| /* |
| * Copyright (c) 2013, 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.management.jdp; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| |
| /** |
| * JdpPacketWriter responsible for writing a packet |
| * <p>This class assembles a set of key/value pairs to valid JDP packet, |
| * ready to be sent across a Net</p> |
| */ |
| public final class JdpPacketWriter { |
| |
| private final ByteArrayOutputStream baos; |
| private final DataOutputStream pkt; |
| |
| /** |
| * Create a JDP packet, add mandatory magic and version headers |
| * |
| * @throws IOException |
| */ |
| public JdpPacketWriter() |
| throws IOException { |
| baos = new ByteArrayOutputStream(); |
| pkt = new DataOutputStream(baos); |
| |
| pkt.writeInt(JdpGenericPacket.getMagic()); |
| pkt.writeShort(JdpGenericPacket.getVersion()); |
| } |
| |
| /** |
| * Put string entry to packet |
| * |
| * @param entry - string to put (utf-8 encoded) |
| * @throws IOException |
| */ |
| public void addEntry(String entry) |
| throws IOException { |
| /* DataOutputStream.writeUTF() do essentially |
| * the same as: |
| * pkt.writeShort(entry.getBytes("UTF-8").length); |
| * pkt.write(entry.getBytes("UTF-8")); |
| */ |
| pkt.writeUTF(entry); |
| } |
| |
| /** |
| * Put key/value pair to packet |
| * |
| * @param key - key to put (utf-8 encoded) |
| * @param val - value to put (utf-8 encoded) |
| * @throws IOException |
| */ |
| public void addEntry(String key, String val) |
| throws IOException { |
| /* Silently skip key if value is null. |
| * We don't need to distinguish between key missing |
| * and key has no value cases |
| */ |
| if (val != null) { |
| addEntry(key); |
| addEntry(val); |
| } |
| } |
| |
| /** |
| * Return assembled packet as a byte array |
| * |
| * @return packet bytes |
| */ |
| public byte[] getPacketBytes() { |
| return baos.toByteArray(); |
| } |
| } |