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| 1 | +/* | |
| 2 | + * Copyright (c) 2005, 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 | +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 | +} | |