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## org.bouncycastle.asn1
Class ASN1ObjectIdentifier

    java.lang.Object
      org.bouncycastle.asn1.ASN1Object
          org.bouncycastle.asn1.ASN1Primitive
              org.bouncycastle.asn1.ASN1ObjectIdentifier

All Implemented Interfaces:
  ASN1Encodable, Encodable

Direct Known Subclasses:
  PolicyQualifierId

public class ASN1ObjectIdentifier
extends ASN1Primitive

Class representing the ASN.1 OBJECT IDENTIFIER type.

Constructor Summary
`ASN1ObjectIdentifier(java.lang.String identifier)` Create an OID based on the passed in String.

Method Summary
`ASN1ObjectIdentifier` | `branch(java.lang.String branchID)` Return an OID that creates a branch under the current one.
`static ASN1ObjectIdentifier` | `fromContents(byte[] contents)`
`java.lang.String` | `getId()` Return the OID as a string.
`static ASN1ObjectIdentifier` | `getInstance(ASN1TaggedObject taggedObject, boolean declaredExplicit)` Return an OBJECT IDENTIFIER from a tagged object.
`static ASN1ObjectIdentifier` | `getInstance(java.lang.Object obj)` Return an OID from the passed in object
`static ASN1ObjectIdentifier` | `getTagged(ASN1TaggedObject taggedObject, boolean declaredExplicit)`
`int` | `hashCode()`
`ASN1ObjectIdentifier` | `intern()` Intern will return a reference to a pooled version of this object, unless it is not present in which case intern will add it.
`boolean` | `on(ASN1ObjectIdentifier stem)` Return true if this oid is an extension of the passed in branch - stem.
`java.lang.String` | `toString()`
`static ASN1ObjectIdentifier` | `tryFromID(java.lang.String identifier)`

Methods inherited from class org.bouncycastle.asn1.ASN1Primitive
`encodeTo, encodeTo, equals, equals, equals, fromByteArray, toASN1Primitive`

Methods inherited from class org.bouncycastle.asn1.ASN1Object
`getEncoded, getEncoded, hasEncodedTagValue`

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

Constructor Detail

### ASN1ObjectIdentifier

    public ASN1ObjectIdentifier(java.lang.String identifier)

  Create an OID based on the passed in String.

Parameters:
  `identifier` - a string representation of an OID.

Method Detail

### fromContents

    public static ASN1ObjectIdentifier fromContents(byte[] contents)

### getInstance

    public static ASN1ObjectIdentifier getInstance(java.lang.Object obj)

  Return an OID from the passed in object

  Parameters:
    `obj` - an ASN1ObjectIdentifier or an object that can be converted into one.
  Returns:
    an ASN1ObjectIdentifier instance, or null.
  Throws:
    `java.lang.IllegalArgumentException` - if the object cannot be converted.

### getInstance

    public static ASN1ObjectIdentifier getInstance(ASN1TaggedObject taggedObject,
                                                   boolean declaredExplicit)

  Return an OBJECT IDENTIFIER from a tagged object.

  Parameters:
    `taggedObject` - the tagged object holding the object we want
    `declaredExplicit` - true if the object is meant to be explicitly tagged false otherwise.
  Returns:
    an ASN1ObjectIdentifier instance, or null.
  Throws:
    `java.lang.IllegalArgumentException` - if the tagged object cannot be converted.

### getTagged

    public static ASN1ObjectIdentifier getTagged(ASN1TaggedObject taggedObject,
                                                 boolean declaredExplicit)

### tryFromID

    public static ASN1ObjectIdentifier tryFromID(java.lang.String identifier)

### branch

    public ASN1ObjectIdentifier branch(java.lang.String branchID)

  Return an OID that creates a branch under the current one.

  Parameters:
    `branchID` - node numbers for the new branch.
  Returns:
    the OID for the new created branch.

### getId

    public java.lang.String getId()

  Return the OID as a string.

  Returns:
    the string representation of the OID carried by this object.

### on

    public boolean on(ASN1ObjectIdentifier stem)

  Return true if this oid is an extension of the passed in branch - stem.

  Parameters:
    `stem` - the arc or branch that is a possible parent.
  Returns:
    true if the branch is on the passed in stem, false otherwise.

### hashCode

    public int hashCode()

  Specified by:
    `hashCode` in class `ASN1Primitive`

### toString

    public java.lang.String toString()

### intern

    public ASN1ObjectIdentifier intern()

  Intern will return a reference to a pooled version of this object, unless it is not present in which case intern will add it.

  The pool is also used by the ASN.1 parsers to limit the number of duplicated OID objects in circulation.

  Returns:
    a reference to the identifier in the pool.

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