111 lines
4.0 KiB
Java
111 lines
4.0 KiB
Java
/*
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* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.misc;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.util.Properties;
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import java.util.Set;
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import java.util.jar.JarFile;
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import java.util.jar.Manifest;
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import java.util.jar.Attributes;
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/*
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* Support class used by JVMTI and VM attach mechanism.
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*/
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public class VMSupport {
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private static Properties agentProps = null;
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/**
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* Returns the agent properties.
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*/
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public static synchronized Properties getAgentProperties() {
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if (agentProps == null) {
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agentProps = new Properties();
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initAgentProperties(agentProps);
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}
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return agentProps;
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}
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private static native Properties initAgentProperties(Properties props);
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/**
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* Write the given properties list to a byte array and return it. Properties with
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* a key or value that is not a String is filtered out. The stream written to the byte
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* array is ISO 8859-1 encoded.
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*/
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private static byte[] serializePropertiesToByteArray(Properties p) throws IOException {
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ByteArrayOutputStream out = new ByteArrayOutputStream(4096);
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Properties props = new Properties();
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// stringPropertyNames() returns a snapshot of the property keys
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Set<String> keyset = p.stringPropertyNames();
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for (String key : keyset) {
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String value = p.getProperty(key);
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props.put(key, value);
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}
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props.store(out, null);
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return out.toByteArray();
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}
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public static byte[] serializePropertiesToByteArray() throws IOException {
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return serializePropertiesToByteArray(System.getProperties());
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}
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public static byte[] serializeAgentPropertiesToByteArray() throws IOException {
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return serializePropertiesToByteArray(getAgentProperties());
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}
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/*
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* Returns true if the given JAR file has the Class-Path attribute in the
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* main section of the JAR manifest. Throws RuntimeException if the given
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* path is not a JAR file or some other error occurs.
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*/
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public static boolean isClassPathAttributePresent(String path) {
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try {
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Manifest man = (new JarFile(path)).getManifest();
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if (man != null) {
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if (man.getMainAttributes().getValue(Attributes.Name.CLASS_PATH) != null) {
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return true;
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}
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}
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return false;
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} catch (IOException ioe) {
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throw new RuntimeException(ioe.getMessage());
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}
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}
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/*
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* Return the temporary directory that the VM uses for the attach
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* and perf data files.
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*
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* It is important that this directory is well-known and the
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* same for all VM instances. It cannot be affected by configuration
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* variables such as java.io.tmpdir.
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*/
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public static native String getVMTemporaryDirectory();
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}
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