org.apache.lucene.analysis.path
Class ReversePathHierarchyTokenizer

java.lang.Object
  extended by org.apache.lucene.util.AttributeSource
      extended by org.apache.lucene.analysis.TokenStream
          extended by org.apache.lucene.analysis.Tokenizer
              extended by org.apache.lucene.analysis.path.ReversePathHierarchyTokenizer
All Implemented Interfaces:
Closeable

public class ReversePathHierarchyTokenizer
extends Tokenizer

Tokenizer for domain-like hierarchies.

Take something like:

 www.site.co.uk
 
and make:
 www.site.co.uk
 site.co.uk
 co.uk
 uk
 


Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource
AttributeSource.AttributeFactory, AttributeSource.State
 
Field Summary
static char DEFAULT_DELIMITER
           
static int DEFAULT_SKIP
           
 
Fields inherited from class org.apache.lucene.analysis.Tokenizer
input
 
Constructor Summary
ReversePathHierarchyTokenizer(Reader input)
           
ReversePathHierarchyTokenizer(Reader input, char delimiter, char replacement)
           
ReversePathHierarchyTokenizer(Reader input, char delimiter, char replacement, int skip)
           
ReversePathHierarchyTokenizer(Reader input, char delimiter, int skip)
           
ReversePathHierarchyTokenizer(Reader input, int skip)
           
ReversePathHierarchyTokenizer(Reader input, int bufferSize, char delimiter)
           
ReversePathHierarchyTokenizer(Reader input, int bufferSize, char delimiter, char replacement)
           
ReversePathHierarchyTokenizer(Reader input, int bufferSize, char delimiter, char replacement, int skip)
           
 
Method Summary
 void end()
          This method is called by the consumer after the last token has been consumed, after TokenStream.incrementToken() returned false (using the new TokenStream API).
 boolean incrementToken()
          Consumers (i.e., IndexWriter) use this method to advance the stream to the next token.
 void reset(Reader input)
          Expert: Reset the tokenizer to a new reader.
 
Methods inherited from class org.apache.lucene.analysis.Tokenizer
close, correctOffset
 
Methods inherited from class org.apache.lucene.analysis.TokenStream
reset
 
Methods inherited from class org.apache.lucene.util.AttributeSource
addAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, copyTo, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, restoreState, toString
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

DEFAULT_DELIMITER

public static final char DEFAULT_DELIMITER
See Also:
Constant Field Values

DEFAULT_SKIP

public static final int DEFAULT_SKIP
See Also:
Constant Field Values
Constructor Detail

ReversePathHierarchyTokenizer

public ReversePathHierarchyTokenizer(Reader input)

ReversePathHierarchyTokenizer

public ReversePathHierarchyTokenizer(Reader input,
                                     int skip)

ReversePathHierarchyTokenizer

public ReversePathHierarchyTokenizer(Reader input,
                                     int bufferSize,
                                     char delimiter)

ReversePathHierarchyTokenizer

public ReversePathHierarchyTokenizer(Reader input,
                                     char delimiter,
                                     char replacement)

ReversePathHierarchyTokenizer

public ReversePathHierarchyTokenizer(Reader input,
                                     int bufferSize,
                                     char delimiter,
                                     char replacement)

ReversePathHierarchyTokenizer

public ReversePathHierarchyTokenizer(Reader input,
                                     char delimiter,
                                     int skip)

ReversePathHierarchyTokenizer

public ReversePathHierarchyTokenizer(Reader input,
                                     char delimiter,
                                     char replacement,
                                     int skip)

ReversePathHierarchyTokenizer

public ReversePathHierarchyTokenizer(Reader input,
                                     int bufferSize,
                                     char delimiter,
                                     char replacement,
                                     int skip)
Method Detail

incrementToken

public final boolean incrementToken()
                             throws IOException
Description copied from class: TokenStream
Consumers (i.e., IndexWriter) use this method to advance the stream to the next token. Implementing classes must implement this method and update the appropriate AttributeImpls with the attributes of the next token.

The producer must make no assumptions about the attributes after the method has been returned: the caller may arbitrarily change it. If the producer needs to preserve the state for subsequent calls, it can use AttributeSource.captureState() to create a copy of the current attribute state.

This method is called for every token of a document, so an efficient implementation is crucial for good performance. To avoid calls to AttributeSource.addAttribute(Class) and AttributeSource.getAttribute(Class), references to all AttributeImpls that this stream uses should be retrieved during instantiation.

To ensure that filters and consumers know which attributes are available, the attributes must be added during instantiation. Filters and consumers are not required to check for availability of attributes in TokenStream.incrementToken().

Specified by:
incrementToken in class TokenStream
Returns:
false for end of stream; true otherwise
Throws:
IOException

end

public final void end()
Description copied from class: TokenStream
This method is called by the consumer after the last token has been consumed, after TokenStream.incrementToken() returned false (using the new TokenStream API). Streams implementing the old API should upgrade to use this feature.

This method can be used to perform any end-of-stream operations, such as setting the final offset of a stream. The final offset of a stream might differ from the offset of the last token eg in case one or more whitespaces followed after the last token, but a WhitespaceTokenizer was used.

Overrides:
end in class TokenStream

reset

public void reset(Reader input)
           throws IOException
Description copied from class: Tokenizer
Expert: Reset the tokenizer to a new reader. Typically, an analyzer (in its reusableTokenStream method) will use this to re-use a previously created tokenizer.

Overrides:
reset in class Tokenizer
Throws:
IOException