com.mongodb.internal.connection.CompressedHeader Maven / Gradle / Ivy
/*
* Copyright 2008-present MongoDB, Inc.
*
* Licensed 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 com.mongodb.internal.connection;
import com.mongodb.MongoInternalException;
import org.bson.ByteBuf;
import static com.mongodb.internal.connection.MessageHeader.MESSAGE_HEADER_LENGTH;
import static com.mongodb.internal.connection.OpCode.OP_COMPRESSED;
import static java.lang.String.format;
// Contains the details of an OP_COMPRESSED reply from a MongoDB server.
class CompressedHeader {
/**
* The length of the reply header in the MongoDB wire protocol.
*/
public static final int COMPRESSED_HEADER_LENGTH = 9;
/**
* The length of the OP_COMPRESSED header plus the length of the standard message header
*/
public static final int TOTAL_COMPRESSED_HEADER_LENGTH = COMPRESSED_HEADER_LENGTH + MESSAGE_HEADER_LENGTH;
private final int originalOpcode;
private final int uncompressedSize;
private final byte compressorId;
private final MessageHeader messageHeader;
CompressedHeader(final ByteBuf header, final MessageHeader messageHeader) {
this.messageHeader = messageHeader;
if (messageHeader.getOpCode() != OP_COMPRESSED.getValue()) {
throw new MongoInternalException(format("The reply message opCode %d does not match the expected opCode %d",
messageHeader.getOpCode(), OP_COMPRESSED.getValue()));
}
if (messageHeader.getMessageLength() < TOTAL_COMPRESSED_HEADER_LENGTH) {
throw new MongoInternalException(format("The reply message length %d is less than the mimimum message length %d",
messageHeader.getMessageLength(), COMPRESSED_HEADER_LENGTH));
}
originalOpcode = header.getInt();
uncompressedSize = header.getInt();
compressorId = header.get();
}
/**
*
* @return the original opcode
*/
public int getOriginalOpcode() {
return originalOpcode;
}
/**
*
* @return the uncompressed size of the wrapped message
*/
public int getUncompressedSize() {
return uncompressedSize;
}
/**
*
* @return the compressor identifier with which the message is compressed
*/
public byte getCompressorId() {
return compressorId;
}
/**
* @return the size of the compressed message.
*/
public int getCompressedSize() {
return messageHeader.getMessageLength() - COMPRESSED_HEADER_LENGTH - MESSAGE_HEADER_LENGTH;
}
public MessageHeader getMessageHeader() {
return messageHeader;
}
}