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/*
* Copyright 2007-2017 UnboundID Corp.
* All Rights Reserved.
*/
/*
* Copyright (C) 2008-2017 UnboundID Corp.
*
* 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.EnumSet;
import java.util.Iterator;
import java.util.Set;
import com.unboundid.asn1.ASN1Boolean;
import com.unboundid.asn1.ASN1Element;
import com.unboundid.asn1.ASN1Integer;
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.NotMutable;
import com.unboundid.util.ThreadSafety;
import com.unboundid.util.ThreadSafetyLevel;
import static com.unboundid.ldap.sdk.controls.ControlMessages.*;
import static com.unboundid.util.Debug.*;
import static com.unboundid.util.Validator.*;
/**
* This class provides an implementation of the persistent search request
* control as defined in draft-ietf-ldapext-psearch. It may be included in a
* search request to request notification for changes to entries that match the
* associated set of search criteria. It can provide a basic mechanism for
* clients to request to be notified whenever entries matching the associated
* search criteria are altered.
*
* A persistent search request control may include the following elements:
*
*
{@code changeTypes} -- Specifies the set of change types for which to
* receive notification. This may be any combination of one or more of
* the {@link PersistentSearchChangeType} values.
*
{@code changesOnly} -- Indicates whether to only return updated entries
* that match the associated search criteria. If this is {@code false},
* then the server will first return all existing entries in the server
* that match the search criteria, and will then begin returning entries
* that are updated in an operation associated with one of the
* registered {@code changeTypes}. If this is {@code true}, then the
* server will not return all matching entries that already exist in the
* server but will only return entries in response to changes that
* occur.
*
{@code returnECs} -- Indicates whether search result entries returned
* as a result of a change to the directory data should include the
* {@link EntryChangeNotificationControl} to provide information about
* the type of operation that occurred. If {@code changesOnly} is
* {@code false}, then entry change notification controls will not be
* included in existing entries that match the search criteria, but only
* in entries that are updated by an operation with one of the registered
* {@code changeTypes}.
*
* Note that when an entry is returned in response to a persistent search
* request, the content of the entry that is returned will reflect the updated
* entry in the server (except in the case of a delete operation, in which case
* it will be the entry as it appeared before it was removed). Other than the
* information included in the entry change notification control, the search
* result entry will not contain any information about what actually changed in
* the entry.
*
* Many servers do not enforce time limit or size limit restrictions on the
* persistent search control, and because there is no defined "end" to the
* search, it may remain active until the client abandons or cancels the search
* or until the connection is closed. Because of this, it is strongly
* recommended that clients only use the persistent search request control in
* conjunction with asynchronous search operations invoked using the
* {@link com.unboundid.ldap.sdk.LDAPConnection#asyncSearch} method.
*
*
Example
* The following example demonstrates the process for beginning an asynchronous
* search that includes the persistent search control in order to notify the
* client of all changes to entries within the "dc=example,dc=com" subtree.
*
* SearchRequest persistentSearchRequest = new SearchRequest(
* asyncSearchListener, "dc=example,dc=com", SearchScope.SUB,
* Filter.createPresenceFilter("objectClass"));
* persistentSearchRequest.addControl(new PersistentSearchRequestControl(
* PersistentSearchChangeType.allChangeTypes(), // Notify change types.
* true, // Only return new changes, don't match existing entries.
* true)); // Include change notification controls in search entries.
*
* // Launch the persistent search as an asynchronous operation.
* AsyncRequestID persistentSearchRequestID =
* connection.asyncSearch(persistentSearchRequest);
*
* // Modify an entry that matches the persistent search criteria. This
* // should cause the persistent search listener to be notified.
* LDAPResult modifyResult = connection.modify(
* "uid=test.user,ou=People,dc=example,dc=com",
* new Modification(ModificationType.REPLACE, "description", "test"));
*
* // Verify that the persistent search listener was notified....
*
* // Since persistent search operations don't end on their own, we need to
* // abandon the search when we don't need it anymore.
* connection.abandon(persistentSearchRequestID);
*
*/
@NotMutable()
@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
public final class PersistentSearchRequestControl
extends Control
{
/**
* The OID (2.16.840.1.113730.3.4.3) for the persistent search request
* control.
*/
public static final String PERSISTENT_SEARCH_REQUEST_OID =
"2.16.840.1.113730.3.4.3";
/**
* The serial version UID for this serializable class.
