001/*
002 * Copyright (c) 2004-2010 The Regents of the University of California.
003 * All rights reserved.
004 *
005 * '$Author: welker $'
006 * '$Date: 2010-05-06 05:21:26 +0000 (Thu, 06 May 2010) $' 
007 * '$Revision: 24234 $'
008 * 
009 * Permission is hereby granted, without written agreement and without
010 * license or royalty fees, to use, copy, modify, and distribute this
011 * software and its documentation for any purpose, provided that the above
012 * copyright notice and the following two paragraphs appear in all copies
013 * of this software.
014 *
015 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
016 * FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
017 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
018 * THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
019 * SUCH DAMAGE.
020 *
021 * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
022 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
023 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
024 * PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
025 * CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
026 * ENHANCEMENTS, OR MODIFICATIONS.
027 *
028 */
029
030package org.kepler.objectmanager.data.db;
031
032/**
033 * This intergace represents an abstract Constraint in eml2
034 * 
035 * @author Jing Tao
036 * 
037 */
038
039public interface Constraint {
040        // constant
041        public static final int PRIMARYKEY = 0;
042        public static final int UNIQUEKEY = 1;
043        public static final int FOREIGNKEY = 2;
044        public static final int NOTNULLCONSTRAINT = 3;
045        public static final int JOINCONDITIONCONSTRAINT = 4;
046        public static final String CONSTRAINT = "CONSTRAINT";
047        public static final String SPACESTRING = " ";
048        public static final String RIGHTPARENTH = ")";
049        public static final String LEFTPARENTH = "(";
050        public static final String COMMA = ",";
051        public static final String PRIMARYKEYSTRING = "PRIMARY KEY";
052        public static final String UNIQUEKEYSTRING = "UNIQUE";
053        public static final String FOREIGNKEYSTRING = "FOREIGN KEY";
054        public static final String REFERENCESTRING = "REFERENCES";
055        public static final String NOTNULLSTRING = " NOT NULL ";
056
057        // abtract method to get constraint type
058        public int getType();
059
060        // abtract method to transfer a constraint to a string
061        public String printString() throws UnWellFormedConstraintException;
062}