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/OpenJDK 21

Class SortControl

java.lang.Object
javax.naming.ldap.BasicControl
javax.naming.ldap.SortControl
All Implemented Interfaces:
Serializable, Control
public final class SortControl extends BasicControl
Requests that the results of a search operation be sorted by the LDAP server before being returned. The sort criteria are specified using an ordered list of one or more sort keys, with associated sort parameters. Search results are sorted at the LDAP server according to the parameters supplied in the sort control and then returned to the requestor. If sorting is not supported at the server (and the sort control is marked as critical) then the search operation is not performed and an error is returned.

The following code sample shows how the class may be used:



     // Open an LDAP association
     LdapContext ctx = new InitialLdapContext();

     // Activate sorting
     String sortKey = "cn";
     ctx.setRequestControls(new Control[]{
         new SortControl(sortKey, Control.CRITICAL) });

     // Perform a search
     NamingEnumeration results =
         ctx.search("", "(objectclass=*)", new SearchControls());

     // Iterate over search results
     while (results != null && results.hasMore()) {
         // Display an entry
         SearchResult entry = (SearchResult)results.next();
         System.out.println(entry.getName());
         System.out.println(entry.getAttributes());

         // Handle the entry's response controls (if any)
         if (entry instanceof HasControls) {
             // ((HasControls)entry).getControls();
         }
     }
     // Examine the sort control response
     Control[] controls = ctx.getResponseControls();
     if (controls != null) {
         for (int i = 0; i < controls.length; i++) {
             if (controls[i] instanceof SortResponseControl) {
                 SortResponseControl src = (SortResponseControl)controls[i];
                 if (! src.isSorted()) {
                     throw src.getException();
                 }
             } else {
                 // Handle other response controls (if any)
             }
         }
     }

     // Close the LDAP association
     ctx.close();
     ...

 

This class implements the LDAPv3 Request Control for server-side sorting as defined in RFC 2891. The control's value has the following ASN.1 definition:


     SortKeyList ::= SEQUENCE OF SEQUENCE {
         attributeType     AttributeDescription,
         orderingRule  [0] MatchingRuleId OPTIONAL,
         reverseOrder  [1] BOOLEAN DEFAULT FALSE }

 
Since:
1.5
See Also:

Field Summary

Modifier and Type Field Description
static final String OID
The server-side sort control's assigned object identifier is 1.2.840.113556.1.4.473.

Fields declared in class javax.naming.ldap.BasicControl

criticality, id, value

Fields declared in interface javax.naming.ldap.Control

CRITICAL, NONCRITICAL

Constructor Summary

Constructor Description
SortControl(String[] sortBy, boolean criticality)
Constructs a control to sort on a list of attributes in ascending order.
SortControl(String sortBy, boolean criticality)
Constructs a control to sort on a single attribute in ascending order.
SortControl(SortKey[] sortBy, boolean criticality)
Constructs a control to sort on a list of sort keys.

Method Summary

Methods declared in class javax.naming.ldap.BasicControl

getEncodedValue, getID, isCritical

Methods declared in class java.lang.Object

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

Field Details

OID

public static final String OID
The server-side sort control's assigned object identifier is 1.2.840.113556.1.4.473.
See Also:

Constructor Details

SortControl

public SortControl(String sortBy, boolean criticality) throws IOException
Constructs a control to sort on a single attribute in ascending order. Sorting will be performed using the ordering matching rule defined for use with the specified attribute.
Parameters:
sortBy - An attribute ID to sort by.
criticality - If true then the server must honor the control and return the search results sorted as requested or refuse to perform the search. If false, then the server need not honor the control.
Throws:
IOException - If an error was encountered while encoding the supplied arguments into a control.

SortControl

public SortControl(String[] sortBy, boolean criticality) throws IOException
Constructs a control to sort on a list of attributes in ascending order. Sorting will be performed using the ordering matching rule defined for use with each of the specified attributes.
Parameters:
sortBy - A non-null list of attribute IDs to sort by. The list is in order of highest to lowest sort key precedence.
criticality - If true then the server must honor the control and return the search results sorted as requested or refuse to perform the search. If false, then the server need not honor the control.
Throws:
IOException - If an error was encountered while encoding the supplied arguments into a control.

SortControl

public SortControl(SortKey[] sortBy, boolean criticality) throws IOException
Constructs a control to sort on a list of sort keys. Each sort key specifies the sort order and ordering matching rule to use.
Parameters:
sortBy - A non-null list of keys to sort by. The list is in order of highest to lowest sort key precedence.
criticality - If true then the server must honor the control and return the search results sorted as requested or refuse to perform the search. If false, then the server need not honor the control.
Throws:
IOException - If an error was encountered while encoding the supplied arguments into a control.

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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
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https://docs.oracle.com/en/java/javase/21/docs/api/java.naming/javax/naming/ldap/SortControl.html