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com.lowagie.bc.asn1
Class ASN1Sequence  

java.lang.Object
  com.lowagie.bc.asn1.DERObject
      com.lowagie.bc.asn1.ASN1Sequence

All Implemented Interfaces:

DEREncodable, DERTags

Direct Known Subclasses:

DERConstructedSequence, DERSequence

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public abstract class ASN1Sequence

extends DERObject

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Field Summary
private  java.util.Vector	seq

 

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

ASN1Sequence()

 

Method Summary
protected  void	addObject(DEREncodable obj)
(package private) abstract  void	encode(DEROutputStream out)
boolean	equals(java.lang.Object o)           Determine whether this Object is semantically equal to another Object.
static ASN1Sequence	getInstance(ASN1TaggedObject obj, boolean explicit)           Return an ASN1 sequence from a tagged object.
static ASN1Sequence	getInstance(java.lang.Object obj)           return an ASN1Sequence from the given object.
DEREncodable	getObjectAt(int index)           return the object at the sequence postion indicated by index.
java.util.Enumeration	getObjects()
int	hashCode()           Get a value that represents this Object, as uniquely as possible within the confines of an int.
int	size()           return the number of objects in this sequence.

 

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

seq

private java.util.Vector seq

Constructor Detail

ASN1Sequence

public ASN1Sequence()

Method Detail

getInstance

public static ASN1Sequence getInstance(java.lang.Object obj)

return an ASN1Sequence from the given object.

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getInstance

public static ASN1Sequence getInstance(ASN1TaggedObject obj,
                                       boolean explicit)

Return an ASN1 sequence from a tagged object. There is a special case here, if an object appears to have been explicitly tagged on reading but we were expecting it to be implictly tagged in the normal course of events it indicates that we lost the surrounding sequence - so we need to add it back (this will happen if the tagged object is a sequence that contains other sequences). If you are dealing with implicitly tagged sequences you really should be using this method.

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getObjects

public java.util.Enumeration getObjects()

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getObjectAt

public DEREncodable getObjectAt(int index)

return the object at the sequence postion indicated by index.

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size

public int size()

return the number of objects in this sequence.

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hashCode

public int hashCode()

Description copied from class: java.lang.Object

Get a value that represents this Object, as uniquely as possible within the confines of an int.

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

• Semantic equality implies identical hashcodes. In other words, if a.equals(b) is true, then a.hashCode() == b.hashCode() must be as well. However, the reverse is not necessarily true, and two objects may have the same hashcode without being equal.
• It must be consistent. Whichever value o.hashCode() returns on the first invocation must be the value returned on all later invocations as long as the object exists. Notice, however, that the result of hashCode may change between separate executions of a Virtual Machine, because it is not invoked on the same object.

Notice that since hashCode is used in java.util.Hashtable and other hashing classes, a poor implementation will degrade the performance of hashing (so don't blindly implement it as returning a constant!). Also, if calculating the hash is time-consuming, a class may consider caching the results.

The default implementation returns System.identityHashCode(this)

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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.

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addObject

protected void addObject(DEREncodable obj)

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encode

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

Specified by:

encode in class DERObject

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> com >> lowagie >> bc >> [ asn1 overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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