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package Torello.HTML;

/**
 * Used when an invalid, non-HTML, tag or token has been passed to a method.
 * 
 * <BR /><BR />For instance, if a programmer accidentally passes the characters {@code 'DVI'},
 * instead of {@code 'DIV'}, to a method that accepts HTML tokens / tags, then this exception
 * would throw.
 */
public class HTMLTokException extends IllegalArgumentException
{
    /** <EMBED CLASS='external-html' DATA-FILE-ID=SVUIDEX> */
    public static final long serialVersionUID = 1;

    /** Constructs an {@code HTMLTokException} with no detail message. */
    public HTMLTokException()
    { super(); }

    /**
     * Constructs an {@code HTMLTokException} with the specified detail message.
     * @param message the detail message.
     */
    public HTMLTokException(String message)
    { super(message); }

    /**
     * Constructs a new exception with the specified detail message and cause.
     *
     * <BR /><BR /><B CLASS=JDDescLabel>NOTE:</B>
     * 
     * <BR /><BR />The detail message associated with cause is not automatically incorporated into
     * this exception's detail message.
     * 
     * @param message The detail message (which is saved for later retrieval by the
     * {@code Throwable.getMessage()} method).
     *
     * @param cause the cause (which is saved for later retrieval by the 
     * {@code Throwable.getCause()} method). (A null value is permitted, and indicates that the
     * cause is non-existent or unknown.)
     */
    public HTMLTokException(String message, Throwable cause)
    { super(message, cause); }

    /**
     * Constructs a new exception with the specified cause and a detail message of
     * {@code (cause==null ? null : cause.toString())} (which typically contains the class and
     * detail message of cause).  This constructor is useful for exceptions that are little more
     * than wrappers for other throwables.
     *
     * @param cause The cause (which is saved for later retrieval by the
     * {@code Throwable.getCause()} method).  (A null value is permitted, and indicates that the
     * cause is nonexistent or unknown.)
     */
    public HTMLTokException(Throwable cause)
    { super(cause); }
  
    /**
     * This just checks if the passed HTML tok(s) is a valid HTML-element, for instance:
     * {@code img, div, p, a, b, h1, h2, h3} etc...
     *
     * <BR /><BR />It throws an HTMLTokException if an "invalid-{@code String}" is passed.
     *
     * @param htmlTags This may be any Java String (or strings), but only Java-String's that are
     * found to be valid HTML 4 or 5 tags will be accepted.
     * 
     * <BR /><BR /><B>NOTE:</B> Obviously, the '...' notation means multiple tags may be tested.
     * If one is found invalid, an exception is immediately thrown.
     * 
     * @throws HTMLTokException if the value passed in the tok parameter is not found in the
     * {@code HTMLTags.isTag(tok);} hashtable.
     */
    public static void check(String... htmlTags)
    {
        if (htmlTags.length == 0)
            throw new HTMLTokException
                ("You have passed zero arguments to the variable-length parameter 'htmlTags'");

        else if (htmlTags.length == 1)
        {
            if (htmlTags[0] == null)
                throw new NullPointerException(
                    "You have passed null for the value of HTML Tag/Token here, " +
                    "but this is not allowed."
                );

            if (! HTMLTags.isTag(htmlTags[0])) throw new HTMLTokException
                ("The HTML-Element provided isn't valid!  tok = [" + htmlTags[0] + "]");
        }

        else
        {
            String tok;
            for (int i=0; i < htmlTags.length; i++)

                if ((tok = htmlTags[i]) == null)
                    throw new NullPointerException(
                        "You have passed multiple HTML Tokens, but one of them was null " +
                        "(param #" + i + ").  This is not allowed"
                     );

                else if (! HTMLTags.isTag(tok))
                    throw new HTMLTokException(
                        "You have passed multiple HTML Tokens, but one of them isn't valid! " +
                        "(param #" + i + "),  tok = [" + tok + "]"
                    );
        }
    }
}