org.apache.lucene.analysis.payloads
Class DelimitedPayloadTokenFilter

java.lang.Object
  org.apache.lucene.util.AttributeSource
      org.apache.lucene.analysis.TokenStream
          org.apache.lucene.analysis.TokenFilter
              org.apache.lucene.analysis.payloads.DelimitedPayloadTokenFilter

All Implemented Interfaces:

Closeable

public final class DelimitedPayloadTokenFilter
extends TokenFilter

Characters before the delimiter are the "token", those after are the payload.

For example, if the delimiter is '|', then for the string "foo|bar", foo is the token and "bar" is a payload.

Note, you can also include a PayloadEncoder to convert the payload in an appropriate way (from characters to bytes).

Note make sure your Tokenizer doesn't split on the delimiter, or this won't work

See Also:

PayloadEncoder

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource

AttributeSource.AttributeFactory, AttributeSource.State

Field Summary

static char

DEFAULT_DELIMITER

Fields inherited from class org.apache.lucene.analysis.TokenFilter

input

Constructor Summary

DelimitedPayloadTokenFilter(TokenStream input, char delimiter, PayloadEncoder encoder)

Method Summary

boolean

incrementToken() Consumers (i.e., IndexWriter) use this method to advance the stream to the next token.

Methods inherited from class org.apache.lucene.analysis.TokenFilter

close, end, 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

Constructor Detail

DelimitedPayloadTokenFilter

public DelimitedPayloadTokenFilter(TokenStream input,
                                   char delimiter,
                                   PayloadEncoder encoder)

Method Detail

incrementToken

public 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