webgraph.java

一个用java语言编写的网络爬虫程序

    Image errorIcon;

    /**
     * Get a named icon.
     * @param name Name of icon.
     * @return icon associated with the name, or null if name unknown.
     */
    public synchronized Image getIcon (String name) {
            return (Image)icons.get (name);
    }

    /**
     * Map a name to an icon.
     * @param name Name of icon.
     * @param icon Icon image.  If null, mapping is deleted.
     */
    public synchronized void setIcon (String name, Image icon) {
        if (icon != null)
           icons.put (name, icon);
        else
           icons.remove (name);
    }

    /**
     * Set the default icon used for pages.
     * @param icon Icon image.  If null, mapping is deleted.
     */
    public synchronized void setPageIcon (Image icon) {
        pageIcon = icon;
        setIcon (LinkEvent.eventName[LinkEvent.VISITED], icon);
    }

    /**
     * Set the default icon used for links.
     * @param icon Icon image.  If null, mapping is deleted.
     */
    public synchronized void setLinkIcon (Image icon) {
        linkIcon = icon;
        setIcon (LinkEvent.eventName[LinkEvent.QUEUED], icon);
        setIcon (LinkEvent.eventName[LinkEvent.TOO_DEEP], icon);
        setIcon (LinkEvent.eventName[LinkEvent.ALREADY_VISITED], icon);
        setIcon (LinkEvent.eventName[LinkEvent.SKIPPED], icon);
    }

    /**
     * Set the default icon used for requests in progress.
     * @param icon Icon image.  If null, mapping is deleted.
     */
    public synchronized void setRetrievingIcon (Image icon) {
        retrievingIcon = icon;
        setIcon (LinkEvent.eventName[LinkEvent.RETRIEVING], icon);
        setIcon (LinkEvent.eventName[LinkEvent.DOWNLOADED], icon); 
   }

    /**
     * Set the default icon used for failed requests.
     * @param icon Icon image.  If null, mapping is deleted.
     */
    public synchronized void setErrorIcon (Image icon) {
        errorIcon = icon;
        setIcon (LinkEvent.eventName[LinkEvent.ERROR], icon);
    }


    public static Image defaultPageIcon;
    public static Image defaultLinkIcon;
    public static Image defaultRetrievingIcon;
    public static Image defaultErrorIcon;

    static int linkWidth = 17;
    static int linkHeight = 17;
    static int[] linkData = {
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xff343464, 0xff343464, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xff343464, 0xff343464, 
    0xffd4d4fc, 0xffc4c4c4, 0xff343464, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xff343464, 
    0xff343464, 0xff343464, 0xff343464, 0xffd4d4fc, 0xffd4d4fc, 0xffc4c4c4, 
    0xff6464cc, 0xff343464, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xff343464, 0xffccccfc, 0xff848484, 
    0xff343464, 0xffd4d4fc, 0xff848484, 0xff848484, 0xff6464cc, 0xff343464, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xff343464, 0xff343464, 0xffd4d4fc, 0xffc4c4c4, 0xff343464, 0xffd4d4fc, 
    0xffc4c4c4, 0xff6464cc, 0xff6464cc, 0xff343464, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xff343464, 
    0xff343464, 0xffd4d4fc, 0xffc4c4c4, 0xff343464, 0xffd4d4fc, 0xffc4c4c4, 
    0xff6464cc, 0xff6464cc, 0xff343464, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xff343464, 0xffccccfc, 0xffd4d4fc, 
    0xffc4c4c4, 0xff343464, 0xff343464, 0xff6464cc, 0xff6464cc, 0xff343464, 
    0xff343464, 0xff343464, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xff343464, 0xffd4d4fc, 0xffc4c4c4, 0xffc4c4c4, 0xff343464, 
    0xfffcfcfc, 0xfffcfcfc, 0xff343464, 0xff343464, 0xffd4d4fc, 0xffccccfc, 
    0xff343464, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xff343464, 
    0xffccccfc, 0xffc4c4c4, 0xff343464, 0xff343464, 0xfffcfcfc, 0xfffcfcfc, 
    0xff040404, 0xff343464, 0xffccccfc, 0xffc4c4c4, 0xffc4c4c4, 0xff343464, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xff343464, 0xff040404, 
    0xff343464, 0xff343464, 0xff343464, 0xfffcfcfc, 0xff040404, 0xff343464, 
    0xffccccfc, 0xffc4c4c4, 0xff343464, 0xff343464, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xff343464, 0xff343464, 0xffd4d4fc, 
    0xffc4c4c4, 0xffc4c4c4, 0xff343464, 0xff343464, 0xffccccfc, 0xffc4c4c4, 
    0xff343464, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xff343464, 0xffccccfc, 0xff040404, 0xff6464cc, 
    0xff6464cc, 0xff343464, 0xffccccfc, 0xff040404, 0xff343464, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xff343464, 0xffccccfc, 0xff040404, 0xff6464cc, 0xff6464cc, 
    0xff343464, 0xffccccfc, 0xff040404, 0xff343464, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xff343464, 
    0xffccccfc, 0xffc4c4c4, 0xff6464cc, 0xff343464, 0xff343464, 0xffccccfc, 
    0xffc4c4c4, 0xff343464, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xff343464, 0xff040404, 
    0xff6464cc, 0xff343464, 0xff343464, 0xff343464, 0xff343464, 0xff343464, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xff343464, 0xff343464, 0xff343464, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc
    };

