1 /*

     2  * Copyright (c) 2012, 2018, 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 jdk.jfr.internal.jfc;

    27 

    28 import java.io.CharArrayReader;

    29 import java.io.CharArrayWriter;

    30 import java.io.IOException;

    31 import java.io.Reader;

    32 import java.text.ParseException;

    33 import jdk.internal.org.xml.sax.InputSource;

    34 import jdk.internal.org.xml.sax.SAXException;

    35 import jdk.internal.util.xml.SAXParser;

    36 import jdk.internal.util.xml.impl.SAXParserImpl;

    37 import jdk.jfr.Configuration;

    38 

    39 import jdk.jfr.internal.PrivateAccess;

    40 

    41 /**

    42  * Parses a JDK Flight Recorder Configuration file (.jfc)

    43  */

    44 final class JFCParser {

    45     static final String FILE_EXTENSION = ".jfc";

    46     private static final int MAXIMUM_FILE_SIZE = 1024 * 1024;

    47 

    48     public static Configuration createConfiguration(String name, Reader reader) throws IOException, ParseException {

    49         return createConfiguration(name, readContent(reader));

    50     }

    51 

    52     public static Configuration createConfiguration(String name, String content) throws IOException, ParseException {

    53         try {

    54             JFCParserHandler ch = new JFCParserHandler();

    55             parseXML(content, ch);

    56             return PrivateAccess.getInstance().newConfiguration(name, ch.label, ch.description, ch.provider, ch.settings, content);

    57         } catch (IllegalArgumentException iae) {

    58             throw new ParseException(iae.getMessage(), -1);

    59         } catch (SAXException e) {

    60             ParseException pe =  new ParseException("Error reading JFC file. " + e.getMessage(), -1);

    61             pe.initCause(e);

    62             throw pe;

    63         }

    64     }

    65 

    66     private static void parseXML(String content, JFCParserHandler ch) throws SAXException, IOException {

    67         CharArrayReader r = new CharArrayReader(content.toCharArray());

    68         SAXParser parser = new SAXParserImpl();

    69         parser.parse(new InputSource(r), ch);

    70     }

    71 

    72     private static String readContent(Reader r) throws IOException {

    73         CharArrayWriter writer = new CharArrayWriter(1024);

    74         int count = 0;

    75         int ch;

    76         while ((ch = r.read()) != -1) {

    77             writer.write(ch);

    78             count++;

    79             if (count >= MAXIMUM_FILE_SIZE) {

    80                 throw new IOException("Presets with more than " + MAXIMUM_FILE_SIZE + " characters can't be read.");

    81             }

    82         }

    83         return new String(writer.toCharArray());

    84     }

    85 }