1 /* 2 * Copyright (c) 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.api.settings; 27 import java.util.HashSet; 28 import java.util.Set; 29 import java.util.StringJoiner; 30 31 import jdk.jfr.Description; 32 import jdk.jfr.Label; 33 import jdk.jfr.MetadataDefinition; 34 import jdk.jfr.SettingControl; 35 36 @Label("String List") 37 @Description("Accepts set of strings, such as \"text\" or \"text1\", \"text2\", or nothing to reject all strings") 38 @MetadataDefinition 39 public final class StringListSetting extends SettingControl { 40 41 private Set<String> acceptedStrings = new HashSet<>(); 42 43 @Override 44 public void setValue(String s) { 45 acceptedStrings = parseSetting(s); 46 } 47 48 private Set<String> parseSetting(String s) { 49 Set<String> stringSet = new HashSet<>(); 50 StringBuilder sb = new StringBuilder(); 51 boolean inString = false; 52 for (int index = 0; index < s.length(); index++) { 53 char c = s.charAt(index); 54 if (c != '"') { 55 if (inString) { 56 // escape double quotes 57 if (c == '\\' && index + 1 < s.length()) { 58 if (s.charAt(index + 1) == '"') { 59 index++; 60 c = '"'; 61 } 62 } 63 sb.append(c); 64 } 65 } else { 66 if (inString) { 67 stringSet.add(sb.toString()); 68 sb.setLength(0); 69 } 70 inString = !inString; 71 } 72 } 73 return stringSet; 74 } 75 76 @Override 77 public String getValue() { 78 StringJoiner sj = new StringJoiner(", ", "\"", "\""); 79 for (String s : acceptedStrings) { 80 sj.add(s); 81 } 82 return sj.toString(); 83 } 84 85 @Override 86 public String combine(Set<String> values) { 87 Set<String> nameSet = new HashSet<>(); 88 for (String s : values) { 89 nameSet.addAll(parseSetting(s)); 90 } 91 if (nameSet.isEmpty()) { 92 return ""; 93 } 94 StringJoiner sj = new StringJoiner(", "); 95 for (String s : nameSet) { 96 s = s.replace("\"", "\\\""); // escape quotes 97 sj.add("\"" + s + "\""); 98 } 99 return sj.toString(); 100 } 101 102 public boolean accept(String string) { 103 return acceptedStrings.contains(string); 104 } 105 }