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The Bouncy Castle Java APIs for the OpenPGP Protocol. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.openpgp;

import org.bouncycastle.bcpg.UserAttributeSubpacket;
import org.bouncycastle.bcpg.UserAttributeSubpacketTags;
import org.bouncycastle.bcpg.UserDataPacket;
import org.bouncycastle.bcpg.attr.ImageAttribute;

/**
 * Container for a list of user attribute subpackets.
 */
public class PGPUserAttributeSubpacketVector implements UserDataPacket
{
    public static PGPUserAttributeSubpacketVector fromSubpackets(UserAttributeSubpacket[] packets)
    {
        if (packets == null)
        {
            packets = new UserAttributeSubpacket[0];
        }
        return new PGPUserAttributeSubpacketVector(packets);
    }

    UserAttributeSubpacket[] packets;

    PGPUserAttributeSubpacketVector(
        UserAttributeSubpacket[]    packets)
    {
        this.packets = packets;
    }

    public UserAttributeSubpacket getSubpacket(
        int    type)
    {
        for (int i = 0; i != packets.length; i++)
        {
            if (packets[i].getType() == type)
            {
                return packets[i];
            }
        }
        
        return null;
    }
    
    public ImageAttribute getImageAttribute()
    {
        UserAttributeSubpacket    p = this.getSubpacket(UserAttributeSubpacketTags.IMAGE_ATTRIBUTE);
        
        if (p == null)
        {
            return null;
        }
                    
        return (ImageAttribute)p;
    }
    
    UserAttributeSubpacket[] toSubpacketArray()
    {
        return packets;
    }
    
    public boolean equals(
        Object o)
    {
        if (o == this)
        {
            return true;
        }
        
        if (o instanceof PGPUserAttributeSubpacketVector)
        {
            PGPUserAttributeSubpacketVector    other = (PGPUserAttributeSubpacketVector)o;
            
            if (other.packets.length != packets.length)
            {
                return false;
            }
            
            for (int i = 0; i != packets.length; i++)
            {
                if (!other.packets[i].equals(packets[i]))
                {
                    return false;
                }
            }
            
            return true;
        }
        
        return false;
    }
    
    public int hashCode()
    {
        int    code = 0;
        
        for (int i = 0; i != packets.length; i++)
        {
            code ^= packets[i].hashCode();
        }
        
        return code;
    }
}