/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2006-2008 Sun Microsystems, Inc.
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*/
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package org.opends.server.controls;
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import org.opends.messages.Message;
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import java.util.ArrayList;
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import org.opends.server.protocols.asn1.ASN1Constants;
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import org.opends.server.protocols.asn1.ASN1Element;
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import org.opends.server.protocols.asn1.ASN1Enumerated;
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import org.opends.server.protocols.asn1.ASN1Long;
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import org.opends.server.protocols.asn1.ASN1OctetString;
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import org.opends.server.protocols.asn1.ASN1Sequence;
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import org.opends.server.protocols.ldap.LDAPResultCode;
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import org.opends.server.types.Control;
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import org.opends.server.types.DN;
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import org.opends.server.types.DebugLogLevel;
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import org.opends.server.types.LDAPException;
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import static org.opends.server.loggers.debug.DebugLogger.*;
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import org.opends.server.loggers.debug.DebugTracer;
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import static org.opends.messages.ProtocolMessages.*;
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import static org.opends.server.util.ServerConstants.*;
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import static org.opends.server.util.StaticUtils.*;
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/**
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* This class implements the entry change notification control defined in
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* draft-ietf-ldapext-psearch. It may be included in entries returned in
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* response to a persistent search operation.
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*/
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public class EntryChangeNotificationControl
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extends Control
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{
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/**
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* The tracer object for the debug logger.
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*/
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private static final DebugTracer TRACER = getTracer();
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// The previous DN for this change notification control.
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private DN previousDN;
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// The change number for this change notification control.
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private long changeNumber;
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// The change type for this change notification control.
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private PersistentSearchChangeType changeType;
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/**
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* Creates a new entry change notification control with the provided
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* information.
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*
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* @param changeType The change type for this change notification control.
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* @param changeNumber The change number for the associated change, or a
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* negative value if no change number is available.
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*/
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public EntryChangeNotificationControl(PersistentSearchChangeType changeType,
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long changeNumber)
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{
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super(OID_ENTRY_CHANGE_NOTIFICATION, false,
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encodeValue(changeType, null, changeNumber));
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this.changeType = changeType;
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this.changeNumber = changeNumber;
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previousDN = null;
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}
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/**
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* Creates a new entry change notification control with the provided
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* information.
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*
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* @param changeType The change type for this change notification control.
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* @param previousDN The DN that the entry had prior to a modify DN
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* operation, or <CODE>null</CODE> if the operation was
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* not a modify DN.
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* @param changeNumber The change number for the associated change, or a
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* negative value if no change number is available.
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*/
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public EntryChangeNotificationControl(PersistentSearchChangeType changeType,
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DN previousDN, long changeNumber)
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{
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super(OID_ENTRY_CHANGE_NOTIFICATION, false,
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encodeValue(changeType, previousDN, changeNumber));
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this.changeType = changeType;
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this.previousDN = previousDN;
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this.changeNumber = changeNumber;
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}
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/**
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* Creates a new entry change notification control with the provided
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* information.
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*
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* @param oid The OID to use for this control.
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* @param isCritical Indicates whether this control should be considered
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* critical to the operation processing.
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* @param changeType The change type for this change notification control.
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* @param previousDN The DN that the entry had prior to a modify DN
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* operation, or <CODE>null</CODE> if the operation was
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* not a modify DN.
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* @param changeNumber The change number for the associated change, or a
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* negative value if no change number is available.
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*/
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public EntryChangeNotificationControl(String oid, boolean isCritical,
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PersistentSearchChangeType changeType,
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DN previousDN, long changeNumber)
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{
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super(oid, isCritical, encodeValue(changeType, previousDN, changeNumber));
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this.changeType = changeType;
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this.previousDN = previousDN;
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this.changeNumber = changeNumber;
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}
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/**
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* Creates a new entry change notification control with the provided
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* information.
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*
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* @param oid The OID to use for this control.
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* @param isCritical Indicates whether this control should be considered
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* critical to the operation processing.
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* @param changeType The change type for this change notification control.
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* @param previousDN The DN that the entry had prior to a modify DN
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* operation, or <CODE>null</CODE> if the operation was
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* not a modify DN.
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* @param changeNumber The change number for the associated change, or a
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* negative value if no change number is available.
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* @param encodedValue The pre-encoded value for this change notification
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* control.
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*/
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private EntryChangeNotificationControl(String oid, boolean isCritical,
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PersistentSearchChangeType changeType,
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DN previousDN, long changeNumber,
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ASN1OctetString encodedValue)
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{
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super(oid, isCritical, encodedValue);
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this.changeType = changeType;
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this.previousDN = previousDN;
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this.changeNumber = changeNumber;
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}
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/**
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* Encodes the provided information into an ASN.1 octet string suitable for
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* use as the control value.
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*
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* @param changeType The change type for this change notification control.
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* @param previousDN The DN that the entry had prior to a modify DN
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* operation, or <CODE>null</CODE> if the operation was
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* not a modify DN.
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* @param changeNumber The change number for the associated change, or a
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* negative value if no change number is available.
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*
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* @return An ASN.1 octet string containing the encoded information.
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*/
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private static ASN1OctetString encodeValue(PersistentSearchChangeType
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changeType,
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DN previousDN, long changeNumber)
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{
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ArrayList<ASN1Element> elements =
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new ArrayList<ASN1Element>(3);
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elements.add(new ASN1Enumerated(changeType.intValue()));
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if (previousDN != null)
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{
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elements.add(new ASN1OctetString(previousDN.toString()));
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}
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if (changeNumber > 0)
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{
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elements.add(new ASN1Long(changeNumber));
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}
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return new ASN1OctetString(new ASN1Sequence(elements).encode());
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}
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/**
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* Creates a new entry change notification control from the contents of the
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* provided control.
