content: /*
   * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code 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
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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   * questions.
   */
  
  package java.security.cert;
  
  import java.io.Serializable;
  import java.util.Collection;
  import java.util.Collections;
  
  /**
   * Parameters used as input for the Collection {@code CertStore}
   * algorithm.
   * <p>
   * This class is used to provide necessary configuration parameters
   * to implementations of the Collection {@code CertStore}
   * algorithm. The only parameter included in this class is the
   * {@code Collection} from which the {@code CertStore} will
   * retrieve certificates and CRLs.
   * <p>
   * <b>Concurrent Access</b>
   * <p>
   * Unless otherwise specified, the methods defined in this class are not
   * thread-safe. Multiple threads that need to access a single
   * object concurrently should synchronize amongst themselves and
   * provide the necessary locking. Multiple threads each manipulating
   * separate objects need not synchronize.
   *
   * @since       1.4
   * @author      Steve Hanna
   * @see         Collection
   * @see         CertStore
   */
  public class CollectionCertStoreParameters
      implements CertStoreParameters {
  
      private Collection<?> coll;
  
      /**
       * Creates an instance of {@code CollectionCertStoreParameters}
       * which will allow certificates and CRLs to be retrieved from the
       * specified {@code Collection}. If the specified
       * {@code Collection} contains an object that is not a
       * {@code Certificate} or {@code CRL}, that object will be
       * ignored by the Collection {@code CertStore}.
       * <p>
       * The {@code Collection} is <b>not</b> copied. Instead, a
       * reference is used. This allows the caller to subsequently add or
       * remove {@code Certificates} or {@code CRL}s from the
       * {@code Collection}, thus changing the set of
       * {@code Certificates} or {@code CRL}s available to the
       * Collection {@code CertStore}. The Collection {@code CertStore}
       * will not modify the contents of the {@code Collection}.
       * <p>
       * If the {@code Collection} will be modified by one thread while
       * another thread is calling a method of a Collection {@code CertStore}
       * that has been initialized with this {@code Collection}, the
       * {@code Collection} must have fail-fast iterators.
       *
       * @param collection a {@code Collection} of
       *        {@code Certificate}s and {@code CRL}s
       * @exception NullPointerException if {@code collection} is
       * {@code null}
       */
      public CollectionCertStoreParameters(Collection<?> collection) {
          if (collection == null)
              throw new NullPointerException();
          coll = collection;
      }
  
      /**
       * Creates an instance of {@code CollectionCertStoreParameters} with
       * the default parameter values (an empty and immutable
       * {@code Collection}).
       */
      public CollectionCertStoreParameters() {
          coll = Collections.EMPTY_SET;
      }
  
      /**
       * Returns the {@code Collection} from which {@code Certificate}s
       * and {@code CRL}s are retrieved. This is <b>not</b> a copy of the
       * {@code Collection}, it is a reference. This allows the caller to
       * subsequently add or remove {@code Certificates} or
       * {@code CRL}s from the {@code Collection}.
       *
       * @return the {@code Collection} (never null)
       */
      public Collection<?> getCollection() {
          return coll;
      }
  
      /**
       * Returns a copy of this object. Note that only a reference to the
       * {@code Collection} is copied, and not the contents.
       *
       * @return the copy
       */
      public Object clone() {
          try {
              return super.clone();
          } catch (CloneNotSupportedException e) {
              /* Cannot happen */
              throw new InternalError(e.toString(), e);
          }
      }
  
      /**
       * Returns a formatted string describing the parameters.
       *
       * @return a formatted string describing the parameters
       */
      public String toString() {
          StringBuffer sb = new StringBuffer();
          sb.append("CollectionCertStoreParameters: [\n");
          sb.append("  collection: " + coll + "\n");
          sb.append("]");
          return sb.toString();
      }
  }
  