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).
|
byte[] |
labelMapping
Label mapping for M-indexed labels.
|
static byte |
VERSION
Automaton header version value.
|
Constructor and Description |
---|
CFSA2(InputStream in)
Reads an automaton from a byte stream.
|
Modifier and Type | Method and Description |
---|---|
int |
getArc(int node,
byte label) |
byte |
getArcLabel(int arc)
Return the label associated with a given
arc . |
int |
getEndNode(int arc)
Return the end node pointed to by a given
arc . |
int |
getFirstArc(int node) |
Set<FSAFlags> |
getFlags()
Returns a set of flags for this FSA instance.
|
int |
getNextArc(int arc) |
int |
getRightLanguageCount(int node) |
int |
getRootNode() |
boolean |
isArcFinal(int arc)
Returns
true if the destination node at the end of this
arc corresponds to an input sequence created when building
this automaton. |
boolean |
isArcLast(int arc)
Returns
true if this arc has NEXT bit set. |
boolean |
isArcTerminal(int arc)
Returns
true if this arc does not have a
terminating node (@link FSA.getEndNode(int) will throw an
exception). |
boolean |
isNextSet(int arc) |
getArcCount, getSequences, getSequences, iterator, read, read, 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 byte[] arcs
public final byte[] labelMapping
public CFSA2(InputStream in) throws IOException
IOException
public int getRootNode()
getRootNode
in class FSA
public final int getFirstArc(int node)
getFirstArc
in class FSA
node
or 0 if the node has no outgoing arcs.public final int getNextArc(int arc)
getNextArc
in class FSA
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)
arc
. Terminal arcs
(those that point to a terminal state) have no end node representation
and throw a runtime exception.getEndNode
in class FSA
public byte getArcLabel(int arc)
arc
.getArcLabel
in class FSA
public int getRightLanguageCount(int node)
getRightLanguageCount
in class FSA
FSAFlags.NUMBERS
. The size of
the right language of the state, in other words.public boolean isArcFinal(int arc)
true
if the destination node at the end of this
arc
corresponds to an input sequence created when building
this automaton.isArcFinal
in class FSA
public boolean isArcTerminal(int arc)
true
if this arc
does not have a
terminating node (@link FSA.getEndNode(int)
will throw an
exception). Implies FSA.isArcFinal(int)
.isArcTerminal
in class FSA
public boolean isArcLast(int arc)
true
if this arc has NEXT
bit set.BIT_LAST_ARC
public boolean isNextSet(int arc)
BIT_TARGET_NEXT
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