J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2005 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | package sun.misc; |
| 26 | |
| 27 | import java.io.ByteArrayOutputStream; |
| 28 | import java.io.IOException; |
| 29 | import java.util.Properties; |
| 30 | import java.util.Set; |
| 31 | import java.util.jar.JarFile; |
| 32 | import java.util.jar.Manifest; |
| 33 | import java.util.jar.Attributes; |
| 34 | |
| 35 | /* |
| 36 | * Support class used by JVMTI and VM attach mechanism. |
| 37 | */ |
| 38 | public class VMSupport { |
| 39 | |
| 40 | private static Properties agentProps = null; |
| 41 | /** |
| 42 | * Returns the agent properties. |
| 43 | */ |
| 44 | public static synchronized Properties getAgentProperties() { |
| 45 | if (agentProps == null) { |
| 46 | agentProps = new Properties(); |
| 47 | initAgentProperties(agentProps); |
| 48 | } |
| 49 | return agentProps; |
| 50 | } |
| 51 | private static native Properties initAgentProperties(Properties props); |
| 52 | |
| 53 | /** |
| 54 | * Write the given properties list to a byte array and return it. Properties with |
| 55 | * a key or value that is not a String is filtered out. The stream written to the byte |
| 56 | * array is ISO 8859-1 encoded. |
| 57 | */ |
| 58 | private static byte[] serializePropertiesToByteArray(Properties p) throws IOException { |
| 59 | ByteArrayOutputStream out = new ByteArrayOutputStream(4096); |
| 60 | |
| 61 | Properties props = new Properties(); |
| 62 | |
| 63 | // stringPropertyNames() returns a snapshot of the property keys |
| 64 | Set<String> keyset = p.stringPropertyNames(); |
| 65 | for (String key : keyset) { |
| 66 | String value = p.getProperty(key); |
| 67 | props.put(key, value); |
| 68 | } |
| 69 | |
| 70 | props.store(out, null); |
| 71 | return out.toByteArray(); |
| 72 | } |
| 73 | |
| 74 | public static byte[] serializePropertiesToByteArray() throws IOException { |
| 75 | return serializePropertiesToByteArray(System.getProperties()); |
| 76 | } |
| 77 | |
| 78 | public static byte[] serializeAgentPropertiesToByteArray() throws IOException { |
| 79 | return serializePropertiesToByteArray(getAgentProperties()); |
| 80 | } |
| 81 | |
| 82 | /* |
| 83 | * Returns true if the given JAR file has the Class-Path attribute in the |
| 84 | * main section of the JAR manifest. Throws RuntimeException if the given |
| 85 | * path is not a JAR file or some other error occurs. |
| 86 | */ |
| 87 | public static boolean isClassPathAttributePresent(String path) { |
| 88 | try { |
| 89 | Manifest man = (new JarFile(path)).getManifest(); |
| 90 | if (man != null) { |
| 91 | if (man.getMainAttributes().getValue(Attributes.Name.CLASS_PATH) != null) { |
| 92 | return true; |
| 93 | } |
| 94 | } |
| 95 | return false; |
| 96 | } catch (IOException ioe) { |
| 97 | throw new RuntimeException(ioe.getMessage()); |
| 98 | } |
| 99 | } |
| 100 | } |