package com.c2kernel.lookup;

import java.util.Enumeration;

import com.c2kernel.process.Gateway;
import com.c2kernel.utils.Logger;
import com.novell.ldap.LDAPEntry;
import com.novell.ldap.LDAPException;
import com.novell.ldap.LDAPSearchResults;

/**************************************************************************
 *
 * $Revision: 1.6 $
 * $Date: 2005/12/01 14:23:14 $
 *
 * Copyright (C) 2003 CERN - European Organization for Nuclear Research
 * All rights reserved.
 **************************************************************************/



public class LDAPPathSet implements Enumeration<Path> {
    LDAPSearchResults results;
    LDAPEntry nextEntry;

    public LDAPPathSet() { // empty
        results = null;
    }

    public LDAPPathSet(LDAPSearchResults results) {
        this.results = results;
    }

    @Override
	public boolean hasMoreElements() {
        if (results == null) return false;
        if (nextEntry != null) return true;
        if (results.hasMore())
        try {
            nextEntry = results.next();
            return true;
        } catch (LDAPException ex) {
        	if (ex.getResultCode()!=32) {// no results
        		Logger.error(ex);
        		Logger.error("Error loading LDAP result set: "+ex.getMessage());
        	}
        }
        return false;
    }

    @Override
	public Path nextElement() {
        if (results == null) return null;
        try {
            if (nextEntry == null)
                nextEntry = results.next();
            Path nextPath = ((LDAPLookup)Gateway.getLookup()).nodeToPath(nextEntry);
            nextEntry = null;
            return nextPath;
        } catch (Exception ex) {
            Logger.error("Error loading next path");
            Logger.error(ex);
            nextEntry = null;
            if (hasMoreElements()) {
                Logger.error("Skipping to next entry");
                return nextElement();
            }
            else
                return null;
        }
    }
}