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/* CollectionCertStoreParameters -- collection-based cert store parameters

   Copyright (C) 2003 Free Software Foundation, Inc.

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 java.security.cert;

import java.util.ArrayList;

import java.util.Collection;

import java.util.Collections;

/**

 * An implementation of {@link CertStoreParameters} with a simple,

 * in-memory {@link Collection} of certificates and certificate

 * revocation list.

 *

 * <p>Note that this class is not thread-safe, and its underlying

 * collection may be changed at any time.

 *

 * @see CertStore

 * @since 1.4

 */

public class CollectionCertStoreParameters implements CertStoreParameters

{

  // Constants and fields.

  // ------------------------------------------------------------------------

  /** The underlying collection. */

  private final Collection collection;

  // Constructors.

  // ------------------------------------------------------------------------

  /**

   * Creates a new CollectionCertStoreParameters with an empty,

   * immutable collection.

   */

  public CollectionCertStoreParameters()

  {

    this(Collections.EMPTY_LIST);

  }

  /**

   * Create a new CollectionCertStoreParameters with the specified

   * collection. The argument is not copied, and subsequent changes to

   * the collection will change this class's collection.

   *

   * @param collection The collection.

   * @throws NullPointerException If <i>collection</i> is null.

   */

  public CollectionCertStoreParameters(Collection<?> collection)

  {

    if (collection == null)

      throw new NullPointerException();

    this.collection = collection;

  }

  // Instance methods.

  // ------------------------------------------------------------------------

  public Object clone()

  {

    return new CollectionCertStoreParameters(new ArrayList(collection));

  }

  /**

   * Return the underlying collection. The collection is not copied

   * before being returned, so callers may update the collection that is

   * returned.

   *

   * @return The collection.

   */

  public Collection<?> getCollection()

  {

    return collection;

  }

  /**

   * Return a string representation of these parameters.

   *

   * @return The string representation of these parameters.

   */

  public String toString()

  {

    return "CollectionCertStoreParameters: [ collection: "

      + collection + " ]";

  }

}