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package org.apache.commons.ssl.asn1;

import java.io.IOException;

public class DERBoolean
    extends ASN1Object {
    byte value;

    public static final DERBoolean FALSE = new DERBoolean(false);
    public static final DERBoolean TRUE = new DERBoolean(true);

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

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

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

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

    /** return a DERBoolean from the passed in boolean. */
    public static DERBoolean getInstance(
        boolean value) {
        return (value ? TRUE : FALSE);
    }

    /**
     * return a Boolean 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 DERBoolean getInstance(
        ASN1TaggedObject obj,
        boolean explicit) {
        return getInstance(obj.getObject());
    }

    public DERBoolean(
        byte[] value) {
        this.value = value[0];
    }

    public DERBoolean(
        boolean value) {
        this.value = (value) ? (byte) 0xff : (byte) 0;
    }

    public boolean isTrue() {
        return (value != 0);
    }

    void encode(
        DEROutputStream out)
        throws IOException {
        byte[] bytes = new byte[1];

        bytes[0] = value;

        out.writeEncoded(BOOLEAN, bytes);
    }

    protected boolean asn1Equals(
        DERObject o) {
        if ((o == null) || !(o instanceof DERBoolean)) {
            return false;
        }

        return (value == ((DERBoolean) o).value);
    }

    public int hashCode() {
        return value;
    }


    public String toString() {
        return (value != 0) ? "TRUE" : "FALSE";
    }
}