merkle-db.key — merkle-db/core 0.2.0

Record keys are immutable byte sequences which uniquely identify a record within a table. Keys are stored in sorted order by comparing them lexicographically.

The first byte that differs between two keys determines their sort order, with the lower byte value ranking first. If the prefix of the longer key matches all the bytes in the shorter key, the shorter key ranks first.

after? clj

(after? k x)

Returns true if k is ranked after x.

before? clj

(before? k x)

Returns true if k is ranked before x.

bytes-lexicoder clj

Lexicoder for passing through raw byte arrays.

create clj

(create data)

Construct a new key value containing the given byte data, which should either be a byte array or a sequence of byte values.

decode clj

(decode coder data)

(decode coder data offset len)

Decodes the given key byte data and returns a value.

encode clj

(encode coder value)

Encodes the given value and returns persistent key bytes.

float-lexicoder clj

Lexicoder for double-precision floating point values.

get-bytes clj

(get-bytes k)

Return a copy of the raw bytes inside a key.

hex clj

(hex k)

Return a hexadecimal string encoding the bytes in the key.

instant-lexicoder clj

Lexicoder for instants in time.

integer-lexicoder clj

Lexicoder for long integer values.

key? clj

(key? x)

Predicate which returns true if x is a key value.

lexicoder clj multimethod

Construct a lexicoder from a configuration data structure. The structure should be either a keyword or a vector with the first element a keyword providing the dispatch value.

max clj

(max x)

(max x y)

(max x y & more)

Returns the greatest of the given keys.

min clj

(min x)

(min x y)

(min x y & more)

Returns the least of the given keys.

parse clj

(parse s)

Parse a key from a hexadecimal string.

reverse-lexicoder clj

(reverse-lexicoder coder)

Wraps the given lexicoder to reverse the ordering of keys encoded with it.

sequence-lexicoder clj

(sequence-lexicoder element-coder)

Constructs a lexicoder for homogeneous sequences of elements which will be coded with the given lexicoder.

string-lexicoder clj

Lexicoder for UTF-8 character strings.

string-lexicoder* clj

(string-lexicoder* charset)

Constructs a new string lexicoder with the given charset.

tuple-lexicoder clj

(tuple-lexicoder & coders)

Constructs a lexicoder for a fixed-size tuple of values which will be coded with the given lexicoders, in order.