PagedResultsControl

Class Overview

Requests that the results of a search operation be returned by the LDAP server in batches of a specified size. The requestor controls the rate at which batches are returned by the rate at which it invokes search operations.

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

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

     // Activate paged results
     int pageSize = 20; // 20 entries per page
     byte[] cookie = null;
     int total;
     ctx.setRequestControls(new Control[]{
         new PagedResultsControl(pageSize, Control.CRITICAL) });

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

         // Iterate over a batch of 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 paged results control response
         Control[] controls = ctx.getResponseControls();
         if (controls != null) {
             for (int i = 0; i < controls.length; i++) {
                 if (controls[i] instanceof PagedResultsResponseControl) {
                     PagedResultsResponseControl prrc =
                         (PagedResultsResponseControl)controls[i];
                     total = prrc.getResultSize();
                     cookie = prrc.getCookie();
                 } else {
                     // Handle other response controls (if any)
                 }
             }
         }

         // Re-activate paged results
         ctx.setRequestControls(new Control[]{
             new PagedResultsControl(pageSize, cookie, Control.CRITICAL) });
     } while (cookie != null);

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

 

This class implements the LDAPv3 Control for paged-results as defined in RFC 2696. The control's value has the following ASN.1 definition:

     realSearchControlValue ::= SEQUENCE {
         size      INTEGER (0..maxInt),
                           -- requested page size from client
                           -- result set size estimate from server
         cookie    OCTET STRING
     }

 

Summary

[Expand] Inherited Constants
From interface javax.naming.ldap.Control boolean CRITICAL Indicates a critical control. boolean NONCRITICAL Indicates a non-critical control.

[Expand] Inherited Fields
From class javax.naming.ldap.BasicControl protected boolean criticality The control's criticality. protected String id The control's object identifier string. protected byte[] value The control's ASN.1 BER encoded value.

[Expand] Inherited Methods
From class javax.naming.ldap.BasicControl byte[] getEncodedValue() Retrieves the control's ASN.1 BER encoded value. String getID() Retrieves the control's object identifier string. boolean isCritical() Determines the control's criticality.
From class java.lang.Object Object clone() Creates and returns a copy of this object. boolean equals(Object obj) Indicates whether some other object is "equal to" this one. void finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. final Class<?> getClass() Returns the runtime class of this Object. int hashCode() Returns a hash code value for the object. final void notify() Wakes up a single thread that is waiting on this object's monitor. final void notifyAll() Wakes up all threads that are waiting on this object's monitor. String toString() Returns a string representation of the object. final void wait() Causes the current thread to wait until another thread invokes the notify() method or the notifyAll() method for this object. final void wait(long timeout, int nanos) Causes the current thread to wait until another thread invokes the notify() method or the notifyAll() method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed. final void wait(long timeout) Causes the current thread to wait until either another thread invokes the notify() method or the notifyAll() method for this object, or a specified amount of time has elapsed.
From interface javax.naming.ldap.Control abstract byte[] getEncodedValue() Retrieves the ASN.1 BER encoded value of the LDAP control. abstract String getID() Retrieves the object identifier assigned for the LDAP control. abstract boolean isCritical() Determines the criticality of the LDAP control.