/* See LICENSE for licensing and NOTICE for copyright. */
package org.ldaptive.control;
import java.nio.ByteBuffer;
import org.ldaptive.LdapUtils;
import org.ldaptive.asn1.AbstractParseHandler;
import org.ldaptive.asn1.ConstructedDEREncoder;
import org.ldaptive.asn1.DERParser;
import org.ldaptive.asn1.DERPath;
import org.ldaptive.asn1.IntegerType;
import org.ldaptive.asn1.OctetStringType;
import org.ldaptive.asn1.UniversalDERTag;
/**
* Request/response control for PagedResults. See RFC 2696. Control is defined as:
*
* <pre>
realSearchControlValue ::= SEQUENCE {
size INTEGER (0..maxInt),
-- requested page size from client
-- result set size estimate from server
cookie OCTET STRING
}
* </pre>
*
* @author Middleware Services
*/
public class PagedResultsControl extends AbstractControl implements RequestControl, ResponseControl
{
/** OID of this control. */
public static final String OID = "1.2.840.113556.1.4.319";
/** hash code seed. */
private static final int HASH_CODE_SEED = 709;
/** Empty byte array used for null cookies. */
private static final byte[] EMPTY_COOKIE = new byte[0];
/** paged results size. */
private int resultSize;
/** server generated cookie. */
private byte[] cookie;
/** Default constructor. */
public PagedResultsControl()
{
super(OID);
}
/**
* Creates a new paged results control.
*
* @param critical whether this control is critical
*/
public PagedResultsControl(final boolean critical)
{
super(OID, critical);
}
/**
* Creates a new paged results control.
*
* @param size paged results size
*/
public PagedResultsControl(final int size)
{
super(OID);
setSize(size);
}
/**
* Creates a new paged results control.
*
* @param size paged results size
* @param critical whether this control is critical
*/
public PagedResultsControl(final int size, final boolean critical)
{
super(OID, critical);
setSize(size);
}
/**
* Creates a new paged results control.
*
* @param size paged results size
* @param value paged results cookie
* @param critical whether this control is critical
*/
public PagedResultsControl(final int size, final byte[] value, final boolean critical)
{
super(OID, critical);
setSize(size);
setCookie(value);
}
/**
* Returns the paged results size. For requests this is the requested page size. For responses this is the result size
* estimate from the server.
*
* @return paged results size
*/
public int getSize()
{
return resultSize;
}
/**
* Sets the paged results size. For requests this is the requested page size. For responses this is the result size
* estimate from the server.
*
* @param size paged results size
*/
public void setSize(final int size)
{
resultSize = size;
}
/**
* Returns the paged results cookie.
*
* @return paged results cookie
*/
public byte[] getCookie()
{
return cookie;
}
/**
* Sets the paged results cookie.
*
* @param value paged results cookie
*/
public void setCookie(final byte[] value)
{
cookie = value;
}
@Override
public boolean equals(final Object o)
{
if (o == this) {
return true;
}
if (o instanceof PagedResultsControl && super.equals(o)) {
final PagedResultsControl v = (PagedResultsControl) o;
return LdapUtils.areEqual(resultSize, v.resultSize) &&
LdapUtils.areEqual(cookie, v.cookie);
}
return false;
}
@Override
public int hashCode()
{
return LdapUtils.computeHashCode(HASH_CODE_SEED, getOID(), getCriticality(), resultSize, cookie);
}
@Override
public String toString()
{
return
String.format(
"[%s@%d::criticality=%s, size=%s, cookie=%s]",
getClass().getName(),
hashCode(),
getCriticality(),
resultSize,
LdapUtils.base64Encode(cookie));
}
@Override
public byte[] encode()
{
final ConstructedDEREncoder se = new ConstructedDEREncoder(
UniversalDERTag.SEQ,
new IntegerType(getSize()),
new OctetStringType(getCookie() != null ? getCookie() : EMPTY_COOKIE));
return se.encode();
}
@Override
public void decode(final byte[] berValue)
{
logger.trace("decoding control: {}", LdapUtils.base64Encode(berValue));
final DERParser parser = new DERParser();
parser.registerHandler(SizeHandler.PATH, new SizeHandler(this));
parser.registerHandler(CookieHandler.PATH, new CookieHandler(this));
parser.parse(ByteBuffer.wrap(berValue));
}
/** Parse handler implementation for the size. */
private static class SizeHandler extends AbstractParseHandler<PagedResultsControl>
{
/** DER path to result size. */
public static final DERPath PATH = new DERPath("/SEQ/INT");
/**
* Creates a new size handler.
*
* @param control to configure
*/
SizeHandler(final PagedResultsControl control)
{
super(control);
}
@Override
public void handle(final DERParser parser, final ByteBuffer encoded)
{
getObject().setSize(IntegerType.decode(encoded).intValue());
}
}
/** Parse handler implementation for the cookie. */
private static class CookieHandler extends AbstractParseHandler<PagedResultsControl>
{
/** DER path to cookie value. */
public static final DERPath PATH = new DERPath("/SEQ/OCTSTR");
/**
* Creates a new cookie handler.
*
* @param control to configure
*/
CookieHandler(final PagedResultsControl control)
{
super(control);
}
@Override
public void handle(final DERParser parser, final ByteBuffer encoded)
{
final byte[] cookie = OctetStringType.readBuffer(encoded);
if (cookie != null && cookie.length > 0) {
getObject().setCookie(cookie);
}
}
}
}