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DSS Model contains the data model representation for DSS
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package port.org.bouncycastle.asn1;

import java.io.IOException;

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

/**
 * DER NumericString object - this is an ascii string of characters {0,1,2,3,4,5,6,7,8,9, }.
 */
public class DERNumericString extends ASN1Primitive implements ASN1String {

	private byte[] string;

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

		if (obj instanceof byte[]) {
			try {
				return (DERNumericString) 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 Numeric 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 DERNumericString instance, or null.
	 */
	public static DERNumericString getInstance(ASN1TaggedObject obj, boolean explicit) {
		ASN1Primitive o = obj.getObject();

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

	/**
	 * basic constructor - with bytes.
	 */
	DERNumericString(byte[] string) {
		this.string = string;
	}

	/**
	 * basic constructor - without validation..
	 */
	public DERNumericString(String string) {
		this(string, false);
	}

	/**
	 * Constructor with optional validation.
	 *
	 * @param string
	 *            the base string to wrap.
	 * @param validate
	 *            whether or not to check the string.
	 * @throws IllegalArgumentException
	 *             if validate is true and the string
	 *             contains characters that should not be in a NumericString.
	 */
	public DERNumericString(String string, boolean validate) {
		if (validate && !isNumericString(string)) {
			throw new IllegalArgumentException("string contains illegal characters");
		}

		this.string = Strings.toByteArray(string);
	}

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

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

	public byte[] getOctets() {
		return Arrays.clone(string);
	}

	@Override
	boolean isConstructed() {
		return false;
	}

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

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

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

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

		DERNumericString s = (DERNumericString) o;

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

	/**
	 * Return true if the string can be represented as a NumericString ('0'..'9', ' ')
	 *
	 * @param str
	 *            string to validate.
	 * @return true if numeric, fale otherwise.
	 */
	public static boolean isNumericString(String str) {
		for (int i = str.length() - 1; i >= 0; i--) {
			char ch = str.charAt(i);

			if (ch > 0x007f) {
				return false;
			}

			if ((('0' <= ch) && (ch <= '9')) || (ch == ' ')) {
				continue;
			}

			return false;
		}

		return true;
	}

}