/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-06 Wolfgang M. Meier
* wolfgang@exist-db.org
* http://exist.sourceforge.net
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id$
*/
package org.exist.xquery;
/**
* Defines occurrence indicators (*,?,+).
*
* @author wolf
*/
public class Cardinality {
public final static int ZERO = 1;
public final static int ONE = 2;
public final static int MANY = 4;
public final static int EMPTY = ZERO;
public final static int EXACTLY_ONE = ONE;
public final static int ONE_OR_MORE = ONE | MANY;
public final static int ZERO_OR_MORE = ZERO | ONE | MANY;
public final static int ZERO_OR_ONE = ZERO | ONE;
public final static String toString(int cardinality) {
switch(cardinality) {
case EMPTY:
return "empty()";
case EXACTLY_ONE:
return "";
case ONE_OR_MORE:
return "+";
case ZERO_OR_MORE:
return "*";
case ZERO_OR_ONE:
return "?";
default:
// impossible
throw new IllegalArgumentException("unknown cardinality: " + cardinality);
}
}
public final static String getDescription(int cardinality) {
switch(cardinality) {
case EMPTY:
return "empty";
case EXACTLY_ONE:
return "exactly one";
case ONE_OR_MORE:
return "one or more";
case ZERO_OR_MORE:
return "zero or more";
case ZERO_OR_ONE:
return "zero or one";
case MANY:
return "many";
default:
// impossible
throw new IllegalArgumentException("unknown cardinality: " + cardinality);
}
}
public final static boolean checkCardinality(int required, int cardinality) {
return ((required & cardinality) == cardinality);
}
}