htmldocumentimpl.java

用Java写的面相对象的数据库管理系统

        return null;
    } 
    
    
    public String getDomain() {
        // Information not available on server side.
        return null;
    } 
    
    
    public String getURL() {
        // Information not available on server side.
        return null;
    } 
    
    
    public String getCookie() {
        // Information not available on server side.
        return null;
    } 
    
    
    public void setCookie( String cookie ) {
    // Information not available on server side.
    } 
    
    
    public HTMLCollection getImages() {
        // For more information see HTMLCollection#collectionMatch
        if (_images == null) {
            _images = new HTMLCollectionImpl( getBody(), HTMLCollectionImpl.IMAGE );
        } 
        return _images;
    } 
    
    
    public HTMLCollection getApplets() {
        // For more information see HTMLCollection#collectionMatch
        if (_applets == null) {
            _applets = new HTMLCollectionImpl( getBody(), HTMLCollectionImpl.APPLET );
        } 
        return _applets;
    } 
    
    
    public HTMLCollection getLinks() {
        // For more information see HTMLCollection#collectionMatch
        if (_links == null) {
            _links = new HTMLCollectionImpl( getBody(), HTMLCollectionImpl.LINK );
        } 
        return _links;
    } 
    
    
    public HTMLCollection getForms() {
        // For more information see HTMLCollection#collectionMatch
        if (_forms == null) {
            _forms = new HTMLCollectionImpl( getBody(), HTMLCollectionImpl.FORM );
        } 
        return _forms;
    } 
    
    
    public HTMLCollection getAnchors() {
        // For more information see HTMLCollection#collectionMatch
        if (_anchors == null) {
            _anchors = new HTMLCollectionImpl( getBody(), HTMLCollectionImpl.ANCHOR );
        } 
        return _anchors;
    } 
    
    
    public void open() {
        // When called an in-memory is prepared. The document tree is still
        // accessible the old way, until this writer is closed.
        if (_writer == null) {
            _writer = new StringWriter();
        } 
    } 
    
    
    public void close() {
        // ! NOT IMPLEMENTED, REQUIRES PARSER !
        if (_writer != null) {
            _writer = null;
        } 
    } 
    
    
    public void write( String text ) {
        // Write a string into the in-memory writer.
        if (_writer != null) {
            _writer.write( text );
        } 
    } 
    
    
    public void writeln( String text ) {
        // Write a line into the in-memory writer.
        if (_writer != null) {
            _writer.write( text + "\n" );
        } 
    } 
    
    
    public Object clone() {
        HTMLDocumentImpl clone;
        
        clone = new HTMLDocumentImpl();
        cloneInto( clone, true );
        return clone;
    } 
    
    
    public Node cloneNode( boolean deep ) {
        HTMLDocumentImpl clone;
        
        clone = new HTMLDocumentImpl();
        cloneInto( clone, deep );
        return clone;
    } 
    
    
    protected Node castNewChild( Node newChild ) throws DOMException {
        // Same method appears in HTMLElementImpl and HTMLDocumentImpl.
        
        if (newChild == null) {
            throw new DOMExceptionImpl( DOMException.HIERARCHY_REQUEST_ERR, "Child reference is null." );
        } 
        if (!(newChild instanceof NodeImpl)) {
            throw new DOMExceptionImpl( DOMException.HIERARCHY_REQUEST_ERR,
                    "Child is not a compatible type for this node." );
        } 
        
        // newChild must be HTMLElement, Text, Comment, DocumentFragment or
        // ProcessingInstruction. CDATASection and EntityReference not supported
        // in HTML documents.
        if (!(newChild instanceof HTMLElementImpl || newChild instanceof Comment || newChild instanceof Text 
                || newChild instanceof DocumentFragment || newChild instanceof ProcessingInstruction)) {
            throw new DOMExceptionImpl( DOMException.HIERARCHY_REQUEST_ERR,
                    "Child is not a compatible type for this node." );
        } 
        return (NodeImpl)newChild;
    } 
    
