Set<Block> getAdjacentBlocks(Set<BlockFace> blockFaces) convenience method in Block.

Often, one wants to get various surrounding blocks of a block, which requires the quite verbose construct of a set of BlockFaces, a for loop over them with getRelative(BlockFace) and then a isEmpty() check on each block to see if it is just air.

A getAdjacentBlocks() method could improve code clarity quite a lot in this case.

// Actual counting example with predefined faces from my plugin:
return faces.stream()
            .map(block::getRelative)
            // Actual block there, not air.
            .filter(b -> !b.isEmpty())
            .count();

// vs
return block.getAdjacentBlocks(faces).size();