.sun.istack.internal.tools.MaskingClassLoader;
import com.sun.istack.internal.tools.ParallelWorldClassLoader;
/**
* Creates a class loader configured to run XJC 1.0/2.0 safely without
* interference with JAXB 2.0 API in Mustang.
*
* @author Kohsuke Kawaguchi
*/
class ClassLoaderBuilder {
/**
* Creates a new class loader that eventually delegates to the given {@link ClassLoader}
* such that XJC can be loaded by using this classloader.
*
* @param v
* Either "1.0" or "2.0", indicating the version of the -source value.
*/
protected static ClassLoader createProtectiveClassLoader(ClassLoader cl, String v) throws ClassNotFoundException, MalformedURLException {
if(noHack) return cl; // provide an escape hatch
boolean mustang = false;
if(JAXBContext.class.getClassLoader()==null) {
// JAXB API is loaded from the bootstrap. We need to override one with ours
mustang = true;
List mask = new ArrayList(Arrays.asList(maskedPackages));
mask.add("javax.xml.bind.");
cl = new MaskingClassLoader(cl,mask);
URL apiUrl = cl.getResource("javax/xml/bind/JAXBPermission.class");
if(apiUrl==null)
throw new ClassNotFoundException("There's no JAXB 2.2 API in the classpath");
cl = new URLClassLoader(new URL[]{ParallelWorldClassLoader.toJarUrl(apiUrl)},cl);
}
//Leave XJC2 in the publicly visible place
// and then isolate XJC1 in a child class loader,
// then use a MaskingClassLoader
// so that the XJC2 classes in the parent class loader
// won't interfere with loading XJC1 classes in a child class loader
if (v.equals("1.0")) {
if(!mustang)
// if we haven't used Masking ClassLoader, do so now.
cl = new MaskingClassLoader(cl,toolPackages);
cl = new ParallelWorldClassLoader(cl,"1.0/");
} else {
if(mustang)
// the whole RI needs to be loaded in a separate class loader
cl = new ParallelWorldClassLoader(cl,"");
}
return cl;
}
/**
* The list of package prefixes we want the
* {@link MaskingClassLoader} to prevent the parent
* classLoader from loading
*/
private static String[] maskedPackages = new String[]{
// toolPackages + alpha
"com.sun.tools.",
"com.sun.codemodel.internal.",
"com.sun.relaxng.",
"com.sun.xml.internal.xsom.",
"com.sun.xml.internal.bind.",
};
private static String[] toolPackages = new String[]{
"com.sun.tools.",
"com.sun.codemodel.internal.",
"com.sun.relaxng.",
"com.sun.xml.internal.xsom."
};
/**
* Escape hatch in case this class loader hack breaks.
*/
public static final boolean noHack = Boolean.getBoolean(XJCFacade.class.getName()+".nohack");
}