    static int pageWidth = 22;
    static int pageHeight = 26;
    static int[] pageData = {
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xff343434, 0xff343434, 
    0xff343434, 0xff343434, 0xff343434, 0xff343434, 0xff343434, 0xff343434, 
    0xff343434, 0xff343434, 0xff343434, 0xff343434, 0xff343434, 0xffffff, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xff343434, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xff343434, 0xfffcfcfc, 0xff343434, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xff343434, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xff343434, 
    0xfffcfcfc, 0xfffcfcfc, 0xff343434, 0xffffff, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xff343434, 0xfffcfcfc, 
    0xfffcfcfc, 0xff343434, 0xff343434, 0xff343434, 0xff343434, 0xff343434, 
    0xff343434, 0xfffcfcfc, 0xfffcfcfc, 0xff343434, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xff343434, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xff343434, 0xfffcfcfc, 0xfffcfcfc, 0xff343434, 
    0xfffccc34, 0xfffccc34, 0xff64ccfc, 0xff64ccfc, 0xff64ccfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xff343434, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xff343434, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xff343434, 0xfffcfcfc, 0xfffcfcfc, 0xff343434, 0xfffccc34, 0xff64ccfc, 
    0xff64ccfc, 0xff64ccfc, 0xff64ccfc, 0xfffcfcfc, 0xfffcfcfc, 0xff040404, 
    0xff343434, 0xff040404, 0xff343434, 0xff040404, 0xff343434, 0xff040404, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xff343434, 0xfffcfcfc, 
    0xfffcfcfc, 0xff343434, 0xff64ccfc, 0xff64ccfc, 0xff64ccfc, 0xff64ccfc, 
    0xff64ccfc, 0xfffcfcfc, 0xfffcfcfc, 0xff040404, 0xff040404, 0xff040404, 
    0xff040404, 0xff040404, 0xff040404, 0xff040404, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xff343434, 0xfffcfcfc, 0xfffcfcfc, 0xff343434, 
    0xff9c6434, 0xff9c6434, 0xff9c6434, 0xff9c6434, 0xff9c6434, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xff9c9c9c, 0xff9c9c9c, 0xff9c9c9c, 
    0xff9c9c9c, 0xff040404, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xff343434, 0xfffcfcfc, 0xfffcfcfc, 0xff343434, 0xff9c6434, 0xff9c6434, 
    0xff9c6434, 0xff9c6434, 0xff9c6434, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xff9c9c9c, 0xff9c9c9c, 0xff9c9c9c, 0xff040404, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xff343434, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xff9c9c9c, 0xff040404, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xff343434, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xff9c9c9c, 0xff040404, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xff343434, 0xfffcfcfc, 0xfffcfcfc, 0xff040404, 0xff040404, 0xff040404, 
    0xff040404, 0xff040404, 0xff040404, 0xff040404, 0xff040404, 0xff040404, 
    0xff040404, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xff9c9c9c, 0xff040404, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xff343434, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xff9c9c9c, 0xff040404, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xff343434, 0xfffcfcfc, 0xfffcfcfc, 0xff040404, 
    0xff040404, 0xff040404, 0xff040404, 0xff040404, 0xff040404, 0xff040404, 
    0xff040404, 0xff040404, 0xff040404, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xff9c9c9c, 0xff040404, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xff343434, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xff9c9c9c, 0xff040404, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xff343434, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffc3434, 0xfffcfcfc, 0xff040404, 
    0xff040404, 0xff040404, 0xff040404, 0xff040404, 0xff040404, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xff9c9c9c, 0xff040404, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xff343434, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xff9c9c9c, 0xff040404, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xff343434, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffc3434, 
    0xfffcfcfc, 0xff040404, 0xff040404, 0xff040404, 0xff040404, 0xff040404, 
    0xff040404, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xff9c9c9c, 0xff040404, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xff343434, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xff9c9c9c, 0xff040404, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xff343434, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 0xfffcfcfc, 
    0xff9c9c9c, 0xff040404, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xff343434, 0xff343434, 0xff9c9c9c, 0xff9c9c9c, 0xff9c9c9c, 0xff9c9c9c, 
    0xff9c9c9c, 0xff9c9c9c, 0xff9c9c9c, 0xff9c9c9c, 0xff9c9c9c, 0xff9c9c9c, 
    0xff9c9c9c, 0xff9c9c9c, 0xff9c9c9c, 0xff9c9c9c, 0xff343434, 0xff040404, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xff040404, 0xff040404, 0xff040404, 0xff040404, 0xff040404, 0xff040404, 
    0xff040404, 0xff040404, 0xff040404, 0xff040404, 0xff040404, 0xff040404, 
    0xff040404, 0xff040404, 0xff040404, 0xff040404, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 0xffffff, 
    0xffffff, 0xffffff
    };

