javassist.util.proxy.DefinePackageHelper Maven / Gradle / Ivy
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/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later,
* or the Apache License Version 2.0.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package javassist.util.proxy;
import java.lang.invoke.MethodHandle;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.URL;
import javassist.CannotCompileException;
import javassist.CtClass;
import javassist.bytecode.ClassFile;
/**
* Helper class for invoking {@link ClassLoader#defineClass(String,byte[],int,int)}.
*
* @since 3.22
*/
public class DefinePackageHelper
{
private static abstract class Helper {
abstract Package definePackage(ClassLoader loader, String name, String specTitle,
String specVersion, String specVendor, String implTitle, String implVersion,
String implVendor, URL sealBase)
throws IllegalArgumentException;
}
private static class Java9 extends Helper {
// definePackage has been discontinued for JAVA 9
@Override
Package definePackage(ClassLoader loader, String name, String specTitle,
String specVersion, String specVendor, String implTitle, String implVersion,
String implVendor, URL sealBase)
throws IllegalArgumentException
{
throw new RuntimeException("define package has been disabled for jigsaw");
}
};
private static class Java7 extends Helper {
private final SecurityActions stack = SecurityActions.stack;
private final MethodHandle definePackage = getDefinePackageMethodHandle();
private MethodHandle getDefinePackageMethodHandle() {
if (stack.getCallerClass() != this.getClass())
throw new IllegalAccessError("Access denied for caller.");
try {
return SecurityActions.getMethodHandle(ClassLoader.class,
"definePackage", new Class[] {
String.class, String.class, String.class, String.class,
String.class, String.class, String.class, URL.class
});
} catch (NoSuchMethodException e) {
throw new RuntimeException("cannot initialize", e);
}
}
@Override
Package definePackage(ClassLoader loader, String name, String specTitle,
String specVersion, String specVendor, String implTitle, String implVersion,
String implVendor, URL sealBase)
throws IllegalArgumentException
{
if (stack.getCallerClass() != DefinePackageHelper.class)
throw new IllegalAccessError("Access denied for caller.");
try {
return (Package) definePackage.invokeWithArguments(loader, name, specTitle,
specVersion, specVendor, implTitle, implVersion, implVendor, sealBase);
} catch (Throwable e) {
if (e instanceof IllegalArgumentException) throw (IllegalArgumentException) e;
if (e instanceof RuntimeException) throw (RuntimeException) e;
}
return null;
}
}
private static class JavaOther extends Helper {
private final SecurityActions stack = SecurityActions.stack;
private final Method definePackage = getDefinePackageMethod();
private Method getDefinePackageMethod() {
if (stack.getCallerClass() != this.getClass())
throw new IllegalAccessError("Access denied for caller.");
try {
return SecurityActions.getDeclaredMethod(ClassLoader.class,
"definePackage", new Class[] {
String.class, String.class, String.class, String.class,
String.class, String.class, String.class, URL.class
});
} catch (NoSuchMethodException e) {
throw new RuntimeException("cannot initialize", e);
}
}
@Override
Package definePackage(ClassLoader loader, String name, String specTitle,
String specVersion, String specVendor, String implTitle, String implVersion,
String implVendor, URL sealBase)
throws IllegalArgumentException
{
if (stack.getCallerClass() != DefinePackageHelper.class)
throw new IllegalAccessError("Access denied for caller.");
try {
definePackage.setAccessible(true);
return (Package) definePackage.invoke(loader, new Object[] {
name, specTitle, specVersion, specVendor, implTitle,
implVersion, implVendor, sealBase
});
} catch (Throwable e) {
if (e instanceof InvocationTargetException) {
Throwable t = ((InvocationTargetException) e).getTargetException();
if (t instanceof IllegalArgumentException)
throw (IllegalArgumentException) t;
}
if (e instanceof RuntimeException) throw (RuntimeException) e;
}
return null;
}
};
private static final Helper privileged
= ClassFile.MAJOR_VERSION >= ClassFile.JAVA_9
? new Java9() : ClassFile.MAJOR_VERSION >= ClassFile.JAVA_7
? new Java7() : new JavaOther();
/**
* Defines a new package. If the package is already defined, this method
* performs nothing.
*
* You do not necessarily need to
* call this method. If this method is called, then
* getPackage() on the Class object returned
* by toClass() will return a non-null object.
*
* The jigsaw module introduced by Java 9 has broken this method.
* In Java 9 or later, the VM argument
* --add-opens java.base/java.lang=ALL-UNNAMED
* has to be given to the JVM so that this method can run.
*
*
* @param loader the class loader passed to toClass() or
* the default one obtained by getClassLoader().
* @param className the package name.
* @see Class#getClassLoader()
* @see CtClass#toClass()
*/
public static void definePackage(String className, ClassLoader loader)
throws CannotCompileException
{
try {
privileged.definePackage(loader, className,
null, null, null, null, null, null, null);
}
catch (IllegalArgumentException e) {
// if the package is already defined, an IllegalArgumentException
// is thrown.
return;
}
catch (Exception e) {
throw new CannotCompileException(e);
}
}
private DefinePackageHelper() {}
}