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package java.security.cert;

import java.security.InvalidAlgorithmParameterException;


The Service Provider Interface (SPI) for the CertPathBuilder class. All CertPathBuilder implementations must include a class (the SPI class) that extends this class (CertPathBuilderSpi) and implements all of its methods. In general, instances of this class should only be accessed through the CertPathBuilder class. For details, see the Java Cryptography Architecture. 

Concurrent Access

 Instances of this class need not be protected against concurrent access from multiple threads. Threads that need to access a single CertPathBuilderSpi instance concurrently should synchronize amongst themselves and provide the necessary locking before calling the wrapping CertPathBuilder object. 
 However, implementations of CertPathBuilderSpi may still encounter concurrency issues, since multiple threads each manipulating a different CertPathBuilderSpi instance need not synchronize. 
Author:     Sean Mullan
Since:      1.4
/**
 * The <i>Service Provider Interface</i> (<b>SPI</b>)
 * for the {@link CertPathBuilder CertPathBuilder} class. All
 * {@code CertPathBuilder} implementations must include a class (the
 * SPI class) that extends this class ({@code CertPathBuilderSpi}) and
 * implements all of its methods. In general, instances of this class should
 * only be accessed through the {@code CertPathBuilder} 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 CertPathBuilderSpi} instance concurrently should synchronize
 * amongst themselves and provide the necessary locking before calling the
 * wrapping {@code CertPathBuilder} object.
 * <p>
 * However, implementations of {@code CertPathBuilderSpi} may still
 * encounter concurrency issues, since multiple threads each
 * manipulating a different {@code CertPathBuilderSpi} instance need not
 * synchronize.
 *
 * @since       1.4
 * @author      Sean Mullan
 */
public abstract class CertPathBuilderSpi {

    
The default constructor.

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

    
Attempts to build a certification path using the specified
algorithm parameter set.

Params:
  • params – the algorithm parameters
Throws:
Returns:the result of the build algorithm
/**
     * Attempts to build a certification path using the specified
     * algorithm parameter set.
     *
     * @param params the algorithm parameters
     * @return the result of the build algorithm
     * @throws CertPathBuilderException if the builder is unable to construct
     * a certification path that satisfies the specified parameters
     * @throws InvalidAlgorithmParameterException if the specified parameters
     * are inappropriate for this {@code CertPathBuilder}
     */
    public abstract CertPathBuilderResult engineBuild(CertPathParameters params)
        throws CertPathBuilderException, InvalidAlgorithmParameterException;

    
Returns a CertPathChecker that this implementation uses to check the revocation status of certificates. A PKIX implementation returns objects of type PKIXRevocationChecker. 
The primary purpose of this method is to allow callers to specify additional input parameters and options specific to revocation checking. See the class description of CertPathBuilder for an example. 
This method was added to version 1.8 of the Java Platform Standard Edition. In order to maintain backwards compatibility with existing service providers, this method cannot be abstract and by default throws an UnsupportedOperationException. 
Throws:
Returns:a CertPathChecker that this implementation uses to check the revocation status of certificates
Since:1.8
/**
     * Returns a {@code CertPathChecker} that this implementation uses to
     * check the revocation status of certificates. A PKIX implementation
     * returns objects of type {@code PKIXRevocationChecker}.
     *
     * <p>The primary purpose of this method is to allow callers to specify
     * additional input parameters and options specific to revocation checking.
     * See the class description of {@code CertPathBuilder} for an example.
     *
     * <p>This method was added to version 1.8 of the Java Platform Standard
     * Edition. In order to maintain backwards compatibility with existing
     * service providers, this method cannot be abstract and by default throws
     * an {@code UnsupportedOperationException}.
     *
     * @return a {@code CertPathChecker} that this implementation uses to
     * check the revocation status of certificates
     * @throws UnsupportedOperationException if this method is not supported
     * @since 1.8
     */
    public CertPathChecker engineGetRevocationChecker() {
        throw new UnsupportedOperationException();
    }
}