1 /*
   2  * Copyright (c) 2015, 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  */
  25 
  26 package com.sun.javafx;
  27 
  28 import java.io.InputStream;
  29 import java.lang.reflect.InvocationTargetException;
  30 import java.lang.reflect.Method;
  31 import java.security.AccessController;
  32 import java.security.PrivilegedAction;
  33 
  34 public class ModuleHelper {
  35     private static final Method getModuleMethod;
  36     private static final Method addReadsMethod;
  37     private static final Method addExportsMethod;
  38     private static final Method getResourceAsStreamMethod;
  39 
  40     private static final boolean verbose;
  41 
  42     static {
  43         verbose = AccessController.doPrivileged((PrivilegedAction<Boolean>) () ->
  44                 Boolean.getBoolean("javafx.verbose"));
  45 
  46         if (verbose) {
  47             System.err.println("" + ModuleHelper.class.getName() + " : <clinit>");
  48         }
  49         Method mGetModule = null;
  50         Method mAddReads = null;
  51         Method mAddExports = null;
  52         Method mGetResourceAsStream = null;
  53         try {
  54             mGetModule = Class.class.getMethod("getModule");
  55             Class<?> moduleClass = mGetModule.getReturnType();
  56             mAddReads = moduleClass.getMethod("addReads", moduleClass);
  57             mAddExports = moduleClass.getMethod("addExports", String.class, moduleClass);
  58             mGetResourceAsStream = moduleClass.getMethod("getResourceAsStream", String.class);
  59         } catch (NoSuchMethodException e) {
  60             // ignore
  61         }
  62         getModuleMethod = mGetModule;
  63         addReadsMethod = mAddReads;
  64         addExportsMethod = mAddExports;
  65         getResourceAsStreamMethod = mGetResourceAsStream;
  66         if (verbose) {
  67             System.err.println("getModuleMethod = " + getModuleMethod);
  68             System.err.println("addReadsMethod = " + addReadsMethod);
  69             System.err.println("addExportsMethod = " + addExportsMethod);
  70             System.err.println("getResourceAsStreamMethod = " + getResourceAsStreamMethod);
  71         }
  72     }
  73 
  74     public static Object getModule(Class clazz) {
  75         if (getModuleMethod != null) {
  76             try {
  77                 return getModuleMethod.invoke(clazz);
  78             } catch (IllegalAccessException | InvocationTargetException ex) {
  79                 throw new RuntimeException(ex);
  80             }
  81         }
  82         return null;
  83     }
  84 
  85     public static void addReads(Object thisModule, Object targetModule) {
  86         if (addReadsMethod != null) {
  87             try {
  88                 addReadsMethod.invoke(thisModule, targetModule);
  89             } catch (IllegalAccessException | InvocationTargetException ex) {
  90                 throw new RuntimeException(ex);
  91             }
  92         }
  93     }
  94 
  95     public static void addExports(Object thisModule, String packageName, Object targetModule) {
  96         if (addExportsMethod != null) {
  97             try {
  98                 addExportsMethod.invoke(thisModule, packageName, targetModule);
  99             } catch (IllegalAccessException | InvocationTargetException ex) {
 100                 throw new RuntimeException(ex);
 101             }
 102         }
 103     }
 104 
 105     public static InputStream getResourceAsStream(Object thisModule, String name) {
 106         if (getResourceAsStreamMethod != null) {
 107             try {
 108                 return (InputStream)getResourceAsStreamMethod.invoke(thisModule, name);
 109             } catch (IllegalAccessException | InvocationTargetException ex) {
 110                 throw new RuntimeException(ex);
 111             }
 112         }
 113         return null;
 114     }
 115 }