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package org.bouncycastle.asn1;

import java.io.IOException;
import java.util.Enumeration;

/**
 * The DLSequence encodes a SEQUENCE using definite length form.
 */
public class DLSequence
    extends ASN1Sequence
{
    private int bodyLength = -1;

    /**
     * Create an empty sequence
     */
    public DLSequence()
    {
    }

    /**
     * create a sequence containing one object
     * @param obj the object to go in the sequence.
     */
    public DLSequence(
        ASN1Encodable obj)
    {
        super(obj);
    }

    /**
     * create a sequence containing a vector of objects.
     * @param v the vector of objects to make up the sequence.
     */
    public DLSequence(
        ASN1EncodableVector v)
    {
        super(v);
    }

    /**
     * create a sequence containing an array of objects.
     * @param array the array of objects to make up the sequence.
     */
    public DLSequence(
        ASN1Encodable[] array)
    {
        super(array);
    }

    private int getBodyLength()
        throws IOException
    {
        if (bodyLength < 0)
        {
            int length = 0;

            for (Enumeration e = this.getObjects(); e.hasMoreElements();)
            {
                Object obj = e.nextElement();

                length += ((ASN1Encodable)obj).toASN1Primitive().toDLObject().encodedLength();
            }

            bodyLength = length;
        }

        return bodyLength;
    }

    int encodedLength()
        throws IOException
    {
        int length = getBodyLength();

        return 1 + StreamUtil.calculateBodyLength(length) + length;
    }

    /**
     * A note on the implementation:
     * 

* As DL requires the constructed, definite-length model to * be used for structured types, this varies slightly from the * ASN.1 descriptions given. Rather than just outputting SEQUENCE, * we also have to specify CONSTRUCTED, and the objects length. */ void encode( ASN1OutputStream out) throws IOException { ASN1OutputStream dOut = out.getDLSubStream(); int length = getBodyLength(); out.write(BERTags.SEQUENCE | BERTags.CONSTRUCTED); out.writeLength(length); for (Enumeration e = this.getObjects(); e.hasMoreElements();) { Object obj = e.nextElement(); dOut.writeObject((ASN1Encodable)obj); } } }





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