DERUTF8String.java

package org.apache.commons.ssl.asn1;

import java.io.IOException;

/** DER UTF8String object. */
public class DERUTF8String
    extends ASN1Object
    implements DERString {
    String string;

    /**
     * return an UTF8 string from the passed in object.
     *
     * @throws IllegalArgumentException if the object cannot be converted.
     */
    public static DERUTF8String getInstance(Object obj) {
        if (obj == null || obj instanceof DERUTF8String) {
            return (DERUTF8String) obj;
        }

        if (obj instanceof ASN1OctetString) {
            return new DERUTF8String(((ASN1OctetString) obj).getOctets());
        }

        if (obj instanceof ASN1TaggedObject) {
            return getInstance(((ASN1TaggedObject) obj).getObject());
        }

        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.
     * @throws IllegalArgumentException if the tagged object cannot be converted.
     */
    public static DERUTF8String getInstance(
        ASN1TaggedObject obj,
        boolean explicit) {
        return getInstance(obj.getObject());
    }

    /** basic constructor - byte encoded string. */
    DERUTF8String(byte[] string) {
        this.string = Strings.fromUTF8ByteArray(string);
    }

    /** basic constructor */
    public DERUTF8String(String string) {
        this.string = string;
    }

    public String getString() {
        return string;
    }

    public String toString() {
        return string;
    }

    public int hashCode() {
        return this.getString().hashCode();
    }

    boolean asn1Equals(DERObject o) {
        if (!(o instanceof DERUTF8String)) {
            return false;
        }

        DERUTF8String s = (DERUTF8String) o;

        return this.getString().equals(s.getString());
    }

    void encode(DEROutputStream out)
        throws IOException {
        out.writeEncoded(UTF8_STRING, Strings.toUTF8ByteArray(string));
    }
}