/**
* Convert an MVD to a string
*
* @param mvd the MVD to convert
* @param rb database properties file
* @param folderId id of the folder to contain it in
* @throws Exception raised if an error occurred
*/
public static String externalise(MVD mvd) throws Exception {
int size = mvd.dataSize();
byte[] data = new byte[size];
int nBytes = mvd.serialise(data);
assert nBytes == size : "MVD shorter than predicted";
return Base64.encodeBytes(data, Base64.GZIP);
}
/**
* Save an MVD to a file
*
* @param mvd the MVD to save
* @param dst the file to save it to
* @param rb database properties file
* @param folderId id of the folder to contain it in
* @throws Exception raised if an error occurred
*/
public static void externalise(MVD mvd, File dst, int folderId, Properties rb) throws Exception {
long start = System.nanoTime() / 1000;
System.gc();
long startMem = Runtime.getRuntime().freeMemory();
int size = mvd.dataSize();
byte[] data = new byte[size];
int nBytes = mvd.serialise(data);
assert nBytes == size : "MVD shorter than predicted";
String str = Base64.encodeBytes(data, Base64.GZIP);
if (rb == null) writeToFile(dst, str);
else writeToDatabase(dst.getName(), str, mvd.description, folderId, rb);
long end = System.nanoTime() / 1000;
long endMem = Runtime.getRuntime().freeMemory();
System.out.println("internalise took " + (end - start) + " microseconds");
System.out.println("Memory used " + (startMem - endMem) + " bytes");
}
/**
* Decode the base-64 encoded text into a byte array, check the magic string at the start of the
* file, and decompress it.
*
* @param base64Data the base64 data to decode
* @return the byte array containing the decoded data.
* @throws an exception if it is not an MVD file
*/
private static byte[] base64Decode(String base64Data) throws Exception {
byte[] data = Base64.decode(base64Data);
if (!magicOK(data)) throw new MVDException("Not a valid MVD file");
return data;
}
