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package com.lowagie.bc.asn1;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Vector;
public abstract class ASN1Sequence
extends DERObject
{
private Vector seq = new Vector();
/**
* return an ASN1Sequence from the given object.
*
* @param obj the object we want converted.
* @exception IllegalArgumentException if the object cannot be converted.
*/
public static ASN1Sequence getInstance(
Object obj)
{
if (obj == null || obj instanceof ASN1Sequence)
{
return (ASN1Sequence)obj;
}
throw new IllegalArgumentException("unknown object in getInstance");
}
/**
* 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 <b>should</b>
* be using this method.
*
* @param obj the tagged object.
* @param explicit true if the object is meant to be explicitly tagged,
* false otherwise.
* @exception IllegalArgumentException if the tagged object cannot
* be converted.
*/
public static ASN1Sequence getInstance(
ASN1TaggedObject obj,
boolean explicit)
{
if (explicit)
{
if (!obj.isExplicit())
{
throw new IllegalArgumentException("object implicit - explicit expected.");
}
return (ASN1Sequence)obj.getObject();
}
else
{
//
// constructed object which appears to be explicitly tagged
// when it should be implicit means we have to add the
// surrounding sequence.
//
if (obj.isExplicit())
{
if (obj instanceof BERTaggedObject)
{
return new BERSequence(obj.getObject());
}
else
{
return new DERSequence(obj.getObject());
}
}
else
{
if (obj.getObject() instanceof ASN1Sequence)
{
return (ASN1Sequence)obj.getObject();
}
}
}
throw new IllegalArgumentException(
"unknown object in getInstanceFromTagged");
}
public Enumeration getObjects()
{
return seq.elements();
}
/**
* return the object at the sequence postion indicated by index.
*
* @param index the sequence number (starting at zero) of the object
* @return the object at the sequence postion indicated by index.
*/
public DEREncodable getObjectAt(
int index)
{
return (DEREncodable)seq.elementAt(index);
}
/**
* return the number of objects in this sequence.
*
* @return the number of objects in this sequence.
*/
public int size()
{
return seq.size();
}
public int hashCode()
{
Enumeration e = this.getObjects();
int hashCode = 0;
while (e.hasMoreElements())
{
Object o = e.nextElement();
if (o != null)
{
hashCode ^= o.hashCode();
}
}
return hashCode;
}
public boolean equals(
Object o)
{
if (o == null || !(o instanceof ASN1Sequence))
{
return false;
}
ASN1Sequence other = (ASN1Sequence)o;
if (this.size() != other.size())
{
return false;
}
Enumeration s1 = this.getObjects();
Enumeration s2 = other.getObjects();
while (s1.hasMoreElements())
{
Object o1 = s1.nextElement();
Object o2 = s2.nextElement();
if (o1 != null && o2 != null)
{
if (!o1.equals(o2))
{
return false;
}
}
else if (o1 == null && o2 == null)
{
continue;
}
else
{
return false;
}
}
return true;
}
protected void addObject(
DEREncodable obj)
{
seq.addElement(obj);
}
abstract void encode(DEROutputStream out)
throws IOException;
}
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