oracle.javatools.editor.language

Class LexerOffsetsCache

java.lang.Object

oracle.javatools.editor.language.LexerOffsetsCache

Direct Known Subclasses:

LexerDocumentRenderer.DefaultLexerOffsetsCache

public abstract class LexerOffsetsCache
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
LexerOffsetsCache(LexerDocumentRenderer documentRenderer) Constructs a new LexerOffsetsCache for the given style provider.

Method Summary

Modifier and Type	Method and Description
int	findClosestOffset(Lexer lexer, LexerToken lexerToken, int offset) Find the closest offset in the buffer we can start scanning from that occurs at or before the indicated offset.
protected abstract int	findClosestOffsetInternal(Lexer lexer, LexerToken lexerToken, int offset) Internal implementation of findClosestOffset() that does the real work.
protected LexerDocumentRenderer	getDocumentRenderer()
void	invalidateOffsets(int startOffset) Invalidates all offsets larger than or equal to the given offset.
protected abstract void	invalidateOffsetsInternal(int startOffset)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LexerOffsetsCache

public LexerOffsetsCache(LexerDocumentRenderer documentRenderer)

Constructs a new LexerOffsetsCache for the given style provider.

Parameters:

documentRenderer - the document renderer which mantains this cache

Method Detail

findClosestOffset

public final int findClosestOffset(Lexer lexer,
                                   LexerToken lexerToken,
                                   int offset)

Find the closest offset in the buffer we can start scanning from that occurs at or before the indicated offset. Note that this currently returns the closest "reasonable" offset based on some multi-line token guesses. It is not guaranteed to be the closest possible offset.

Parameters:

lexer - the (scratch) lexer to use

lexerToken - the lexer token to use

offset - the maximum offset to find

Returns:

the largest offset <= startOffset

invalidateOffsets

public final void invalidateOffsets(int startOffset)

Invalidates all offsets larger than or equal to the given offset.

Parameters:

startOffset - minimum offset to remove from the cache

findClosestOffsetInternal

protected abstract int findClosestOffsetInternal(Lexer lexer,
                                                 LexerToken lexerToken,
                                                 int offset)

Internal implementation of findClosestOffset() that does the real work.

Parameters:

lexer - the (scratch) lexer to use

lexerToken - the lexer token to use

offset - the maximum offset to find

Returns:

the largest offset <= startOffset

invalidateOffsetsInternal

protected abstract void invalidateOffsetsInternal(int startOffset)

getDocumentRenderer

protected final LexerDocumentRenderer getDocumentRenderer()