1 /* 2 * Copyright (c) 2012, 2019, 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 }