htmldtd.java

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        if ( openTag.equalsIgnoreCase( "LI" ) || openTag.equalsIgnoreCase( "OPTION" ) )
            return isElement( tagName, CLOSE_SELF );
        // Each of these table sections closes all the others
        if ( openTag.equalsIgnoreCase( "THEAD" ) || openTag.equalsIgnoreCase( "TFOOT" ) ||
             openTag.equalsIgnoreCase( "TBODY" ) || openTag.equalsIgnoreCase( "TR" ) ||
             openTag.equalsIgnoreCase( "COLGROUP" ) )
            return isElement( tagName, CLOSE_TABLE );
        // TD closes TH and TH closes TD
        if ( openTag.equalsIgnoreCase( "TH" ) || openTag.equalsIgnoreCase( "TD" ) )
            return isElement( tagName, CLOSE_TH_TD );
        return false;
    }


    /**
     * Returns true if the specified attribute it a URI and should be
     * escaped appropriately. In HTML URIs are escaped differently
     * than normal attributes.
     *
     * @param tagName The element's tag name
     * @param attrName The attribute's name
     */
    public static boolean isURI( String tagName, String attrName )
    {
        // Stupid checks.
        return ( attrName.equalsIgnoreCase( "href" ) || attrName.equalsIgnoreCase( "src" ) );
    }


    /**
     * Returns true if the specified attribute is a boolean and should be
     * printed without the value. This applies to attributes that are true
     * if they exist, such as selected (OPTION/INPUT).
     *
     * @param tagName The element's tag name
     * @param attrName The attribute's name
     */
    public static boolean isBoolean( String tagName, String attrName )
    {
        String[] attrNames;

        attrNames = (String[]) _boolAttrs.get( tagName.toUpperCase() );
        if ( attrNames == null )
            return false;
        for ( int i = 0 ; i < attrNames.length ; ++i )
            if ( attrNames[ i ].equalsIgnoreCase( attrName ) )
                return true;
        return false;
    }


    /**
     * Returns the value of an HTML character reference by its name. If the
     * reference is not found or was not defined as a character reference,
     * returns EOF (-1).
     *
     * @param name Name of character reference
     * @return Character code or EOF (-1)
     */
    public static int charFromName( String name )
    {
        Object    value;

        initialize();
        value = _byName.get( name );
        if ( value != null && value instanceof Integer )
            return ( (Integer) value ).intValue();
        else
            return -1;
    }


    /**
     * Returns the name of an HTML character reference based on its character
     * value. Only valid for entities defined from character references. If no
     * such character value was defined, return null.
     *
     * @param value Character value of entity
     * @return Entity's name or null
     */
    public static String fromChar(int value )
    {
       if (value > 0xffff)
            return null;

        String name;

        initialize();
        name = (String) _byChar.get( new Integer( value ) );
        return name;
    }


    /**
     * Initialize upon first access. Will load all the HTML character references
     * into a list that is accessible by name or character value and is optimized
     * for character substitution. This method may be called any number of times
     * but will execute only once.
     */
    private static void initialize()
    {
        InputStream     is = null;
        BufferedReader  reader = null;
        int             index;
        String          name;
        String          value;
        int             code;
        String          line;

        // Make sure not to initialize twice.
        if ( _byName != null )
            return;
        try {
            _byName = new HashMap();
            _byChar = new HashMap();
            is = HTMLdtd.class.getResourceAsStream( ENTITIES_RESOURCE );
            if ( is == null )
                throw new RuntimeException( "SER003 The resource [" + ENTITIES_RESOURCE + "] could not be found.\n" + ENTITIES_RESOURCE);
            reader = new BufferedReader( new InputStreamReader( is ) );
            line = reader.readLine();
            while ( line != null ) {
                if ( line.length() == 0 || line.charAt( 0 ) == '#' ) {
                    line = reader.readLine();
                    continue;
                }
                index = line.indexOf( ' ' );
                if ( index > 1 ) {
                    name = line.substring( 0, index );
                    ++index;
                    if ( index < line.length() ) {
                        value = line.substring( index );
                        index = value.indexOf( ' ' );
                        if ( index > 0 )
                            value = value.substring( 0, index );
                        code = Integer.parseInt( value );
                                        defineEntity( name, (char) code );
                    }
                }
                line = reader.readLine();
            }
            is.close();
        }  catch ( Exception except ) {
            throw new RuntimeException( "SER003 The resource [" + ENTITIES_RESOURCE + "] could not load: " +
                                        except.toString() + "\n" + ENTITIES_RESOURCE + "\t" + except.toString());
        } finally {
            if ( is != null ) {
                try {
                    is.close();
                } catch ( Exception except ) { }
            }
        }
        // save only the unmodifiable map to the member variable.
		_byName = Collections.unmodifiableMap(_byName);
		_byChar = Collections.unmodifiableMap(_byChar);
    }


