jdbmenumerator.java

NMS jdbm

// Developed by Kinva Network Inc. 2000


// Source File Name:   jdbmEnumerator.java

package com.kinva.util.jdbm;

import java.io.IOException;
import java.util.Enumeration;
import java.util.NoSuchElementException;

// Referenced classes of package com.kinva.util.jdbm:
//            jdbm, jdbmBucket, jdbmBucketElement

class jdbmEnumerator
    implements Enumeration
{

    jdbmEnumerator(jdbm jdbm1, boolean flag, int i)
    {
        didx = -1;
        bdone = false;
        keys = false;
        dbm = jdbm1;
        keys = flag;
        didx = i;
        bucket = bucket;
        try
        {
            jdbm1.getNextBucket(this);
            return;
        }
        catch(IOException _ex)
        {
            throw new RuntimeException("jdbm: enumeration failure.");
        }
    }

    private final byte[] computeNextElement()
    {
        try
        {
            while(bucket != null) 
            {
                while(bidx < dbm.bucket_elems) 
                {
                    if(bucket.elements[bidx].hashval != -1)
                    {
                        byte abyte0[] = keys ? dbm.readKey(bucket.elements[bidx]) : dbm.readData(bucket.elements[bidx]);
                        bidx++;
                        return abyte0;
                    }
                    bidx++;
                }
                if(!dbm.getNextBucket(this))
                    return null;
            }
        }
        catch(IOException ioexception)
        {
            ioexception.printStackTrace();
            throw new RuntimeException("jdbm: enumeration failure.");
        }
        return null;
    }

    public boolean hasMoreElements()
    {
        if(next == null)
            next = computeNextElement();
        return next != null;
    }

    public Object nextElement()
    {
        byte abyte0[] = next;
        if(abyte0 == null && (abyte0 = computeNextElement()) == null)
        {
            throw new NoSuchElementException("jdbm");
        } else
        {
            next = null;
            return abyte0;
        }
    }

    int didx;
    jdbmBucket bucket;
    jdbm dbm;
    boolean bdone;
    boolean keys;
    int bidx;
    byte next[];
}