/**
* @return The index of the first byte contained in this database as a function of the index of
* the first record
*/
protected final long firstByteIndex() {
return myLogic.getByteIndex(firstRecordIndex);
}
/**
* @return The number of bytes contained in this database as a function of the number of records
*/
protected final long numBytes() {
return myLogic.getNumBytes(numRecords);
}
public final long requiredMemory(long numRecords) {
return myLogic.getNumBytes(numRecords);
}
/**
* @param numBytes The number of bytes available
* @return The number of records which can be stored in numBytes bytes
*/
public final long recordsForBytes(long numBytes) {
return myLogic.getNumRecords(numBytes);
}
public long readNextRecord(DatabaseHandle dh) throws IOException {
readFullBytes(dh, dh.currentRecord, 0, myLogic.recordBytes);
return myLogic.getRecord(dh.currentRecord, 0);
}
public void writeNextRecord(DatabaseHandle dh, long record) throws IOException {
myLogic.fillBytes(record, dh.currentRecord, 0);
writeFullBytes(dh, dh.currentRecord, 0, myLogic.recordBytes);
}
public void prepareWriteRecordRange(DatabaseHandle dh, long recordIndex, long numRecords)
throws IOException {
prepareWriteRange(dh, myLogic.getByteIndex(recordIndex), myLogic.getNumBytes(numRecords));
}
protected void writeRecordFromByteIndex(DatabaseHandle dh, long byteIndex, long record)
throws IOException {
myLogic.fillBytes(record, dh.currentRecord, 0);
writeFullBytes(dh, byteIndex, dh.currentRecord, 0, myLogic.recordBytes);
}
public void writeRecord(DatabaseHandle dh, long recordIndex, long record) throws IOException {
writeRecordFromByteIndex(dh, myLogic.getByteIndex(recordIndex), record);
}
/**
* @param dh The handle to use for reading
* @param byteIndex The byte-index into the file to begin reading at
* @return The hash of the record read at that position
* @throws IOException If an IOException occurs while reading
*/
protected long readRecordFromByteIndex(DatabaseHandle dh, long byteIndex) throws IOException {
readFullBytes(dh, byteIndex, dh.currentRecord, 0, myLogic.recordBytes);
return myLogic.getRecord(dh.currentRecord, 0);
}
/**
* Reads a record at the given hash
*
* @param dh The handle to use for reading
* @param recordIndex The hash of the game state where the record should be read
* @return The hash of the record read at that position
* @throws IOException If an IOException occurs while reading
*/
public long readRecord(DatabaseHandle dh, long recordIndex) throws IOException {
return readRecordFromByteIndex(dh, myLogic.getByteIndex(recordIndex));
}
