filterbuilder.java

本程序用于对页面信息进行提取并分析

        panel.add (toolbar);
        getContentPane().setLayout (new BorderLayout (0,0));
        getContentPane ().add (BorderLayout.NORTH, panel);

        // URL entry
        mURLField = new JTextField ();
        mURLField.setToolTipText ("Enter the URL to view");
//        mTextField.addActionListener (this);
        mURLField.setText ("http://sourceforge.org/projects/htmlparser");
        getContentPane().add (BorderLayout.SOUTH, mURLField);

        // application setup
        setTitle (TITLE);
        setDefaultCloseOperation (WindowConstants.DO_NOTHING_ON_CLOSE);
        setSize (640, 480);
        setVisible (false);

        // main panel
        mMainPanel.setLayout (new NullLayoutManager ());
        mMainScroller = new JScrollPane (
                mMainPanel,
                ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
                ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);

        split = new JSplitPane ();
        pane = new JScrollPane ();
        pane.setViewportView (mMainScroller);
        split.setLeftComponent (pane);

        mOutput = new JDesktopPane ();
        split.setRightComponent (mOutput);

        getContentPane().add (BorderLayout.CENTER, split);

        // shenanigans to get the splitter bar at the midpoint
        setVisible (true);
        split.setDividerLocation (0.5);
        setVisible (false);

        // listeners
        addWindowListener (this);
        setIconImage (Toolkit.getDefaultToolkit ().getImage ("images/program16.gif"));
        addMouseListener (this);
        addMouseMotionListener (this);

        // clipboard buffer
        mSelection = new Vector ();
    }

    /**
     * Creates a new instance of an FilterBuilder environment with the given title.
     * @param title the title for the new frame.
     * @see #FilterBuilder()
     */
    public FilterBuilder (String title)
    {
        this ();
        setTitle (title);
    }

    /**
     * Makes menu and toolbar items for commands.
     * @param name The name of the command.
     * @param description A description for the tooltip.
     * @param text The text for the menu.
     * @param mnemonic The navigation mnemonic.
     * @param key Accelerator key.
     * @param toolbar The toolbar to add the button to.
     * @param menu The menu to add the menu item to.
     */
    protected void makeMenuButton (
            String name,
            String description,
            String text,
            int mnemonic,
            KeyStroke key,
            JToolBar toolbar,
            JMenu menu)
    {
        JButton button;
        JMenuItem item;
        ImageIcon icon;
        String command;

        command = name.toLowerCase ();
        try
        {
            icon = new ImageIcon (getURL ("images/" + command + ".gif"));
        }
        catch (java.net.MalformedURLException error)
        {
            icon = null;
        }

        item = new JMenuItem ();
        item.setText (text);
        item.setActionCommand (command + "Action");
        item.setAccelerator (key);
        item.setMnemonic (mnemonic);
        item.setIcon (icon);
        item.addActionListener (this);
        menu.add (item);

        if (null != toolbar)
        {
            button = new JButton ();
            button.setDefaultCapable (false);
            button.setToolTipText (description);
            button.setMnemonic (mnemonic);
            button.setActionCommand (command + "Action");
            button.setMargin (new Insets (0, 0, 0, 0));
            button.setIcon (icon);
            button.addActionListener (this);
            toolbar.add (button);
        }
    }

    /**
     * Get a url for the given resource specification.
     * @param spec The name of the resource.
     * @return The fully formed URL.
     * @exception MalformedURLException In the case that the document base
     * or name of the resource cannot be turned into a URL.
     */
    protected URL getURL (String spec)
        throws MalformedURLException
    {
        URL ret;

        if (null == (ret = getClass ().getResource (spec)))
            if ((null != mDocumentBase) && (-1 == spec.indexOf ("//")))
                ret =  new URL (mDocumentBase, spec);
            else
                ret = new URL (spec);

        return ret;
    }

    /**
     * Creates a new button for the given class.
     * @param class_name The name of the Filter class.
     * @return A fully functional button with name, tool tip,
     * icon and drag recognizer.
     */
    public JButton makeFilterButton (String class_name)
    {
        Filter filter;
        JButton ret;

        ret = new JButton ();
        filter = Filter.instantiate (class_name);
        if (null != filter)
        {
            ret.setName (class_name); // filter.getNodeFilter ().getClass ().getName ());
            ret.setToolTipText (filter.getDescription ());
            ret.setMargin (new Insets (0, 0, 0, 0));
            ret.setIcon (filter.getIcon ());
            mDragSource.createDefaultDragGestureRecognizer (
                ret,
                DnDConstants.ACTION_MOVE,
                this);
            ret.setActionCommand ("filterAction");
            ret.addActionListener (this);
        }
        
        return (ret);
    }

    /**
     * Add a filter to the GUI.
     * Adds the filter specified by class_name to the menu, toolbar and
     * starts listening for actions.
     * @param menu The menu to add the filter to.
     * @param toolbar The toolbar to add the filter to.
     * @param class_name The class name for the filter wrapper.
     * From the wrapper, the NodeFilter, description and icon can be obtained.
     */
    public void addFilter (JMenu menu, JToolBar toolbar, String class_name)
    {
        Filter filter;

        filter = Filter.instantiate (class_name);
        if (null != filter)
        {
            String name;
            String description;
            Icon icon;
            String text;
            JMenuItem item;

            name = filter.getNodeFilter ().getClass ().getName ();
            description = filter.getDescription ();
            icon = filter.getIcon ();
            text = name.substring (name.lastIndexOf ('.') + 1);

