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 org.openjdk.buildtools.symbolgenerator;
  27 
  28 import java.io.BufferedInputStream;
  29 import java.io.ByteArrayOutputStream;
  30 import java.io.File;
  31 import java.io.FileOutputStream;
  32 import java.io.IOException;
  33 import java.io.InputStream;
  34 import java.io.OutputStream;
  35 import java.nio.charset.Charset;
  36 import java.util.EnumSet;
  37 
  38 import javax.tools.JavaCompiler;
  39 import javax.tools.JavaFileObject;
  40 import javax.tools.JavaFileObject.Kind;
  41 import javax.tools.StandardJavaFileManager;
  42 import javax.tools.StandardLocation;
  43 import javax.tools.ToolProvider;
  44 
  45 /**A tool to dump the content of the default javac's bootclasspath. This tool should not use any
  46  * features not available on the oldest supported target JDK, which is currently JDK 6.
  47  *
  48  * For more information on use of this site, please see CreateSymbols.
  49  */
  50 public class Probe {
  51 
  52     public static void main(String... args) throws IOException {
  53         if (args.length != 1) {
  54             System.err.println("Not enough arguments.");
  55             System.err.println("Usage:");
  56             System.err.println("    java " + Probe.class.getName() + " <output-file>");
  57             return ;
  58         }
  59 
  60         File outFile = new File(args[0]);
  61         Charset cs = Charset.forName("UTF-8");
  62         JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
  63         StandardJavaFileManager fm = compiler.getStandardFileManager(null, null, null);
  64         OutputStream out = new FileOutputStream(outFile);
  65 
  66         try {
  67             Iterable<JavaFileObject> bcpFiles =
  68                     fm.list(StandardLocation.PLATFORM_CLASS_PATH, "", EnumSet.of(Kind.CLASS), true);
  69 
  70             for (JavaFileObject jfo : bcpFiles) {
  71                 InputStream in = new BufferedInputStream(jfo.openInputStream());
  72                 try {
  73                     ByteArrayOutputStream baos = new ByteArrayOutputStream();
  74                     StringBuilder textual = new StringBuilder();
  75                     int read;
  76 
  77                     while ((read = in.read()) != (-1)) {
  78                         baos.write(read);
  79                         textual.append(String.format("%02x", read));
  80                     }
  81 
  82                     textual.append("\n");
  83                     out.write(textual.toString().getBytes(cs));
  84                 } finally {
  85                     in.close();
  86                 }
  87             }
  88         } finally {
  89             out.close();
  90         }
  91     }
  92 
  93 }