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package org.uic.barcode.staticFrame;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Arrays;
import org.uic.barcode.ticket.EncodingFormatException;
/**
* The Class DataRecord implements the basic decoding and encoding
* of the data record structure, the split into tag, version, length and content.
*
* Implementing classes must provide decoding and encoding of the content
*
*/
public abstract class DataRecord {
/** The id tag. */
protected String idTag;
/** The version id. */
protected String versionId;
/** The content. */
protected byte[] content;
/**
* Instantiates a new data record.
*
* @param idTag the id tag
* @param version the version
*/
public DataRecord (String idTag, String version) {
this.idTag = idTag;
this.versionId = version;
}
/**
* Instantiates a new data record.
*
* @param idTag the id tag
*/
public DataRecord (String idTag) {
this.idTag = idTag;
}
/**
* Encode.
*
* @return the byte[]
* @throws IOException Signals that an I/O exception has occurred.
* @throws EncodingFormatException the encoding format exception
*/
public byte[] encode() throws IOException, EncodingFormatException {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
encodeContent();
//size of tag + version + length
int length = 12;
//size of data
length = length + content.length;
String lengthElement = String.format("%04d",length);
while (idTag.length() < 6) {
idTag = idTag + " ";
}
while (versionId.length() < 2) {
versionId = "0" + versionId;
}
outputStream.write(idTag.getBytes());
outputStream.write(versionId.getBytes());
outputStream.write(lengthElement.getBytes());
outputStream.write(content);
return outputStream.toByteArray();
}
/**
* Decode.
*
* @param byteData the byte data
* @return the int
* @throws IOException Signals that an I/O exception has occurred.
* @throws EncodingFormatException the encoding format exception
*/
public int decode(byte[] byteData) throws IOException, EncodingFormatException {
int offset = 0;
String tag = new String(Arrays.copyOfRange(byteData, offset, offset + 6));
this.setIdTag(tag);
offset = offset + 6;
String version = new String(Arrays.copyOfRange(byteData, offset, offset + 2));
this.setVersionId(version);
offset = offset + 2;
String dataSize = new String(Arrays.copyOfRange(byteData, offset, offset + 4));
offset = offset + 4;
int length = Integer.parseInt(dataSize) - 12;
this.setData(Arrays.copyOfRange(byteData, offset, offset + length));
decodeContent();
return length + 12;
}
/**
* Gets the id tag.
*
* @return the id tag
*/
public String getIdTag() {
return idTag;
}
/**
* Sets the id tag.
*
* @param idTag the new id tag
*/
public void setIdTag(String idTag) {
this.idTag = idTag;
}
/**
* Gets the version id.
*
* @return the version id
*/
public String getVersionId() {
return versionId;
}
/**
* Sets the version id.
*
* @param versionId the new version id
*/
public void setVersionId(String versionId) {
this.versionId = versionId;
}
/**
* Gets the data.
*
* @return the data
* @throws IOException Signals that an I/O exception has occurred.
* @throws EncodingFormatException the encoding format exception
*/
protected byte[] getData() throws IOException, EncodingFormatException {
return content;
}
/**
* Sets the data.
*
* @param data the new data
* @throws IOException Signals that an I/O exception has occurred.
* @throws EncodingFormatException the encoding format exception
*/
protected void setData(byte[] data) throws IOException, EncodingFormatException {
this.content = data;
}
/**
* Decode content.
*
* @throws IOException Signals that an I/O exception has occurred.
* @throws EncodingFormatException the encoding format exception
*/
protected abstract void decodeContent() throws IOException, EncodingFormatException;
/**
* Encode content.
*
* @throws IOException Signals that an I/O exception has occurred.
* @throws EncodingFormatException the encoding format exception
*/
protected abstract void encodeContent() throws IOException, EncodingFormatException;
}
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