org.apache.commons.compress.compressors.lz77support

## Class Parameters

- java.lang.Object
- - org.apache.commons.compress.compressors.lz77support.Parameters

-     public final class Parameters
      extends Object

  Parameters of the `compressor`.

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `Parameters.Builder` Builder for `Parameters` instances.

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static int` | `TRUE_MIN_BACK_REFERENCE_LENGTH` The hard-coded absolute minimal length of a back-reference.

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `static Parameters.Builder` | `builder(int windowSize)` Initializes the builder for the compressor's parameters with a `minBackReferenceLength` of 3 and `max*Length` equal to `windowSize - 1`.
    `boolean` | `getLazyMatching()` Gets whether to perform lazy matching.
    `int` | `getLazyMatchingThreshold()` Gets the threshold for lazy matching.
    `int` | `getMaxBackReferenceLength()` Gets the maximal length of a back-reference found.
    `int` | `getMaxCandidates()` Gets the maximum number of back-reference candidates to consider.
    `int` | `getMaxLiteralLength()` Gets the maximal length of a literal block.
    `int` | `getMaxOffset()` Gets the maximal offset of a back-reference found.
    `int` | `getMinBackReferenceLength()` Gets the minimal length of a back-reference found.
    `int` | `getNiceBackReferenceLength()` Gets the length of a back-reference that is considered nice enough to stop searching for longer ones.
    `int` | `getWindowSize()` Gets the size of the sliding window - this determines the maximum offset a back-reference can take.

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

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

- - ### Field Detail

    - #### TRUE_MIN_BACK_REFERENCE_LENGTH

          public static final int TRUE_MIN_BACK_REFERENCE_LENGTH

      The hard-coded absolute minimal length of a back-reference.
      See Also:
        Constant Field Values

  - ### Method Detail

    - #### builder

          public static Parameters.Builder builder(int windowSize)

      Initializes the builder for the compressor's parameters with a `minBackReferenceLength` of 3 and `max*Length` equal to `windowSize - 1`.

      It is recommended to not use this method directly but rather tune a pre-configured builder created by a format specific factory like `SnappyCompressorOutputStream.createParameterBuilder(int)`.

      Parameters:
        `windowSize` - the size of the sliding window - this determines the maximum offset a back-reference can take. Must be a power of two.
      Returns:
        a builder configured for the given window size
      Throws:
        `IllegalArgumentException` - if windowSize is not a power of two.

    - #### getWindowSize

          public int getWindowSize()

      Gets the size of the sliding window - this determines the maximum offset a back-reference can take.
      Returns:
        the size of the sliding window

    - #### getMinBackReferenceLength

          public int getMinBackReferenceLength()

      Gets the minimal length of a back-reference found.
      Returns:
        the minimal length of a back-reference found

    - #### getMaxBackReferenceLength

          public int getMaxBackReferenceLength()

      Gets the maximal length of a back-reference found.
      Returns:
        the maximal length of a back-reference found

    - #### getMaxOffset

          public int getMaxOffset()

      Gets the maximal offset of a back-reference found.
      Returns:
        the maximal offset of a back-reference found

    - #### getMaxLiteralLength

          public int getMaxLiteralLength()

      Gets the maximal length of a literal block.
      Returns:
        the maximal length of a literal block

    - #### getNiceBackReferenceLength

          public int getNiceBackReferenceLength()

      Gets the length of a back-reference that is considered nice enough to stop searching for longer ones.
      Returns:
        the length of a back-reference that is considered nice enough to stop searching

    - #### getMaxCandidates

          public int getMaxCandidates()

      Gets the maximum number of back-reference candidates to consider.
      Returns:
        the maximum number of back-reference candidates to consider

    - #### getLazyMatching

          public boolean getLazyMatching()

      Gets whether to perform lazy matching.
      Returns:
        whether to perform lazy matching

    - #### getLazyMatchingThreshold

          public int getLazyMatchingThreshold()

      Gets the threshold for lazy matching.
      Returns:
        the threshold for lazy matching

Copyright © 2002–2020 The Apache Software Foundation. All rights reserved.