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package org.bouncycastle.asn1.x509.sigi;

import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1Choice;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1String;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x500.DirectoryString;

/**
 * Structure for a name or pseudonym.
 * 
 *  *       NameOrPseudonym ::= CHOICE {
 *            surAndGivenName SEQUENCE {
 *              surName DirectoryString,
 *              givenName SEQUENCE OF DirectoryString 
 *         },
 *            pseudonym DirectoryString 
 *       }
 * 
 * 
 * @see org.bouncycastle.asn1.x509.sigi.PersonalData
 * 
 */
public class NameOrPseudonym
    extends ASN1Object
    implements ASN1Choice
{
    private DirectoryString pseudonym;

    private DirectoryString surname;

    private ASN1Sequence givenName;

    public static NameOrPseudonym getInstance(Object obj)
    {
        if (obj == null || obj instanceof NameOrPseudonym)
        {
            return (NameOrPseudonym)obj;
        }

        if (obj instanceof ASN1String)
        {
            return new NameOrPseudonym(DirectoryString.getInstance(obj));
        }

        if (obj instanceof ASN1Sequence)
        {
            return new NameOrPseudonym((ASN1Sequence)obj);
        }

        throw new IllegalArgumentException("illegal object in getInstance: "
            + obj.getClass().getName());
    }

    /**
     * Constructor from DirectoryString.
     * 
     * The sequence is of type NameOrPseudonym:
     * 
     *       NameOrPseudonym ::= CHOICE {
     *            surAndGivenName SEQUENCE {
     *              surName DirectoryString,
     *              givenName SEQUENCE OF DirectoryString
     *         },
     *            pseudonym DirectoryString
     *       }
     * 
     * @param pseudonym pseudonym value to use.
     */
    public NameOrPseudonym(DirectoryString pseudonym)
    {
        this.pseudonym = pseudonym;
    }

    /**
     * Constructor from ASN1Sequence.
     * 
     * The sequence is of type NameOrPseudonym:
     * 
     *       NameOrPseudonym ::= CHOICE {
     *            surAndGivenName SEQUENCE {
     *              surName DirectoryString,
     *              givenName SEQUENCE OF DirectoryString
     *         },
     *            pseudonym DirectoryString
     *       }
     * 
     * 
     * @param seq The ASN.1 sequence.
     */
    private NameOrPseudonym(ASN1Sequence seq)
    {
        if (seq.size() != 2)
        {
            throw new IllegalArgumentException("Bad sequence size: "
                + seq.size());
        }

        if (!(seq.getObjectAt(0) instanceof ASN1String))
        {
            throw new IllegalArgumentException("Bad object encountered: "
                + seq.getObjectAt(0).getClass());
        }

        surname = DirectoryString.getInstance(seq.getObjectAt(0));
        givenName = ASN1Sequence.getInstance(seq.getObjectAt(1));
    }

    /**
     * Constructor from a given details.
     *
     * @param pseudonym The pseudonym.
     */
    public NameOrPseudonym(String pseudonym)
    {
        this(new DirectoryString(pseudonym));
    }

    /**
     * Constructor from a given details.
     *
     * @param surname   The surname.
     * @param givenName A sequence of directory strings making up the givenName
     */
    public NameOrPseudonym(DirectoryString surname, ASN1Sequence givenName)
    {
        this.surname = surname;
        this.givenName = givenName;
    }

    public DirectoryString getPseudonym()
    {
        return pseudonym;
    }

    public DirectoryString getSurname()
    {
        return surname;
    }

    public DirectoryString[] getGivenName()
    {
        DirectoryString[] items = new DirectoryString[givenName.size()];
        int count = 0;
        for (Enumeration e = givenName.getObjects(); e.hasMoreElements();)
        {
            items[count++] = DirectoryString.getInstance(e.nextElement());
        }
        return items;
    }

    /**
     * Produce an object suitable for an ASN1OutputStream.
     * 
     * Returns:
     * 
     *       NameOrPseudonym ::= CHOICE {
     *            surAndGivenName SEQUENCE {
     *              surName DirectoryString,
     *              givenName SEQUENCE OF DirectoryString
     *         },
     *            pseudonym DirectoryString
     *       }
     * 
     *
     * @return a DERObject
     */
    public ASN1Primitive toASN1Primitive()
    {
        if (pseudonym != null)
        {
            return pseudonym.toASN1Primitive();
        }
        else
        {
            ASN1EncodableVector vec1 = new ASN1EncodableVector(2);
            vec1.add(surname);
            vec1.add(givenName);
            return new DERSequence(vec1);
        }
    }
}