    
    /**
     * Recursive method retreives an element by its <code>id</code> attribute.
     * Called by {@link #getElementById(String)}.
     *
     * @param elementId The <code>id</code> value to look for
     * @return The node in which to look for
     */
    private Element getElementById( String elementId, Node node ) {
        Node child;
        Element result;
        
        child = node.getFirstChild();
        while (child != null) {
            if (child instanceof Element) {
                if (elementId.equals( ((Element)child).getAttribute( "id" ) )) {
                    return (Element)child;
                } 
                result = getElementById( elementId, child );
                if (result != null) {
                    return result;
                } 
            } 
            child = child.getNextSibling();
        } 
        return null;
    } 
    
    
    /**
     * Called by the constructor to populate the element types list (see {@link
     * #_elementTypesHTML}). Will be called multiple times but populate the list
     * only the first time. Replacement for static constructor due to unknown
     * problem with the static constructor.
     */
    private static void populateElementTypes() {
        if (_elementTypesHTML != null) {
            return;
        } 
        _elementTypesHTML = new Hashtable( 63 );
        _elementTypesHTML.put( "A", HTMLAnchorElementImpl.class );
        _elementTypesHTML.put( "APPLET", HTMLAppletElementImpl.class );
        _elementTypesHTML.put( "AREA", HTMLAreaElementImpl.class );
        _elementTypesHTML.put( "BASE", HTMLBaseElementImpl.class );
        _elementTypesHTML.put( "BASEFONT", HTMLBaseFontElementImpl.class );
        _elementTypesHTML.put( "BLOCKQUOTE", HTMLBlockquoteElementImpl.class );
        _elementTypesHTML.put( "BODY", HTMLBodyElementImpl.class );
        _elementTypesHTML.put( "BR", HTMLBRElementImpl.class );
        _elementTypesHTML.put( "BUTTON", HTMLButtonElementImpl.class );
        _elementTypesHTML.put( "DEL", HTMLModElementImpl.class );
        _elementTypesHTML.put( "DIR", HTMLDirectoryElementImpl.class );
        _elementTypesHTML.put( "DIV", HTMLDivElementImpl.class );
        _elementTypesHTML.put( "DL", HTMLDListElementImpl.class );
        _elementTypesHTML.put( "FIELDSET", HTMLFieldSetElementImpl.class );
        _elementTypesHTML.put( "FONT", HTMLFontElementImpl.class );
        _elementTypesHTML.put( "FORM", HTMLFormElementImpl.class );
        _elementTypesHTML.put( "FRAME", HTMLFrameElementImpl.class );
        _elementTypesHTML.put( "FRAMESET", HTMLFrameSetElementImpl.class );
        _elementTypesHTML.put( "HEAD", HTMLHeadElementImpl.class );
        _elementTypesHTML.put( "H1", HTMLHeadingElementImpl.class );
        _elementTypesHTML.put( "H2", HTMLHeadingElementImpl.class );
        _elementTypesHTML.put( "H3", HTMLHeadingElementImpl.class );
        _elementTypesHTML.put( "H4", HTMLHeadingElementImpl.class );
        _elementTypesHTML.put( "H5", HTMLHeadingElementImpl.class );
        _elementTypesHTML.put( "H6", HTMLHeadingElementImpl.class );
        _elementTypesHTML.put( "HR", HTMLHRElementImpl.class );
        _elementTypesHTML.put( "HTML", HTMLHtmlElementImpl.class );
        _elementTypesHTML.put( "IFRAME", HTMLIFrameElementImpl.class );
        _elementTypesHTML.put( "IMG", HTMLImageElementImpl.class );
        _elementTypesHTML.put( "INPUT", HTMLInputElementImpl.class );
        _elementTypesHTML.put( "INS", HTMLModElementImpl.class );
        _elementTypesHTML.put( "ISINDEX", HTMLIsIndexElementImpl.class );
        _elementTypesHTML.put( "LABEL", HTMLLabelElementImpl.class );
        _elementTypesHTML.put( "LEGEND", HTMLLegendElementImpl.class );
        _elementTypesHTML.put( "LI", HTMLLIElementImpl.class );
        _elementTypesHTML.put( "LINK", HTMLLinkElementImpl.class );
        _elementTypesHTML.put( "MAP", HTMLMapElementImpl.class );
        _elementTypesHTML.put( "MENU", HTMLMenuElementImpl.class );
        _elementTypesHTML.put( "META", HTMLMetaElementImpl.class );
        _elementTypesHTML.put( "OBJECT", HTMLObjectElementImpl.class );
        _elementTypesHTML.put( "OL", HTMLOListElementImpl.class );
        _elementTypesHTML.put( "OPTGROUP", HTMLOptGroupElementImpl.class );
        _elementTypesHTML.put( "OPTION", HTMLOptionElementImpl.class );
        _elementTypesHTML.put( "P", HTMLParagraphElementImpl.class );
        _elementTypesHTML.put( "PARAM", HTMLParamElementImpl.class );
        _elementTypesHTML.put( "PRE", HTMLPreElementImpl.class );
        _elementTypesHTML.put( "Q", HTMLQuoteElementImpl.class );
        _elementTypesHTML.put( "SCRIPT", HTMLScriptElementImpl.class );
        _elementTypesHTML.put( "SELECT", HTMLSelectElementImpl.class );
        _elementTypesHTML.put( "STYLE", HTMLStyleElementImpl.class );
        _elementTypesHTML.put( "TABLE", HTMLTableElementImpl.class );
        _elementTypesHTML.put( "CAPTION", HTMLTableCaptionElementImpl.class );
        _elementTypesHTML.put( "TD", HTMLTableCellElementImpl.class );
        _elementTypesHTML.put( "COL", HTMLTableColElementImpl.class );
        _elementTypesHTML.put( "COLGROUP", HTMLTableColElementImpl.class );
        _elementTypesHTML.put( "TR", HTMLTableRowElementImpl.class );
        _elementTypesHTML.put( "TBODY", HTMLTableSectionElementImpl.class );
        _elementTypesHTML.put( "THEAD", HTMLTableSectionElementImpl.class );
        _elementTypesHTML.put( "TFOOT", HTMLTableSectionElementImpl.class );
        _elementTypesHTML.put( "TEXTAREA", HTMLTextAreaElementImpl.class );
        _elementTypesHTML.put( "TITLE", HTMLTitleElementImpl.class );
        _elementTypesHTML.put( "UL", HTMLUListElementImpl.class );
    } 
    