*/
private static final long serialVersionUID = 3532762682521779027L;
// Indicates whether the search should only return search result entries for
// changes made to entries matching the search criteria, or if existing
// entries already in the server should be returned as well.
private final boolean changesOnly;
// Indicates whether search result entries returned as part of this persistent
// search should include the entry change notification control.
private final boolean returnECs;
// The set of change types for which this persistent search control is
// registered.
private final EnumSet changeTypes;
/**
* Creates a new persistent search control with the provided information. It
* will be marked critical.
*
* @param changeType The change type for which to register. It must not be
* {@code null}.
* @param changesOnly Indicates whether the search should only return search
* result entries for changes made to entries matching
* the search criteria, or if existing matching entries
* in the server should be returned as well.
* @param returnECs Indicates whether the search result entries returned
* as part of this persistent search should include the
* entry change notification control.
*/
public PersistentSearchRequestControl(
final PersistentSearchChangeType changeType,
final boolean changesOnly, final boolean returnECs)
{
super(PERSISTENT_SEARCH_REQUEST_OID, true,
encodeValue(changeType, changesOnly, returnECs));
changeTypes = EnumSet.of(changeType);
this.changesOnly = changesOnly;
this.returnECs = returnECs;
}
/**
* Creates a new persistent search control with the provided information. It
* will be marked critical.
*
* @param changeTypes The set of change types for which to register. It
* must not be {@code null} or empty.
* @param changesOnly Indicates whether the search should only return search
* result entries for changes made to entries matching
* the search criteria, or if existing matching entries
* in the server should be returned as well.
* @param returnECs Indicates whether the search result entries returned
* as part of this persistent search should include the
* entry change notification control.
*/
public PersistentSearchRequestControl(
final Set changeTypes,
final boolean changesOnly, final boolean returnECs)
{
super(PERSISTENT_SEARCH_REQUEST_OID, true,
encodeValue(changeTypes, changesOnly, returnECs));
this.changeTypes = EnumSet.copyOf(changeTypes);
this.changesOnly = changesOnly;
this.returnECs = returnECs;
}
/**
* Creates a new persistent search control with the provided information.
*
* @param changeType The change type for which to register. It must not be
* {@code null}.
* @param changesOnly Indicates whether the search should only return search
* result entries for changes made to entries matching
* the search criteria, or if existing matching entries
* in the server should be returned as well.
* @param returnECs Indicates whether the search result entries returned
* as part of this persistent search should include the
* entry change notification control.
* @param isCritical Indicates whether the control should be marked
* critical.
*/
public PersistentSearchRequestControl(
final PersistentSearchChangeType changeType,
final boolean changesOnly, final boolean returnECs,
final boolean isCritical)
{
super(PERSISTENT_SEARCH_REQUEST_OID, isCritical,
encodeValue(changeType, changesOnly, returnECs));
changeTypes = EnumSet.of(changeType);
this.changesOnly = changesOnly;
this.returnECs = returnECs;
}
/**
* Creates a new persistent search control with the provided information.
*
* @param changeTypes The set of change types for which to register. It
* must not be {@code null} or empty.
* @param changesOnly Indicates whether the search should only return search
* result entries for changes made to entries matching
* the search criteria, or if existing matching entries
* in the server should be returned as well.
* @param returnECs Indicates whether the search result entries returned
* as part of this persistent search should include the
* entry change notification control.
* @param isCritical Indicates whether the control should be marked
* critical.
*/
public PersistentSearchRequestControl(
final Set changeTypes,
final boolean changesOnly, final boolean returnECs,
final boolean isCritical)
{
super(PERSISTENT_SEARCH_REQUEST_OID, isCritical,
encodeValue(changeTypes, changesOnly, returnECs));
this.changeTypes = EnumSet.copyOf(changeTypes);
this.changesOnly = changesOnly;
this.returnECs = returnECs;
}
/**
* Creates a new persistent search request control which is decoded from the
* provided generic control.
*
* @param control The generic control to be decoded as a persistent search
* request control.
*
* @throws LDAPException If the provided control cannot be decoded as a
* persistent search request control.
