/*
* 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.tools.reflect;
import java.io.PrintStream;
import javassist.ClassPool;
import javassist.CtClass;
class CompiledClass {
public String classname;
public String metaobject;
public String classobject;
}
A bytecode translator for reflection.
This translator directly modifies class files on a local disk so that
the classes represented by those class files are reflective.
After the modification, the class files can be run with the standard JVM
without javassist.tools.reflect.Loader
or any other user-defined class loader.
The modified class files are given as the command-line parameters,
which are a sequence of fully-qualified class names followed by options:
-m classname
: specifies the class of the
metaobjects associated with instances of the class followed by
this option. The default is javassit.reflect.Metaobject
.
-c classname
: specifies the class of the
class metaobjects associated with instances of the class followed by
this option. The default is javassit.reflect.ClassMetaobject
.
If a class name is not followed by any options, the class indicated
by that class name is not reflective.
For example,
% java Compiler Dog -m MetaDog -c CMetaDog Cat -m MetaCat Cow
modifies class files Dog.class
, Cat.class
,
and Cow.class
.
The metaobject of a Dog object is a MetaDog object and the class
metaobject is a CMetaDog object.
The metaobject of a Cat object is a MetaCat object but
the class metaobject is a default one.
Cow objects are not reflective.
Note that if the super class is also made reflective, it must be done
before the sub class.
See Also: - Metaobject
- ClassMetaobject
- Reflection
/**
* A bytecode translator for reflection.
*
* <p>This translator directly modifies class files on a local disk so that
* the classes represented by those class files are reflective.
* After the modification, the class files can be run with the standard JVM
* without <code>javassist.tools.reflect.Loader</code>
* or any other user-defined class loader.
*
* <p>The modified class files are given as the command-line parameters,
* which are a sequence of fully-qualified class names followed by options:
*
* <p><code>-m <i>classname</i></code> : specifies the class of the
* metaobjects associated with instances of the class followed by
* this option. The default is <code>javassit.reflect.Metaobject</code>.
*
* <p><code>-c <i>classname</i></code> : specifies the class of the
* class metaobjects associated with instances of the class followed by
* this option. The default is <code>javassit.reflect.ClassMetaobject</code>.
*
* <p>If a class name is not followed by any options, the class indicated
* by that class name is not reflective.
*
* <p>For example,
* <pre>% java Compiler Dog -m MetaDog -c CMetaDog Cat -m MetaCat Cow
* </pre>
*
* <p>modifies class files <code>Dog.class</code>, <code>Cat.class</code>,
* and <code>Cow.class</code>.
* The metaobject of a Dog object is a MetaDog object and the class
* metaobject is a CMetaDog object.
* The metaobject of a Cat object is a MetaCat object but
* the class metaobject is a default one.
* Cow objects are not reflective.
*
* <p>Note that if the super class is also made reflective, it must be done
* before the sub class.
*
* @see javassist.tools.reflect.Metaobject
* @see javassist.tools.reflect.ClassMetaobject
* @see javassist.tools.reflect.Reflection
*/
public class Compiler {
public static void main(String[] args) throws Exception {
if (args.length == 0) {
help(System.err);
return;
}
CompiledClass[] entries = new CompiledClass[args.length];
int n = parse(args, entries);
if (n < 1) {
System.err.println("bad parameter.");
return;
}
processClasses(entries, n);
}
private static void processClasses(CompiledClass[] entries, int n)
throws Exception
{
Reflection implementor = new Reflection();
ClassPool pool = ClassPool.getDefault();
implementor.start(pool);
for (int i = 0; i < n; ++i) {
CtClass c = pool.get(entries[i].classname);
if (entries[i].metaobject != null
|| entries[i].classobject != null) {
String metaobj, classobj;
if (entries[i].metaobject == null)
metaobj = "javassist.tools.reflect.Metaobject";
else
metaobj = entries[i].metaobject;
if (entries[i].classobject == null)
classobj = "javassist.tools.reflect.ClassMetaobject";
else
classobj = entries[i].classobject;
if (!implementor.makeReflective(c, pool.get(metaobj),
pool.get(classobj)))
System.err.println("Warning: " + c.getName()
+ " is reflective. It was not changed.");
System.err.println(c.getName() + ": " + metaobj + ", "
+ classobj);
}
else
System.err.println(c.getName() + ": not reflective");
}
for (int i = 0; i < n; ++i) {
implementor.onLoad(pool, entries[i].classname);
pool.get(entries[i].classname).writeFile();
}
}
private static int parse(String[] args, CompiledClass[] result) {
int n = -1;
for (int i = 0; i < args.length; ++i) {
String a = args[i];
if (a.equals("-m"))
if (n < 0 || i + 1 > args.length)
return -1;
else
result[n].metaobject = args[++i];
else if (a.equals("-c"))
if (n < 0 || i + 1 > args.length)
return -1;
else
result[n].classobject = args[++i];
else if (a.charAt(0) == '-')
return -1;
else {
CompiledClass cc = new CompiledClass();
cc.classname = a;
cc.metaobject = null;
cc.classobject = null;
result[++n] = cc;
}
}
return n + 1;
}
private static void help(PrintStream out) {
out.println("Usage: java javassist.tools.reflect.Compiler");
out.println(" (<class> [-m <metaobject>] [-c <class metaobject>])+");
}
}