public static CompressedLongsIndexedSupplier fromByteBuffer(ByteBuffer buffer, ByteOrder order) {
byte versionFromBuffer = buffer.get();
if (versionFromBuffer == version) {
final int totalSize = buffer.getInt();
final int sizePer = buffer.getInt();
final CompressedObjectStrategy.CompressionStrategy compression =
CompressedObjectStrategy.CompressionStrategy.forId(buffer.get());
return new CompressedLongsIndexedSupplier(
totalSize,
sizePer,
GenericIndexed.read(
buffer,
CompressedLongBufferObjectStrategy.getBufferForOrder(order, compression, sizePer)),
compression);
} else if (versionFromBuffer == LZF_VERSION) {
final int totalSize = buffer.getInt();
final int sizePer = buffer.getInt();
final CompressedObjectStrategy.CompressionStrategy compression =
CompressedObjectStrategy.CompressionStrategy.LZF;
return new CompressedLongsIndexedSupplier(
totalSize,
sizePer,
GenericIndexed.read(
buffer,
CompressedLongBufferObjectStrategy.getBufferForOrder(order, compression, sizePer)),
compression);
}
throw new IAE("Unknown version[%s]", versionFromBuffer);
}
public CompressedLongsIndexedSupplier convertByteOrder(ByteOrder order) {
return new CompressedLongsIndexedSupplier(
totalSize,
sizePer,
GenericIndexed.fromIterable(
baseLongBuffers,
CompressedLongBufferObjectStrategy.getBufferForOrder(order, compression, sizePer)),
compression);
}
public static CompressedLongsIndexedSupplier fromList(
final List<Long> list,
final int chunkFactor,
final ByteOrder byteOrder,
CompressedObjectStrategy.CompressionStrategy compression) {
Preconditions.checkArgument(
chunkFactor <= MAX_LONGS_IN_BUFFER,
"Chunks must be <= 64k bytes. chunkFactor was[%s]",
chunkFactor);
return new CompressedLongsIndexedSupplier(
list.size(),
chunkFactor,
GenericIndexed.fromIterable(
new Iterable<ResourceHolder<LongBuffer>>() {
@Override
public Iterator<ResourceHolder<LongBuffer>> iterator() {
return new Iterator<ResourceHolder<LongBuffer>>() {
int position = 0;
@Override
public boolean hasNext() {
return position < list.size();
}
@Override
public ResourceHolder<LongBuffer> next() {
LongBuffer retVal = LongBuffer.allocate(chunkFactor);
if (chunkFactor > list.size() - position) {
retVal.limit(list.size() - position);
}
final List<Long> longs = list.subList(position, position + retVal.remaining());
for (long value : longs) {
retVal.put(value);
}
retVal.rewind();
position += retVal.remaining();
return StupidResourceHolder.create(retVal);
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
};
}
},
CompressedLongBufferObjectStrategy.getBufferForOrder(
byteOrder, compression, chunkFactor)),
compression);
}
public static CompressedLongsIndexedSupplier fromLongBuffer(
final LongBuffer buffer,
final int chunkFactor,
final ByteOrder byteOrder,
CompressedObjectStrategy.CompressionStrategy compression) {
Preconditions.checkArgument(
chunkFactor <= MAX_LONGS_IN_BUFFER,
"Chunks must be <= 64k bytes. chunkFactor was[%s]",
chunkFactor);
return new CompressedLongsIndexedSupplier(
buffer.remaining(),
chunkFactor,
GenericIndexed.fromIterable(
new Iterable<ResourceHolder<LongBuffer>>() {
@Override
public Iterator<ResourceHolder<LongBuffer>> iterator() {
return new Iterator<ResourceHolder<LongBuffer>>() {
LongBuffer myBuffer = buffer.asReadOnlyBuffer();
@Override
public boolean hasNext() {
return myBuffer.hasRemaining();
}
@Override
public ResourceHolder<LongBuffer> next() {
LongBuffer retVal = myBuffer.asReadOnlyBuffer();
if (chunkFactor < myBuffer.remaining()) {
retVal.limit(retVal.position() + chunkFactor);
}
myBuffer.position(myBuffer.position() + retVal.remaining());
return StupidResourceHolder.create(retVal);
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
};
}
},
CompressedLongBufferObjectStrategy.getBufferForOrder(
byteOrder, compression, chunkFactor)),
compression);
}
