/*
 * The contents of this file are subject to the terms of the Common Development and
 * Distribution License (the License). You may not use this file except in compliance with the
 * License.
 *
 * You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
 * specific language governing permission and limitations under the License.
 *
 * When distributing Covered Software, include this CDDL Header Notice in each file and include
 * the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
 * Header, with the fields enclosed by brackets [] replaced by your own identifying
 * information: "Portions Copyright [year] [name of copyright owner]".
 *
 * Copyright 2009 Sun Microsystems, Inc.
 * Portions Copyright 2014-2016 ForgeRock AS.
 */
package org.opends.server.controls;
import org.forgerock.i18n.LocalizableMessage;

import java.io.IOException;

import org.forgerock.opendj.io.*;
import org.forgerock.i18n.slf4j.LocalizedLogger;
import org.opends.server.types.*;
import org.forgerock.opendj.ldap.ResultCode;
import org.forgerock.opendj.ldap.ByteString;
import static org.opends.messages.ProtocolMessages.*;
import static org.opends.server.util.ServerConstants.*;
import static org.opends.server.util.StaticUtils.*;

/**
 * This class implements Subentries Control as defined in RFC 3672. It makes
 * it possible to control the visibility of entries and subentries which are
 * within scope of specific operation.
 */
public class SubentriesControl
       extends Control
{
  /** ControlDecoder implementation to decode this control from a ByteString. */
  private static final class Decoder
      implements ControlDecoder<SubentriesControl>
  {
    @Override
    public SubentriesControl decode(boolean isCritical, ByteString value)
        throws DirectoryException
    {
      if (value == null)
      {
        LocalizableMessage message = ERR_SUBENTRIES_NO_CONTROL_VALUE.get();
        throw new DirectoryException(ResultCode.PROTOCOL_ERROR, message);
      }

      ASN1Reader reader = ASN1.getReader(value);
      boolean visibility;
      try
      {
        visibility = reader.readBoolean();
      }
      catch (Exception e)
      {
        logger.traceException(e);

        LocalizableMessage message =
            ERR_SUBENTRIES_CANNOT_DECODE_VALUE.get(getExceptionMessage(e));
        throw new DirectoryException(ResultCode.PROTOCOL_ERROR, message, e);
      }

      return new SubentriesControl(isCritical, visibility);
    }

    @Override
    public String getOID()
    {
      return OID_LDAP_SUBENTRIES;
    }

  }

  /** The Control Decoder that can be used to decode this control. */
  public static final ControlDecoder<SubentriesControl> DECODER =
    new Decoder();
  private static final LocalizedLogger logger = LocalizedLogger.getLoggerForThisClass();

  /** The visibility from the control value. */
  private boolean visibility;

  /**
   * Creates a new instance of the Subentries Control with the provided
   * information.
   *
   * @param  isCritical       Indicates whether support for this control
   *                          should be considered a critical part of the
   *                          server processing.
   * @param  visibility       The visibility flag from the control value.
   */
  public SubentriesControl(boolean isCritical, boolean visibility)
  {
    super(OID_LDAP_SUBENTRIES, isCritical);
    this.visibility = visibility;
  }

  /**
   * Writes this control's value to an ASN.1 writer. The value must be
   * written as an ASN1OctetString.
   *
   * @param writer The ASN.1 writer to use.
   * @throws IOException If a problem occurs while writing to the stream.
   */
  @Override
  protected void writeValue(ASN1Writer writer) throws IOException
  {
    writer.writeStartSequence(ASN1.UNIVERSAL_OCTET_STRING_TYPE);
    writer.writeBoolean(visibility);
    writer.writeEndSequence();
  }

  /**
   * Retrieves the visibility for this Subentries Control.
   *
   * @return  The visibility for this Subentries Control.
   */
  public boolean getVisibility()
  {
    return visibility;
  }

  /**
   * Appends a string representation of this Subentries Control to the
   * provided buffer.
   *
   * @param  buffer  The buffer to which the information should be appended.
   */
  @Override
  public void toString(StringBuilder buffer)
  {
    buffer.append("SubentriesControl(visibility=\"");
    buffer.append(visibility);
    buffer.append("\")");
  }
}