content: /*
   * 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.camel.component.hl7;
  
  import ca.uhn.hl7v2.model.Message;
  import org.apache.mina.core.buffer.IoBuffer;
  import org.apache.mina.core.session.IoSession;
  import org.apache.mina.filter.codec.ProtocolEncoder;
  import org.apache.mina.filter.codec.ProtocolEncoderOutput;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * HL7 MLLP encoder
   */
  class HL7MLLPEncoder implements ProtocolEncoder {
  
      private static final Logger LOG = LoggerFactory.getLogger(HL7MLLPEncoder.class);
  
      private HL7MLLPConfig config;
  
      HL7MLLPEncoder(HL7MLLPConfig config) {
          this.config = config;
      }
  
      @Override
      public void dispose(IoSession session) throws Exception {
      }
  
      @Override
      public void encode(IoSession session, Object message, ProtocolEncoderOutput out) throws Exception {
          if (message == null) {
              throw new IllegalArgumentException("Message to be encoded is null");
          } else if (message instanceof Exception) {
              // we cannot handle exceptions
              throw (Exception) message;
          }
  
          byte[] body;
          if (message instanceof Message) {
              body = ((Message) message).encode().getBytes(config.getCharset());
          } else if (message instanceof String) {
              body = ((String) message).getBytes(config.getCharset());
          } else if (message instanceof byte[]) {
              body = (byte[]) message;
          } else {
              throw new IllegalArgumentException(
                      "The message to encode is not a supported type: "
                                                 + message.getClass().getCanonicalName());
          }
  
          // put the data into the byte buffer
          IoBuffer buf = IoBuffer.allocate(body.length + 3).setAutoExpand(true);
          buf.put((byte) config.getStartByte());
          buf.put(body);
          buf.put((byte) config.getEndByte1());
          buf.put((byte) config.getEndByte2());
  
          // flip the buffer so we can use it to write to the out stream
          buf.flip();
          LOG.debug("Encoded HL7 from {} to byte stream", message.getClass().getCanonicalName());
          out.write(buf);
      }
  
  }
  