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/*
* Copyright 2007-2019 Ping Identity Corporation
* All Rights Reserved.
*/
/*
* Copyright (C) 2008-2019 Ping Identity Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (GPLv2 only)
* or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see .
*/
package com.unboundid.ldap.sdk.controls;
import java.util.List;
import com.unboundid.asn1.ASN1Element;
import com.unboundid.asn1.ASN1OctetString;
import com.unboundid.asn1.ASN1Sequence;
import com.unboundid.ldap.sdk.Control;
import com.unboundid.ldap.sdk.LDAPException;
import com.unboundid.ldap.sdk.ResultCode;
import com.unboundid.util.Debug;
import com.unboundid.util.NotMutable;
import com.unboundid.util.ThreadSafety;
import com.unboundid.util.ThreadSafetyLevel;
import com.unboundid.util.Validator;
import static com.unboundid.ldap.sdk.controls.ControlMessages.*;
/**
* This class provides an implementation of the server-side sort request
* control, as defined in
* RFC 2891. It may be
* included in a search request to indicate that the server should sort the
* results before returning them to the client.
*
* The order in which the entries are to be sorted is specified by one or more
* {@link SortKey} values. Each sort key includes an attribute name and a flag
* that indicates whether to sort in ascending or descending order. It may also
* specify a custom matching rule that should be used to specify which logic
* should be used to perform the sorting.
*
* If the search is successful, then the search result done message may include
* the {@link ServerSideSortResponseControl} to provide information about the
* status of the sort processing.
*
*
Example
* The following example demonstrates the use of the server-side sort controls
* to retrieve users in different sort orders.
*
* // Perform a search to get all user entries sorted by last name, then by
* // first name, both in ascending order.
* SearchRequest searchRequest = new SearchRequest(
* "ou=People,dc=example,dc=com", SearchScope.SUB,
* Filter.createEqualityFilter("objectClass", "person"));
* searchRequest.addControl(new ServerSideSortRequestControl(
* new SortKey("sn"), new SortKey("givenName")));
* SearchResult lastNameAscendingResult;
* try
* {
* lastNameAscendingResult = connection.search(searchRequest);
* // If we got here, then the search was successful.
* }
* catch (LDAPSearchException lse)
* {
* // The search failed for some reason.
* lastNameAscendingResult = lse.getSearchResult();
* ResultCode resultCode = lse.getResultCode();
* String errorMessageFromServer = lse.getDiagnosticMessage();
* }
*
* // Get the response control and retrieve the result code for the sort
* // processing.
* LDAPTestUtils.assertHasControl(lastNameAscendingResult,
* ServerSideSortResponseControl.SERVER_SIDE_SORT_RESPONSE_OID);
* ServerSideSortResponseControl lastNameAscendingResponseControl =
* ServerSideSortResponseControl.get(lastNameAscendingResult);
* ResultCode lastNameSortResult =
* lastNameAscendingResponseControl.getResultCode();
*
*
* // Perform the same search, but this time request the results to be sorted
* // in descending order by first name, then last name.
* searchRequest.setControls(new ServerSideSortRequestControl(
* new SortKey("givenName", true), new SortKey("sn", true)));
* SearchResult firstNameDescendingResult;
* try
* {
* firstNameDescendingResult = connection.search(searchRequest);
* // If we got here, then the search was successful.
* }
* catch (LDAPSearchException lse)
* {
* // The search failed for some reason.
* firstNameDescendingResult = lse.getSearchResult();
* ResultCode resultCode = lse.getResultCode();
* String errorMessageFromServer = lse.getDiagnosticMessage();
* }
*
* // Get the response control and retrieve the result code for the sort
* // processing.
* LDAPTestUtils.assertHasControl(firstNameDescendingResult,
* ServerSideSortResponseControl.SERVER_SIDE_SORT_RESPONSE_OID);
* ServerSideSortResponseControl firstNameDescendingResponseControl =
* ServerSideSortResponseControl.get(firstNameDescendingResult);
* ResultCode firstNameSortResult =
* firstNameDescendingResponseControl.getResultCode();
*
*
*
Client-Side Sorting
* The UnboundID LDAP SDK for Java provides support for client-side sorting as
* an alternative to server-side sorting. Client-side sorting may be useful in
* cases in which the target server does not support the use of the server-side
* sort control, or when it is desirable to perform the sort processing on the
* client systems rather than on the directory server systems. See the
* {@link com.unboundid.ldap.sdk.EntrySorter} class for details on performing
* client-side sorting in the LDAP SDK.
*/
@NotMutable()
@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
public final class ServerSideSortRequestControl
extends Control
{
/**
* The OID (1.2.840.113556.1.4.473) for the server-side sort request control.
