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package com.lowagie.bc.asn1;
import java.io.IOException;
/**
* ASN.1 TaggedObject - in ASN.1 nottation this is any object proceeded by
* a [n] where n is some number - these are assume to follow the construction
* rules (as with sequences).
*/
public abstract class ASN1TaggedObject
extends DERObject
{
int tagNo;
boolean empty = false;
boolean explicit = true;
DEREncodable obj = null;
static public ASN1TaggedObject getInstance(
ASN1TaggedObject obj,
boolean explicit)
{
if (explicit)
{
return (ASN1TaggedObject)obj.getObject();
}
throw new IllegalArgumentException("implicitly tagged tagged object");
}
/**
* @param tagNo the tag number for this object.
* @param obj the tagged object.
*/
public ASN1TaggedObject(
int tagNo,
DEREncodable obj)
{
this.explicit = true;
this.tagNo = tagNo;
this.obj = obj;
}
/**
* @param explicit true if the object is explicitly tagged.
* @param tagNo the tag number for this object.
* @param obj the tagged object.
*/
public ASN1TaggedObject(
boolean explicit,
int tagNo,
DEREncodable obj)
{
this.explicit = explicit;
this.tagNo = tagNo;
this.obj = obj;
}
public boolean equals(
Object o)
{
if (o == null || !(o instanceof ASN1TaggedObject))
{
return false;
}
ASN1TaggedObject other = (ASN1TaggedObject)o;
if (tagNo != other.tagNo || empty != other.empty || explicit != other.explicit)
{
return false;
}
if(obj == null)
{
if(other.obj != null)
{
return false;
}
}
else
{
if(!(obj.equals(other.obj)))
{
return false;
}
}
return true;
}
public int hashCode()
{
int code = tagNo;
if (obj != null)
{
code ^= obj.hashCode();
}
return code;
}
public int getTagNo()
{
return tagNo;
}
/**
* return whether or not the object may be explicitly tagged.
* <p>
* Note: if the object has been read from an input stream, the only
* time you can be sure if isExplicit is returning the true state of
* affairs is if it returns false. An implicitly tagged object may appear
* to be explicitly tagged, so you need to understand the context under
* which the reading was done as well, see getObject below.
*/
public boolean isExplicit()
{
return explicit;
}
public boolean isEmpty()
{
return empty;
}
/**
* return whatever was following the tag.
* <p>
* Note: tagged objects are generally context dependent if you're
* trying to extract a tagged object you should be going via the
* appropriate getInstance method.
*/
public DERObject getObject()
{
if (obj != null)
{
return obj.getDERObject();
}
return null;
}
abstract void encode(DEROutputStream out)
throws IOException;
}
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