001package org.apache.commons.ssl.asn1;
002
003import java.io.IOException;
004
005/** DER BMPString object. */
006public class DERBMPString
007    extends ASN1Object
008    implements DERString {
009    String string;
010
011    /**
012     * return a BMP String from the given object.
013     *
014     * @param obj the object we want converted.
015     * @throws IllegalArgumentException if the object cannot be converted.
016     */
017    public static DERBMPString getInstance(
018        Object obj) {
019        if (obj == null || obj instanceof DERBMPString) {
020            return (DERBMPString) obj;
021        }
022
023        if (obj instanceof ASN1OctetString) {
024            return new DERBMPString(((ASN1OctetString) obj).getOctets());
025        }
026
027        if (obj instanceof ASN1TaggedObject) {
028            return getInstance(((ASN1TaggedObject) obj).getObject());
029        }
030
031        throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
032    }
033
034    /**
035     * return a BMP String from a tagged object.
036     *
037     * @param obj      the tagged object holding the object we want
038     * @param explicit true if the object is meant to be explicitly
039     *                 tagged false otherwise.
040     * @throws IllegalArgumentException if the tagged object cannot
041     *                                  be converted.
042     */
043    public static DERBMPString getInstance(
044        ASN1TaggedObject obj,
045        boolean explicit) {
046        return getInstance(obj.getObject());
047    }
048
049
050    /** basic constructor - byte encoded string. */
051    public DERBMPString(
052        byte[] string) {
053        char[] cs = new char[string.length / 2];
054
055        for (int i = 0; i != cs.length; i++) {
056            cs[i] = (char) ((string[2 * i] << 8) | (string[2 * i + 1] & 0xff));
057        }
058
059        this.string = new String(cs);
060    }
061
062    /** basic constructor */
063    public DERBMPString(
064        String string) {
065        this.string = string;
066    }
067
068    public String getString() {
069        return string;
070    }
071
072    public String toString() {
073        return string;
074    }
075
076    public int hashCode() {
077        return this.getString().hashCode();
078    }
079
080    protected boolean asn1Equals(
081        DERObject o) {
082        if (!(o instanceof DERBMPString)) {
083            return false;
084        }
085
086        DERBMPString s = (DERBMPString) o;
087
088        return this.getString().equals(s.getString());
089    }
090
091    void encode(
092        DEROutputStream out)
093        throws IOException {
094        char[] c = string.toCharArray();
095        byte[] b = new byte[c.length * 2];
096
097        for (int i = 0; i != c.length; i++) {
098            b[2 * i] = (byte) (c[i] >> 8);
099            b[2 * i + 1] = (byte) c[i];
100        }
101
102        out.writeEncoded(BMP_STRING, b);
103    }
104}