1 /* 2 * Copyright (c) 2016, 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 import java.util.LinkedHashMap; 28 import java.util.Map; 29 30 import jdk.internal.org.xml.sax.Attributes; 31 import jdk.internal.org.xml.sax.SAXException; 32 import jdk.internal.org.xml.sax.helpers.DefaultHandler; 33 34 final class JFCParserHandler extends DefaultHandler { 35 private static final String ELEMENT_CONFIGURATION = "configuration"; 36 private static final String ELEMENT_EVENT_TYPE = "event"; 37 private static final String ELEMENT_SETTING = "setting"; 38 private static final String ATTRIBUTE_NAME = "name"; 39 private static final String ATTRIBUTE_LABEL = "label"; 40 private static final String ATTRIBUTE_DESCRIPTION = "description"; 41 private static final String ATTRIBUTE_PROVIDER = "provider"; 42 private static final String ATTRIBUTE_VERSION = "version"; 43 44 final Map<String, String> settings = new LinkedHashMap<String, String>(); 45 private String currentEventPath; 46 private String currentSettingsName; 47 private StringBuilder currentCharacters; 48 String label; 49 String provider; 50 String description; 51 52 @Override 53 public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { 54 switch (qName.toLowerCase()) { 55 case ELEMENT_CONFIGURATION: 56 String version = attributes.getValue(ATTRIBUTE_VERSION); 57 if (version == null || !version.startsWith("2.")) { 58 throw new SAXException("This version of Flight Recorder can only read JFC file format version 2.x"); 59 } 60 label = attributes.getValue(ATTRIBUTE_LABEL); 61 description = getOptional(attributes, ATTRIBUTE_DESCRIPTION, ""); 62 provider = getOptional(attributes, ATTRIBUTE_PROVIDER, ""); 63 break; 64 case ELEMENT_EVENT_TYPE: 65 currentEventPath = attributes.getValue(ATTRIBUTE_NAME); 66 break; 67 case ELEMENT_SETTING: 68 currentSettingsName = attributes.getValue(ATTRIBUTE_NAME); 69 break; 70 } 71 currentCharacters = null; 72 } 73 74 private String getOptional(Attributes attributes, String name, String defaultValue) { 75 String value = attributes.getValue(name); 76 return value == null ? defaultValue : value; 77 } 78 79 @Override 80 public void characters(char[] ch, int start, int length) throws SAXException { 81 if (currentCharacters == null) { 82 currentCharacters = new StringBuilder(length); 83 } 84 currentCharacters.append(ch, start, length); 85 } 86 87 @Override 88 public void endElement(String uri, String localName, String qName) { 89 switch (qName.toLowerCase()) { 90 case ELEMENT_CONFIGURATION: 91 break; 92 case ELEMENT_EVENT_TYPE: 93 currentEventPath = null; 94 break; 95 case ELEMENT_SETTING: 96 String settingsValue = currentCharacters == null ? "" : currentCharacters.toString(); 97 settings.put(currentEventPath + "#" + currentSettingsName, "" + settingsValue); 98 currentSettingsName = null; 99 break; 100 } 101 } 102 103 public Map<String, String> getSettings() { 104 return settings; 105 } 106 }