org.apache.tomcat.util.log

## Class UserDataHelper

- java.lang.Object
- - org.apache.tomcat.util.log.UserDataHelper

-     public class UserDataHelper
      extends Object

  This helper class assists with the logging associated with invalid input data. A developer may want all instances of invalid input data logged to assist with debugging whereas in production it is likely to be desirable not to log anything for invalid data. The following settings may be used:
  - NOTHING: Log nothing.
  - DEBUG_ALL: Log all problems at DEBUG log level.
  - INFO_THEN_DEBUG: Log first problem at INFO log level and any further issues in the following TBD (configurable) seconds at DEBUG level
  - INFO_ALL: Log all problems at INFO log level.
  By default, INFO_THEN_DEBUG is used with a suppression time of 24 hours. NOTE: This class is not completely thread-safe. When using INFO_THEN_DEBUG it is possible that several INFO messages will be logged before dropping to DEBUG.

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `UserDataHelper.Mode` Log mode for the next log message.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `UserDataHelper(Log log)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `UserDataHelper.Mode` | `getNextMode()` Returns log mode for the next log message, or `null` if the message should not be logged.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### UserDataHelper

          public UserDataHelper(Log log)

  - ### Method Detail

    - #### getNextMode

          public UserDataHelper.Mode getNextMode()

      Returns log mode for the next log message, or `null` if the message should not be logged.

      If `INFO_THEN_DEBUG` configuration option is enabled, this method might change internal state of this object.

      Returns:
        Log mode, or `null`

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