    
    /**
     */
    public HTMLDocumentImpl() {
        super();
        populateElementTypes();
    }
    
    
    /**
     * Holds {@link HTMLCollectionImpl} object with live collection of all
     * anchors in document. This reference is on demand only once.
     */
    private HTMLCollectionImpl _anchors;
    
    
    /**
     * Holds {@link HTMLCollectionImpl} object with live collection of all
     * forms in document. This reference is on demand only once.
     */
    private HTMLCollectionImpl _forms;
    
    
    /**
     * Holds {@link HTMLCollectionImpl} object with live collection of all
     * images in document. This reference is on demand only once.
     */
    private HTMLCollectionImpl _images;
    
    
    /**
     * Holds {@link HTMLCollectionImpl} object with live collection of all
     * links in document. This reference is on demand only once.
     */
    private HTMLCollectionImpl _links;
    
    
    /**
     * Holds {@link HTMLCollectionImpl} object with live collection of all
     * applets in document. This reference is on demand only once.
     */
    private HTMLCollectionImpl _applets;
    
    
    /**
     * Holds string writer used by direct manipulation operation ({@link #open}.
     * {@link #write}, etc) to write new contents into the document and parse
     * that text into a document tree.
     */
    private StringWriter _writer;
    
    
    /**
     * Holds names and classes of HTML element types. When an element with a
     * particular tag name is created, the matching {@link java.lang.Class}
     * is used to create the element object. For example, &lt;A&gt; matches
     * {@link HTMLAnchorElementImpl}. This static table is shared across all
     * HTML documents, as opposed to the non-static table defined in {@link
     * org.openxml.dom.DocumentImpl}.
     *
     * @see #createElement
     */
    private static Hashtable _elementTypesHTML;
    
    
    /**
     * Signature used to locate constructor of HTML element classes. This
     * static array is shared across all HTML documents.
     *
     * @see #createElement
     */
    private final static Class[] _elemClassSigHTML = new Class[] {HTMLDocumentImpl.class, String.class};
    
    
}