| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| */ |
| |
| package org.apache.directory.server.ntp.io; |
| |
| |
| import java.nio.ByteBuffer; |
| |
| import org.apache.directory.server.ntp.messages.LeapIndicatorType; |
| import org.apache.directory.server.ntp.messages.ModeType; |
| import org.apache.directory.server.ntp.messages.NtpMessage; |
| import org.apache.directory.server.ntp.messages.ReferenceIdentifier; |
| |
| |
| /** |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| * @version $Rev$, $Date$ |
| */ |
| public class NtpMessageEncoder |
| { |
| /** |
| * Encodes the {@link NtpMessage} into the {@link ByteBuffer}. |
| * |
| * @param byteBuffer |
| * @param message |
| */ |
| public void encode( ByteBuffer byteBuffer, NtpMessage message ) |
| { |
| byte header = 0x00; |
| header = encodeLeapIndicator( message.getLeapIndicator(), header ); |
| header = encodeVersionNumber( message.getVersionNumber(), header ); |
| header = encodeMode( message.getMode(), header ); |
| byteBuffer.put( header ); |
| |
| byteBuffer.put( ( byte ) ( message.getStratum().getOrdinal() & 0xFF ) ); |
| byteBuffer.put( ( byte ) ( message.getPollInterval() & 0xFF ) ); |
| byteBuffer.put( ( byte ) ( message.getPrecision() & 0xFF ) ); |
| |
| byteBuffer.putInt( message.getRootDelay() ); |
| byteBuffer.putInt( message.getRootDispersion() ); |
| |
| encodeReferenceIdentifier( message.getReferenceIdentifier(), byteBuffer ); |
| |
| message.getReferenceTimestamp().writeTo( byteBuffer ); |
| message.getOriginateTimestamp().writeTo( byteBuffer ); |
| message.getReceiveTimestamp().writeTo( byteBuffer ); |
| message.getTransmitTimestamp().writeTo( byteBuffer ); |
| } |
| |
| |
| private byte encodeLeapIndicator( LeapIndicatorType leapIndicator, byte header ) |
| { |
| byte twoBits = ( byte ) ( leapIndicator.getOrdinal() & 0x03 ); |
| return ( byte ) ( ( twoBits << 6 ) | header ); |
| } |
| |
| |
| private byte encodeVersionNumber( int versionNumber, byte header ) |
| { |
| byte threeBits = ( byte ) ( versionNumber & 0x07 ); |
| return ( byte ) ( ( threeBits << 3 ) | header ); |
| } |
| |
| |
| private byte encodeMode( ModeType mode, byte header ) |
| { |
| byte threeBits = ( byte ) ( mode.getOrdinal() & 0x07 ); |
| return ( byte ) ( threeBits | header ); |
| } |
| |
| |
| private void encodeReferenceIdentifier( ReferenceIdentifier identifier, ByteBuffer byteBuffer ) |
| { |
| char[] characters = identifier.getCode().toCharArray(); |
| |
| for ( int ii = 0; ii < characters.length; ii++ ) |
| { |
| byteBuffer.put( ( byte ) characters[ii] ); |
| } |
| } |
| } |