javax.naming.ldap

## Class PagedResultsControl

- java.lang.Object
- - javax.naming.ldap.BasicControl
  - - javax.naming.ldap.PagedResultsControl

- All Implemented Interfaces:
    Serializable, Control

      public final class PagedResultsControl
      extends BasicControl

  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
           }

  Since:
    1.5
  See Also:
    `PagedResultsResponseControl`, Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `OID` The paged-results control's assigned object identifier is 1.2.840.113556.1.4.319.

    - ### 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
    `PagedResultsControl(int pageSize, boolean criticality)` Constructs a control to set the number of entries to be returned per page of results.
    `PagedResultsControl(int pageSize, byte[] cookie, boolean criticality)` Constructs a control to set the number of entries to be returned per page of results.

  - ### 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 paged-results control's assigned object identifier is 1.2.840.113556.1.4.319.
      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### PagedResultsControl

          public PagedResultsControl(int pageSize,
                             boolean criticality)
                              throws IOException

      Constructs a control to set the number of entries to be returned per page of results.
      Parameters:
        `pageSize` - The number of entries to return in a page.
        `criticality` - If true then the server must honor the control and return search results as indicated by pageSize 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.

    - #### PagedResultsControl

          public PagedResultsControl(int pageSize,
                             byte[] cookie,
                             boolean criticality)
                              throws IOException

      Constructs a control to set the number of entries to be returned per page of results. The cookie is provided by the server and may be obtained from the paged-results response control.

      A sequence of paged-results can be abandoned by setting the pageSize to zero and setting the cookie to the last cookie received from the server.

      Parameters:
        `pageSize` - The number of entries to return in a page.
        `cookie` - A possibly null server-generated cookie.
        `criticality` - If true then the server must honor the control and return search results as indicated by pageSize 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.

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