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   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
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   * 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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   */
  package java.security.spec;
  
  /**
   * This immutable class specifies an elliptic curve public key with
   * its associated parameters.
   *
   * @see KeySpec
   * @see ECPoint
   * @see ECParameterSpec
   *
   * @author Valerie Peng
   *
   * @since 1.5
   */
  public class ECPublicKeySpec implements KeySpec {
  
      private ECPoint w;
      private ECParameterSpec params;
  
      /**
       * Creates a new ECPublicKeySpec with the specified
       * parameter values.
       * @param w the public point.
       * @param params the associated elliptic curve domain
       * parameters.
       * @exception NullPointerException if {@code w}
       * or {@code params} is null.
       * @exception IllegalArgumentException if {@code w}
       * is point at infinity, i.e. ECPoint.POINT_INFINITY
       */
      public ECPublicKeySpec(ECPoint w, ECParameterSpec params) {
          if (w == null) {
              throw new NullPointerException("w is null");
          }
          if (params == null) {
              throw new NullPointerException("params is null");
          }
          if (w == ECPoint.POINT_INFINITY) {
              throw new IllegalArgumentException("w is ECPoint.POINT_INFINITY");
          }
          this.w = w;
          this.params = params;
      }
  
      /**
       * Returns the public point W.
       * @return the public point W.
       */
      public ECPoint getW() {
          return w;
      }
  
      /**
       * Returns the associated elliptic curve domain
       * parameters.
       * @return the EC domain parameters.
       */
      public ECParameterSpec getParams() {
          return params;
      }
  }
  