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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
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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 CertPathValidator CertPathValidator} class. All
 * {@code CertPathValidator} implementations must include a class (the
 * SPI class) that extends this class ({@code CertPathValidatorSpi})
 * and implements all of its methods. In general, instances of this class
 * should only be accessed through the {@code CertPathValidator} 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 CertPathValidatorSpi} instance concurrently should synchronize
 * amongst themselves and provide the necessary locking before calling the
 * wrapping {@code CertPathValidator} object.
 * <p>
 * However, implementations of {@code CertPathValidatorSpi} may still
 * encounter concurrency issues, since multiple threads each
 * manipulating a different {@code CertPathValidatorSpi} instance need not
 * synchronize.
 *
 * @since       1.4
 * @author      Yassir Elley
 */
public abstract class CertPathValidatorSpi {

    /**
     * The default constructor.
     */
    public CertPathValidatorSpi() {}

    /**
     * Validates the specified certification path using the specified
     * algorithm parameter set.
     * <p>
     * The {@code CertPath} specified must be of a type that is
     * supported by the validation algorithm, otherwise an
     * {@code InvalidAlgorithmParameterException} will be thrown. For
     * example, a {@code CertPathValidator} that implements the PKIX
     * algorithm validates {@code CertPath} objects of type X.509.
     *
     * @param certPath the {@code CertPath} to be validated
     * @param params the algorithm parameters
     * @return the result of the validation algorithm
     * @exception CertPathValidatorException if the {@code CertPath}
     * does not validate
     * @exception InvalidAlgorithmParameterException if the specified
     * parameters or the type of the specified {@code CertPath} are
     * inappropriate for this {@code CertPathValidator}
     */
    public abstract CertPathValidatorResult
        engineValidate(CertPath certPath, CertPathParameters params)
        throws CertPathValidatorException, InvalidAlgorithmParameterException;
}
