package org.apache.commons.ssl.asn1;
import java.io.IOException;
/** DER NumericString object - this is an ascii string of characters {0,1,2,3,4,5,6,7,8,9, }. */
public class DERNumericString
extends ASN1Object
implements DERString {
String string;
/**
* return a Numeric string from the passed in object
*
* @throws IllegalArgumentException if the object cannot be converted.
*/
public static DERNumericString getInstance(
Object obj) {
if (obj == null || obj instanceof DERNumericString) {
return (DERNumericString) obj;
}
if (obj instanceof ASN1OctetString) {
return new DERNumericString(((ASN1OctetString) obj).getOctets());
}
if (obj instanceof ASN1TaggedObject) {
return getInstance(((ASN1TaggedObject) obj).getObject());
}
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.
* @throws IllegalArgumentException if the tagged object cannot
* be converted.
*/
public static DERNumericString getInstance(
ASN1TaggedObject obj,
boolean explicit) {
return getInstance(obj.getObject());
}
/** basic constructor - with bytes. */
public DERNumericString(
byte[] string) {
char[] cs = new char[string.length];
for (int i = 0; i != cs.length; i++) {
cs[i] = (char) (string[i] & 0xff);
}
this.string = new String(cs);
}
/** 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 = string;
}
public String getString() {
return string;
}
public String toString() {
return string;
}
public byte[] getOctets() {
char[] cs = string.toCharArray();
byte[] bs = new byte[cs.length];
for (int i = 0; i != cs.length; i++) {
bs[i] = (byte) cs[i];
}
return bs;
}
void encode(
DEROutputStream out)
throws IOException {
out.writeEncoded(NUMERIC_STRING, this.getOctets());
}
public int hashCode() {
return this.getString().hashCode();
}
boolean asn1Equals(
DERObject o) {
if (!(o instanceof DERNumericString)) {
return false;
}
DERNumericString s = (DERNumericString) o;
return this.getString().equals(s.getString());
}
/**
* 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;
}
}