Simple LDAP Connection-Class for java

LDAP.java

import java.util.ArrayList;
import java.util.Properties;

import javax.naming.Context;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attributes;
import javax.naming.directory.InitialDirContext;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;

public class LDAP {
    private static final String CONTEXT_FACTORY = "com.sun.jndi.ldap.LdapCtxFactory";

    private InitialDirContext ctx;
    private String basedn;
    private SearchControls ctrls;

    private LDAP(String url, String user, String password, String b) throws NamingException {
        ctx = LDAP.doConnect(url, user, password);
        basedn = b.length() > 0 ? "," + b : b;
        ctrls = new SearchControls();
    }

    public ArrayList<Attributes> search(String base, String filter) throws NamingException {
        NamingEnumeration<SearchResult> ne = ctx.search(base + basedn, filter, ctrls);
        ArrayList<Attributes> arr = new ArrayList<>();
        while(ne.hasMore()) {
            arr.add(ne.next().getAttributes());
        }
        return arr;
    }

    public Attributes get(String base) throws NamingException {
        return ctx.getAttributes(base + basedn);
    }

    private static InitialDirContext doConnect(String url, String user, String password) throws NamingException {
        Properties props = new Properties();
        props.put(Context.INITIAL_CONTEXT_FACTORY, CONTEXT_FACTORY);
        props.put(Context.PROVIDER_URL, url);
        props.put(Context.SECURITY_PRINCIPAL, user);
        props.put(Context.SECURITY_CREDENTIALS, password);

        return new InitialDirContext(props);
    }

    public static LDAP connect(String url, String user, String pass, String basedn) throws NamingException {
        return new LDAP(url, user, pass, basedn);
    }

    public static boolean testConnection(String url, String user, String password) {
        try {
            return LDAP.doConnect(url, user, password) != null;
        } catch (Exception e) {
            return false;
        }
    }
}