    /**
     * Defines a new character reference. The reference's name and value are
     * supplied. Nothing happens if the character reference is already defined.
     * <P>
     * Unlike internal entities, character references are a string to single
     * character mapping. They are used to map non-ASCII characters both on
     * parsing and printing, primarily for HTML documents. '&lt;amp;' is an
     * example of a character reference.
     *
     * @param name The entity's name
     * @param value The entity's value
     */
    private static void defineEntity( String name, char value )
    {
        if ( _byName.get( name ) == null ) {
            _byName.put( name, new Integer( value ) );
            _byChar.put( new Integer( value ), name );
        }
    }


    private static void defineElement( String name, int flags )
    {
        _elemDefs.put( name, new Integer( flags ) );
    }


    private static void defineBoolean( String tagName, String attrName )
    {
        defineBoolean( tagName, new String[] { attrName } );
    }


    private static void defineBoolean( String tagName, String[] attrNames )
    {
        _boolAttrs.put( tagName, attrNames );
    }


    private static boolean isElement( String name, int flag )
    {
        Integer flags;

        flags = (Integer) _elemDefs.get( name.toUpperCase() );
        if ( flags == null )
            return false;
        else
            return ( ( flags.intValue() & flag ) == flag );
    }


    static
    {
        _elemDefs = new HashMap();
        defineElement( "ADDRESS", CLOSE_P );
        defineElement( "AREA", EMPTY );
        defineElement( "BASE",  EMPTY | ALLOWED_HEAD );
        defineElement( "BASEFONT", EMPTY );
        defineElement( "BLOCKQUOTE", CLOSE_P );
        defineElement( "BODY", OPT_CLOSING );
        defineElement( "BR", EMPTY );
        defineElement( "COL", EMPTY );
        defineElement( "COLGROUP", ELEM_CONTENT | OPT_CLOSING | CLOSE_TABLE );
        defineElement( "DD", OPT_CLOSING | ONLY_OPENING | CLOSE_DD_DT );
        defineElement( "DIV", CLOSE_P );
        defineElement( "DL", ELEM_CONTENT | CLOSE_P );
        defineElement( "DT", OPT_CLOSING | ONLY_OPENING | CLOSE_DD_DT );
        defineElement( "FIELDSET", CLOSE_P );
        defineElement( "FORM", CLOSE_P );
        defineElement( "FRAME", EMPTY | OPT_CLOSING );
        defineElement( "H1", CLOSE_P );
        defineElement( "H2", CLOSE_P );
        defineElement( "H3", CLOSE_P );
        defineElement( "H4", CLOSE_P );
        defineElement( "H5", CLOSE_P );
        defineElement( "H6", CLOSE_P );
        defineElement( "HEAD", ELEM_CONTENT | OPT_CLOSING );
        defineElement( "HR", EMPTY | CLOSE_P );
        defineElement( "HTML", ELEM_CONTENT | OPT_CLOSING );
        defineElement( "IMG", EMPTY );
        defineElement( "INPUT", EMPTY );
        defineElement( "ISINDEX", EMPTY | ALLOWED_HEAD );
        defineElement( "LI", OPT_CLOSING | ONLY_OPENING | CLOSE_SELF );
        defineElement( "LINK", EMPTY | ALLOWED_HEAD );
        defineElement( "MAP", ALLOWED_HEAD );
        defineElement( "META", EMPTY | ALLOWED_HEAD );
        defineElement( "OL", ELEM_CONTENT | CLOSE_P );
        defineElement( "OPTGROUP", ELEM_CONTENT );
        defineElement( "OPTION", OPT_CLOSING | ONLY_OPENING | CLOSE_SELF );
        defineElement( "P", OPT_CLOSING | CLOSE_P | CLOSE_SELF );
        defineElement( "PARAM", EMPTY );
        defineElement( "PRE", PRESERVE | CLOSE_P );
        defineElement( "SCRIPT", ALLOWED_HEAD | PRESERVE );
        defineElement( "NOSCRIPT", ALLOWED_HEAD | PRESERVE );
        defineElement( "SELECT", ELEM_CONTENT );
        defineElement( "STYLE", ALLOWED_HEAD | PRESERVE );
        defineElement( "TABLE", ELEM_CONTENT | CLOSE_P );
        defineElement( "TBODY", ELEM_CONTENT | OPT_CLOSING | CLOSE_TABLE );
        defineElement( "TD", OPT_CLOSING | CLOSE_TH_TD );
        defineElement( "TEXTAREA", PRESERVE );
        defineElement( "TFOOT", ELEM_CONTENT | OPT_CLOSING | CLOSE_TABLE );
        defineElement( "TH", OPT_CLOSING | CLOSE_TH_TD );
        defineElement( "THEAD", ELEM_CONTENT | OPT_CLOSING | CLOSE_TABLE );
        defineElement( "TITLE", ALLOWED_HEAD );
        defineElement( "TR", ELEM_CONTENT | OPT_CLOSING | CLOSE_TABLE );
        defineElement( "UL", ELEM_CONTENT | CLOSE_P );
		_elemDefs = Collections.unmodifiableMap(_elemDefs);;

		_boolAttrs = new HashMap();
        defineBoolean( "AREA", "href" );
        defineBoolean( "BUTTON", "disabled" );
        defineBoolean( "DIR", "compact" );
        defineBoolean( "DL", "compact" );
        defineBoolean( "FRAME", "noresize" );
        defineBoolean( "HR", "noshade" );
        defineBoolean( "IMAGE", "ismap" );
        defineBoolean( "INPUT", new String[] { "defaultchecked", "checked", "readonly", "disabled" } );
        defineBoolean( "LINK", "link" );
        defineBoolean( "MENU", "compact" );
        defineBoolean( "OBJECT", "declare" );
        defineBoolean( "OL", "compact" );
        defineBoolean( "OPTGROUP", "disabled" );
        defineBoolean( "OPTION", new String[] { "default-selected", "selected", "disabled" } );
        defineBoolean( "SCRIPT", "defer" );
        defineBoolean( "SELECT", new String[] { "multiple", "disabled" } );
        defineBoolean( "STYLE", "disabled" );
        defineBoolean( "TD", "nowrap" );
        defineBoolean( "TH", "nowrap" );
        defineBoolean( "TEXTAREA", new String[] { "disabled", "readonly" } );
        defineBoolean( "UL", "compact" );
		_boolAttrs = Collections.unmodifiableMap(_boolAttrs);

        initialize();
    }



}