*/
public static final String SERVER_SIDE_SORT_REQUEST_OID =
"1.2.840.113556.1.4.473";
/**
* The serial version UID for this serializable class.
*/
private static final long serialVersionUID = -3021901578330574772L;
// The set of sort keys to use with this control.
private final SortKey[] sortKeys;
/**
* Creates a new server-side sort control that will sort the results based on
* the provided set of sort keys.
*
* @param sortKeys The set of sort keys to define the desired order in which
* the results should be returned. It must not be
* {@code null} or empty.
*/
public ServerSideSortRequestControl(final SortKey... sortKeys)
{
this(false, sortKeys);
}
/**
* Creates a new server-side sort control that will sort the results based on
* the provided set of sort keys.
*
* @param sortKeys The set of sort keys to define the desired order in which
* the results should be returned. It must not be
* {@code null} or empty.
*/
public ServerSideSortRequestControl(final List sortKeys)
{
this(false, sortKeys);
}
/**
* Creates a new server-side sort control that will sort the results based on
* the provided set of sort keys.
*
* @param isCritical Indicates whether this control should be marked
* critical.
* @param sortKeys The set of sort keys to define the desired order in
* which the results should be returned. It must not be
* {@code null} or empty.
*/
public ServerSideSortRequestControl(final boolean isCritical,
final SortKey... sortKeys)
{
super(SERVER_SIDE_SORT_REQUEST_OID, isCritical, encodeValue(sortKeys));
this.sortKeys = sortKeys;
}
/**
* Creates a new server-side sort control that will sort the results based on
* the provided set of sort keys.
*
* @param isCritical Indicates whether this control should be marked
* critical.
* @param sortKeys The set of sort keys to define the desired order in
* which the results should be returned. It must not be
* {@code null} or empty.
*/
public ServerSideSortRequestControl(final boolean isCritical,
final List sortKeys)
{
this(isCritical, sortKeys.toArray(new SortKey[sortKeys.size()]));
}
/**
* Creates a new server-side sort request control which is decoded from the
* provided generic control.
*
* @param control The generic control to be decoded as a server-side sort
* request control.
*
* @throws LDAPException If the provided control cannot be decoded as a
* server-side sort request control.
*/
public ServerSideSortRequestControl(final Control control)
throws LDAPException
{
super(control);
final ASN1OctetString value = control.getValue();
if (value == null)
{
throw new LDAPException(ResultCode.DECODING_ERROR,
ERR_SORT_REQUEST_NO_VALUE.get());
}
try
{
final ASN1Element valueElement = ASN1Element.decode(value.getValue());
final ASN1Element[] elements =
ASN1Sequence.decodeAsSequence(valueElement).elements();
sortKeys = new SortKey[elements.length];
for (int i=0; i < elements.length; i++)
{
sortKeys[i] = SortKey.decode(elements[i]);
}
}
catch (final Exception e)
{
Debug.debugException(e);
throw new LDAPException(ResultCode.DECODING_ERROR,
ERR_SORT_REQUEST_CANNOT_DECODE.get(e), e);
}
}
/**
* Encodes the provided information into an octet string that can be used as
* the value for this control.
*
* @param sortKeys The set of sort keys to define the desired order in which
* the results should be returned. It must not be
* {@code null} or empty.
*
* @return An ASN.1 octet string that can be used as the value for this
* control.
*/
private static ASN1OctetString encodeValue(final SortKey[] sortKeys)
{
Validator.ensureNotNull(sortKeys);
Validator.ensureTrue(sortKeys.length > 0,
"ServerSideSortRequestControl.sortKeys must not be empty.");
final ASN1Element[] valueElements = new ASN1Element[sortKeys.length];
for (int i=0; i < sortKeys.length; i++)
{
valueElements[i] = sortKeys[i].encode();
}
return new ASN1OctetString(new ASN1Sequence(valueElements).encode());
}
/**
* Retrieves the set of sort keys that define the desired order in which the
* results should be returned.
*
* @return The set of sort keys that define the desired order in which the
* results should be returned.
*/
public SortKey[] getSortKeys()
{
return sortKeys;
}
/**
* {@inheritDoc}
*/
@Override()
public String getControlName()
{
return INFO_CONTROL_NAME_SORT_REQUEST.get();
}
/**
* {@inheritDoc}
*/
@Override()
public void toString(final StringBuilder buffer)
{
buffer.append("ServerSideSortRequestControl(sortKeys={");
for (int i=0; i < sortKeys.length; i++)
{
if (i > 0)
{
buffer.append(", ");
}
buffer.append('\'');
sortKeys[i].toString(buffer);
buffer.append('\'');
}
buffer.append("})");
}
}
