/* Copyright (c) 2000 The Legion Of The Bouncy Castle
 * (http://www.bouncycastle.org)
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package jcifs.spnego.asn1;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

/**
 * DER TaggedObject - in ASN.1 nottation this is any object proceeded by
 * a [n] where n is some number - these are assume to follow the construction
 * rules (as with sequences).
 */
public class DERTaggedObject
    extends ASN1TaggedObject
{
    /**
     * @param tagNo the tag number for this object.
     * @param obj the tagged object.
     */
    public DERTaggedObject(
        int             tagNo,
        DEREncodable    obj)
    {
        super(tagNo, obj);
    }

    /**
     * @param explicit true if an explicitly tagged object.
     * @param tagNo the tag number for this object.
     * @param obj the tagged object.
     */
    public DERTaggedObject(
        boolean         explicit,
        int             tagNo,
        DEREncodable    obj)
    {
        super(explicit, tagNo, obj);
    }

    /**
     * create an implicitly tagged object that contains a zero
     * length sequence.
     */
    public DERTaggedObject(
        int             tagNo)
    {
        super(false, tagNo, new DERSequence());
    }

    void encode(
        DEROutputStream  out)
        throws IOException
    {
        if (!empty)
        {
            ByteArrayOutputStream   bOut = new ByteArrayOutputStream();
            DEROutputStream         dOut = new DEROutputStream(bOut);

            dOut.writeObject(obj);
            dOut.close();

            byte[]  bytes = bOut.toByteArray();

            if (explicit)
            {
                out.writeEncoded(CONSTRUCTED | TAGGED | tagNo, bytes);
            }
            else
            {
                //
                // need to mark constructed types...
                //
                if ((bytes[0] & CONSTRUCTED) != 0)
                {
                    bytes[0] = (byte)(CONSTRUCTED | TAGGED | tagNo);
                }
                else
                {
                    bytes[0] = (byte)(TAGGED | tagNo);
                }

                out.write(bytes);
            }
        }
        else
        {
            out.writeEncoded(CONSTRUCTED | TAGGED | tagNo, new byte[0]);
        }
    }
}