All Known Implementing Classes:

AdNotificationRequestControl, AssertionRequestControl, AuthorizationIdentityRequestControl, AuthorizationIdentityResponseControl, ChangeNumberControlPlugin.ChangeNumberResponseControl, EntryChangelogNotificationResponseControl, EntryChangeNotificationResponseControl, ExternalChangelogRequestControl, GenericControl, GetEffectiveRightsRequestControl, InternalModificationsRequestControl, ManageDsaItRequestControl, MatchedValuesRequestControl, PasswordExpiredResponseControl, PasswordExpiringResponseControl, PasswordPolicyRequestControl, PasswordPolicyResponseControl, PermissiveModifyRequestControl, PersistentSearchRequestControl, PostReadRequestControl, PostReadResponseControl, PreReadRequestControl, PreReadResponseControl, ProxiedAuthV1RequestControl, ProxiedAuthV2RequestControl, RelaxRulesRequestControl, ReplicatedRequestControl, ReplicationRepairRequestControl, SearchBaseDnBackendOnlyControl, ServerSideSortRequestControl, ServerSideSortResponseControl, SimplePagedResultsControl, SubentriesRequestControl, SubtreeDeleteRequestControl, VirtualListViewRequestControl, VirtualListViewResponseControl
```
public interface Control
```
Controls provide a mechanism whereby the semantics and arguments of existing LDAP operations may be extended. One or more controls may be attached to a single LDAP message. A control only affects the semantics of the message it is attached to. Controls sent by clients are termed 'request controls', and those sent by servers are termed 'response controls'.
To determine whether a directory server supports a given control, read the list of supported controls from the root DSE to get a collection of control OIDs, and then check for a match:
```
 
 Connection connection = ...;
 Collection&lt;String&gt; supported =
     RootDSE.readRootDSE(connection).getSupportedControls();

 Control control = ...;
 String OID = control.getOID();
 if (supported != null && !supported.isEmpty() && supported.contains(OID)) {
     // The control is supported. Use it here...
 }
 
 
```
See Also:

RFC 4511 - Lightweight Directory Access Protocol (LDAP): The Protocol

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`String`	`getOid()`	Returns the numeric OID associated with this control.
`ByteString`	`getValue()`	Returns the value, if any, associated with this control.
`boolean`	`hasValue()`	Returns `true` if this control has a value.
`boolean`	`isCritical()`	Returns `true` if it is unacceptable to perform the operation without applying the semantics of this control.

- Method Detail
  - getOid
```
String getOid()
```
    Returns the numeric OID associated with this control.
    
    Returns:
    
    The numeric OID associated with this control.
  - getValue
```
ByteString getValue()
```
    Returns the value, if any, associated with this control. Its format is defined by the specification of this control.
    
    Returns:
    
    The value associated with this control, or null if there is no value.
  - hasValue
```
boolean hasValue()
```
    Returns true if this control has a value. In some circumstances it may be useful to determine if a control has a value, without actually calculating the value and incurring any performance costs.
    
    Returns:
    
    true if this control has a value, or false if there is no value.
  - isCritical
```
boolean isCritical()
```
    Returns true if it is unacceptable to perform the operation without applying the semantics of this control.
    The criticality field only has meaning in controls attached to request messages (except UnbindRequest). For controls attached to response messages and the UnbindRequest, the criticality field SHOULD be false, and MUST be ignored by the receiving protocol peer. A value of true indicates that it is unacceptable to perform the operation without applying the semantics of the control.
    
    Returns:
    
    true if this control must be processed by the Directory Server, or false if it can be ignored.

Interface Control

Method Summary

Method Detail

getOid

getValue

hasValue

isCritical