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com.lowagie.bc.asn1
Class DERNull  

java.lang.Object
  com.lowagie.bc.asn1.DERObject
      com.lowagie.bc.asn1.ASN1Null
          com.lowagie.bc.asn1.DERNull

All Implemented Interfaces:

DEREncodable, DERTags

Direct Known Subclasses:

BERNull

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public class DERNull

extends ASN1Null

A NULL object.

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Field Summary
(package private)  byte[]	zeroBytes

 

Fields inherited from interface com.lowagie.bc.asn1.DERTags

APPLICATION, BIT_STRING, BMP_STRING, BOOLEAN, CONSTRUCTED, ENUMERATED, EXTERNAL, GENERAL_STRING, GENERALIZED_TIME, GRAPHIC_STRING, IA5_STRING, INTEGER, NULL, NUMERIC_STRING, OBJECT_IDENTIFIER, OCTET_STRING, PRINTABLE_STRING, SEQUENCE, SEQUENCE_OF, SET, SET_OF, T61_STRING, TAGGED, UNIVERSAL_STRING, UTC_TIME, UTF8_STRING, VIDEOTEX_STRING, VISIBLE_STRING

 

Constructor Summary

DERNull()

 

Method Summary
(package private)  void	encode(DEROutputStream out)
boolean	equals(java.lang.Object o)           Determine whether this Object is semantically equal to another Object.

 

Methods inherited from class com.lowagie.bc.asn1.ASN1Null

hashCode

 

Methods inherited from class com.lowagie.bc.asn1.DERObject

getDERObject

 

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

zeroBytes

byte[] zeroBytes

Constructor Detail

DERNull

public DERNull()

Method Detail

encode

void encode(DEROutputStream out)
      throws java.io.IOException

Specified by:

encode in class ASN1Null

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equals

public boolean equals(java.lang.Object o)

Description copied from class: java.lang.Object

Determine whether this Object is semantically equal to another Object.

There are some fairly strict requirements on this method which subclasses must follow:

• It must be transitive. If a.equals(b) and b.equals(c), then a.equals(c) must be true as well.
• It must be symmetric. a.equals(b) and b.equals(a) must have the same value.
• It must be reflexive. a.equals(a) must always be true.
• It must be consistent. Whichever value a.equals(b) returns on the first invocation must be the value returned on all later invocations.
• a.equals(null) must be false.
• It must be consistent with hashCode(). That is, a.equals(b) must imply a.hashCode() == b.hashCode(). The reverse is not true; two objects that are not equal may have the same hashcode, but that has the potential to harm hashing performance.

This is typically overridden to throw a java.lang.ClassCastException if the argument is not comparable to the class performing the comparison, but that is not a requirement. It is legal for a.equals(b) to be true even though a.getClass() != b.getClass(). Also, it is typical to never cause a java.lang.NullPointerException.

In general, the Collections API (java.util) use the equals method rather than the == operator to compare objects. However, java.util.IdentityHashMap is an exception to this rule, for its own good reasons.

The default implementation returns this == o.

Overrides:

equals in class ASN1Null

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