// HTMLParser Library $Name: v1_6 $ - A java-based parser for HTML// http://sourceforge.org/projects/htmlparser// Copyright (C) 2005 Derrick Oswald//// Revision Control Information//// $Source: /cvsroot/htmlparser/htmlparser/src/org/htmlparser/parserapplications/filterbuilder/wrappers/RegexFilterWrapper.java,v $// $Author: derrickoswald $// $Date: 2005/04/12 11:27:42 $// $Revision: 1.2 $//// This library is free software; you can redistribute it and/or// modify it under the terms of the GNU Lesser General Public// License as published by the Free Software Foundation; either// version 2.1 of the License, or (at your option) any later version.//// This library is distributed in the hope that it will be useful,// but WITHOUT ANY WARRANTY; without even the implied warranty of// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU// Lesser General Public License for more details.//// You should have received a copy of the GNU Lesser General Public// License along with this library; if not, write to the Free Software// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA//package org.htmlparser.parserapplications.filterbuilder.wrappers;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JComboBox;import javax.swing.JTextArea;import javax.swing.border.BevelBorder;import javax.swing.event.DocumentEvent;import javax.swing.event.DocumentListener;import javax.swing.text.BadLocationException;import javax.swing.text.Document;import org.htmlparser.Node;import org.htmlparser.NodeFilter;import org.htmlparser.Parser;import org.htmlparser.filters.RegexFilter;import org.htmlparser.parserapplications.filterbuilder.Filter;/** * Wrapper for RegexFilters. */public class RegexFilterWrapper    extends        Filter    implements        ActionListener,        DocumentListener{    /**     * Mapping for RegexFilter constants to strings.     */    public static Object[][] mMap;    static    {        mMap = new Object[3][];        mMap[0] = new Object[2];        mMap[0][0] = "MATCH";        mMap[0][1] = new Integer (RegexFilter.MATCH);        mMap[1] = new Object[2];        mMap[1][0] = "LOOKINGAT";        mMap[1][1] = new Integer (RegexFilter.LOOKINGAT);        mMap[2] = new Object[2];        mMap[2][0] = "FIND";        mMap[2][1] = new Integer (RegexFilter.FIND);    }    /**     * The underlying filter.     */    protected RegexFilter mFilter;    /**     * Text to check for     */    protected JTextArea mPattern;    /**     * Combo box for strategy.     */    protected JComboBox mStrategy;    /**     * Create a wrapper over a new RegexFilter.     */     public RegexFilterWrapper ()    {        mFilter = new RegexFilter ();        // add the text pattern        mPattern = new JTextArea (2, 20);        mPattern.setBorder (new BevelBorder (BevelBorder.LOWERED));        add (mPattern);        mPattern.getDocument ().addDocumentListener (this);        mPattern.setText (mFilter.getPattern ());        // add the strategy choice        mStrategy = new JComboBox ();        mStrategy.addItem ("MATCH");        mStrategy.addItem ("LOOKINGAT");        mStrategy.addItem ("FIND");        add (mStrategy);        mStrategy.addActionListener (this);        mStrategy.setSelectedIndex (strategyToIndex (mFilter.getStrategy ()));    }    //    // Filter overrides and concrete implementations    //    /**     * Get the name of the filter.     * @return A descriptive name for the filter.     */    public String getDescription ()    {        return ("Nodes containing regex");    }    /**     * Get the resource name for the icon.     * @return The icon resource specification.     */    public String getIconSpec ()    {        return ("images/RegexFilter.gif");    }    /**     * Get the underlying node filter object.     * @return The node filter object suitable for serialization.     */    public NodeFilter getNodeFilter ()    {        RegexFilter ret;                ret = new RegexFilter ();        ret.setStrategy (mFilter.getStrategy ());        ret.setPattern (mFilter.getPattern ());                    return (ret);    }    /**     * Assign the underlying node filter for this wrapper.     * @param filter The filter to wrap.     * @param context The parser to use for conditioning this filter.     * Some filters need contextual information to provide to the user,     * i.e. for tag names or attribute names or values,     * so the Parser context is provided.      */    public void setNodeFilter (NodeFilter filter, Parser context)    {        mFilter = (RegexFilter)filter;        mPattern.setText (mFilter.getPattern ());        mStrategy.setSelectedIndex (strategyToIndex (mFilter.getStrategy ()));    }    /**     * Get the underlying node filter's subordinate filters.     * @return The node filter object's contained filters.     */    public NodeFilter[] getSubNodeFilters ()    {        return (new NodeFilter[0]);    }    /**     * Assign the underlying node filter's subordinate filters.     * @param filters The filters to insert into the underlying node filter.     */    public void setSubNodeFilters (NodeFilter[] filters)    {        // should we complain?    }    /**     * Convert this filter into Java code.     * Output whatever text necessary and return the variable name.     * @param out The output buffer.     * @param context Three integers as follows:     * <li>indent level - the number of spaces to insert at the beginning of each line</li>     * <li>filter number - the next available filter number</li>     * <li>filter array number - the next available array of filters number</li>     * @return The variable name to use when referencing this filter (usually "filter" + context[1]++)      */    public String toJavaCode (StringBuffer out, int[] context)    {        String ret;        ret = "filter" + context[1]++;        spaces (out, context[0]);        out.append ("RegexFilter ");        out.append (ret);        out.append (" = new RegexFilter ();");        newline (out);        spaces (out, context[0]);        out.append (ret);        out.append (".setStrategy (RegexFilter.");        out.append (strategyToString (mFilter.getStrategy ()));        out.append (");");        newline (out);        spaces (out, context[0]);        out.append (ret);        out.append (".setPattern (\"");        out.append (mFilter.getPattern ());        out.append ("\");");        newline (out);                return (ret);    }    /**     * Convert the regex strategy to a string.     * @param strategy The regex strategy.     * @return A string for display in the GUI or in the Java program.     */    public String strategyToString (int strategy)    {        for (int i =0; i < mMap.length; i++)            if (strategy == ((Integer)mMap[i][1]).intValue ())                return ((String)mMap[i][0]);        throw new IllegalArgumentException ("unknown strategy constant - " + strategy);    }    /**     * Convert a string to a regex strategy.     * @param strategy The string equivalent of a regex strategy.     * @return The regex strategy to use in executing the regular expression.     */    public int stringToStrategy (String strategy)    {        for (int i =0; i < mMap.length; i++)            if (strategy.equalsIgnoreCase ((String)mMap[i][0]))                return (((Integer)mMap[i][1]).intValue ());        throw new IllegalArgumentException ("unknown strategy constant - " + strategy);    }    /**     * Convert the regex strategy to an index into the map.     * @param strategy The regex strategy.     * @return The index of the regex strategy in the map.     */    public int strategyToIndex (int strategy)    {        for (int i =0; i < mMap.length; i++)            if (strategy == ((Integer)mMap[i][1]).intValue ())                return (i);        throw new IllegalArgumentException ("unknown strategy constant - " + strategy);    }    /**     * Convert an index into a regex strategy.     * @param index The index of the regex strategy in the map.     * @return The regex strategy at that inxdex.     */    public int indexToStrategy (int index)    {        return (((Integer)mMap[index][1]).intValue ());    }    //    // NodeFilter interface    //    /**     * Predicate to determine whether or not to keep the given node.     * The behaviour based on this outcome is determined by the context     * in which it is called. It may lead to the node being added to a list     * or printed out. See the calling routine for details.     * @return <code>true</code> if the node is to be kept, <code>false</code>     * if it is to be discarded.     * @param node The node to test.     */    public boolean accept (Node node)    {        return (mFilter.accept (node));    }    //    // ActionListener interface    //    /**     * Invoked when an action occurs on the combo box.     * @param event Details about the action event.     */    public void actionPerformed (ActionEvent event)    {        Object source;        source = event.getSource ();        if (source == mStrategy)            mFilter.setStrategy (indexToStrategy (mStrategy.getSelectedIndex ()));    }    //    // DocumentListener interface    //    /**     * Handle an insert update event.     * @param e Details about the insert event.     */    public void insertUpdate (DocumentEvent e)    {        Document doc;                doc = e.getDocument ();        try        {            mFilter.setPattern (doc.getText (0, doc.getLength ()));        }        catch (BadLocationException ble)        {            ble.printStackTrace ();        }    }    /**     * Handle a remove update event.     * @param e Details about the remove event.     */    public void removeUpdate (DocumentEvent e)    {        Document doc;                doc = e.getDocument ();        try        {            mFilter.setPattern (doc.getText (0, doc.getLength ()));        }        catch (BadLocationException ble)        {            ble.printStackTrace ();        }    }    /**     * Handle a change update event.     * @param e Details about the change event.     */    public void changedUpdate (DocumentEvent e)    {        // plain text components don't fire these events    }}