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package org.bouncycastle.jce.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</code>
* implementations must include a class (the SPI class) that extends
* this class (<code>CertStoreSpi</code>), provides a constructor with
* a single argument of type <code>CertStoreParameters</code>, and implements
* all of its methods. In general, instances of this class should only be
* accessed through the <code>CertStore</code> class.
* For details, see the Java Cryptography Architecture.<br />
* <br />
* <b>Concurrent Access</b><br />
* <br />
* The public methods of all <code>CertStoreSpi</code> objects must be
* thread-safe. That is, multiple threads may concurrently invoke these
* methods on a single <code>CertStoreSpi</code> object (or more than one)
* with no ill effects. This allows a <code>CertPathBuilder</code> to search
* for a CRL while simultaneously searching for further certificates, for
* instance.<br />
* <br />
* Simple <code>CertStoreSpi</code> implementations will probably ensure
* thread safety by adding a <code>synchronized</code> keyword to their
* <code>engineGetCertificates</code> and <code>engineGetCRLs</code> methods.
* More sophisticated ones may allow truly concurrent access.
**/
public abstract class CertStoreSpi
extends Object
{
/**
* The sole constructor.
*
* @param params the initialization parameters (may be <code>null</code>)
* @exception InvalidAlgorithmParameterException if the initialization
* parameters are inappropriate for this <code>CertStoreSpi</code>
*/
public CertStoreSpi(CertStoreParameters params)
throws InvalidAlgorithmParameterException {}
/**
* Returns a <code>Collection</code> of <code>Certificate</code>s that
* match the specified selector. If no <code>Certificate</code>s
* match the selector, an empty <code>Collection</code> will be returned.<br />
* <br />
* For some <code>CertStore</code> types, the resulting
* <code>Collection</code> may not contain <b>all</b> of the
* <code>Certificate</code>s that match the selector. For instance,
* an LDAP <code>CertStore</code> may not search all entries in the
* directory. Instead, it may just search entries that are likely to
* contain the <code>Certificate</code>s it is looking for.<br />
* <br />
* Some <code>CertStore</code> implementations (especially LDAP
* <code>CertStore</code>s) may throw a <code>CertStoreException</code>
* unless a non-null <code>CertSelector</code> 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</code> used to select which
* <code>Certificate</code>s should be returned. Specify <code>null</code>
* to return all <code>Certificate</code>s (if supported).
*
* @return A <code>Collection</code> of <code>Certificate</code>s that
* match the specified selector (never <code>null</code>)
*
* @exception CertStoreException if an exception occurs
*/
public abstract Collection engineGetCertificates(CertSelector selector)
throws CertStoreException;
/**
* Returns a <code>Collection</code> of <code>CRL</code>s that
* match the specified selector. If no <code>CRL</code>s
* match the selector, an empty <code>Collection</code> will be returned.<br />
* <br />
* For some <code>CertStore</code> types, the resulting
* <code>Collection</code> may not contain <b>all</b> of the
* <code>CRL</code>s that match the selector. For instance,
* an LDAP <code>CertStore</code> may not search all entries in the
* directory. Instead, it may just search entries that are likely to
* contain the <code>CRL</code>s it is looking for. <br />
* <br />
* Some <code>CertStore</code> implementations (especially LDAP
* <code>CertStore</code>s) may throw a <code>CertStoreException</code>
* unless a non-null <code>CRLSelector</code> 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</code> used to select which
* <code>CRL</code>s should be returned. Specify <code>null</code>
* to return all <code>CRL</code>s (if supported).
*
* @return A <code>Collection</code> of <code>CRL</code>s that
* match the specified selector (never <code>null</code>)
*
* @exception CertStoreException if an exception occurs
*/
public abstract Collection engineGetCRLs(CRLSelector selector)
throws CertStoreException;
}
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