/**
* Allocates file space for the row.
*
* <p>A Row is added by walking the list of CacheFree objects to see if there is available space
* to store it, reusing space if it exists. Otherwise the file is grown to accommodate it.
*/
private int setFilePos(CachedObject r) throws IOException {
int rowSize = r.getStorageSize();
int i = freeBlocks == null ? -1 : freeBlocks.get(rowSize);
if (i == -1) {
i = (int) (fileFreePosition / cacheFileScale);
long newFreePosition = fileFreePosition + rowSize;
if (newFreePosition > maxDataFileSize) {
throw new IOException(Trace.getMessage(Trace.DATA_FILE_IS_FULL));
}
fileFreePosition = newFreePosition;
}
r.setPos(i);
return i;
}
public synchronized CachedObject get(int i, PersistentStore store, boolean keep)
throws HsqlException {
if (i < 0) {
return null;
}
try {
CachedObject value = cache.get(i);
if (value == null) {
boolean result = readObject(i);
if (!result) {
return null;
}
value = store.get(rowIn);
value.setPos(i);
cache.put(i, value);
}
if (keep) {
value.keepInMemory(true);
}
return value;
} catch (IOException e) {
database.logger.appLog.logContext("" + cache + " pos: " + i);
database.logger.appLog.logContext(e);
throw Trace.error(
Trace.DATA_FILE_ERROR, Trace.DataFileCache_makeRow, new Object[] {e, fileName});
}
}