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Java Source Code / Java Documentation » Parser » JTopas » de.susebox.jtopas.spi 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


de.susebox.jtopas.spi.SequenceHandler

All known Subclasses:   de.susebox.jtopas.spi.StandardSequenceHandler,  de.susebox.jtopas.impl.SequenceStore,
SequenceHandler
public interface SequenceHandler (Code)

This interface must be implemented by classes that should be used as a special sequence, string and comment start sequence checker for de.susebox.jtopas.Tokenizer implementations.


See Also:   de.susebox.jtopas.Tokenizer
See Also:   de.susebox.jtopas.TokenizerProperties
See Also:   de.susebox.jtopas.spi.DataMapper
author:
   Heiko Blau




Method Summary
public  intgetSequenceMaxLength()
     This method returns the length of the longest special sequence, comment or string prefix that is known to this SequenceHandler.
public  booleanhasSequenceCommentOrString()
     This method can be used by a de.susebox.jtopas.Tokenizer implementation for a fast detection if special sequence checking must be performed at all.
public  TokenizerPropertystartsWithSequenceCommentOrString(DataProvider dataProvider)
     This method checks if a given range of data starts with a special sequence, a comment or a string.



Method Detail
getSequenceMaxLength
public int getSequenceMaxLength()(Code)
This method returns the length of the longest special sequence, comment or string prefix that is known to this SequenceHandler. When calling SequenceHandler.startsWithSequenceCommentOrString , the passed DataProvider parameter will supply at least this number of characters (see DataProvider.getLength ). If less characters are provided, EOF is reached.
The method is an easy approach to the problem of how to provide more data in case a test runs out of characters. The invoking de.susebox.jtopas.Tokenizer (represented by the given DataProvider ) can supply enough data for the SequenceHandler.startsWithSequenceCommentOrString method. the number of characters needed in the worst case to identify a special sequence



hasSequenceCommentOrString
public boolean hasSequenceCommentOrString()(Code)
This method can be used by a de.susebox.jtopas.Tokenizer implementation for a fast detection if special sequence checking must be performed at all. If the method returns false time-consuming preparations can be skipped. true if there actually are pattern that can be testedfor a match, false otherwise.



startsWithSequenceCommentOrString
public TokenizerProperty startsWithSequenceCommentOrString(DataProvider dataProvider) throws TokenizerException, NullPointerException(Code)
This method checks if a given range of data starts with a special sequence, a comment or a string. These three types of token are tested together since both comment and string prefixes are ordinary special sequences. Only the actions preformed after a string or comment has been detected, are different.
The method returns null if no special sequence, comment or string could matches the the leading part of the data range given through the DataProvider .
In cases of strings or comments, the return value contains the description for the introducing character sequence, NOT the whole string or comment. The reading of the rest of the string or comment is done by the calling de.susebox.jtopas.Tokenizer .
Parameters:
  dataProvider - the source to get the data range from a de.susebox.jtopas.TokenizerProperty if a special sequence, comment or string could be detected, null otherwise
throws:
  TokenizerException - generic exception
throws:
  NullPointerException - if no DataProvider is given



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