FacetLabel (Lucene 10.5.1 facet API)
Description: declaration: package: org.apache.lucene.facet.taxonomy, class: FacetLabel

Package org.apache.lucene.facet.taxonomy

# Class FacetLabel

java.lang.Object
org.apache.lucene.facet.taxonomy.FacetLabel

All Implemented Interfaces:
  `Comparable<FacetLabel>`

public class FacetLabel extends Object implements Comparable<FacetLabel>
Holds a sequence of string components, specifying the hierarchical name of a category.

NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `final String[]`
  `components`
  The components of this `FacetLabel`.
  `final int`
  `length`
  The number of components of this `FacetLabel`.
  `static final int`
  `MAX_CATEGORY_PATH_LENGTH`
  The maximum number of characters a `FacetLabel` can have.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `FacetLabel(String... components)`
  Construct from the given path components.
  `FacetLabel(String dim, String[] path)`
  Construct from the dimension plus the given path components.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `int`
  `compareTo(FacetLabel other)`
  Compares this path with another `FacetLabel` for lexicographic order.
  `boolean`
  `equals(Object obj)`
  `int`
  `hashCode()`
  `String`
  `lastComponent()`
  Get the last component.
  `long`
  `longHashCode()`
  Calculate a 64-bit hash function for this path.
  `FacetLabel`
  `subpath(int length)`
  Returns a sub-path of this path up to `length` components.
  `String`
  `toString()`
  Returns a string representation of the path.

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

  `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

- ## Field Details

  - ### MAX_CATEGORY_PATH_LENGTH

    public static final int MAX_CATEGORY_PATH_LENGTH
    The maximum number of characters a `FacetLabel` can have.
    See Also:
      - Constant Field Values

  - ### components

    public final String[] components
    The components of this `FacetLabel`. Note that this array may be shared with other `FacetLabel` instances, e.g. as a result of `subpath(int)`, therefore you should traverse the array up to `length` for this path's components.

  - ### length

    public final int length
    The number of components of this `FacetLabel`.

- ## Constructor Details

  - ### FacetLabel

    public FacetLabel(String... components)
    Construct from the given path components.

  - ### FacetLabel

    public FacetLabel(String dim, String[] path)
    Construct from the dimension plus the given path components.

- ## Method Details

  - ### compareTo

    public int compareTo(FacetLabel other)
    Compares this path with another `FacetLabel` for lexicographic order.
    Specified by:
      `compareTo` in interface `Comparable<FacetLabel>`

  - ### equals

    public boolean equals(Object obj)
    Overrides:
      `equals` in class `Object`

  - ### hashCode

    public int hashCode()
    Overrides:
      `hashCode` in class `Object`

  - ### longHashCode

    public long longHashCode()
    Calculate a 64-bit hash function for this path. This is necessary for `NameHashIntCacheLRU` (the default cache impl for `LruTaxonomyWriterCache`) to reduce the chance of "silent but deadly" collisions.

  - ### subpath

    public FacetLabel subpath(int length)
    Returns a sub-path of this path up to `length` components.

  - ### lastComponent

    public String lastComponent()
    Get the last component.

  - ### toString

    public String toString()
    Returns a string representation of the path.
    Overrides:
      `toString` in class `Object`