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## java.security.cert
Class CertPathBuilderSpi

    java.lang.Object
      java.security.cert.CertPathBuilderSpi

public abstract class CertPathBuilderSpi
extends Object

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.

Since:
  1.4

Constructor Summary
`CertPathBuilderSpi()` The default constructor.

Method Summary
`abstract CertPathBuilderResult` | `engineBuild(CertPathParameters params)` Attempts to build a certification path using the specified algorithm parameter set.

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

Constructor Detail

### CertPathBuilderSpi

    public CertPathBuilderSpi()

  The default constructor.

Method Detail

### engineBuild

    public abstract CertPathBuilderResult engineBuild(CertPathParameters params)
                                               throws CertPathBuilderException,
                                                      InvalidAlgorithmParameterException

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

  Parameters:
    `params` - the algorithm parameters
  Returns:
    the result of the build algorithm
  Throws:
    `CertPathBuilderException` - if the builder is unable to construct a certification path that satisfies the specified parameters
    `InvalidAlgorithmParameterException` - if the specified parameters are inappropriate for this `CertPathBuilder`

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2003 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.