Package com.norconex.importer.handler.tagger.impl

Class KeepOnlyTagger

  • All Implemented Interfaces:
    IXMLConfigurable, IImporterHandler, IDocumentTagger
    public class KeepOnlyTagger
extends AbstractDocumentTagger

    Keep only the metadata fields provided, delete all other ones. Exact field names (case-insensitive) to keep can be provided as well as a regular expression that matches one or many fields (since 2.1.0).

    Note: Unless you have good reasons for doing otherwise, it is recommended to use this handler as one of the last ones to be executed. This is a good practice to ensure all metadata fields are available to other handlers that may require them even if they are not otherwise required.

    Can be used both as a pre-parse or post-parse handler.

    XML configuration usage:

    
<handler
    class="com.norconex.importer.handler.tagger.impl.KeepOnlyTagger">
  <!-- multiple "restrictTo" tags allowed (only one needs to match) -->
  <restrictTo>
    <fieldMatcher>(field-matching expression)</fieldMatcher>
    <valueMatcher>(value-matching expression)</valueMatcher>
  </restrictTo>
  <fieldMatcher>(one or more matching fields to keep)</fieldMatcher>
</handler>

    XML usage example:

    
<handler
    class="KeepOnlyTagger">
  <fieldMatcher
      method="regex">
    (title|description)
  </fieldMatcher>
</handler>

    The above example keeps only the title and description fields from all extracted fields.

    Author:
    Pascal Essiembre
    See Also:
    Pattern