/*

 * Copyright 2000-2001 Sun Microsystems, Inc.  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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package java.security.cert;

import java.security.InvalidAlgorithmParameterException;

/**

 * The <i>Service Provider Interface</i> (<b>SPI</b>)

 * for the {@link CertPathBuilder CertPathBuilder} class. All

 * <code>CertPathBuilder</code> implementations must include a class (the

 * SPI class) that extends this class (<code>CertPathBuilderSpi</code>) and

 * implements all of its methods. In general, instances of this class should

 * only be accessed through the <code>CertPathBuilder</code> class. For

 * details, see the Java Cryptography Architecture.

 * <p>

 * <b>Concurrent Access</b>

 * <p>

 * Instances of this class need not be protected against concurrent

 * access from multiple threads. Threads that need to access a single

 * <code>CertPathBuilderSpi</code> instance concurrently should synchronize

 * amongst themselves and provide the necessary locking before calling the

 * wrapping <code>CertPathBuilder</code> object.

 * <p>

 * However, implementations of <code>CertPathBuilderSpi</code> may still

 * encounter concurrency issues, since multiple threads each

 * manipulating a different <code>CertPathBuilderSpi</code> instance need not

 * synchronize.

 *

 * @since       1.4

 * @author      Sean Mullan

 */

public abstract class CertPathBuilderSpi {

    /**

     * The default constructor.

     */

    public CertPathBuilderSpi() { }

    /**

     * Attempts to build a certification path using the specified

     * algorithm parameter set.

     *

     * @param params the algorithm parameters

     * @return the result of the build algorithm

     * @throws CertPathBuilderException if the builder is unable to construct

     * a certification path that satisfies the specified parameters

     * @throws InvalidAlgorithmParameterException if the specified parameters

     * are inappropriate for this <code>CertPathBuilder</code>

     */

    public abstract CertPathBuilderResult engineBuild(CertPathParameters params)

        throws CertPathBuilderException, InvalidAlgorithmParameterException;

}