Package com.unboundid.ldap.sdk.controls

Class AssertionRequestControl

java.lang.Object
com.unboundid.ldap.sdk.Control
com.unboundid.ldap.sdk.controls.AssertionRequestControl
All Implemented Interfaces:
Serializable
@NotMutable @ThreadSafety(level=COMPLETELY_THREADSAFE) public final class AssertionRequestControl extends Control
This class provides an implementation of the LDAP assertion request control as defined in RFC 4528. It may be used in conjunction with an add, compare, delete, modify, modify DN, or search operation. The assertion control includes a search filter, and the associated operation should only be allowed to continue if the target entry matches the provided filter. If the filter does not match the target entry, then the operation should fail with an ResultCode.ASSERTION_FAILED result.

The behavior of the assertion request control makes it ideal for atomic "check and set" types of operations, particularly when modifying an entry. For example, it can be used to ensure that when changing the value of an attribute, the current value has not been modified since it was last retrieved.

Example

The following example demonstrates the use of the assertion request control. It shows an attempt to modify an entry's "accountBalance" attribute to set the value to "543.21" only if the current value is "1234.56": 
 Modification mod = new Modification(ModificationType.REPLACE,
      "accountBalance", "543.21");
 ModifyRequest modifyRequest =
      new ModifyRequest("uid=john.doe,ou=People,dc=example,dc=com", mod);
 modifyRequest.addControl(
      new AssertionRequestControl("(accountBalance=1234.56)"));

 LDAPResult modifyResult;
 try
 {
   modifyResult = connection.modify(modifyRequest);
   // If we've gotten here, then the modification was successful.
 }
 catch (LDAPException le)
 {
   modifyResult = le.toLDAPResult();
   ResultCode resultCode = le.getResultCode();
   String errorMessageFromServer = le.getDiagnosticMessage();
   if (resultCode == ResultCode.ASSERTION_FAILED)
   {
     // The modification failed because the account balance value wasn't
     // what we thought it was.
   }
   else
   {
     // The modification failed for some other reason.
   }
 }
See Also:

  • Field Details

  • Constructor Details

    • AssertionRequestControl

      public AssertionRequestControl(@NotNull String filter) throws LDAPException
      Creates a new assertion request control with the provided filter. It will be marked as critical.
      Parameters:
      filter - The string representation of the filter for this assertion control. It must not be null.
      Throws:
      LDAPException - If the provided filter string cannot be decoded as a search filter.

    • AssertionRequestControl

      public AssertionRequestControl(@NotNull Filter filter)
      Creates a new assertion request control with the provided filter. It will be marked as critical.
      Parameters:
      filter - The filter for this assertion control. It must not be null.

    • AssertionRequestControl

      public AssertionRequestControl(@NotNull String filter, boolean isCritical) throws LDAPException
      Creates a new assertion request control with the provided filter. It will be marked as critical.
      Parameters:
      filter - The string representation of the filter for this assertion control. It must not be null.
      isCritical - Indicates whether this control should be marked critical.
      Throws:
      LDAPException - If the provided filter string cannot be decoded as a search filter.

    • AssertionRequestControl

      public AssertionRequestControl(@NotNull Filter filter, boolean isCritical)
      Creates a new assertion request control with the provided filter. It will be marked as critical.
      Parameters:
      filter - The filter for this assertion control. It must not be null.
      isCritical - Indicates whether this control should be marked critical.

    • AssertionRequestControl

      public AssertionRequestControl(@NotNull Control control) throws LDAPException
      Creates a new assertion request control which is decoded from the provided generic control.
      Parameters:
      control - The generic control to be decoded as an assertion request control.
      Throws:
      LDAPException - If the provided control cannot be decoded as an assertion request control.

  • Method Details

    • generate

      @NotNull public static AssertionRequestControl generate(@NotNull Entry sourceEntry, @Nullable String... attributes)
      Generates an assertion request control that may be used to help ensure that some or all of the attributes in the specified entry have not changed since it was read from the server.
      Parameters:
      sourceEntry - The entry from which to take the attributes to include in the assertion request control. It must not be null and should have at least one attribute to be included in the generated filter.
      attributes - The names of the attributes to include in the assertion request control. If this is empty or null, then all attributes in the provided entry will be used.
      Returns:
      The generated assertion request control.

    • getFilter

      @NotNull public Filter getFilter()
      Retrieves the filter for this assertion control.
      Returns:
      The filter for this assertion control.

    • getControlName

      @NotNull public 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.
      Overrides:
      getControlName in class Control
      Returns:
      The user-friendly name for this control, or the OID if no user-friendly name is available.

    • toJSONControl

      @NotNull public JSONObject toJSONControl()
      Retrieves a representation of this assertion request control as a JSON object. The JSON object uses the following fields:
      • oid -- A mandatory string field whose value is the object identifier for this control. For the assertion request control, the OID is "1.3.6.1.1.12".
      • control-name -- An optional string field whose value is a human-readable name for this control. This field is only intended for descriptive purposes, and when decoding a control, the oid field should be used to identify the type of control.
      • criticality -- A mandatory Boolean field used to indicate whether this control is considered critical.
      • value-base64 -- An optional string field whose value is a base64-encoded representation of the raw value for this assertion request control. Exactly one of the value-base64 and value-json fields must be present.
      • value-json -- An optional JSON object field whose value is a user-friendly representation of the value for this assertion request control. Exactly one of the value-base64 and value-json fields must be present, and if the value-json field is used, then it will use the following fields:
        • filter -- A mandatory string field whose value is a string representation of the assertion filter.
      Overrides:
      toJSONControl in class Control
      Returns:
      A JSON object that contains a representation of this control.

    • decodeJSONControl

      @NotNull public static AssertionRequestControl decodeJSONControl(@NotNull JSONObject controlObject, boolean strict) throws LDAPException
      Attempts to decode the provided object as a JSON representation of an assertion request control.
      Parameters:
      controlObject - The JSON object to be decoded. It must not be null.
      strict - Indicates whether to use strict mode when decoding the provided JSON object. If this is true, then this method will throw an exception if the provided JSON object contains any unrecognized fields. If this is false, then unrecognized fields will be ignored.
      Returns:
      The assertion request control that was decoded from the provided JSON object.
      Throws:
      LDAPException - If the provided JSON object cannot be parsed as a valid assertion request control.

    • toString

      public void toString(@NotNull StringBuilder buffer)
      Appends a string representation of this LDAP control to the provided buffer.
      Overrides:
      toString in class Control
      Parameters:
      buffer - The buffer to which to append the string representation of this buffer.