PolicyQualifierInfo (Java 2 Platform SE v1.4.1) - JDK 5 Documentation v1.4.1, Java 2 SDK 英文文档

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Java^TM 2 Platform
Std. Ed. v1.4.1

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java.security.cert
Class PolicyQualifierInfo

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

public final class PolicyQualifierInfo
extends Object

An immutable policy qualifier represented by the ASN.1 PolicyQualifierInfo structure.

The ASN.1 definition is as follows:

   PolicyQualifierInfo ::= SEQUENCE {
        policyQualifierId       PolicyQualifierId,
        qualifier               ANY DEFINED BY policyQualifierId }

A certificate policies extension, if present in an X.509 version 3 certificate, contains a sequence of one or more policy information terms, each of which consists of an object identifier (OID) and optional qualifiers. In an end-entity certificate, these policy information terms indicate the policy under which the certificate has been issued and the purposes for which the certificate may be used. In a CA certificate, these policy information terms limit the set of policies for certification paths which include this certificate.

A Set of PolicyQualifierInfo objects are returned by the PolicyNode.getPolicyQualifiers method. This allows applications with specific policy requirements to process and validate each policy qualifier. Applications that need to process policy qualifiers should explicitly set the policyQualifiersRejected flag to false (by calling the PKIXParameters.setPolicyQualifiersRejected method) before validating a certification path.

Note that the PKIX certification path validation algorithm specifies that any policy qualifier in a certificate policies extension that is marked critical must be processed and validated. Otherwise the certification path must be rejected. If the policyQualifiersRejected flag is set to false, it is up to the application to validate all policy qualifiers in this manner in order to be PKIX compliant.

Concurrent Access

All PolicyQualifierInfo objects must be immutable and thread-safe. That is, multiple threads may concurrently invoke the methods defined in this class on a single PolicyQualifierInfo object (or more than one) with no ill effects. Requiring PolicyQualifierInfo objects to be immutable and thread-safe allows them to be passed around to various pieces of code without worrying about coordinating access.

Since:: 1.4

Constructor Summary

PolicyQualifierInfo(byte[] encoded)
          Creates an instance of PolicyQualifierInfo from the encoded bytes.

Method Summary

byte[] getEncoded()
          Returns the ASN.1 DER encoded form of this PolicyQualifierInfo.

byte[] getPolicyQualifier()
          Returns the ASN.1 DER encoded form of the qualifier field of this PolicyQualifierInfo.

String getPolicyQualifierId()
          Returns the policyQualifierId field of this PolicyQualifierInfo.

String toString()
          Return a printable representation of this PolicyQualifierInfo.

Methods inherited from class java.lang.Object

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

Constructor Detail

PolicyQualifierInfo

public PolicyQualifierInfo(byte[] encoded)
                    throws IOException

Creates an instance of PolicyQualifierInfo from the encoded bytes. The encoded byte array is copied on construction.
Parameters:: encoded - a byte array containing the qualifier in DER encoding
Throws:: IOException - thrown if the byte array does not represent a valid and parsable policy qualifier

Method Detail

getPolicyQualifierId

public String getPolicyQualifierId()

Returns the policyQualifierId field of this PolicyQualifierInfo. The policyQualifierId is an Object Identifier (OID) represented by a set of nonnegative integers separated by periods.

Returns:: the OID (never null)

getEncoded

public byte[] getEncoded()

Returns the ASN.1 DER encoded form of this PolicyQualifierInfo.

Returns:: the ASN.1 DER encoded bytes (never null). Note that a copy is returned, so the data is cloned each time this method is called.

getPolicyQualifier

public byte[] getPolicyQualifier()

Returns the ASN.1 DER encoded form of the qualifier field of this PolicyQualifierInfo.

Returns:: the ASN.1 DER encoded bytes of the qualifier field. Note that a copy is returned, so the data is cloned each time this method is called.

toString

public String toString()

Return a printable representation of this PolicyQualifierInfo.

Overrides:: toString in class Object

Returns:: a String describing the contents of this PolicyQualifierInfo