java.security.cert

## Class CertPathBuilder

- java.lang.Object
- - java.security.cert.CertPathBuilder

-     public class CertPathBuilder
      extends Object

  A class for building certification paths (also known as certificate chains).

  This class uses a provider-based architecture. To create a `CertPathBuilder`, call one of the static `getInstance` methods, passing in the algorithm name of the `CertPathBuilder` desired and optionally the name of the provider desired.

  Once a `CertPathBuilder` object has been created, certification paths can be constructed by calling the `build` method and passing it an algorithm-specific set of parameters. If successful, the result (including the `CertPath` that was built) is returned in an object that implements the `CertPathBuilderResult` interface.

  Every implementation of the Java platform is required to support the following standard `CertPathBuilder` algorithm:

  - `PKIX`
  This algorithm is described in the CertPathBuilder section of the Java Cryptography Architecture Standard Algorithm Name Documentation. Consult the release documentation for your implementation to see if any other algorithms are supported.

  Concurrent Access

  The static methods of this class are guaranteed to be thread-safe. Multiple threads may concurrently invoke the static methods defined in this class with no ill effects.

  However, this is not true for the non-static methods defined by this class. Unless otherwise documented by a specific provider, threads that need to access a single `CertPathBuilder` instance concurrently should synchronize amongst themselves and provide the necessary locking. Multiple threads each manipulating a different `CertPathBuilder` instance need not synchronize.

  Since:
    1.4
  See Also:
    `CertPath`

- - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `CertPathBuilder(CertPathBuilderSpi builderSpi, Provider provider, String algorithm)` Creates a `CertPathBuilder` object of the given algorithm, and encapsulates the given provider implementation (SPI object) in it.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `CertPathBuilderResult` | `build(CertPathParameters params)` Attempts to build a certification path using the specified algorithm parameter set.
    `String` | `getAlgorithm()` Returns the name of the algorithm of this `CertPathBuilder`.
    `static String` | `getDefaultType()` Returns the default `CertPathBuilder` type as specified in the Java security properties file, or the string "PKIX" if no such property exists.
    `static CertPathBuilder` | `getInstance(String algorithm)` Returns a `CertPathBuilder` object that implements the specified algorithm.
    `static CertPathBuilder` | `getInstance(String algorithm, Provider provider)` Returns a `CertPathBuilder` object that implements the specified algorithm.
    `static CertPathBuilder` | `getInstance(String algorithm, String provider)` Returns a `CertPathBuilder` object that implements the specified algorithm.
    `Provider` | `getProvider()` Returns the provider of this `CertPathBuilder`.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### CertPathBuilder

          protected CertPathBuilder(CertPathBuilderSpi builderSpi,
                         Provider provider,
                         String algorithm)

      Creates a `CertPathBuilder` object of the given algorithm, and encapsulates the given provider implementation (SPI object) in it.
      Parameters:
        `builderSpi` - the provider implementation
        `provider` - the provider
        `algorithm` - the algorithm name

  - ### Method Detail

    - #### getInstance

          public static CertPathBuilder getInstance(String algorithm)
                                             throws NoSuchAlgorithmException

      Returns a `CertPathBuilder` object that implements the specified algorithm.

      This method traverses the list of registered security Providers, starting with the most preferred Provider. A new CertPathBuilder object encapsulating the CertPathBuilderSpi implementation from the first Provider that supports the specified algorithm is returned.

      Note that the list of registered providers may be retrieved via the `Security.getProviders()` method.

      Parameters:
        `algorithm` - the name of the requested `CertPathBuilder` algorithm. See the CertPathBuilder section in the Java Cryptography Architecture Standard Algorithm Name Documentation for information about standard algorithm names.
      Returns:
        a `CertPathBuilder` object that implements the specified algorithm.
      Throws:
        `NoSuchAlgorithmException` - if no Provider supports a CertPathBuilderSpi implementation for the specified algorithm.
      See Also:
        `Provider`

    - #### getInstance

          public static CertPathBuilder getInstance(String algorithm,
                                    String provider)
                                             throws NoSuchAlgorithmException,
                                                    NoSuchProviderException

      Returns a `CertPathBuilder` object that implements the specified algorithm.

      A new CertPathBuilder object encapsulating the CertPathBuilderSpi implementation from the specified provider is returned. The specified provider must be registered in the security provider list.

      Note that the list of registered providers may be retrieved via the `Security.getProviders()` method.

      Parameters:
        `algorithm` - the name of the requested `CertPathBuilder` algorithm. See the CertPathBuilder section in the Java Cryptography Architecture Standard Algorithm Name Documentation for information about standard algorithm names.
        `provider` - the name of the provider.
      Returns:
        a `CertPathBuilder` object that implements the specified algorithm.
      Throws:
        `NoSuchAlgorithmException` - if a CertPathBuilderSpi implementation for the specified algorithm is not available from the specified provider.
        `NoSuchProviderException` - if the specified provider is not registered in the security provider list.
        `IllegalArgumentException` - if the `provider` is null or empty.
      See Also:
        `Provider`

    - #### getInstance

          public static CertPathBuilder getInstance(String algorithm,
                                    Provider provider)
                                             throws NoSuchAlgorithmException

      Returns a `CertPathBuilder` object that implements the specified algorithm.

      A new CertPathBuilder object encapsulating the CertPathBuilderSpi implementation from the specified Provider object is returned. Note that the specified Provider object does not have to be registered in the provider list.

      Parameters:
        `algorithm` - the name of the requested `CertPathBuilder` algorithm. See the CertPathBuilder section in the Java Cryptography Architecture Standard Algorithm Name Documentation for information about standard algorithm names.
        `provider` - the provider.
      Returns:
        a `CertPathBuilder` object that implements the specified algorithm.
      Throws:
        `NoSuchAlgorithmException` - if a CertPathBuilderSpi implementation for the specified algorithm is not available from the specified Provider object.
        `IllegalArgumentException` - if the `provider` is null.
      See Also:
        `Provider`

    - #### getProvider

          public final Provider getProvider()

      Returns the provider of this `CertPathBuilder`.
      Returns:
        the provider of this `CertPathBuilder`

    - #### getAlgorithm

          public final String getAlgorithm()

      Returns the name of the algorithm of this `CertPathBuilder`.
      Returns:
        the name of the algorithm of this `CertPathBuilder`

    - #### build

          public final CertPathBuilderResult build(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`

    - #### getDefaultType

          public static final String getDefaultType()

      Returns the default `CertPathBuilder` type as specified in the Java security properties file, or the string "PKIX" if no such property exists. The Java security properties file is located in the file named <JAVA_HOME>/lib/security/java.security. <JAVA_HOME> refers to the value of the java.home system property, and specifies the directory where the JRE is installed.

      The default `CertPathBuilder` type can be used by applications that do not want to use a hard-coded type when calling one of the `getInstance` methods, and want to provide a default type in case a user does not specify its own.

      The default `CertPathBuilder` type can be changed by setting the value of the "certpathbuilder.type" security property (in the Java security properties file) to the desired type.

      Returns:
        the default `CertPathBuilder` type as specified in the Java security properties file, or the string "PKIX" if no such property exists.

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