public final class CFSA2 extends FSA
BIT_TARGET_NEXT
applicable on all arcs, not necessarily the last one.The encoding of automaton body is as follows.
---- CFSA header Byte Description +-+-+-+-+-+-+-+-+\ 0 | | | | | | | | | +------ '\' +-+-+-+-+-+-+-+-+/ +-+-+-+-+-+-+-+-+\ 1 | | | | | | | | | +------ 'f' +-+-+-+-+-+-+-+-+/ +-+-+-+-+-+-+-+-+\ 2 | | | | | | | | | +------ 's' +-+-+-+-+-+-+-+-+/ +-+-+-+-+-+-+-+-+\ 3 | | | | | | | | | +------ 'a' +-+-+-+-+-+-+-+-+/ +-+-+-+-+-+-+-+-+\ 4 | | | | | | | | | +------ version (fixed 0xc6) +-+-+-+-+-+-+-+-+/ +-+-+-+-+-+-+-+-+\ 5 | | | | | | | | | +----\ +-+-+-+-+-+-+-+-+/ \ flags [MSB first] +-+-+-+-+-+-+-+-+\ / 6 | | | | | | | | | +----/ +-+-+-+-+-+-+-+-+/ +-+-+-+-+-+-+-+-+\ 7 | | | | | | | | | +------ label lookup table size +-+-+-+-+-+-+-+-+/ +-+-+-+-+-+-+-+-+\ 8-32 | | | | | | | | | +------ label value lookup table : : : : : : : : : | +-+-+-+-+-+-+-+-+/ ---- Start of a node; only if automaton was compiled with NUMBERS option. Byte +-+-+-+-+-+-+-+-+\ 0 | | | | | | | | | \ +-+-+-+-+-+-+-+-+ + 1 | | | | | | | | | | number of strings recognized +-+-+-+-+-+-+-+-+ +----- by the automaton starting : : : : : : : : : | from this node. v-coding +-+-+-+-+-+-+-+-+ + | | | | | | | | | / +-+-+-+-+-+-+-+-+/ ---- A vector of this node's arcs. An arc's layout depends on the combination of flags. 1) NEXT bit set, mapped arc label. +----------------------- node pointed to is next | +--------------------- the last arc of the node | | +------------------- this arc leads to a final state (acceptor) | | | _______+--------- arc's label; indexed if M > 0, otherwise explicit label follows | | | / | | | | +-+-+-+-+-+-+-+-+\ 0 |N|L|F|M|M|M|M|M| +------ flags + (M) index of the mapped label. +-+-+-+-+-+-+-+-+/ +-+-+-+-+-+-+-+-+\ 1 | | | | | | | | | +------ optional label if M == 0 +-+-+-+-+-+-+-+-+/ : : : : : : : : : +-+-+-+-+-+-+-+-+\ |A|A|A|A|A|A|A|A| +------ v-coded goto address +-+-+-+-+-+-+-+-+/
Modifier and Type | Field and Description |
---|---|
byte[] |
arcs
An array of bytes with the internal representation of the automaton.
|
static int |
BIT_FINAL_ARC
The arc corresponds to the last character of a sequence
available when building the automaton (acceptor transition).
|
static int |
BIT_LAST_ARC
The arc is the last one from the current node's arcs list.
|
static int |
BIT_TARGET_NEXT
The target node of this arc follows the last arc of the current state
(no goto field).
|
static int |
LABEL_INDEX_SIZE
Maximum size of the labels index.
|
byte[] |
labelMapping
Label mapping for M-indexed labels.
|
static byte |
VERSION
Automaton header version value.
|
Modifier and Type | Method and Description |
---|---|
int |
getArc(int node,
byte label) |
byte |
getArcLabel(int arc) |
int |
getEndNode(int arc) |
int |
getFirstArc(int node) |
Set<FSAFlags> |
getFlags() |
int |
getNextArc(int arc) |
int |
getRightLanguageCount(int node) |
int |
getRootNode() |
boolean |
isArcFinal(int arc) |
boolean |
isArcLast(int arc)
Returns
true if this arc has NEXT bit set. |
boolean |
isArcTerminal(int arc) |
boolean |
isNextSet(int arc) |
getArcCount, getSequences, getSequences, iterator, read, read, readRemaining, visitAllStates, visitInPostOrder, visitInPostOrder, visitInPreOrder, visitInPreOrder
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
forEach, spliterator
public static final byte VERSION
public static final int BIT_TARGET_NEXT
public static final int BIT_LAST_ARC
public static final int BIT_FINAL_ARC
public static final int LABEL_INDEX_SIZE
public byte[] arcs
public final byte[] labelMapping
public int getRootNode()
getRootNode
in class FSA
public final int getFirstArc(int node)
getFirstArc
in class FSA
node
- Identifier of the node.node
or 0 if the node has no outgoing arcs.public final int getNextArc(int arc)
getNextArc
in class FSA
arc
- The arc's identifier.arc
and
leaving node
. Zero is returned if no more arcs are
available for the node.public int getArc(int node, byte label)
public int getEndNode(int arc)
getEndNode
in class FSA
arc
- The arc's identifier.arc
.
Terminal arcs (those that point to a terminal state) have no end
node representation and throw a runtime exception.public byte getArcLabel(int arc)
getArcLabel
in class FSA
arc
- The arc's identifier.arc
.public int getRightLanguageCount(int node)
getRightLanguageCount
in class FSA
node
- Identifier of the node.FSAFlags.NUMBERS
. The size
of the right language of the state, in other words.public boolean isArcFinal(int arc)
isArcFinal
in class FSA
arc
- The arc's identifier.true
if the destination node at the end of
this arc
corresponds to an input sequence created when
building this automaton.public boolean isArcTerminal(int arc)
isArcTerminal
in class FSA
arc
- The arc's identifier.true
if this arc
does not have a
terminating node (@link FSA.getEndNode(int)
will throw an
exception). Implies FSA.isArcFinal(int)
.public boolean isArcLast(int arc)
true
if this arc has NEXT
bit set.arc
- The node's arc identifier.BIT_LAST_ARC
public boolean isNextSet(int arc)
arc
- The node's arc identifier.BIT_TARGET_NEXT
is set for this arc.BIT_TARGET_NEXT
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