FileExtensionFilter.java

package ij.io;
import java.awt.*;
import java.awt.image.*;
import java.io.*;
import java.net.URL;
import java.net.*;
import java.util.zip.*;
import java.util.Locale;
import javax.swing.*;
import javax.swing.filechooser.*;
import ij.*;
import ij.gui.*;
import ij.process.*;
import ij.plugin.frame.*;
import ij.text.TextWindow;
import ij.util.Java2;
import java.util.LinkedList;
import java.util.Iterator;

public class FileExtensionFilter extends javax.swing.filechooser.FileFilter
{
    private String[] _extensions = null;
    private String _description = "";
    private boolean _showExtensions = true;

    FileExtensionFilter(String description, String[] extensions) 
    {
        this._description = description;
        this._extensions = extensions;
    }

    FileExtensionFilter(String description, LinkedList extensions) 
    {
        String[] exts = new String[extensions.size()];
        int i=0;
        for (Iterator itr = extensions.iterator(); itr.hasNext(); i++) {
            exts[i] = (String)itr.next();
        }
        this._description = description;
        this._extensions = exts;
    }

    
    public boolean accept(File f) 
    {
        if (f.isDirectory()) return true;
        String extension = f.getPath();
        extension = extension.substring(extension.lastIndexOf(".")+1).toLowerCase();
        for (int i=0; i < _extensions.length; i++) {
            if (extension.equalsIgnoreCase(_extensions[i])) {
                return true;
            }
        }
        return false;
    }

    public String getDescription() 
    {
        return _description + (_showExtensions ? " (" + _getExtensionList() + ")" : "");
    }

    private String _getExtensionList() 
    {
        StringBuffer sb = new StringBuffer();
        for (int i=0; i < _extensions.length; i++) {
            sb.append("*.");
            sb.append(_extensions[i]);
            sb.append(", ");
        }
        return sb.substring(0, sb.length()-2); // remove the final comma
    }

    public String[] getExtensions() 
    {
        return _extensions;
    }

    public void setShowExtensions(boolean b) 
    {
        _showExtensions = b;
    }

}