ohair@286: /*
mkos@408:  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
ohair@286:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ohair@286:  *
ohair@286:  * This code is free software; you can redistribute it and/or modify it
ohair@286:  * under the terms of the GNU General Public License version 2 only, as
ohair@286:  * published by the Free Software Foundation.  Oracle designates this
ohair@286:  * particular file as subject to the "Classpath" exception as provided
ohair@286:  * by Oracle in the LICENSE file that accompanied this code.
ohair@286:  *
ohair@286:  * This code is distributed in the hope that it will be useful, but WITHOUT
ohair@286:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ohair@286:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
ohair@286:  * version 2 for more details (a copy is included in the LICENSE file that
ohair@286:  * accompanied this code).
ohair@286:  *
ohair@286:  * You should have received a copy of the GNU General Public License version
ohair@286:  * 2 along with this work; if not, write to the Free Software Foundation,
ohair@286:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ohair@286:  *
ohair@286:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
ohair@286:  * or visit www.oracle.com if you need additional information or have any
ohair@286:  * questions.
ohair@286:  */
ohair@286: 
ohair@286: package com.sun.xml.internal.bind.v2.runtime.reflect.opt;
ohair@286: 
ohair@286: import java.io.InputStream;
ohair@286: import java.util.logging.Level;
ohair@286: import java.util.logging.Logger;
ohair@286: 
ohair@286: import com.sun.xml.internal.bind.Util;
ohair@286: import com.sun.xml.internal.bind.v2.bytecode.ClassTailor;
ohair@286: 
ohair@286: /**
ohair@286:  * @author Kohsuke Kawaguchi
ohair@286:  */
ohair@286: class AccessorInjector {
ohair@286: 
ohair@286:     private static final Logger logger = Util.getClassLogger();
ohair@286: 
ohair@286:     protected static final boolean noOptimize =
ohair@286:         Util.getSystemProperty(ClassTailor.class.getName()+".noOptimize")!=null;
ohair@286: 
ohair@286:     static {
ohair@286:         if(noOptimize)
ohair@286:             logger.info("The optimized code generation is disabled");
ohair@286:     }
ohair@286: 
ohair@286:     /**
ohair@286:      * Loads the optimized class and returns it.
ohair@286:      *
ohair@286:      * @return null
ohair@286:      *      if it fails for some reason.
ohair@286:      */
ohair@286:     public static Class<?> prepare(
ohair@286:         Class beanClass, String templateClassName, String newClassName, String... replacements ) {
ohair@286: 
ohair@286:         if(noOptimize)
ohair@286:             return null;
ohair@286: 
ohair@286:         try {
ohair@286:             ClassLoader cl = SecureLoader.getClassClassLoader(beanClass);
ohair@286:             if(cl==null)    return null;    // how do I inject classes to this "null" class loader? for now, back off.
ohair@286: 
mkos@408:             Class c = Injector.find(cl,newClassName);
mkos@408:             if (c==null) {
mkos@408:                 byte[] image = tailor(templateClassName,newClassName,replacements);
mkos@408:                 if (image==null) {
mkos@408:                     return null;
mkos@408:                 }
mkos@408:                 c = Injector.inject(cl,newClassName,image);
mkos@408:                 if (c == null) {
mkos@408:                     Injector.find(cl, newClassName);
ohair@286:                 }
ohair@286:             }
ohair@286:             return c;
ohair@286:         } catch(SecurityException e) {
ohair@286:             // we don't have enough permission to do this
ohair@286:             logger.log(Level.INFO,"Unable to create an optimized TransducedAccessor ",e);
ohair@286:             return null;
ohair@286:         }
ohair@286:     }
ohair@286: 
ohair@286: 
ohair@286:     /**
ohair@286:      * Customizes a class file by replacing constant pools.
ohair@286:      *
ohair@286:      * @param templateClassName
alanb@368:      *      The resource that contains the template class file.
ohair@286:      * @param replacements
ohair@286:      *      A list of pair of strings that specify the substitution
ohair@286:      *      {@code String[]{search_0, replace_0, search_1, replace_1, ..., search_n, replace_n }
ohair@286:      *
ohair@286:      *      The search strings found in the constant pool will be replaced by the corresponding
ohair@286:      *      replacement string.
ohair@286:      */
ohair@286:     private static byte[] tailor( String templateClassName, String newClassName, String... replacements ) {
ohair@286:         InputStream resource;
ohair@286:         if(CLASS_LOADER!=null)
ohair@286:             resource = CLASS_LOADER.getResourceAsStream(templateClassName+".class");
ohair@286:         else
ohair@286:             resource = ClassLoader.getSystemResourceAsStream(templateClassName+".class");
ohair@286:         if(resource==null)
ohair@286:             return null;
ohair@286: 
ohair@286:         return ClassTailor.tailor(resource,templateClassName,newClassName,replacements);
ohair@286:     }
ohair@286: 
ohair@286:     private static final ClassLoader CLASS_LOADER = SecureLoader.getClassClassLoader(AccessorInjector.class);
mkos@408: 
ohair@286: }