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package org.apache.commons.ssl.asn1;

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

/** A DER encoded set object */
public class DERSet
    extends ASN1Set {
    /** create an empty set */
    public DERSet() {
    }

    /** @param obj - a single object that makes up the set. */
    public DERSet(
        DEREncodable obj) {
        this.addObject(obj);
    }

    /** @param v - a vector of objects making up the set. */
    public DERSet(
        DEREncodableVector v) {
        this(v, true);
    }

    /** create a set from an array of objects. */
    public DERSet(
        ASN1Encodable[] a) {
        for (int i = 0; i != a.length; i++) {
            this.addObject(a[i]);
        }

        this.sort();
    }

    /** @param v - a vector of objects making up the set. */
    DERSet(
        DEREncodableVector v,
        boolean needsSorting) {
        for (int i = 0; i != v.size(); i++) {
            this.addObject(v.get(i));
        }

        if (needsSorting) {
            this.sort();
        }
    }

    /*
     * A note on the implementation:
     * 
     * As DER requires the constructed, definite-length model to
     * be used for structured types, this varies slightly from the
     * ASN.1 descriptions given. Rather than just outputing SET,
     * we also have to specify CONSTRUCTED, and the objects length.
     */
    void encode(
        DEROutputStream out)
        throws IOException {
        ByteArrayOutputStream bOut = new ByteArrayOutputStream();
        DEROutputStream dOut = new DEROutputStream(bOut);
        Enumeration e = this.getObjects();

        while (e.hasMoreElements()) {
            Object obj = e.nextElement();

            dOut.writeObject(obj);
        }

        dOut.close();

        byte[] bytes = bOut.toByteArray();

        out.writeEncoded(SET | CONSTRUCTED, bytes);
    }
}