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