Edit C:\Program Files\Java\jdk1.8.0_121\java\security\cert\CertStoreSpi.java

/*
 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package java.security.cert;

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

/**
 * The Service Provider Interface (SPI)
 * 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.
 * 
 * Concurrent Access
 * 
 * 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.
 * 
 * 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.
 * 
 * For some {@code CertStore} types, the resulting
 * {@code Collection} may not contain all 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.
 * 
 * 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.
 * 
 * For some {@code CertStore} types, the resulting
 * {@code Collection} may not contain all 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.
 * 
 * Some {@code CertStore} implementations (especially LDAP
 * {@code CertStore}s) may throw a {@code CertStoreException}
 * unless a non-null {@code CRLSelector} is provided that includes
 * specific criteria that can be used to find the CRLs. Issuer names
 * and/or the certificate to be checked are especially useful.
 *
 * @param selector A {@code CRLSelector} used to select which
 * {@code CRL}s should be returned. Specify {@code null}
 * to return all {@code CRL}s (if supported).
 * @return A {@code Collection} of {@code CRL}s that
 * match the specified selector (never {@code null})
 * @throws CertStoreException if an exception occurs
 */
 public abstract Collection<? extends CRL> engineGetCRLs
 (CRLSelector selector) throws CertStoreException;
}

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