jdk8-mips64-public/jaxws: src/share/jaxws_classes/com/sun/xml/internal/bind/v2/runtime/reflect/opt/AccessorInjector.java@9c07ef4934dd

     1 /*

     2  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    26 package com.sun.xml.internal.bind.v2.runtime.reflect.opt;

    28 import java.io.InputStream;

    29 import java.util.logging.Level;

    30 import java.util.logging.Logger;

    32 import com.sun.xml.internal.bind.Util;

    33 import com.sun.xml.internal.bind.v2.bytecode.ClassTailor;

    35 /**

    36  * @author Kohsuke Kawaguchi

    37  */

    38 class AccessorInjector {

    40     private static final Logger logger = Util.getClassLogger();

    42     protected static final boolean noOptimize =

    43         Util.getSystemProperty(ClassTailor.class.getName()+".noOptimize")!=null;

    45     static {

    46         if(noOptimize)

    47             logger.info("The optimized code generation is disabled");

    48     }

    50     /**

    51      * Loads the optimized class and returns it.

    52      *

    53      * @return null

    54      *      if it fails for some reason.

    55      */

    56     public static Class<?> prepare(

    57         Class beanClass, String templateClassName, String newClassName, String... replacements ) {

    59         if(noOptimize)

    60             return null;

    62         try {

    63             ClassLoader cl = SecureLoader.getClassClassLoader(beanClass);

    64             if(cl==null)    return null;    // how do I inject classes to this "null" class loader? for now, back off.

    66             Class c = Injector.find(cl,newClassName);

    67             if (c==null) {

    68                 byte[] image = tailor(templateClassName,newClassName,replacements);

    69                 if (image==null) {

    70                     return null;

    71                 }

    72                 c = Injector.inject(cl,newClassName,image);

    73                 if (c == null) {

    74                     Injector.find(cl, newClassName);

    75                 }

    76             }

    77             return c;

    78         } catch(SecurityException e) {

    79             // we don't have enough permission to do this

    80             logger.log(Level.INFO,"Unable to create an optimized TransducedAccessor ",e);

    81             return null;

    82         }

    83     }

    86     /**

    87      * Customizes a class file by replacing constant pools.

    88      *

    89      * @param templateClassName

    90      *      The resource that contains the template class file.

    91      * @param replacements

    92      *      A list of pair of strings that specify the substitution

    93      *      {@code String[]{search_0, replace_0, search_1, replace_1, ..., search_n, replace_n }

    94      *

    95      *      The search strings found in the constant pool will be replaced by the corresponding

    96      *      replacement string.

    97      */

    98     private static byte[] tailor( String templateClassName, String newClassName, String... replacements ) {

    99         InputStream resource;

   100         if(CLASS_LOADER!=null)

   101             resource = CLASS_LOADER.getResourceAsStream(templateClassName+".class");

   102         else

   103             resource = ClassLoader.getSystemResourceAsStream(templateClassName+".class");

   104         if(resource==null)

   105             return null;

   107         return ClassTailor.tailor(resource,templateClassName,newClassName,replacements);

   108     }

   110     private static final ClassLoader CLASS_LOADER = SecureLoader.getClassClassLoader(AccessorInjector.class);

   112 }

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