@Override
public ByteBuffer decodeKeyValues(
DataInputStream source, HFileBlockDecodingContext blkDecodingCtx) throws IOException {
if (blkDecodingCtx.getClass() != HFileBlockDefaultDecodingContext.class) {
throw new IOException(
this.getClass().getName()
+ " only accepts "
+ HFileBlockDefaultDecodingContext.class.getName()
+ " as the decoding context.");
}
HFileBlockDefaultDecodingContext decodingCtx =
(HFileBlockDefaultDecodingContext) blkDecodingCtx;
if (decodingCtx.getHFileContext().isIncludesTags()
&& decodingCtx.getHFileContext().isCompressTags()) {
if (decodingCtx.getTagCompressionContext() != null) {
// It will be overhead to create the TagCompressionContext again and again for every block
// decoding.
decodingCtx.getTagCompressionContext().clear();
} else {
try {
TagCompressionContext tagCompressionContext =
new TagCompressionContext(LRUDictionary.class, Byte.MAX_VALUE);
decodingCtx.setTagCompressionContext(tagCompressionContext);
} catch (Exception e) {
throw new IOException("Failed to initialize TagCompressionContext", e);
}
}
}
return internalDecodeKeyValues(source, 0, 0, decodingCtx);
}
public BufferedEncodedSeeker(CellComparator comparator, HFileBlockDecodingContext decodingCtx) {
this.comparator = comparator;
this.decodingCtx = decodingCtx;
if (decodingCtx.getHFileContext().isCompressTags()) {
try {
tagCompressionContext = new TagCompressionContext(LRUDictionary.class, Byte.MAX_VALUE);
} catch (Exception e) {
throw new RuntimeException("Failed to initialize TagCompressionContext", e);
}
}
current = createSeekerState(); // always valid
previous = createSeekerState(); // may not be valid
}
