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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.ArrayList;
import java.util.Collection;
import com.unboundid.asn1.ASN1Element;
import com.unboundid.asn1.ASN1Exception;
import com.unboundid.asn1.ASN1OctetString;
import com.unboundid.asn1.ASN1Sequence;
import com.unboundid.ldap.sdk.Attribute;
import com.unboundid.ldap.sdk.Control;
import com.unboundid.ldap.sdk.DecodeableControl;
import com.unboundid.ldap.sdk.LDAPException;
import com.unboundid.ldap.sdk.LDAPResult;
import com.unboundid.ldap.sdk.ReadOnlyEntry;
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 LDAP pre-read response control
* as defined in RFC 4527. It
* may be used to return a copy of the target entry immediately before
* processing a delete, modify, or modify DN operation.
*
* If the corresponding delete, modify, or modify DN request included the
* {@link PreReadRequestControl} and the operation was successful, then the
* response for that operation should include the pre-read response control with
* a read-only copy of the entry as it appeared immediately before processing
* the request. If the operation was not successful, then the pre-read response
* control will not be returned.
*/
@NotMutable()
@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
public final class PreReadResponseControl
extends Control
implements DecodeableControl
{
/**
* The OID (1.3.6.1.1.13.1) for the pre-read response control.
*/
public static final String PRE_READ_RESPONSE_OID = "1.3.6.1.1.13.1";
/**
* The serial version UID for this serializable class.
*/
private static final long serialVersionUID = -4719875382095056686L;
// The entry returned in the response control.
private final ReadOnlyEntry entry;
/**
* Creates a new empty control instance that is intended to be used only for
* decoding controls via the {@code DecodeableControl} interface.
*/
PreReadResponseControl()
{
entry = null;
}
/**
* Creates a new pre-read response control including the provided entry.
*
* @param entry The entry to include in this pre-read response control. It
* must not be {@code null}.
*/
public PreReadResponseControl(final ReadOnlyEntry entry)
{
super(PRE_READ_RESPONSE_OID, false, encodeValue(entry));
this.entry = entry;
}
/**
* Creates a new pre-read response control with the provided information.
*
* @param oid The OID for the control.
* @param isCritical Indicates whether the control should be marked
* critical.
* @param value The encoded value for the control. This may be
* {@code null} if no value was provided.
*
* @throws LDAPException If the provided control cannot be decoded as a
* pre-read response control.
*/
public PreReadResponseControl(final String oid, final boolean isCritical,
final ASN1OctetString value)
throws LDAPException
{
super(oid, isCritical, value);
if (value == null)
{
throw new LDAPException(ResultCode.DECODING_ERROR,
ERR_PRE_READ_RESPONSE_NO_VALUE.get());
}
final ASN1Sequence entrySequence;
try
{
final ASN1Element entryElement = ASN1Element.decode(value.getValue());
entrySequence = ASN1Sequence.decodeAsSequence(entryElement);
}
catch (final ASN1Exception ae)
{
debugException(ae);
throw new LDAPException(ResultCode.DECODING_ERROR,
ERR_PRE_READ_RESPONSE_VALUE_NOT_SEQUENCE.get(ae),
ae);
}
final ASN1Element[] entryElements = entrySequence.elements();
if (entryElements.length != 2)
{
throw new LDAPException(ResultCode.DECODING_ERROR,
ERR_PRE_READ_RESPONSE_INVALID_ELEMENT_COUNT.get(
entryElements.length));
}
final String dn =
ASN1OctetString.decodeAsOctetString(entryElements[0]).stringValue();
final ASN1Sequence attrSequence;
try
{
attrSequence = ASN1Sequence.decodeAsSequence(entryElements[1]);
}
catch (final ASN1Exception ae)
{
debugException(ae);
throw new LDAPException(ResultCode.DECODING_ERROR,
ERR_PRE_READ_RESPONSE_ATTRIBUTES_NOT_SEQUENCE.get(ae), ae);
}
final ASN1Element[] attrElements = attrSequence.elements();
final Attribute[] attrs = new Attribute[attrElements.length];
for (int i=0; i < attrElements.length; i++)
{
try
{
attrs[i] =
Attribute.decode(ASN1Sequence.decodeAsSequence(attrElements[i]));
}
catch (final ASN1Exception ae)
{
debugException(ae);
throw new LDAPException(ResultCode.DECODING_ERROR,
ERR_PRE_READ_RESPONSE_ATTR_NOT_SEQUENCE.get(ae), ae);
}
}
entry = new ReadOnlyEntry(dn, attrs);
}
/**
* {@inheritDoc}
*/
public PreReadResponseControl
decodeControl(final String oid, final boolean isCritical,
final ASN1OctetString value)
throws LDAPException
{
return new PreReadResponseControl(oid, isCritical, value);
}
/**
* Extracts a pre-read response control from the provided result.
*
* @param result The result from which to retrieve the pre-read response
* control.
*
* @return The pre-read response control contained in the provided result, or
* {@code null} if the result did not contain a pre-read response
* control.
*
* @throws LDAPException If a problem is encountered while attempting to
* decode the pre-read response control contained in
* the provided result.
*/
public static PreReadResponseControl get(final LDAPResult result)
throws LDAPException
{
final Control c = result.getResponseControl(PRE_READ_RESPONSE_OID);
if (c == null)
{
return null;
}
if (c instanceof PreReadResponseControl)
{
return (PreReadResponseControl) c;
}
else
{
return new PreReadResponseControl(c.getOID(), c.isCritical(),
c.getValue());
}
}
/**
* Encodes the provided information into an octet string that can be used as
* the value for this control.
*
* @param entry The entry to include in this pre-read response control. It
* must not be {@code null}.
*
* @return An ASN.1 octet string that can be used as the value for this
* control.
*/
private static ASN1OctetString encodeValue(final ReadOnlyEntry entry)
{
ensureNotNull(entry);
final Collection attrs = entry.getAttributes();
final ArrayList attrElements =
new ArrayList(attrs.size());
for (final Attribute a : attrs)
{
attrElements.add(a.encode());
}
final ASN1Element[] entryElements =
{
new ASN1OctetString(entry.getDN()),
new ASN1Sequence(attrElements)
};
return new ASN1OctetString(new ASN1Sequence(entryElements).encode());
}
/**
* Retrieves a read-only copy of the entry returned by this post-read response
* control.
*
* @return A read-only copy of the entry returned by this post-read response
* control.
*/
public ReadOnlyEntry getEntry()
{
return entry;
}
/**
* {@inheritDoc}
*/
@Override()
public String getControlName()
{
return INFO_CONTROL_NAME_PRE_READ_RESPONSE.get();
}
/**
* {@inheritDoc}
*/
@Override()
public void toString(final StringBuilder buffer)
{
buffer.append("PreReadResponseControl(entry=");
entry.toString(buffer);
buffer.append(", isCritical=");
buffer.append(isCritical());
buffer.append(')');
}
}
