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https://issues.apache.org/jira/browse/LUCENE-835?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Harwood updated LUCENE-835:
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Attachment: TestSynonymIndexReader.java
> An IndexReader with run-time support for synonyms
> -------------------------------------------------
>
> Key: LUCENE-835
> URL: https://issues.apache.org/jira/browse/LUCENE-835
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Index
> Affects Versions: 2.1
> Reporter: Mark Harwood
> Assigned To: Mark Harwood
> Attachments: Synonym.java, SynonymIndexReader.java, SynonymSet.java,
> TestSynonymIndexReader.java
>
>
> These classes provide support for enabling the use of synonyms for terms in
> an existing index.
> While Analyzers can be used at Query-parse time or Index-time to inject
> synonyms these are not always satisfactory means of providing support for
> synonyms:
> * Index-time injection of synonyms is less flexible because changing the
> lists of synonyms requires an index rebuild.
> * Query-parse-time injection is awkward because special support is required
> in the parser/query logic to recognise and cater for the tokens that appear
> in the same position. Additionally, any statistical analysis of the index
> content via TermEnum/TermDocs etc does not consider the synonyms unless
> specific code is added.
> What is perhaps more useful is a transparent wrapper for the IndexReader that
> provides a synonym-ized view of the index without requiring specialised
> support in the calling code. All of the TermEnum/TermDocs interfaces remain
> the same but behind the scenes synonyms are being considered/applied silently.
> The classes supplied here provide this "virtual" view of the index and all
> queries or other code that examines this index using the special reader
> benefit from this view without requiring specialized code. A Junit test
> illustrates this code in action.
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