Package 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, AutoCloseable

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

Fields

Modifier and Type	Field	Description
static final char	DEFAULT_DELIMITER

Constructor Summary

Constructors

Constructor	Description
DelimitedPayloadTokenFilter(TokenStream input, char delimiter, PayloadEncoder encoder)

Method Summary

Modifier and Type	Method	Description
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

getClass, notify, notifyAll, wait, wait, wait

Field Details

DEFAULT_DELIMITER

public static final char DEFAULT_DELIMITER

See Also:

• Constant Field Values

Constructor Details

DelimitedPayloadTokenFilter

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

Method Details

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