/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

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

 *

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

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

 * published by the Free Software Foundation.  Oracle designates this

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

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

 *

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

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

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

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

 * accompanied this code).

 *

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

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

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

 *

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

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

 * questions.

 */

package build.tools.symbolgenerator;

import java.io.BufferedInputStream;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.nio.charset.Charset;

import java.util.EnumSet;

import javax.tools.JavaCompiler;

import javax.tools.JavaFileObject;

import javax.tools.JavaFileObject.Kind;

import javax.tools.StandardJavaFileManager;

import javax.tools.StandardLocation;

import javax.tools.ToolProvider;

/**A tool to dump the content of the default javac's bootclasspath. This tool should not use any

 * features not available on the oldest supported target JDK, which is currently JDK 6.

 *

 * For more information on use of this site, please see CreateSymbols.

 */

public class Probe {

    public static void main(String... args) throws IOException {

        if (args.length != 1) {

            System.err.println("Not enough arguments.");

            System.err.println("Usage:");

            System.err.println("    java " + Probe.class.getName() + " <output-file>");

            return ;

        }

        File outFile = new File(args[0]);

        Charset cs = Charset.forName("UTF-8");

        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();

        StandardJavaFileManager fm = compiler.getStandardFileManager(null, null, null);

        OutputStream out = new FileOutputStream(outFile);

        try {

            Iterable<JavaFileObject> bcpFiles =

                    fm.list(StandardLocation.PLATFORM_CLASS_PATH, "", EnumSet.of(Kind.CLASS), true);

            for (JavaFileObject jfo : bcpFiles) {

                InputStream in = new BufferedInputStream(jfo.openInputStream());

                try {

                    ByteArrayOutputStream baos = new ByteArrayOutputStream();

                    StringBuilder textual = new StringBuilder();

                    int read;

                    while ((read = in.read()) != (-1)) {

                        baos.write(read);

                        textual.append(String.format("%02x", read));

                    }

                    textual.append("\n");

                    out.write(textual.toString().getBytes(cs));

                } finally {

                    in.close();

                }

            }

        } finally {

            out.close();

        }

    }

}