            item = new JMenuItem ();
            item.setName (class_name);
            item.setText (text);
            item.setActionCommand ("filterAction");
//            item.setAccelerator (key);
//            item.setMnemonic (mnemonic);
            item.setToolTipText (description);
            item.setIcon (icon);
            item.addActionListener (this);
            menu.add (item);
            
            toolbar.add (makeFilterButton (class_name));
        }
    }

    /**
     * Adds a set of filters to the main panel or a sublist.
     * Sets up the GUI components as drop targets and mouse listeners,
     * and performs a relayout to display them.
     * @param filters The filter wrappers to add.
     * @param point The point at which to start adding (list == null).
     * @param list The list to add to (point not used), or <code>null</code>
     * for the main panel.
     */
    protected void insertFilters (Filter[] filters, Point point, SubFilterList list)
    {
        Dimension dimension;

        if (null == list)
        {
            for (int i = 0; i < filters.length; i++)
            {
	            filters[i].setLocation (point);
	            mMainPanel.add (filters[i]);
	            dimension = filters[i].getPreferredSize ();
	            point.y += dimension.height;
            }
        }
        else
            for (int i = 0; i < filters.length; i++)
                list.addFilter (filters[i]);
        setupDropTargets (filters);
        setupMouseListeners (filters);
        relayout ();
    }

    /**
     * Sets the position of the mouse in the component.
     * 
     * @param point The point where the mouse position is.
     */
    protected void setBasePoint (Point point)
    {
        mBasePoint = point;
    }
    
    /**
     * Gets the current base point of the mouse pointer.
     * This value is used to offset the drag position
     * to maintain the mouse position at the same
     * relative position within the card while dragging.
     * 
     * @return The current base point of the mouse pointer.
     */
    protected Point getBasePoint ()
    {
        return (mBasePoint);
    }

    /**
     * Get the enclosing sub filter list if any.
     * @param component The component that's supposedly enclosed.
     * @return The enclosing component or <code>null</code> otherwise.
     */
    protected SubFilterList getEnclosing (Component component)
    {
        do
            component = component.getParent ();
        while (     (null != component)
                && !(component instanceof SubFilterList));

        return ((SubFilterList)component);
    }

    /**
     * Get the enclosed sub filter list if any.
     * @param component The component that's supposedly enclosing the list.
     * @return The enclosed component or <code>null</code> otherwise.
     */
    protected SubFilterList getEnclosed (Component component)
    {
        Component[] list;

        if (component instanceof Container)
        {
            list = ((Container)component).getComponents  ();
            for (int i = 0; i < list.length; i++)
                if (list[i] instanceof SubFilterList)
                    return ((SubFilterList)list[i]);
        }

        return (null);
    }


    /**
     * Makes a program like:
     * <pre>
     * // Generated by FilterBuilder. http://htmlparser.org
     * // [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]
     *                                                                                                                                                         
     * import org.htmlparser.*;
     * import org.htmlparser.filters.*;
     * import org.htmlparser.beans.*;
     * import org.htmlparser.util.*;
     *                                                                                                                                                         
     * public class Test
     * {
     *     public static void main (String args[])
     *     {
     *         TagNameFilter filter0 = new TagNameFilter ();
     *         filter0.setName ("META");
     *         HasAttributeFilter filter1 = new HasAttributeFilter ();
     *         filter1.setAttributeName ("name");
     *         NodeFilter[] array0 = new NodeFilter[2];
     *         array0[0] = filter0;
     *         array0[1] = filter1;
     *         AndFilter filter2 = new AndFilter ();
     *         filter2.setPredicates (array0);
     *         NodeFilter[] array1 = new NodeFilter[1];
     *         array1[0] = filter2;
     *         FilterBean bean = new FilterBean ();
     *         bean.setFilters (array1);
     *         if (0 != args.length)
     *         {
     *             bean.setURL (args[0]);
     *             System.out.println (bean.getNodes ().toHtml ());
     *         }
     *         else
     *             System.out.println ("Usage: java -classpath .:htmlparser.jar Test <url>");
     *     }
     * }
     * </pre>
     * @param name The name of the class. 
     * @param out The buffer to append to.
     * @param bean The bean to extract the filters from to make the program.
     */
    protected void makeProgram (String name, StringBuffer out, FilterBean bean)
    {
        // so we need to keep track of filters and arrays of filters to give them unique numbers
        // each Filter is responsible for outputting it's code and returning it's variable name
        int[] context; // 0 - indent, 1 - next filter variable #, 2 - next array of filters variable #
        String[] names;
        Filter[] filters;
        String array;

        filters = (Filter[])bean.getFilters ();

        context = new int[3];
        context[0] = 0;

        Filter.spaces (out, context[0]);
        out.append ("// Generated by FilterBuilder. http://htmlparser.org");
        Filter.newline (out);
        Filter.spaces (out, context[0]);
        out.append ("// ");
        try
        {
            out.append (Filter.deconstitute (filters));
        }
        catch (IOException ioe)
        {
            ioe.printStackTrace ();
        }
        Filter.newline (out);
        Filter.newline (out);

        Filter.spaces (out, context[0]);
        out.append ("import org.htmlparser.*;");
        Filter.newline (out);
        Filter.spaces (out, context[0]);
        out.append ("import org.htmlparser.filters.*;");
        Filter.newline (out);
        Filter.spaces (out, context[0]);
        out.append ("import org.htmlparser.beans.*;");
        Filter.newline (out);
        Filter.spaces (out, context[0]);
        out.append ("import org.htmlparser.util.*;");
        Filter.newline (out);
        Filter.newline (out);

        Filter.spaces (out, context[0]);