com.unboundid.ldap.sdk
Class Control

java.lang.Object
  com.unboundid.ldap.sdk.Control

All Implemented Interfaces:

java.io.Serializable

Direct Known Subclasses:

ActiveDirectoryDirSyncControl, AssertionRequestControl, AuthorizationIdentityRequestControl, AuthorizationIdentityResponseControl, ContentSyncDoneControl, ContentSyncRequestControl, ContentSyncStateControl, DontUseCopyRequestControl, DraftBeheraLDAPPasswordPolicy10RequestControl, DraftBeheraLDAPPasswordPolicy10ResponseControl, DraftZeilengaLDAPNoOp12RequestControl, EntryChangeNotificationControl, ManageDsaITRequestControl, MatchedValuesRequestControl, PasswordExpiredControl, PasswordExpiringControl, PermissiveModifyRequestControl, PersistentSearchRequestControl, PostReadRequestControl, PostReadResponseControl, PreReadRequestControl, PreReadResponseControl, ProxiedAuthorizationV1RequestControl, ProxiedAuthorizationV2RequestControl, ServerSideSortRequestControl, ServerSideSortResponseControl, SimplePagedResultsControl, SubentriesRequestControl, SubtreeDeleteRequestControl, TransactionSpecificationRequestControl, VirtualListViewRequestControl, VirtualListViewResponseControl

@Extensible
@NotMutable
@ThreadSafety(level=COMPLETELY_THREADSAFE)
public class Control
extends java.lang.Object
implements java.io.Serializable

This class provides a data structure that represents an LDAP control. A control is an element that may be attached to an LDAP request or response to provide additional information about the processing that should be (or has been) performed. This class may be overridden to provide additional processing for specific types of controls.

A control includes the following elements:

• An object identifier (OID), which identifies the type of control.
• A criticality flag, which indicates whether the control should be considered critical to the processing of the operation. If a control is marked critical but the server either does not support that control or it is not appropriate for the associated request, then the server will reject the request. If a control is not marked critical and the server either does not support it or it is not appropriate for the associated request, then the server will simply ignore that control and process the request as if it were not present.
• An optional value, which provides additional information for the control. Some controls do not take values, and the value encoding for controls which do take values varies based on the type of control.

Controls may be included in a request from the client to the server, as well as responses from the server to the client (including intermediate response, search result entry, and search result references, in addition to the final response message for an operation). When using request controls, they may be included in the request object at the time it is created, or may be added after the fact for UpdatableLDAPRequest objects. When using response controls, each response control class includes a get method that can be used to extract the appropriate control from an appropriate result (e.g., LDAPResult, SearchResultEntry, or SearchResultReference).

See Also:

Serialized Form

Constructor Summary

protected	Control() Creates a new empty control instance that is intended to be used only for decoding controls via the DecodeableControl interface.
protected	Control(Control control) Creates a new control whose fields are initialized from the contents of the provided control.
	Control(java.lang.String oid) Creates a new control with the provided OID.
	Control(java.lang.String oid, boolean isCritical) Creates a new control with the provided OID and criticality.
	Control(java.lang.String oid, boolean isCritical, ASN1OctetString value) Creates a new control with the provided information.

Method Summary

static Control	decode(ASN1Sequence controlSequence) Decodes the provided ASN.1 sequence as an LDAP control.
static Control	decode(java.lang.String oid, boolean isCritical, ASN1OctetString value) Attempts to create the most appropriate control instance from the provided information.
static Control[]	decodeControls(ASN1Sequence controlSequence) Decodes the contents of the provided sequence as a set of controls.
static void	deregisterDecodeableControl(java.lang.String oid) Deregisters the decodeable control class associated with the provided OID.
ASN1Sequence	encode() Encodes this control to an ASN.1 sequence suitable for use in an LDAP message.
static ASN1Sequence	encodeControls(Control[] controls) Encodes the provided set of controls to an ASN.1 sequence suitable for inclusion in an LDAP message.
boolean	equals(java.lang.Object o) Indicates whether the provided object may be considered equal to this control.
java.lang.String	getControlName() Retrieves the user-friendly name for this control, if available.
java.lang.String	getOID() Retrieves the OID for this control.
ASN1OctetString	getValue() Retrieves the encoded value for this control.
int	hashCode() Retrieves a hash code for this control.
boolean	hasValue() Indicates whether this control has a value.
boolean	isCritical() Indicates whether this control should be considered critical.
static Control	readFrom(ASN1StreamReader reader) Reads an LDAP control from the provided ASN.1 stream reader.
static void	registerDecodeableControl(java.lang.String oid, DecodeableControl controlInstance) Registers the provided class to be used in an attempt to decode controls with the specified OID.
java.lang.String	toString() Retrieves a string representation of this LDAP control.
void	toString(java.lang.StringBuilder buffer) Appends a string representation of this LDAP control to the provided buffer.
void	writeTo(ASN1Buffer writer) Writes an ASN.1-encoded representation of this control to the provided ASN.1 stream writer.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Control

protected Control()

Creates a new empty control instance that is intended to be used only for decoding controls via the DecodeableControl interface. All DecodeableControl objects must provide a default constructor that can be used to create an instance suitable for invoking the decodeControl method.

Control

protected Control(Control control)

Creates a new control whose fields are initialized from the contents of the provided control.

