javax.naming.ldap

Класс SortControl

java.lang. Объект

javax.naming.ldap. BasicControl

javax.naming.ldap. SortControl

Все Реализованные Интерфейсы:

Сериализуемый, Управление

public final class SortControl
extends BasicControl

Запросы, что результаты поисковой работы быть сортированным сервером LDAP прежде, чем быть возвращенным. Критерии сортировки определяются, используя упорядоченный список одного или более ключей сортировки со связанными параметрами вида. Результаты поиска сортируются в сервере LDAP согласно параметрам, предоставленным в управлении видом, и затем возвратились к просителю. Если сортировка не поддерживается в сервере (и управление видом отмечается как критическое), тогда, поисковая работа не выполняется, и ошибка возвращается.

Следующий пример кода показывает, как класс может использоваться:

     // 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 ... pre>
 

 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:

SortKey, SortResponseControl, Serialized Form

Field Summary

Fields

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

Fields inherited from class javax.naming.ldap.BasicControl

criticality, id, value

Fields inherited from interface javax.naming.ldap.Control

CRITICAL, NONCRITICAL

Constructor Summary

Constructors

Constructor and Description
SortControl(SortKey[] sortBy, boolean criticality) Constructs a control to sort on a list of sort keys.
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.

Method Summary

Methods inherited from class javax.naming.ldap.BasicControl

getEncodedValue, getID, isCritical

Methods inherited from class java.lang.Object

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

Field Detail

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:

Constant Field Values

Constructor Detail

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.