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package Torello.HTML.NodeSearch;

/**
 * Indicates that an HTML segment, or a single HTML-Tag, was not found at a particular location
 * on an HTML Page-<CODE>Vector</CODE> where that piece of HTML was expected.
 * 
 * <BR /><BR />One of the more difficult issues that can happen when writing HTML Methods that
 * parse and search for sections and elements that are not actually present on the page or sub-page
 * being searched.  If a section of HTML does not contain an element that a programmer expects it
 * to contain, any search method that returns a {@code DotPair} would return 'null'.
 * 
 * <BR /><BR />Rather than allowing a method to throw an unintended {@code NullPointerException}
 * just because the <B>'Find'</B> returned a null reference - <I>it is better to check the result
 * of a search, and if the section was not found to throw an {@code HTMLNotFoundException}.</I>
 */
public class HTMLNotFoundException extends RuntimeException
{
    /** <EMBED CLASS='external-html' DATA-FILE-ID=SVUIDEX>  */
    public static final long serialVersionUID = 1;

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

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

    /**
     * Constructs a new exception with the specified detail message and cause.
     * 
     * <BR /><BR /><DIV CLASS=JDHint>
     * <B STYLE='color:red;'>Note:</B> The detail message associated with cause is not
     * automatically incorporated into this exception's detail message.
     * </DIV>
     * 
     * @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 nonexistent or unknown.)
     */
    public HTMLNotFoundException(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 HTMLNotFoundException(Throwable cause)
    { super(cause); }
}