org.apache.lucene.classification.document

## Interface DocumentClassifier<T>

- All Known Implementing Classes:
    KNearestNeighborDocumentClassifier, SimpleNaiveBayesDocumentClassifier

      public interface DocumentClassifier<T>

  A classifier, see `http://en.wikipedia.org/wiki/Classifier_(mathematics)`, which assign classes of type `T` to a `Document`s
  WARNING: This API is experimental and might change in incompatible ways in the next release.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `ClassificationResult<T>` | `assignClass(Document document)` Assign a class (with score) to the given `Document`
    `List<ClassificationResult<T>>` | `getClasses(Document document)` Get all the classes (sorted by score, descending) assigned to the given `Document`.
    `List<ClassificationResult<T>>` | `getClasses(Document document, int max)` Get the first `max` classes (sorted by score, descending) assigned to the given text String.

- - ### Method Detail

    - #### assignClass

          ClassificationResult<T> assignClass(Document document)
                                       throws IOException

      Assign a class (with score) to the given `Document`
      Parameters:
        `document` - a `Document` to be classified. Fields are considered features for the classification.
      Returns:
        a `ClassificationResult` holding assigned class of type `T` and score
      Throws:
        `IOException` - If there is a low-level I/O error.

    - #### getClasses

          List<ClassificationResult<T>> getClasses(Document document)
                                            throws IOException

      Get all the classes (sorted by score, descending) assigned to the given `Document`.
      Parameters:
        `document` - a `Document` to be classified. Fields are considered features for the classification.
      Returns:
        the whole list of `ClassificationResult`, the classes and scores. Returns `null` if the classifier can't make lists.
      Throws:
        `IOException` - If there is a low-level I/O error.

    - #### getClasses

          List<ClassificationResult<T>> getClasses(Document document,
                                                   int max)
                                            throws IOException

      Get the first `max` classes (sorted by score, descending) assigned to the given text String.
      Parameters:
        `document` - a `Document` to be classified. Fields are considered features for the classification.
        `max` - the number of return list elements
      Returns:
        the whole list of `ClassificationResult`, the classes and scores. Cut for "max" number of elements. Returns `null` if the classifier can't make lists.
      Throws:
        `IOException` - If there is a low-level I/O error.

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