    static int retrieveWidth = 8;
    static int retrieveHeight = 8;
    static int[] retrieveData = {
        0xffffff, 0xffffff, 0xff008000, 0xff008000, 0xff008000, 0xff008000, 
        0xffffff, 0xffffff, 0xffffff, 0xff008000, 0xff008000, 0xff008000, 
        0xff008000, 0xff008000, 0xff008000, 0xffffff, 0xff008000, 0xff008000, 
        0xff008000, 0xff008000, 0xff008000, 0xff008000, 0xff008000, 0xff008000, 
        0xff008000, 0xff008000, 0xff008000, 0xff008000, 0xff008000, 0xff008000, 
        0xff008000, 0xff008000, 0xff008000, 0xff008000, 0xff008000, 0xff008000, 
        0xff008000, 0xff008000, 0xff008000, 0xff008000, 0xff008000, 0xff008000, 
        0xff008000, 0xff008000, 0xff008000, 0xff008000, 0xff008000, 0xff008000, 
        0xffffff, 0xff008000, 0xff008000, 0xff008000, 0xff008000, 0xff008000, 
        0xff008000, 0xffffff, 0xffffff, 0xffffff, 0xff008000, 0xff008000, 
        0xff008000, 0xff008000, 0xffffff, 0xffffff
    };

    static int errorWidth = 8;
    static int errorHeight = 8;
    static int[] errorData = {
    0xfffc0404, 0xfffc0404, 0xfcfcfc, 0xfcfcfc, 0xfcfcfc, 0xfcfcfc, 
    0xfffc0404, 0xfffc0404, 0xfffc0404, 0xfffc0404, 0xfffc0404, 0xfcfcfc, 
    0xfcfcfc, 0xfffc0404, 0xfffc0404, 0xfffc0404, 0xfcfcfc, 0xfffc0404, 
    0xfffc0404, 0xfffc0404, 0xfffc0404, 0xfffc0404, 0xfffc0404, 0xfcfcfc, 
    0xfcfcfc, 0xfcfcfc, 0xfffc0404, 0xfffc0404, 0xfffc0404, 0xfffc0404, 
    0xfcfcfc, 0xfcfcfc, 0xfcfcfc, 0xfcfcfc, 0xfffc0404, 0xfffc0404, 
    0xfffc0404, 0xfffc0404, 0xfcfcfc, 0xfcfcfc, 0xfcfcfc, 0xfffc0404, 
    0xfffc0404, 0xfffc0404, 0xfffc0404, 0xfffc0404, 0xfffc0404, 0xfcfcfc, 
    0xfffc0404, 0xfffc0404, 0xfffc0404, 0xfcfcfc, 0xfcfcfc, 0xfffc0404, 
    0xfffc0404, 0xfffc0404, 0xfffc0404, 0xfffc0404, 0xfcfcfc, 0xfcfcfc, 
    0xfcfcfc, 0xfcfcfc, 0xfffc0404, 0xfffc0404
    };
  
    static {
        Toolkit tkit = Toolkit.getDefaultToolkit ();
        defaultPageIcon = tkit.createImage (
            new MemoryImageSource (pageWidth, pageHeight, 
                                   pageData, 0, pageWidth));
        defaultLinkIcon = tkit.createImage (
            new MemoryImageSource (linkWidth, linkHeight, 
                                   linkData, 0, linkWidth));
        defaultRetrievingIcon = tkit.createImage (
            new MemoryImageSource (retrieveWidth, retrieveHeight, 
                                   retrieveData, 0, retrieveWidth));
        defaultErrorIcon = tkit.createImage (
            new MemoryImageSource (errorWidth, errorHeight, 
                                   errorData, 0, errorWidth));

    }    
}