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


java.lang.Object
   de.susebox.jtopas.spi.StandardSequenceHandler

StandardSequenceHandler
public class StandardSequenceHandler implements SequenceHandler(Code)

Simple implementation of the SequenceHandler interface. This class works only with the de.susebox.jtopas.TokenizerProperties interface methods and is aware of changes in these properties. It does not cache any information and is therefore a more or less slow way to handle special sequences.

This class is a bridge between arbitrary de.susebox.jtopas.Tokenizer implementations using the SPI interface SequenceHandler and any de.susebox.jtopas.TokenizerProperties implementation that does not implement the SequenceHandler interface itself.


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



Constructor Summary
public  StandardSequenceHandler(TokenizerProperties props)
     The constructor takes the de.susebox.jtopas.TokenizerProperties that provide the special sequences.

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.


Constructor Detail
StandardSequenceHandler
public StandardSequenceHandler(TokenizerProperties props)(Code)
The constructor takes the de.susebox.jtopas.TokenizerProperties that provide the special sequences.
Parameters:
  props - the de.susebox.jtopas.TokenizerProperties to take the sequences from




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 StandardSequenceHandler.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 StandardSequenceHandler.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 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 .
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:
  NullPointerException - if no DataProvider is given



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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