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/* AccessibleStateSet.java -- the combined state of an accessible object

   Copyright (C) 2002, 2005 Free Software Foundation

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath 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

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package javax.accessibility;

import gnu.java.lang.CPStringBuilder;

import java.util.Locale;

import java.util.Vector;

/**

 * Describes all elements of an accessible object's state. For example, an

 * object may be enabled and have focus.

 *

 * @author Eric Blake (ebb9@email.byu.edu)

 * @see AccessibleState

 * @since 1.2

 * @status updated to 1.4

 */

public class AccessibleStateSet

{

  /**

   * The list of states, should be instances of AccessibleState. Don't set

   * this to null.

   *

   * @see #add(AccessibleState)

   * @see #addAll(AccessibleState[])

   * @see #remove(AccessibleState)

   * @see #contains(AccessibleState)

   * @see #toArray()

   * @see #clear()

   */

  protected Vector<AccessibleState> states = new Vector<AccessibleState>();

  /**

   * Create an empty state set.

   */

  public AccessibleStateSet()

  {

  }

  /**

   * Create a state set initialized with the given states, duplicates are

   * ignored.

   *

   * @param states the states to insert

   * @throws NullPointerException if states is null

   */

  public AccessibleStateSet(AccessibleState[] states)

  {

    addAll(states);

  }

  /**

   * Add a new state to the current set. Return true if the state was added,

   * as duplicates are ignored. Entering a null state will cause problems

   * later, so don't do it.

   *

   * @param state the state to add

   * @return true if the state was added

   */

  public boolean add(AccessibleState state)

  {

    return states.contains(state) ? false : states.add(state);

  }

  /**

   * Add all of the states to the current set. Duplicates are ignored.

   * Entering a null state will cause problems later, so don't do it.

   *

   * @param array the array of states to add

   * @throws NullPointerException if array is null

   */

  public void addAll(AccessibleState[] array)

  {

    int i = array.length;

    while (--i >= 0)

      add(array[i]);

  }

  /**

   * Remove a state from the set. If a state was removed, return true.

   *

   * @param state the state to remove

   * @return true if the set changed

   */

  public boolean remove(AccessibleState state)

  {

    return states.remove(state);

  }

  /**

   * Clear all states in the set.

   */

  public void clear()

  {

    states.clear();

  }

  /**

   * Check if the current state is in the set.

   *

   * @param state the state to locate

   * @return true if it is in the set

   */

  public boolean contains(AccessibleState state)

  {

    return states.contains(state);

  }

  /**

   * Return the state set as an array.

   *

   * @return an array of the current states

   */

  public AccessibleState[] toArray()

  {

    AccessibleState[] result = new AccessibleState[states.size()];

    states.toArray(result);

    return result;

  }

  /**

   * Return a localized, comma-separated string representing all states

   * in the set. This is in arbitrary order.

   *

   * @return the string representation

   * @see AccessibleBundle#toDisplayString(String, Locale)

   */

  public String toString()

  {

    int i = states.size();

    if (i == 0)

      return "";

    // Pre-allocate an average of 10 chars per state.

    CPStringBuilder b = new CPStringBuilder(i * 10);

    while (--i >= 0)

      b.append(states.get(i)).append(',');

    return b.substring(0, b.length() - 1);

  }

} // class AccessibleStateSet