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Summary: Ctors | Methods | Inherited Methods

# CertPathBuilderSpi

`public abstract class CertPathBuilderSpi`
`extends Object` ``

java.lang.Object
↳ | java.security.cert.CertPathBuilderSpi

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.

## Summary

### Public constructors
`CertPathBuilderSpi()` The default constructor.

### Public methods
`abstract CertPathBuilderResult` | `engineBuild(CertPathParameters params)` Attempts to build a certification path using the specified algorithm parameter set.
`CertPathChecker` | `engineGetRevocationChecker()` Returns a `CertPathChecker` that this implementation uses to check the revocation status of certificates.

### Inherited methods
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

## Public constructors

### CertPathBuilderSpi

    public CertPathBuilderSpi ()

The default constructor.

## Public methods

### engineBuild

    public abstract CertPathBuilderResult engineBuild (CertPathParameters params)

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

Parameters
`params` | `CertPathParameters`: the algorithm parameters

Returns
`CertPathBuilderResult` | 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`

### engineGetRevocationChecker

    public CertPathChecker engineGetRevocationChecker ()

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`.

Returns
`CertPathChecker` | a `CertPathChecker` that this implementation uses to check the revocation status of certificates

Throws
`UnsupportedOperationException` | if this method is not supported

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