AbstractCheck whether or not this block as a following block
ProtectedleafGets a reference to the block at the end of the chain
A reference to the next query block or null if this block is the last
Sets the reference to the next query block
The soon to be next query block
A reference to the previous query block if this block is the first
Sets the reference to the previous query block
The soon to be previous query block
ProtectedrootGets a reference to the block at the start of the chain
Base behavior for a query block