package org.bouncycastle.asn1;

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

Class representing the DER-type External
/**
 * Class representing the DER-type External
 */
public class DERExternal
    extends ASN1External
{
    
Construct a DER EXTERNAL object, the input encoding vector must have exactly two elements on it.

Acceptable input formats are:

 ASN1ObjectIdentifier + data DERTaggedObject (direct reference form)
 ASN1Integer + data DERTaggedObject (indirect reference form)
 Anything but DERTaggedObject + data DERTaggedObject (data value form)

Throws:
IllegalArgumentException – if input size is wrong, or/**
     * Construct a DER EXTERNAL object, the input encoding vector must have exactly two elements on it.
     * <p>
     * Acceptable input formats are:
     * <ul>
     * <li> {@link ASN1ObjectIdentifier} + data {@link DERTaggedObject} (direct reference form)</li>
     * <li> {@link ASN1Integer} + data {@link DERTaggedObject} (indirect reference form)</li>
     * <li> Anything but {@link DERTaggedObject} + data {@link DERTaggedObject} (data value form)</li>
     * </ul>
     *
     * @throws IllegalArgumentException if input size is wrong, or
     */
    public DERExternal(ASN1EncodableVector vector)
    {
        super(vector);
    }

    
Creates a new instance of DERExternal
See X.690 for more informations about the meaning of these parameters
Params:
directReference – The direct reference or null if not set.
indirectReference – The indirect reference or null if not set.
dataValueDescriptor – The data value descriptor or null if not set.
externalData – The external data in its encoded form./**
     * Creates a new instance of DERExternal
     * See X.690 for more informations about the meaning of these parameters
     * @param directReference The direct reference or <code>null</code> if not set.
     * @param indirectReference The indirect reference or <code>null</code> if not set.
     * @param dataValueDescriptor The data value descriptor or <code>null</code> if not set.
     * @param externalData The external data in its encoded form.
     */
    public DERExternal(ASN1ObjectIdentifier directReference, ASN1Integer indirectReference, ASN1Primitive dataValueDescriptor, DERTaggedObject externalData)
    {
        this(directReference, indirectReference, dataValueDescriptor, externalData.getTagNo(), externalData.toASN1Primitive());
    }

    
Creates a new instance of DERExternal.
See X.690 for more informations about the meaning of these parameters
Params:
directReference – The direct reference or null if not set.
indirectReference – The indirect reference or null if not set.
dataValueDescriptor – The data value descriptor or null if not set.
encoding – The encoding to be used for the external data
externalData – The external data/**
     * Creates a new instance of DERExternal.
     * See X.690 for more informations about the meaning of these parameters
     * @param directReference The direct reference or <code>null</code> if not set.
     * @param indirectReference The indirect reference or <code>null</code> if not set.
     * @param dataValueDescriptor The data value descriptor or <code>null</code> if not set.
     * @param encoding The encoding to be used for the external data
     * @param externalData The external data
     */
    public DERExternal(ASN1ObjectIdentifier directReference, ASN1Integer indirectReference, ASN1Primitive dataValueDescriptor, int encoding, ASN1Primitive externalData)
    {
        super(directReference, indirectReference, dataValueDescriptor, encoding, externalData);
    }

    int encodedLength()
        throws IOException
    {
        return this.getEncoded().length;
    }

    /* (non-Javadoc)
     * @see org.bouncycastle.asn1.ASN1Primitive#encode(org.bouncycastle.asn1.DEROutputStream)
     */
    void encode(ASN1OutputStream out)
        throws IOException
    {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        if (directReference != null)
        {
            baos.write(directReference.getEncoded(ASN1Encoding.DER));
        }
        if (indirectReference != null)
        {
            baos.write(indirectReference.getEncoded(ASN1Encoding.DER));
        }
        if (dataValueDescriptor != null)
        {
            baos.write(dataValueDescriptor.getEncoded(ASN1Encoding.DER));
        }
        DERTaggedObject obj = new DERTaggedObject(true, encoding, externalContent);
        baos.write(obj.getEncoded(ASN1Encoding.DER));
        out.writeEncoded(BERTags.CONSTRUCTED, BERTags.EXTERNAL, baos.toByteArray());
    }
}