tn5250j/src/org/tn5250j/gui TN5250jFileFilter.java,NONE,1.1

Update of /cvsroot/tn5250j/tn5250j/src/org/tn5250j/gui
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv24895/src/org/tn5250j/gui

Added Files:
	TN5250jFileFilter.java 
Log Message:
Submitted by: Kenneth
Various updates to update CVS with actual code

--- NEW FILE: TN5250jFileFilter.java ---
/**
 *
 * A convenience implementation of FileFilter that filters out
 * all files except for those type extensions that it knows about.
 *
 * Example - create a new filter that filerts out all files
 * but gif and jpg image files:
 *
 *     JFileChooser chooser = new JFileChooser();
 *     TN5250jFileFilter filter = new TN5250jFileFilter(
 *                   new String{"gif", "jpg"}, "JPEG & GIF Images")
 *     chooser.addChoosableFileFilter(filter);
 *     chooser.showOpenDialog(this);
 *
 */
package org.tn5250j.gui;

import java.io.File;
import javax.swing.filechooser.*;
import java.util.*;

public class TN5250jFileFilter extends FileFilter {

//   private String TYPE_UNKNOWN = "Type Unknown";
//   private String HIDDEN_FILE = "Hidden File";

   private Hashtable filters = null;
   private String description = null;
   private String fullDescription = null;
   private boolean useExtensionsInDescription = true;

   /**
   * Creates a file filter. If no filters are added, then all
   * files are accepted.
   *
   * @see #addExtension
   */
   public TN5250jFileFilter() {
      this.filters = new Hashtable(5);
   }

   /**
   * Creates a file filter that accepts files with the given extension.
   * Example: new TN5250jFileFilter("jpg");
   *
   * @see #addExtension
   */
   public TN5250jFileFilter(String extension) {
      this(extension,null);
   }

   /**
   * Creates a file filter that accepts the given file type.
   * Example: new TN5250jFileFilter("jpg", "JPEG Image Images");
   *
   * Note that the "." before the extension is not needed. If
   * provided, it will be ignored.
   *
   * @see #addExtension
   */
   public TN5250jFileFilter(String extension, String description) {
      this();
      if(extension!=null)
         addExtension(extension);
      if(description!=null)
         setDescription(description);
   }

   /**
   * Creates a file filter from the given string array.
   * Example: new TN5250jFileFilter(String {"gif", "jpg"});
   *
   * Note that the "." before the extension is not needed adn
   * will be ignored.
   *
   * @see #addExtension
   */
   public TN5250jFileFilter(String[] filters) {
      this(filters, null);
   }

   /**
   * Creates a file filter from the given string array and description.
   * Example: new TN5250jFileFilter(String {"gif", "jpg"}, "Gif and JPG Images");
   *
   * Note that the "." before the extension is not needed and will be ignored.
   *
   * @see #addExtension
   */
   public TN5250jFileFilter(String[] filters, String description) {
      this();
      for (int i = 0; i < filters.length; i++) {
       // add filters one by one
       addExtension(filters[i]);
      }
      if(description!=null)
         setDescription(description);
   }

   /**
   * Return true if this file should be shown in the directory pane,
   * false if it shouldn't.
   *
   * Files that begin with "." are ignored.
   *
   * @see #getExtension
   * @see FileFilter#accepts
   */
   public boolean accept(File f) {
      if(f != null) {
         if(f.isDirectory()) {
            return true;
         }
         String extension = getExtension(f);
         if(extension != null && filters.get(getExtension(f)) != null) {
            return true;
         }
      }
      return false;
   }

   /**
   * Return the extension portion of the file's name .
   *
   * @see #getExtension
   * @see FileFilter#accept
   */
   public String getExtension(File f) {
      if(f != null) {
         return getExtension(f.getName());
      }
      return null;
   }

   public String getExtension(String filename) {

      if(filename != null) {
         int i = filename.lastIndexOf('.');
         if(i>0 && i<filename.length()-1) {
            return filename.substring(i+1).toLowerCase();
         }
      }
      return null;
   }

  /**
   * Adds a filetype "dot" extension to filter against.
   *
   * For example: the following code will create a filter that filters
   * out all files except those that end in ".jpg" and ".tif":
   *
   *   TN5250jFileFilter filter = new TN5250jFileFilter();
   *   filter.addExtension("jpg");
   *   filter.addExtension("tif");
   *
   * Note that the "." before the extension is not needed and will be ignored.
   */
   public void addExtension(String extension) {
      if(filters == null) {
         filters = new Hashtable(5);
      }
      filters.put(extension.toLowerCase(), this);
      fullDescription = null;
   }


   /**
   * Returns the human readable description of this filter. For
   * example: "JPEG and GIF Image Files (*.jpg, *.gif)"
   *
   * @see setDescription
   * @see setExtensionListInDescription
   * @see isExtensionListInDescription
   * @see FileFilter#getDescription
   */
   public String getDescription() {
      if(fullDescription == null) {
         if(description == null || isExtensionListInDescription()) {
            fullDescription = description==null ? "(" : description + " (";
            // build the description from the extension list
            Enumeration extensions = filters.keys();
            if(extensions != null) {
               fullDescription += "." + (String) extensions.nextElement();
               while (extensions.hasMoreElements()) {
                  fullDescription += ", ." + (String) extensions.nextElement();
               }
            }
            fullDescription += ")";
            } else {
               fullDescription = description;
            }
      }
      return fullDescription;
   }

   /**
   * Sets the human readable description of this filter. For
   * example: filter.setDescription("Gif and JPG Images");
   *
   * @see setDescription
   * @see setExtensionListInDescription
   * @see isExtensionListInDescription
   */
   public void setDescription(String description) {
      this.description = description;
      fullDescription = null;
   }

   /**
   * Determines whether the extension list (.jpg, .gif, etc) should
   * show up in the human readable description.
   *
   * Only relevent if a description was provided in the constructor
   * or using setDescription();
   *
   * @see getDescription
   * @see setDescription
   * @see isExtensionListInDescription
   */
   public void setExtensionListInDescription(boolean b) {
      useExtensionsInDescription = b;
      fullDescription = null;
   }

   /**
   * Returns whether the extension list (.jpg, .gif, etc) should
   * show up in the human readable description.
   *
   * Only relevent if a description was provided in the constructor
   * or using setDescription();
   *
   * @see getDescription
   * @see setDescription
   * @see setExtensionListInDescription
   */
   public boolean isExtensionListInDescription() {
      return useExtensionsInDescription;
   }

   /**
    * Set the extension to be used for this type if one is not provided
    *    This will append the first key of the filter contained in the list
    */
   public String setExtension(File f) {

      return setExtension(f.getAbsolutePath());
   }

   public String setExtension(String f) {

      if (f != null & getExtension(f) == null) {
         Enumeration e = filters.keys();
         String ext = (String)e.nextElement();
         // just a little extra check for html documents
         if (ext.equals("htm"))
            ext = "html";
         f += "." + ext.toLowerCase();
      }
      return f;
   }

}



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