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DSS Model contains the data model representation for DSS

There is a newer version: 6.0.d4j.2

package port.org.bouncycastle.asn1;

import java.io.IOException;

import port.org.bouncycastle.util.Arrays;
import port.org.bouncycastle.util.Strings;

/**
 * DER UTF8String object.
 */
public class DERUTF8String extends ASN1Primitive implements ASN1String {

	private byte[] string;

	/**
	 * Return an UTF8 string from the passed in object.
	 *
	 * @param obj
	 *            a DERUTF8String or an object that can be converted into one.
	 * @exception IllegalArgumentException
	 *                if the object cannot be converted.
	 * @return a DERUTF8String instance, or null
	 */
	public static DERUTF8String getInstance(Object obj) {
		if ((obj == null) || (obj instanceof DERUTF8String)) {
			return (DERUTF8String) obj;
		}

		if (obj instanceof byte[]) {
			try {
				return (DERUTF8String) fromByteArray((byte[]) obj);
			} catch (Exception e) {
				throw new IllegalArgumentException("encoding error in getInstance: " + e.toString());
			}
		}

		throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
	}

	/**
	 * Return an UTF8 String from a tagged object.
	 *
	 * @param obj
	 *            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 tagged object cannot be converted.
	 * @return a DERUTF8String instance, or null
	 */
	public static DERUTF8String getInstance(ASN1TaggedObject obj, boolean explicit) {
		ASN1Primitive o = obj.getObject();

		if (explicit || (o instanceof DERUTF8String)) {
			return getInstance(o);
		} else {
			return new DERUTF8String(ASN1OctetString.getInstance(o).getOctets());
		}
	}

	/**
	 * Basic constructor - byte encoded string.
	 */
	DERUTF8String(byte[] string) {
		this.string = string;
	}

	/**
	 * Basic constructor
	 */
	public DERUTF8String(String string) {
		this.string = Strings.toUTF8ByteArray(string);
	}

	@Override
	public String getString() {
		return Strings.fromUTF8ByteArray(string);
	}

	@Override
	public String toString() {
		return getString();
	}

	@Override
	public int hashCode() {
		return Arrays.hashCode(string);
	}

	@Override
	boolean asn1Equals(ASN1Primitive o) {
		if (!(o instanceof DERUTF8String)) {
			return false;
		}

		DERUTF8String s = (DERUTF8String) o;

		return Arrays.areEqual(string, s.string);
	}

	@Override
	boolean isConstructed() {
		return false;
	}

	@Override
	int encodedLength() throws IOException {
		return 1 + StreamUtil.calculateBodyLength(string.length) + string.length;
	}

	@Override
	void encode(ASN1OutputStream out) throws IOException {
		out.writeEncoded(BERTags.UTF8_STRING, string);
	}

}