*/
public PersistentSearchRequestControl(final Control control)
throws LDAPException
{
super(control);
final ASN1OctetString value = control.getValue();
if (value == null)
{
throw new LDAPException(ResultCode.DECODING_ERROR,
ERR_PSEARCH_NO_VALUE.get());
}
try
{
final ASN1Element valueElement = ASN1Element.decode(value.getValue());
final ASN1Element[] elements =
ASN1Sequence.decodeAsSequence(valueElement).elements();
changeTypes =
EnumSet.copyOf(PersistentSearchChangeType.decodeChangeTypes(
ASN1Integer.decodeAsInteger(elements[0]).intValue()));
changesOnly = ASN1Boolean.decodeAsBoolean(elements[1]).booleanValue();
returnECs = ASN1Boolean.decodeAsBoolean(elements[2]).booleanValue();
}
catch (Exception e)
{
debugException(e);
throw new LDAPException(ResultCode.DECODING_ERROR,
ERR_PSEARCH_CANNOT_DECODE.get(e), e);
}
}
/**
* Encodes the provided information into an octet string that can be used as
* the value for this control.
*
* @param changeType The change type for which to register. It must not be
* {@code null}.
* @param changesOnly Indicates whether the search should only return search
* result entries for changes made to entries matching
* the search criteria, or if existing matching entries
* in the server should be returned as well.
* @param returnECs Indicates whether the search result entries returned
* as part of this persistent search should include the
* entry change notification control.
*
* @return An ASN.1 octet string that can be used as the value for this
* control.
*/
private static ASN1OctetString encodeValue(
final PersistentSearchChangeType changeType,
final boolean changesOnly, final boolean returnECs)
{
ensureNotNull(changeType);
final ASN1Element[] elements =
{
new ASN1Integer(changeType.intValue()),
new ASN1Boolean(changesOnly),
new ASN1Boolean(returnECs)
};
return new ASN1OctetString(new ASN1Sequence(elements).encode());
}
/**
* Encodes the provided information into an octet string that can be used as
* the value for this control.
*
* @param changeTypes The set of change types for which to register. It
* must not be {@code null} or empty.
* @param changesOnly Indicates whether the search should only return search
* result entries for changes made to entries matching
* the search criteria, or if existing matching entries
* in the server should be returned as well.
* @param returnECs Indicates whether the search result entries returned
* as part of this persistent search should include the
* entry change notification control.
*
* @return An ASN.1 octet string that can be used as the value for this
* control.
*/
private static ASN1OctetString encodeValue(
final Set changeTypes,
final boolean changesOnly, final boolean returnECs)
{
ensureNotNull(changeTypes);
ensureFalse(changeTypes.isEmpty(),
"PersistentSearchRequestControl.changeTypes must not be empty.");
final ASN1Element[] elements =
{
new ASN1Integer(
PersistentSearchChangeType.encodeChangeTypes(changeTypes)),
new ASN1Boolean(changesOnly),
new ASN1Boolean(returnECs)
};
return new ASN1OctetString(new ASN1Sequence(elements).encode());
}
/**
* Retrieves the set of change types for this persistent search request
* control.
*
* @return The set of change types for this persistent search request
* control.
*/
public Set getChangeTypes()
{
return changeTypes;
}
/**
* Indicates whether the search should only return search result entries for
* changes made to entries matching the search criteria, or if existing
* matching entries should be returned as well.
*
* @return {@code true} if the search should only return search result
* entries for changes matching the search criteria, or {@code false}
* if it should also return existing entries that match the search
* criteria.
*/
public boolean changesOnly()
{
return changesOnly;
}
/**
* Indicates whether the search result entries returned as part of this
* persistent search should include the entry change notification control.
*
* @return {@code true} if search result entries returned as part of this
* persistent search should include the entry change notification
* control, or {@code false} if not.
*/
public boolean returnECs()
{
return returnECs;
}
/**
* {@inheritDoc}
*/
@Override()
public String getControlName()
{
return INFO_CONTROL_NAME_PSEARCH_REQUEST.get();
}
/**
* {@inheritDoc}
*/
@Override()
public void toString(final StringBuilder buffer)
{
buffer.append("PersistentSearchRequestControl(changeTypes={");
final Iterator iterator =
changeTypes.iterator();
while (iterator.hasNext())
{
buffer.append(iterator.next().getName());
if (iterator.hasNext())
{
buffer.append(", ");
}
}
buffer.append("}, changesOnly=");
buffer.append(changesOnly);
buffer.append(", returnECs=");
buffer.append(returnECs);
buffer.append(", isCritical=");
buffer.append(isCritical());
buffer.append(')');
}
}
