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## org.apache.lucene.facet.params
Enum CategoryListParams.OrdinalPolicy

    java.lang.Object
      java.lang.Enum<CategoryListParams.OrdinalPolicy>
          org.apache.lucene.facet.params.CategoryListParams.OrdinalPolicy

All Implemented Interfaces:
  Serializable, Comparable<CategoryListParams.OrdinalPolicy>

Enclosing class:
  CategoryListParams

    public static enum CategoryListParams.OrdinalPolicy

extends Enum<CategoryListParams.OrdinalPolicy>

Defines which category ordinals are encoded for every document. This also affects how category ordinals are aggregated, check the different policies for more details.

Enum Constant Summary
`ALL_BUT_DIMENSION` Encodes the ordinals of all path components except the dimension.
`ALL_PARENTS` Encodes the ordinals of all path components.
`NO_PARENTS` Encodes only the ordinals of leaf nodes.

Method Summary
`static CategoryListParams.OrdinalPolicy` | `valueOf(String name)` Returns the enum constant of this type with the specified name.
`static CategoryListParams.OrdinalPolicy[]` | `values()` Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum
`clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf`

Methods inherited from class java.lang.Object
`getClass, notify, notifyAll, wait, wait, wait`

Enum Constant Detail

### NO_PARENTS

    public static final CategoryListParams.OrdinalPolicy NO_PARENTS

  Encodes only the ordinals of leaf nodes. That is, for the category A/B/C, the ordinals of A and A/B will not be encoded. This policy is efficient for hierarchical dimensions, as it reduces the number of ordinals that are visited per document. During faceted search, this policy behaves exactly like `ALL_PARENTS`, and the counts of all path components will be computed as well.

  NOTE: this `CategoryListParams.OrdinalPolicy` requires a special collector or accumulator, which will fix the parents' counts.

  NOTE: since only leaf nodes are encoded for the document, you should use this policy when the same document doesn't share two categories that have a mutual parent, or otherwise the counts will be wrong (the mutual parent will be over-counted). For example, if a document has the categories A/B/C and A/B/D, then with this policy the counts of "A" and "B" will be 2, which is wrong. If you intend to index hierarchical dimensions, with more than one category per document, you should use either `ALL_PARENTS` or `ALL_BUT_DIMENSION`.

### ALL_PARENTS

    public static final CategoryListParams.OrdinalPolicy ALL_PARENTS

  Encodes the ordinals of all path components. That is, the category A/B/C will encode the ordinals of A and A/B as well. If you don't require the dimension's count during search, consider using `ALL_BUT_DIMENSION`.

### ALL_BUT_DIMENSION

    public static final CategoryListParams.OrdinalPolicy ALL_BUT_DIMENSION

  Encodes the ordinals of all path components except the dimension. The dimension of a category is defined to be the first components in `CategoryPath.components`. For the category A/B/C, the ordinal of A/B will be encoded as well, however not the ordinal of A.

  NOTE: when facets are aggregated, this policy behaves exactly like `ALL_PARENTS`, except that the dimension is never counted. I.e. if you ask to count the facet "A", then while in `ALL_PARENTS` you will get counts for "A" and its children, with this policy you will get counts for only its children. This policy is the default one, and makes sense for using with flat dimensions, whenever your application does not require the dimension's count. Otherwise, use `ALL_PARENTS`.

Method Detail

### values

    public static CategoryListParams.OrdinalPolicy[] values()

  Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

      for (CategoryListParams.OrdinalPolicy c : CategoryListParams.OrdinalPolicy.values())
          System.out.println(c);

  Returns:
    an array containing the constants of this enum type, in the order they are declared

### valueOf

    public static CategoryListParams.OrdinalPolicy valueOf(String name)

  Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

  Parameters:
    `name` - the name of the enum constant to be returned.
  Returns:
    the enum constant with the specified name
  Throws:
    `IllegalArgumentException` - if this enum type has no constant with the specified name
    `NullPointerException` - if the argument is null

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