/*
* 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.nifi.processors.standard.relp.frame;
import java.io.ByteArrayOutputStream;
import java.nio.charset.Charset;
/**
* Encodes a RELPFrame into raw bytes using the given charset.
*/
public class RELPEncoder {
private final Charset charset;
public RELPEncoder(final Charset charset) {
this.charset = charset;
}
public Charset getCharset() {
return charset;
}
public byte[] encode(final RELPFrame frame) {
final ByteArrayOutputStream buffer = new ByteArrayOutputStream();
// write transaction number followed by separator
byte[] txnr = String.format("%s", frame.getTxnr()).getBytes(charset);
buffer.write(txnr, 0, txnr.length);
buffer.write(RELPFrame.SEPARATOR);
// write the command followed by separator
byte[] command = frame.getCommand().getBytes(charset);
buffer.write(command, 0, command.length);
buffer.write(RELPFrame.SEPARATOR);
// write the data length
byte[] dataLength = String.format("%s", frame.getDataLength()).getBytes(charset);
buffer.write(dataLength, 0, dataLength.length);
// if data to write then put a separator and write the data
if (frame.getDataLength() > 0) {
buffer.write(RELPFrame.SEPARATOR);
buffer.write(frame.getData(), 0, frame.getDataLength());
}
// write the end of the frame
buffer.write(RELPFrame.DELIMITER);
return buffer.toByteArray();
}
}