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*
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* @param control The generic control containing the information to use to
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* create this entry change notification control.
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*
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* @return The entry change notification control decoded from the provided
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* control.
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*
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* @throws LDAPException If this control cannot be decoded as a valid
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* entry change notification control.
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*/
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public static EntryChangeNotificationControl decodeControl(Control control)
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throws LDAPException
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{
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if (! control.hasValue())
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{
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Message message = ERR_ECN_NO_CONTROL_VALUE.get();
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throw new LDAPException(LDAPResultCode.PROTOCOL_ERROR, message);
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}
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DN previousDN = null;
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long changeNumber = -1;
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PersistentSearchChangeType changeType;
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try
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{
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ArrayList<ASN1Element> elements =
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ASN1Sequence.decodeAsSequence(control.getValue().value()).elements();
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if ((elements.size() < 1) || (elements.size() > 3))
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{
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Message message = ERR_ECN_INVALID_ELEMENT_COUNT.get(elements.size());
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throw new LDAPException(LDAPResultCode.PROTOCOL_ERROR, message);
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}
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int changeTypeValue = elements.get(0).decodeAsEnumerated().intValue();
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changeType = PersistentSearchChangeType.valueOf(changeTypeValue);
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if (elements.size() == 2)
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{
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ASN1Element e = elements.get(1);
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if (e.getType() == ASN1Constants.UNIVERSAL_OCTET_STRING_TYPE)
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{
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if (changeType != PersistentSearchChangeType.MODIFY_DN)
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{
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Message message =
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ERR_ECN_ILLEGAL_PREVIOUS_DN.get(String.valueOf(changeType));
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throw new LDAPException(LDAPResultCode.PROTOCOL_ERROR, message);
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}
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ASN1OctetString rawPreviousDN = e.decodeAsOctetString();
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previousDN = DN.decode(rawPreviousDN);
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}
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else if (e.getType() == ASN1Constants.UNIVERSAL_INTEGER_TYPE)
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{
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changeNumber = e.decodeAsLong().longValue();
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}
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else
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{
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Message message =
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ERR_ECN_INVALID_ELEMENT_TYPE.get(byteToHex(e.getType()));
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throw new LDAPException(LDAPResultCode.PROTOCOL_ERROR, message);
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}
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}
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else if (elements.size() == 3)
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{
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if (changeType != PersistentSearchChangeType.MODIFY_DN)
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{
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Message message =
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ERR_ECN_ILLEGAL_PREVIOUS_DN.get(String.valueOf(changeType));
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throw new LDAPException(LDAPResultCode.PROTOCOL_ERROR, message);
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}
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ASN1OctetString rawPreviousDN = elements.get(1).decodeAsOctetString();
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previousDN = DN.decode(rawPreviousDN);
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changeNumber = elements.get(2).decodeAsLong().longValue();
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}
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}
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catch (LDAPException le)
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{
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throw le;
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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Message message = ERR_ECN_CANNOT_DECODE_VALUE.get(getExceptionMessage(e));
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throw new LDAPException(LDAPResultCode.PROTOCOL_ERROR, message, e);
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}
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return new EntryChangeNotificationControl(control.getOID(),
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control.isCritical(), changeType,
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previousDN, changeNumber,
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control.getValue());
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}
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/**
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* Retrieves the change type for this entry change notification control.
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*
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* @return The change type for this entry change notification control.
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*/
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public PersistentSearchChangeType getChangeType()
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{
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return changeType;
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}
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/**
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* Sets the change type for this entry change notification control.
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*
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* @param changeType The change type for this entry change notification
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* control.
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*/
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public void setChangeType(PersistentSearchChangeType changeType)
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{
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this.changeType = changeType;
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setValue(encodeValue(changeType, previousDN, changeNumber));
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}
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/**
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* Retrieves the previous DN for this entry change notification control.
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*
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* @return The previous DN for this entry change notification control, or
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* <CODE>null</CODE> if there is none.
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*/
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public DN getPreviousDN()
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{
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return previousDN;
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}
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/**
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* Specifies the previous DN for this entry change notification control.
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*
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* @param previousDN The previous DN for this entry change notification
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* control.
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*/
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public void setPreviousDN(DN previousDN)
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{
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this.previousDN = previousDN;
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setValue(encodeValue(changeType, previousDN, changeNumber));
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}
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/**
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* Retrieves the change number for this entry change notification control.
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*
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* @return The change number for this entry change notification control, or a
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* negative value if no change number is available.
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*/
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public long getChangeNumber()
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{
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return changeNumber;
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}
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/**
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* Specifies the change number for this entry change notification control.
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*
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* @param changeNumber The change number for this entry change notification
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* control.
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*/
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public void setChangeNumber(long changeNumber)
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{
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this.changeNumber = changeNumber;
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setValue(encodeValue(changeType, previousDN, changeNumber));
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}
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/**
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* Retrieves a string representation of this entry change notification
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* control.
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*
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* @return A string representation of this entry change notification control.
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*/
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public String toString()
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{
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StringBuilder buffer = new StringBuilder();
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toString(buffer);
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return buffer.toString();
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}
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/**
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* Appends a string representation of this entry change notification control
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* to the provided buffer.
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*
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* @param buffer The buffer to which the information should be appended.
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*/
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public void toString(StringBuilder buffer)
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{
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buffer.append("EntryChangeNotificationControl(changeType=");
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buffer.append(changeType.toString());
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if (previousDN != null)
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{
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buffer.append(",previousDN=\"");
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buffer.append(previousDN.toString());
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buffer.append("\"");
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}
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if (changeNumber > 0)
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{
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buffer.append(",changeNumber=");
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buffer.append(changeNumber);
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}
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buffer.append(")");
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}
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}
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