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package Torello.HTML;

/**
 * <CODE>ClosingTagNodeException - Documentation.</CODE><BR /><BR />
 * 
 * This method is used to indicate that a programmer is trying to write attributes to a
 * closing-version of a {@code TagNode}.  Valid HTML does not allow "Inner Tags" or "Attributes" 
 * to be inserted into HTML Elements that begin with the forward-slash (ASCII Character: {@code '/'}).
 * The {@code class TagNode} has quite a few methods that facilitate saving Inner-Tag
 * <B STYLE="color: red;">Key / Value Pairs</B> to the text-{@code String} of a {@code TagNode}.  In
 * cases where one, mistakenly, is attempting to perform such an insert on a closing version of the
 * element, then this exception must throw.
 */
public class ClosingTagNodeException extends RuntimeException
{
    /** <EMBED CLASS="external-html" DATA-FILE-ID="SVUIDEX"> */
    public static final long serialVersionUID = 1;

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

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

    /**
     * Constructs a new exception with the specified detail message and cause.
     * <BR /><BR /><B>NOTE:</B> The detail message associated with cause is not automatically
     * incorporated in 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 ClosingTagNodeException(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 non-existent or unknown.)
     */
    public ClosingTagNodeException(Throwable cause)
    { super(cause); }

    /**
     * Checks the input {@code TagNode} parameter to ensure that it is a 'Closing HTML Element.'  
     * This can be verified by inspecting the {@code public final boolean 'isClosing'} field.
     * If the {@code TagNode} input does not represent a 'Closing HTML Element', then this
     * exception shall throw.
     * @param tn Any HTML {@code TagNode} element
     * @throws ClosingTagNodeException This throws if {@code tn.isclosing} is <B>FALSE</B>.  Exits
     * gracefully otherwise.
     */
    public static void check(TagNode tn)
    {
        if (! tn.isClosing) return;

        throw new ClosingTagNodeException(
            "You have attempted to add, modify, delete, or update the inner-tag key-value pair information " +
            "for this particular HTML Element.  Unfortunately, the value of 'isClosing' for this TagNode is " +
            "TRUE, and therefore may not possess any attribute key-value pairs at all.  NOTE: The '.tok' " +
            "field for this TagNode is: [" + tn.tok + "], and the '.str' field is: [" + tn.str + "]"
        );
    }
}