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134 lines
3.4 KiB
134 lines
3.4 KiB
/*
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* Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package javax.naming.ldap;
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import java.io.IOException;
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import com.sun.jndi.ldap.Ber;
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import com.sun.jndi.ldap.BerDecoder;
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/**
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* Indicates the end of a batch of search results.
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* Contains an estimate of the total number of entries in the result set
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* and an opaque cookie. The cookie must be supplied to the next search
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* operation in order to get the next batch of results.
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* <p>
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* The code sample in {@link PagedResultsControl} shows how this class may
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* be used.
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* <p>
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* This class implements the LDAPv3 Response Control for
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* paged-results as defined in
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* <a href="http://www.ietf.org/rfc/rfc2696">RFC 2696</a>.
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*
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* The control's value has the following ASN.1 definition:
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* <pre>
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*
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* realSearchControlValue ::= SEQUENCE {
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* size INTEGER (0..maxInt),
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* -- requested page size from client
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* -- result set size estimate from server
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* cookie OCTET STRING
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* }
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*
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* </pre>
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*
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* @since 1.5
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* @see PagedResultsControl
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* @author Vincent Ryan
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*/
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final public class PagedResultsResponseControl extends BasicControl {
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/**
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* The paged-results response control's assigned object identifier
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* is 1.2.840.113556.1.4.319.
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*/
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public static final String OID = "1.2.840.113556.1.4.319";
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private static final long serialVersionUID = -8819778744844514666L;
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/**
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* An estimate of the number of entries in the search result.
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*
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* @serial
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*/
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private int resultSize;
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/**
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* A server-generated cookie.
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*
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* @serial
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*/
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private byte[] cookie;
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/**
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* Constructs a paged-results response control.
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*
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* @param id The control's object identifier string.
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* @param criticality The control's criticality.
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* @param value The control's ASN.1 BER encoded value.
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* It is not cloned - any changes to value
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* will affect the contents of the control.
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* @exception IOException If an error was encountered while decoding
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* the control's value.
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*/
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public PagedResultsResponseControl(String id, boolean criticality,
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byte[] value) throws IOException {
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super(id, criticality, value);
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// decode value
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BerDecoder ber = new BerDecoder(value, 0, value.length);
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ber.parseSeq(null);
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resultSize = ber.parseInt();
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cookie = ber.parseOctetString(Ber.ASN_OCTET_STR, null);
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}
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/**
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* Retrieves (an estimate of) the number of entries in the search result.
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*
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* @return The number of entries in the search result, or zero if unknown.
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*/
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public int getResultSize() {
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return resultSize;
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}
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/**
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* Retrieves the server-generated cookie. Null is returned when there are
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* no more entries for the server to return.
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*
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* @return A possibly null server-generated cookie. It is not cloned - any
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* changes to the cookie will update the control's state and thus
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* are not recommended.
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*/
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public byte[] getCookie() {
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if (cookie.length == 0) {
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return null;
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} else {
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return cookie;
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}
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}
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}
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