Parameters:

control - The control whose information should be used to create this new control.

Control

public Control(java.lang.String oid)

Creates a new control with the provided OID. It will not be critical, and it will not have a value.

Parameters:

oid - The OID for this control. It must not be null.

Control

public Control(java.lang.String oid,
               boolean isCritical)

Creates a new control with the provided OID and criticality. It will not have a value.

Parameters:

oid - The OID for this control. It must not be null.

isCritical - Indicates whether this control should be considered critical.

Control

public Control(java.lang.String oid,
               boolean isCritical,
               ASN1OctetString value)

Creates a new control with the provided information.

Parameters:

oid - The OID for this control. It must not be null.

isCritical - Indicates whether this control should be considered critical.

value - The value for this control. It may be null if there is no value.

Method Detail

getOID

public final java.lang.String getOID()

Retrieves the OID for this control.

Returns:

The OID for this control.

isCritical

public final boolean isCritical()

Indicates whether this control should be considered critical.

Returns:

true if this control should be considered critical, or false if not.

hasValue

public final boolean hasValue()

Indicates whether this control has a value.

Returns:

true if this control has a value, or false if not.

getValue

public final ASN1OctetString getValue()

Retrieves the encoded value for this control.

Returns:

The encoded value for this control, or null if there is no value.

writeTo

public final void writeTo(ASN1Buffer writer)

Writes an ASN.1-encoded representation of this control to the provided ASN.1 stream writer.

Parameters:

writer - The ASN.1 stream writer to which the encoded representation should be written.

encode

public final ASN1Sequence encode()

Encodes this control to an ASN.1 sequence suitable for use in an LDAP message.

Returns:

The encoded representation of this control.

readFrom

public static Control readFrom(ASN1StreamReader reader)
                        throws LDAPException

Reads an LDAP control from the provided ASN.1 stream reader.

Parameters:

reader - The ASN.1 stream reader from which to read the control.

Returns:

The decoded control.

Throws:

LDAPException - If a problem occurs while attempting to read or parse the control.

decode

public static Control decode(ASN1Sequence controlSequence)
                      throws LDAPException

Decodes the provided ASN.1 sequence as an LDAP control.

Parameters:

controlSequence - The ASN.1 sequence to be decoded.

Returns:

The decoded control.

Throws:

LDAPException - If a problem occurs while attempting to decode the provided ASN.1 sequence as an LDAP control.

decode

public static Control decode(java.lang.String oid,
                             boolean isCritical,
                             ASN1OctetString value)
                      throws LDAPException

Attempts to create the most appropriate control instance from the provided information. If a DecodeableControl instance has been registered for the specified OID, then this method will attempt to use that instance to construct a control. If that fails, or if no appropriate DecodeableControl is registered, then a generic control will be returned.

Parameters:

oid - The OID for the control. It must not be null.

isCritical - Indicates whether the control should be considered critical.

value - The value for the control. It may be null if there is no value.

Returns:

The decoded control.

Throws:

LDAPException - If a problem occurs while attempting to decode the provided ASN.1 sequence as an LDAP control.

encodeControls

public static ASN1Sequence encodeControls(Control[] controls)

Encodes the provided set of controls to an ASN.1 sequence suitable for inclusion in an LDAP message.

Parameters:

controls - The set of controls to be encoded.

Returns:

An ASN.1 sequence containing the encoded set of controls.

decodeControls

public static Control[] decodeControls(ASN1Sequence controlSequence)
                                throws LDAPException

Decodes the contents of the provided sequence as a set of controls.

Parameters:

controlSequence - The ASN.1 sequence containing the encoded set of controls.

Returns:

The decoded set of controls.

Throws:

LDAPException - If a problem occurs while attempting to decode any of the controls.

registerDecodeableControl

public static void registerDecodeableControl(java.lang.String oid,
                                             DecodeableControl controlInstance)

Registers the provided class to be used in an attempt to decode controls with the specified OID.

Parameters:

oid - The response control OID for which the provided class will be registered.

controlInstance - The control instance that should be used to decode controls with the provided OID.

deregisterDecodeableControl

public static void deregisterDecodeableControl(java.lang.String oid)

Deregisters the decodeable control class associated with the provided OID.

Parameters:

oid - The response control OID for which to deregister the decodeable control class.

hashCode

public final int hashCode()

Retrieves a hash code for this control.

Overrides:

hashCode in class java.lang.Object

Returns:

A hash code for this control.

equals

public final boolean equals(java.lang.Object o)

Indicates whether the provided object may be considered equal to this control.

Overrides:

equals in class java.lang.Object

Parameters:

o - The object for which to make the determination.

Returns:

true if the provided object may be considered equal to this control, or false if not.

getControlName

public java.lang.String getControlName()

Retrieves the user-friendly name for this control, if available. If no user-friendly name has been defined, then the OID will be returned.

Returns:

The user-friendly name for this control, or the OID if no user-friendly name is available.

toString

public java.lang.String toString()

Retrieves a string representation of this LDAP control.

Overrides:

toString in class java.lang.Object

Returns:

A string representation of this LDAP control.

toString

public void toString(java.lang.StringBuilder buffer)

Appends a string representation of this LDAP control to the provided buffer.

Parameters:

buffer - The buffer to which to append the string representation of this buffer.