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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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).
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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} implementations must include a class (the
 * SPI class) that extends this class ({@code CertPathBuilderSpi}) and
 * implements all of its methods. In general, instances of this class should
 * only be accessed through the {@code CertPathBuilder} 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} instance concurrently should synchronize
 * amongst themselves and provide the necessary locking before calling the
 * wrapping {@code CertPathBuilder} object.
 * <p>
 * However, implementations of {@code CertPathBuilderSpi} may still
 * encounter concurrency issues, since multiple threads each
 * manipulating a different {@code CertPathBuilderSpi} 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}
     */
    public abstract CertPathBuilderResult engineBuild(CertPathParameters params)
        throws CertPathBuilderException, InvalidAlgorithmParameterException;

    /**
     * Returns a {@code CertPathChecker} that this implementation uses to
     * check the revocation status of certificates. A PKIX implementation
     * returns objects of type {@code PKIXRevocationChecker}.
     *
     * <p>The primary purpose of this method is to allow callers to specify
     * additional input parameters and options specific to revocation checking.
     * See the class description of {@code CertPathBuilder} for an example.
     *
     * <p>This method was added to version 1.8 of the Java Platform Standard
     * Edition. In order to maintain backwards compatibility with existing
     * service providers, this method cannot be abstract and by default throws
     * an {@code UnsupportedOperationException}.
     *
     * @throws UnsupportedOperationException if this method is not supported
     * @since 1.8
     */
    public CertPathChecker engineGetRevocationChecker() {
        throw new UnsupportedOperationException();
    }
}