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## org.apache.lucene.search
Class SortField

    java.lang.Object
      org.apache.lucene.search.SortField

All Implemented Interfaces:
  Serializable

public class SortField
extends Object
implements Serializable

Stores information about how to sort documents by terms in an individual field. Fields must be indexed in order to sort by them.

Created: Feb 11, 2004 1:25:29 PM

Since:
  lucene 1.4
Version:
  $Id: SortField.java,v 1.9 2004/05/24 22:51:42 tjones Exp $
Author:
  Tim Jones (Nacimiento Software)
See Also:
  `Sort`, Serialized Form

Field Summary
`static int` | `AUTO` Guess type of sort based on field contents.
`static int` | `CUSTOM` Sort using a custom Comparator.
`static int` | `DOC` Sort by document number (index order).
`static SortField` | `FIELD_DOC` Represents sorting by document number (index order).
`static SortField` | `FIELD_SCORE` Represents sorting by document score (relevancy).
`static int` | `FLOAT` Sort using term values as encoded Floats.
`static int` | `INT` Sort using term values as encoded Integers.
`static int` | `SCORE` Sort by document score (relevancy).
`static int` | `STRING` Sort using term values as Strings.

Constructor Summary
`SortField(String field)` Creates a sort by terms in the given field where the type of term value is determined dynamically (`AUTO`).
`SortField(String field, boolean reverse)` Creates a sort, possibly in reverse, by terms in the given field where the type of term value is determined dynamically (`AUTO`).
`SortField(String field, int type)` Creates a sort by terms in the given field with the type of term values explicitly given.
`SortField(String field, int type, boolean reverse)` Creates a sort, possibly in reverse, by terms in the given field with the type of term values explicitly given.
`SortField(String field, Locale locale)` Creates a sort by terms in the given field sorted according to the given locale.
`SortField(String field, Locale locale, boolean reverse)` Creates a sort, possibly in reverse, by terms in the given field sorted according to the given locale.
`SortField(String field, SortComparatorSource comparator)` Creates a sort with a custom comparison function.
`SortField(String field, SortComparatorSource comparator, boolean reverse)` Creates a sort, possibly in reverse, with a custom comparison function.

Method Summary
`SortComparatorSource` | `getFactory()`
`String` | `getField()` Returns the name of the field.
`Locale` | `getLocale()` Returns the Locale by which term values are interpreted.
`boolean` | `getReverse()` Returns whether the sort should be reversed.
`int` | `getType()` Returns the type of contents in the field.
`String` | `toString()`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### SCORE

    public static final int SCORE

  Sort by document score (relevancy). Sort values are Float and higher values are at the front.

  See Also:
    Constant Field Values

### DOC

    public static final int DOC

  Sort by document number (index order). Sort values are Integer and lower values are at the front.

  See Also:
    Constant Field Values

### AUTO

    public static final int AUTO

  Guess type of sort based on field contents. A regular expression is used to look at the first term indexed for the field and determine if it represents an integer number, a floating point number, or just arbitrary string characters.

  See Also:
    Constant Field Values

### STRING

    public static final int STRING

  Sort using term values as Strings. Sort values are String and lower values are at the front.

  See Also:
    Constant Field Values

### INT

    public static final int INT

  Sort using term values as encoded Integers. Sort values are Integer and lower values are at the front.

  See Also:
    Constant Field Values

### FLOAT

    public static final int FLOAT

  Sort using term values as encoded Floats. Sort values are Float and lower values are at the front.

  See Also:
    Constant Field Values

### CUSTOM

    public static final int CUSTOM

  Sort using a custom Comparator. Sort values are any Comparable and sorting is done according to natural order.

  See Also:
    Constant Field Values

### FIELD_SCORE

    public static final SortField FIELD_SCORE

  Represents sorting by document score (relevancy).

### FIELD_DOC

    public static final SortField FIELD_DOC

  Represents sorting by document number (index order).

Constructor Detail

### SortField

    public SortField(String field)

  Creates a sort by terms in the given field where the type of term value is determined dynamically (`AUTO`).

Parameters:
  `field` - Name of field to sort by, cannot be `null`.

### SortField

    public SortField(String field,
                     boolean reverse)

  Creates a sort, possibly in reverse, by terms in the given field where the type of term value is determined dynamically (`AUTO`).

Parameters:
  `field` - Name of field to sort by, cannot be `null`.
  `reverse` - True if natural order should be reversed.

### SortField

    public SortField(String field,
                     int type)

  Creates a sort by terms in the given field with the type of term values explicitly given.

Parameters:
  `field` - Name of field to sort by. Can be `null` if `type` is SCORE or DOC.
  `type` - Type of values in the terms.

### SortField

    public SortField(String field,
                     int type,
                     boolean reverse)

  Creates a sort, possibly in reverse, by terms in the given field with the type of term values explicitly given.

Parameters:
  `field` - Name of field to sort by. Can be `null` if `type` is SCORE or DOC.
  `type` - Type of values in the terms.
  `reverse` - True if natural order should be reversed.

### SortField

    public SortField(String field,
                     Locale locale)

  Creates a sort by terms in the given field sorted according to the given locale.

Parameters:
  `field` - Name of field to sort by, cannot be `null`.
  `locale` - Locale of values in the field.

### SortField

    public SortField(String field,
                     Locale locale,
                     boolean reverse)

  Creates a sort, possibly in reverse, by terms in the given field sorted according to the given locale.

Parameters:
  `field` - Name of field to sort by, cannot be `null`.
  `locale` - Locale of values in the field.

### SortField

    public SortField(String field,
                     SortComparatorSource comparator)

  Creates a sort with a custom comparison function.

Parameters:
  `field` - Name of field to sort by; cannot be `null`.
  `comparator` - Returns a comparator for sorting hits.

### SortField

    public SortField(String field,
                     SortComparatorSource comparator,
                     boolean reverse)

  Creates a sort, possibly in reverse, with a custom comparison function.

Parameters:
  `field` - Name of field to sort by; cannot be `null`.
  `comparator` - Returns a comparator for sorting hits.
  `reverse` - True if natural order should be reversed.

Method Detail

### getField

    public String getField()

  Returns the name of the field. Could return `null` if the sort is by SCORE or DOC.

  Returns:
    Name of field, possibly `null`.

### getType

    public int getType()

  Returns the type of contents in the field.

  Returns:
    One of the constants SCORE, DOC, AUTO, STRING, INT or FLOAT.

### getLocale

    public Locale getLocale()

  Returns the Locale by which term values are interpreted. May return `null` if no Locale was specified.

  Returns:
    Locale, or `null`.

### getReverse

    public boolean getReverse()

  Returns whether the sort should be reversed.

  Returns:
    True if natural order should be reversed.

### getFactory

    public SortComparatorSource getFactory()

### toString

    public String toString()

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