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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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.
 *
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package java.security.cert;

import java.security.InvalidAlgorithmParameterException;
import java.util.Collection;

/**
 * The <i>Service Provider Interface</i> (<b>SPI</b>)
 * for the {@link CertStore CertStore} class. All {@code CertStore}
 * implementations must include a class (the SPI class) that extends
 * this class ({@code CertStoreSpi}), provides a constructor with
 * a single argument of type {@code CertStoreParameters}, and implements
 * all of its methods. In general, instances of this class should only be
 * accessed through the {@code CertStore} class.
 * For details, see the Java Cryptography Architecture.
 * <p>
 * <b>Concurrent Access</b>
 * <p>
 * The public methods of all {@code CertStoreSpi} objects must be
 * thread-safe. That is, multiple threads may concurrently invoke these
 * methods on a single {@code CertStoreSpi} object (or more than one)
 * with no ill effects. This allows a {@code CertPathBuilder} to search
 * for a CRL while simultaneously searching for further certificates, for
 * instance.
 * <p>
 * Simple {@code CertStoreSpi} implementations will probably ensure
 * thread safety by adding a {@code synchronized} keyword to their
 * {@code engineGetCertificates} and {@code engineGetCRLs} methods.
 * More sophisticated ones may allow truly concurrent access.
 *
 * @since       1.4
 * @author      Steve Hanna
 */
public abstract class CertStoreSpi {

    /**
     * The sole constructor.
     *
     * @param params the initialization parameters (may be {@code null})
     * @throws InvalidAlgorithmParameterException if the initialization
     * parameters are inappropriate for this {@code CertStoreSpi}
     */
    public CertStoreSpi(CertStoreParameters params)
    throws InvalidAlgorithmParameterException { }

    /**
     * Returns a {@code Collection} of {@code Certificate}s that
     * match the specified selector. If no {@code Certificate}s
     * match the selector, an empty {@code Collection} will be returned.
     * <p>
     * For some {@code CertStore} types, the resulting
     * {@code Collection} may not contain <b>all</b> of the
     * {@code Certificate}s that match the selector. For instance,
     * an LDAP {@code CertStore} may not search all entries in the
     * directory. Instead, it may just search entries that are likely to
     * contain the {@code Certificate}s it is looking for.
     * <p>
     * Some {@code CertStore} implementations (especially LDAP
     * {@code CertStore}s) may throw a {@code CertStoreException}
     * unless a non-null {@code CertSelector} is provided that includes
     * specific criteria that can be used to find the certificates. Issuer
     * and/or subject names are especially useful criteria.
     *
     * @param selector A {@code CertSelector} used to select which
     *  {@code Certificate}s should be returned. Specify {@code null}
     *  to return all {@code Certificate}s (if supported).
     * @return A {@code Collection} of {@code Certificate}s that
     *         match the specified selector (never {@code null})
     * @throws CertStoreException if an exception occurs
     */
    public abstract Collection<? extends Certificate> engineGetCertificates
            (CertSelector selector) throws CertStoreException;

    /**
     * Returns a {@code Collection} of {@code CRL}s that
     * match the specified selector. If no {@code CRL}s
     * match the selector, an empty {@code Collection} will be returned.
     * <p>
     * For some {@code CertStore} types, the resulting
     * {@code Collection} may not contain <b>all</b> of the
     * {@code CRL}s that match the selector. For instance,
     * an LDAP {@code CertStore} may not search all entries in the
     * directory. Instead, it may just search entries that are likely to
     * contain the {@code CRL}s it is looking for.
     * <p>
     * Some {@code CertStore} implementations (especially LDAP
     * {@code CertStore}s) may throw a {@code CertStoreException}
     * unless a non-null {@code CRLSelector} is provided that includes

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