public BSkipList makeIndex(String name, Serializer key, Serializer val) throws IOException {
if (metaIndex.get(name) != null) {
throw new IOException("Index already exists");
}
int page = allocPage();
metaIndex.put(name, Integer.valueOf(page));
BSkipList.init(this, page, spanSize);
BSkipList bsl = new BSkipList(spanSize, this, page, key, val, true);
openIndices.put(name, bsl);
return bsl;
}
/** Use this constructor with a readonly RAI and init = false for a readonly blockfile */
public BlockFile(RandomAccessInterface rai, boolean init) throws IOException {
if (rai == null) {
throw new NullPointerException();
}
file = rai;
if (init) {
file.setLength(fileLen);
writeSuperBlock();
BSkipList.init(this, METAINDEX_PAGE, spanSize);
}
readSuperBlock();
if (magicBytes != MAGIC) {
if ((magicBytes & MAGIC_BASE) == MAGIC_BASE) {
throw new IOException(
"Expected "
+ MAJOR
+ '.'
+ MINOR
+ " but got "
+ (magicBytes >> 8 & 0xff)
+ '.'
+ (magicBytes & 0xff));
} else {
throw new IOException("Bad magic number");
}
}
_wasMounted = mounted != 0;
if (_wasMounted) log.warn("Warning - file was not previously closed");
if (fileLen != file.length())
throw new IOException("Expected file length " + fileLen + " but actually " + file.length());
if (rai.canWrite()) mount();
metaIndex = new BSkipList(spanSize, this, METAINDEX_PAGE, new StringBytes(), new IntBytes());
}