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Java Source Code / Java Documentation » Database ORM » toplink » persistence.antlr

Source Cross Reference

Class Diagram

Java Document (Java Doc)

java.lang .Object

persistence.antlr .InputBuffer

All known Subclasses:   persistence.antlr.debug .DebuggingInputBuffer,  persistence.antlr .CharBuffer,  persistence.antlr .ByteBuffer,
InputBuffer
abstract public class InputBuffer (Code)
A Stream of characters fed to the lexer from a InputStream that can be rewound via mark()/rewind() methods.
A dynamic array is used to buffer up all the input characters. Normally, "k" characters are stored in the buffer. More characters may be stored during guess mode (testing syntactic predicate), or when LT(i>k) is referenced. Consumption of characters is deferred. In other words, reading the next character is not done by conume(), but deferred until needed by LA or LT.

See Also:   persistence.antlr.CharQueue

Field Summary
protected int markerOffset

protected int nMarkers

protected int numToConsume

protected CharQueue queue


Constructor Summary
public InputBuffer()


Method Summary
public char LA(int i)

public void commit()
     This method updates the state of the input buffer so that the text matched since the most recent mark() is no longer held by the buffer.
public void consume()

abstract public void fill(int amount)

public String getLAChars()

public String getMarkedChars()

public boolean isMarked()

public int mark()
     Return an integer marker that can be used to rewind the buffer to its current state.
public void reset()

public void rewind(int mark)
     Rewind the character buffer to a marker.
protected void syncConsume()


Field Detail
markerOffset
protected int markerOffset(Code)

nMarkers
protected int nMarkers(Code)

numToConsume
protected int numToConsume(Code)

queue
protected CharQueue queue(Code)

Constructor Detail
InputBuffer
public InputBuffer()(Code)
Create an input buffer

Method Detail
LA
public char LA(int i) throws CharStreamException(Code)
Get a lookahead character

commit
public void commit()(Code)
This method updates the state of the input buffer so that the text matched since the most recent mark() is no longer held by the buffer. So, you either do a mark/rewind for failed predicate or mark/commit to keep on parsing without rewinding the input.

consume
public void consume()(Code)
Mark another character for deferred consumption

fill
abstract public void fill(int amount) throws CharStreamException(Code)
Ensure that the input buffer is sufficiently full

getLAChars
public String getLAChars()(Code)

getMarkedChars
public String getMarkedChars()(Code)

isMarked
public boolean isMarked()(Code)

mark
public int mark()(Code)
Return an integer marker that can be used to rewind the buffer to its current state.

reset
public void reset()(Code)
Reset the input buffer

rewind
public void rewind(int mark)(Code)
Rewind the character buffer to a marker.
Parameters:
  mark - Marker returned previously from mark()

syncConsume
protected void syncConsume()(Code)
Sync up deferred consumption

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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