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package netscape.softupdate;

import java.util.Enumeration;
import java.util.NoSuchElementException;
import netscape.security.PrivilegeManager;

/**
 * Helper class used to enumerate Registry subkeys
 * @see RegistryNode#subkeys
 */
final class RegKeyEnumerator implements Enumeration {
    private String       path = "";
    private Registry     reg = null;
    private int          key = 0;
    private int          state = 0;
    private int          style = 0;
    private String       target;

    RegKeyEnumerator(Registry registry, int startKey, int enumStyle, String targ)
    {
        reg   = registry;
        key   = startKey;
        style = enumStyle;
        target = targ;
    }

    public boolean hasMoreElements() {
        PrivilegeManager.checkPrivilegeEnabled( target );
        String  tmp = regNext(false);

        return (tmp != null);
    }

    public Object nextElement() {
        PrivilegeManager.checkPrivilegeEnabled( target );
        path = regNext(true);
        if (path == null) {
            throw new NoSuchElementException("RegKeyEnumerator");
        }
        return path;
    }

    private native String regNext(boolean skip);
}