SequenceValidator (Apache OpenNLP Tools 1.9.5 API)
Date: 2026-06-18

opennlp.tools.util

## Interface SequenceValidator<T>

- All Known Implementing Classes:
    BilouNameFinderSequenceValidator, DefaultChunkerSequenceValidator, DefaultLemmatizerSequenceValidator, DefaultPOSSequenceValidator, NameFinderSequenceValidator, ParserChunkerSequenceValidator

      public interface SequenceValidator<T>

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `validSequence(int i, T[] inputSequence, String[] outcomesSequence, String outcome)` Determines whether a particular continuation of a sequence is valid.

- - ### Method Detail

    - #### validSequence

          boolean validSequence(int i,
                                T[] inputSequence,
                                String[] outcomesSequence,
                                String outcome)

      Determines whether a particular continuation of a sequence is valid. This is used to restrict invalid sequences such as those used in start/continue tag-based chunking or could be used to implement tag dictionary restrictions.
      Parameters:
        `i` - The index in the input sequence for which the new outcome is being proposed.
        `inputSequence` - The input sequence.
        `outcomesSequence` - The outcomes so far in this sequence.
        `outcome` - The next proposed outcome for the outcomes sequence.
      Returns:
        true is the sequence would still be valid with the new outcome, false otherwise.

Copyright © 2026 The Apache Software Foundation. All rights reserved.