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TCP client for KSI Java SDK

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/*
 * Copyright 2013-2016 Guardtime, Inc.
 *
 * This file is part of the Guardtime client SDK.
 *
 * 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, CONDITIONS, OR OTHER LICENSES OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 * "Guardtime" and "KSI" are trademarks or registered trademarks of
 * Guardtime, Inc., and no license to trademarks is granted; Guardtime
 * reserves and retains all trademark rights.
 */
package com.guardtime.ksi.service.tcp;

import org.apache.mina.core.buffer.IoBuffer;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.filter.codec.ProtocolEncoderAdapter;
import org.apache.mina.filter.codec.ProtocolEncoderOutput;

import java.io.ByteArrayOutputStream;

/**
 * Encodes the Transaction to TCP raw request.
 */
class TransactionEncoder extends ProtocolEncoderAdapter {

    public void encode(IoSession session, Object message, ProtocolEncoderOutput out) throws Exception {
        KSITCPSigningTransaction transaction = (KSITCPSigningTransaction) message;
        ByteArrayOutputStream requestBytesStream = new ByteArrayOutputStream();
        transaction.getRequest().writeTo(requestBytesStream);
        byte[] requestBytes = requestBytesStream.toByteArray();
        IoBuffer buffer = IoBuffer.allocate(requestBytes.length).setAutoExpand(true);
        buffer.put(requestBytes);
        buffer.flip();
        out.write(buffer);
    }
}