package org.bouncycastle.asn1.cms;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.BERSequence;
import org.bouncycastle.asn1.DEREncodable;
import org.bouncycastle.asn1.DERInteger;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/** 
 * RFC 3274 - CMS Compressed Data.
 * <pre>
 * CompressedData ::= SEQUENCE {
 *  version CMSVersion,
 *  compressionAlgorithm CompressionAlgorithmIdentifier,
 *  encapContentInfo EncapsulatedContentInfo
 * }
 * </pre>
 */
public class CompressedData
    implements DEREncodable
{
	private DERInteger                 		version;
	private AlgorithmIdentifier 	        compressionAlgorithm;
	private ContentInfo    		            encapContentInfo;

	public CompressedData(
        AlgorithmIdentifier compressionAlgorithm,
        ContentInfo         encapContentInfo)
    {
        this.version = new DERInteger(0);
        this.compressionAlgorithm = compressionAlgorithm;
        this.encapContentInfo = encapContentInfo;
	}
	
	public CompressedData(
        ASN1Sequence seq)
    {
        this.version = (DERInteger)seq.getObjectAt(0);
		this.compressionAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(1));
		this.encapContentInfo = ContentInfo.getInstance(seq.getObjectAt(2));

	}

    /**
     * return a CompressedData object from a tagged object.
     *
     * @param _ato the tagged object holding the object we want.
     * @param _explicit true if the object is meant to be explicitly
     *              tagged false otherwise.
     * @exception IllegalArgumentException if the object held by the
     *          tagged object cannot be converted.
     */
	public static CompressedData getInstance(
        ASN1TaggedObject _ato,
        boolean _explicit)
    {
		return getInstance(ASN1Sequence.getInstance(_ato, _explicit));
	}
	
    /**
     * return a CompressedData object from the given object.
     *
     * @param _obj the object we want converted.
     * @exception IllegalArgumentException if the object cannot be converted.
     */
	public static CompressedData getInstance(
        Object _obj)
    {
		if (_obj == null || _obj instanceof CompressedData)
        {
			return (CompressedData)_obj;
		}
		
		if (_obj instanceof ASN1Sequence)
        {
			return new CompressedData((ASN1Sequence)_obj);
		}
		
		throw new IllegalArgumentException("Invalid CompressedData: " + _obj.getClass().getName());
	}

	public DERInteger getVersion()
    {
		return version;
	}

	public AlgorithmIdentifier getCompressionAlgorithmIdentifier()
    {
		return compressionAlgorithm;
	}

	public ContentInfo getEncapContentInfo()
    {
		return encapContentInfo;
	}

	public DERObject getDERObject()
    {
        ASN1EncodableVector v = new ASN1EncodableVector();

		v.add(version);
		v.add(compressionAlgorithm);
		v.add(encapContentInfo);

		return new BERSequence(v);
	}
}
