Package org.apache.lucene.document

Class LongField

java.lang.Object
org.apache.lucene.document.Field
org.apache.lucene.document.LongField
All Implemented Interfaces:
IndexableField
public final class LongField extends Field
Field that stores a per-document long value for scoring, sorting or value retrieval and index the field for fast range filters. If you need more fine-grained control you can use LongPoint, NumericDocValuesField or SortedNumericDocValuesField, and StoredField.

This field defines static factory methods for creating common queries:

See Also:

  • Constructor Details

    • LongField

      public LongField(String name, long value, Field.Store stored)
      Creates a new LongField, indexing the provided point, storing it as a DocValue, and optionally storing it as a stored field.
      Parameters:
      name - field name
      value - the long value
      stored - whether to store the field
      Throws:
      IllegalArgumentException - if the field name or value is null.

  • Method Details

    • binaryValue

      public BytesRef binaryValue()
      Description copied from interface: IndexableField
      Non-null if this field has a binary value
      Specified by:
      binaryValue in interface IndexableField
      Overrides:
      binaryValue in class Field

    • storedValue

      public StoredValue storedValue()
      Description copied from interface: IndexableField
      Stored value. This method is called to populate stored fields and must return a non-null value if the field stored.
      Specified by:
      storedValue in interface IndexableField
      Overrides:
      storedValue in class Field

    • setLongValue

      public void setLongValue(long value)
      Description copied from class: Field
      Expert: change the value of this field. See Field.setStringValue(String).
      Overrides:
      setLongValue in class Field

    • toString

      public String toString()
      Description copied from class: Field
      Prints a Field for human consumption.
      Overrides:
      toString in class Field

    • newExactQuery

      public static Query newExactQuery(String field, long value)
      Create a query for matching an exact long value.
      Parameters:
      field - field name. must not be null.
      value - exact value
      Returns:
      a query matching documents with this exact value
      Throws:
      IllegalArgumentException - if field is null.

    • newRangeQuery

      public static Query newRangeQuery(String field, long lowerValue, long upperValue)
      Create a range query for long values.

      You can have half-open ranges (which are in fact </≤ or >/≥ queries) by setting lowerValue = Long.MIN_VALUE or upperValue = Long.MAX_VALUE.

      Ranges are inclusive. For exclusive ranges, pass Math.addExact(lowerValue, 1) or Math.addExact(upperValue, -1).

      Parameters:
      field - field name. must not be null.
      lowerValue - lower portion of the range (inclusive).
      upperValue - upper portion of the range (inclusive).
      Returns:
      a query matching documents within this range.
      Throws:
      IllegalArgumentException - if field is null.

    • newSetQuery

      public static Query newSetQuery(String field, long... values)
      Create a query matching values in a supplied set
      Parameters:
      field - field name. must not be null.
      values - long values
      Returns:
      a query matching documents within this set.
      Throws:
      IllegalArgumentException - if field is null.

    • newSortField

      public static SortField newSortField(String field, boolean reverse, SortedNumericSelector.Type selector)
      Create a new SortField for long values.
      Parameters:
      field - field name. must not be null.
      reverse - true if natural order should be reversed.
      selector - custom selector type for choosing the sort value from the set.

    • newDistanceFeatureQuery

      public static Query newDistanceFeatureQuery(String field, float weight, long origin, long pivotDistance)
      Returns a query that scores documents based on their distance to origin: score = weight * pivotDistance / (pivotDistance + distance), ie. score is in the [0, weight] range, is equal to weight when the document's value is equal to origin and is equal to weight/2 when the document's value is distant of pivotDistance from origin. In case of multi-valued fields, only the closest point to origin will be considered. This query is typically useful to boost results based on recency by adding this query to a BooleanClause.Occur.SHOULD clause of a BooleanQuery.