Package org.apache.lucene.search.suggest

Class DocumentValueSourceDictionary

java.lang.Object

org.apache.lucene.search.suggest.DocumentDictionary

org.apache.lucene.search.suggest.DocumentValueSourceDictionary

All Implemented Interfaces:

Dictionary

public class DocumentValueSourceDictionary
extends DocumentDictionary

Dictionary with terms and optionally payload information taken from stored fields in a Lucene index. Similar to DocumentDictionary, except it obtains the weight of the terms in a document based on a ValueSource.

NOTE:

• The term and (optionally) payload fields have to be stored
• if the term or (optionally) payload fields supplied do not have a value for a document, then the document is rejected by the dictionary

In practice the ValueSource will likely be obtained using the lucene expression module. The following example shows how to create a ValueSource from a simple addition of two fields: Expression expression = JavascriptCompiler.compile("f1 + f2"); SimpleBindings bindings = new SimpleBindings(); bindings.add(new SortField("f1", SortField.Type.LONG)); bindings.add(new SortField("f2", SortField.Type.LONG)); ValueSource valueSource = expression.getValueSource(bindings);

Constructor Summary

Constructors

Constructor	Description
DocumentValueSourceDictionary(IndexReader reader, String field, ValueSource weightsValueSource)	Creates a new dictionary with the contents of the fields named field for the terms and uses the weightsValueSource supplied to determine the score.
DocumentValueSourceDictionary(IndexReader reader, String field, ValueSource weightsValueSource, String payload)	Creates a new dictionary with the contents of the fields named field for the terms, payloadField for the corresponding payloads and uses the weightsValueSource supplied to determine the score.

Method Summary

Modifier and Type	Method	Description
InputIterator	getEntryIterator()	Returns an iterator over all the entries

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

DocumentValueSourceDictionary

public DocumentValueSourceDictionary(IndexReader reader,
 String field,
 ValueSource weightsValueSource,
 String payload)

Creates a new dictionary with the contents of the fields named field for the terms, payloadField for the corresponding payloads and uses the weightsValueSource supplied to determine the score.

DocumentValueSourceDictionary

public DocumentValueSourceDictionary(IndexReader reader,
 String field,
 ValueSource weightsValueSource)

Creates a new dictionary with the contents of the fields named field for the terms and uses the weightsValueSource supplied to determine the score.

Method Details

getEntryIterator

public InputIterator getEntryIterator()
                               throws IOException

Description copied from interface: Dictionary

Returns an iterator over all the entries

Specified by:

getEntryIterator in interface Dictionary

Overrides:

getEntryIterator in class DocumentDictionary

Returns:

Iterator

Throws:

IOException