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dbUnit is a JUnit extension (also usable from Ant and Maven) targeted for database-driven projects that, among other things, puts your database into a known state between test runs. This is an excellent way to avoid the myriad of problems that can occur when one test case corrupts the database and causes subsequent tests to fail or exacerbate the damage.

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/*
 *
 * The DbUnit Database Testing Framework
 * Copyright (C)2005, DbUnit.org
 *
 * 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.dbunit.util;

import java.util.Iterator;
import java.util.Set;

import org.apache.commons.collections.set.ListOrderedSet;

/**
 * Helper for collections-related methods.
 * 

 * @author Felipe Leme 
 * @version $Revision: 499 $
 * @since Nov 5, 2005
 * 
 */

public class CollectionsHelper {
  
  // class is "static"
  private CollectionsHelper() {}

  /**
   * Returns a Set from an array of objects.
   * Note the Iterator returned by this Set mantains the order of the array.
   * @param objects array of objects
   * @return Set with the elements of the array or null if entry is null
   */
  public static Set objectsToSet( Object[] objects ) {
    if ( objects == null ) {
      return null;
    }
    Set set = new ListOrderedSet();
    for (int i = 0; i < objects.length; i++) {
      set.add(objects[i]);
    }
    return set;
  }

  /**
   * Returns an array of Objects from a Set.
   * @param a Set 
   * @return array of Objects with the elements of the Set or null if set is null
   */
  public static Object[] setToObjects( Set set ) {
    if ( set == null ) {
      return null;
    }
    Object[] objects = new Object[ set.size() ];
    int i=0;
    for (Iterator iter = set.iterator(); iter.hasNext(); i++) {
      objects[i] = iter.next();      
    }
    return objects;
  }

  /**
   * Returns an array of Strings from a Set.
   * @param a Set of Strings
   * @return array of Strings with the elements of the Set or null if set is null
   */
  public static String[] setToStrings( Set set ) {
    if ( set == null ) {
      return null;
    }
    String[] strings = new String[ set.size() ];
    int i=0;
    for (Iterator iter = set.iterator(); iter.hasNext(); i++) {
      strings[i] = (String) iter.next();      
    }
    return strings;
  };

}