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package org.bouncycastle.asn1.cms;

import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERSequence;

/**
 * RFC 5544
 * Binding Documents with Time-Stamps; TimeStampTokenEvidence object.
 *  * TimeStampTokenEvidence ::=
 *    SEQUENCE SIZE(1..MAX) OF TimeStampAndCRL
 * 
 */
public class TimeStampTokenEvidence
    extends ASN1Object
{
    private TimeStampAndCRL[] timeStampAndCRLs;

    public TimeStampTokenEvidence(TimeStampAndCRL[] timeStampAndCRLs)
    {
        this.timeStampAndCRLs = copy(timeStampAndCRLs);
    }

    public TimeStampTokenEvidence(TimeStampAndCRL timeStampAndCRL)
    {
        this.timeStampAndCRLs = new TimeStampAndCRL[1];

        timeStampAndCRLs[0] = timeStampAndCRL;
    }

    private TimeStampTokenEvidence(ASN1Sequence seq)
    {
        this.timeStampAndCRLs = new TimeStampAndCRL[seq.size()];

        int count = 0;

        for (Enumeration en = seq.getObjects(); en.hasMoreElements();)
        {
            timeStampAndCRLs[count++] = TimeStampAndCRL.getInstance(en.nextElement());
        }
    }

    public static TimeStampTokenEvidence getInstance(ASN1TaggedObject tagged, boolean explicit)
    {
        return getInstance(ASN1Sequence.getInstance(tagged, explicit));
    }

    /**
     * Return a TimeStampTokenEvidence object from the given object.
     * 
     * Accepted inputs:
     * 

     *  null → null
     * 
 {@link TimeStampTokenEvidence} object
     * 
 {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with TimeStampTokenEvidence structure inside
     * 
     *
     * @param obj the object we want converted.
     * @exception IllegalArgumentException if the object cannot be converted.
     */
    public static TimeStampTokenEvidence getInstance(Object obj)
    {
        if (obj instanceof TimeStampTokenEvidence)
        {
            return (TimeStampTokenEvidence)obj;
        }
        else if (obj != null)
        {
            return new TimeStampTokenEvidence(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    public TimeStampAndCRL[] toTimeStampAndCRLArray()
    {
        return copy(timeStampAndCRLs);
    }

    private TimeStampAndCRL[] copy(TimeStampAndCRL[] tsAndCrls)
    {
        TimeStampAndCRL[] tmp = new TimeStampAndCRL[tsAndCrls.length];

        System.arraycopy(tsAndCrls, 0, tmp, 0, tmp.length);

        return tmp;
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(timeStampAndCRLs.length);

        for (int i = 0; i != timeStampAndCRLs.length; i++)
        {
            v.add(timeStampAndCRLs[i]);
        }

        return new DERSequence(v);
    }

}