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## java.security.cert
Class CertStoreSpi

    java.lang.Object
      |
      +--java.security.cert.CertStoreSpi

Direct Known Subclasses:
  CertStoreCollectionSpi

public abstract class CertStoreSpi
extends java.lang.Object

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

Constructor Summary
`CertStoreSpi(CertStoreParameters params)` The sole constructor.

Method Summary
`abstract Collection` | `engineGetCertificates(CertSelector selector)` Returns a `Collection` of `Certificate`s that match the specified selector.
`abstract Collection` | `engineGetCRLs(CRLSelector selector)` Returns a `Collection` of `CRL`s that match the specified selector.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### CertStoreSpi

    public CertStoreSpi(CertStoreParameters params)
                 throws InvalidAlgorithmParameterException

  The sole constructor.

Parameters:
  `params` - the initialization parameters (may be `null`)
Throws:
  `InvalidAlgorithmParameterException` - if the initialization parameters are inappropriate for this `CertStoreSpi`

Method Detail

### engineGetCertificates

    public abstract Collection engineGetCertificates(CertSelector selector)
                                              throws CertStoreException

  Returns a `Collection` of `Certificate`s that match the specified selector. If no `Certificate`s match the selector, an empty `Collection` will be returned.
  For some `CertStore` types, the resulting `Collection` may not contain all of the `Certificate`s that match the selector. For instance, an LDAP `CertStore` may not search all entries in the directory. Instead, it may just search entries that are likely to contain the `Certificate`s it is looking for.
  Some `CertStore` implementations (especially LDAP `CertStore`s) may throw a `CertStoreException` unless a non-null `CertSelector` is provided that includes specific criteria that can be used to find the certificates. Issuer and/or subject names are especially useful criteria.

  Parameters:
    `selector` - A `CertSelector` used to select which `Certificate`s should be returned. Specify `null` to return all `Certificate`s (if supported).
  Returns:
    A `Collection` of `Certificate`s that match the specified selector (never `null`)
  Throws:
    `CertStoreException` - if an exception occurs

### engineGetCRLs

    public abstract Collection engineGetCRLs(CRLSelector selector)
                                      throws CertStoreException

  Returns a `Collection` of `CRL`s that match the specified selector. If no `CRL`s match the selector, an empty `Collection` will be returned.
  For some `CertStore` types, the resulting `Collection` may not contain all of the `CRL`s that match the selector. For instance, an LDAP `CertStore` may not search all entries in the directory. Instead, it may just search entries that are likely to contain the `CRL`s it is looking for.
  Some `CertStore` implementations (especially LDAP `CertStore`s) may throw a `CertStoreException` unless a non-null `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.

  Parameters:
    `selector` - A `CRLSelector` used to select which `CRL`s should be returned. Specify `null` to return all `CRL`s (if supported).
  Returns:
    A `Collection` of `CRL`s that match the specified selector (never `null`)
  Throws:
    `CertStoreException` - if an exception occurs

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