//
// ComboFileFilter.java
//

/*
VisAD system for interactive analysis and visualization of numerical
data.  Copyright (C) 1996 - 2017 Bill Hibbard, Curtis Rueden, Tom
Rink, Dave Glowacki, Steve Emmerson, Tom Whittaker, Don Murray, and
Tommy Jasmin.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 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
Library General Public License for more details.

You should have received a copy of the GNU Library 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 visad.util;

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

/** A file filter that recognizes files from a union of other filters. */
public class ComboFileFilter extends FileFilter
  implements java.io.FileFilter, Comparable
{

  // -- Fields --

  /** List of filters to be combined. */
  private FileFilter[] filts;

  /** Description. */
  private String desc;

  // -- Constructor --

  /** Constructs a new filter from a list of other filters. */
  public ComboFileFilter(FileFilter[] filters, String description) {
    filts = new FileFilter[filters.length];
    System.arraycopy(filters, 0, filts, 0, filters.length);
    desc = description;
  }

  // -- ComboFileFilter API methods --

  /** Gets the list of file filters forming this filter combination. */
  public FileFilter[] getFilters() {
    FileFilter[] ff = new FileFilter[filts.length];
    System.arraycopy(filts, 0, ff, 0, filts.length);
    return ff;
  }

  // -- Static ComboFileFilter API methods --

  /**
   * Sorts the given list of file filters, and combines filters with identical
   * descriptions into a combination filter that accepts anything any of its
   * constituant filters do.
   */
  public static FileFilter[] sortFilters(FileFilter[] filters) {
    return sortFilters(new Vector(Arrays.asList(filters)));
  }

  /**
   * Sorts the given list of file filters, and combines filters with identical
   * descriptions into a combination filter that accepts anything any of its
   * constituant filters do.
   */
  public static FileFilter[] sortFilters(Vector filters) {
    // sort filters alphanumerically
    Collections.sort(filters);

    // combine matching filters
    int len = filters.size();
    Vector v = new Vector(len);
    for (int i=0; i i + 1) {
        // create combination filter for matching filters
        FileFilter[] temp = new FileFilter[ndx - i];
        for (int j=0; j