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Java > Open Source Codes > com > db4o > nativequery > expr > cmp > ComparisonOperator


1 /* Copyright (C) 2004 - 2006 db4objects Inc. http://www.db4o.com
2
3 This file is part of the db4o open source object database.
4
5 db4o is free software; you can redistribute it and/or modify it under
6 the terms of version 2 of the GNU General Public License as published
7 by the Free Software Foundation and as clarified by db4objects' GPL
8 interpretation policy, available at
9 http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10 Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11 Suite 350, San Mateo, CA 94403, USA.
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13 db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
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18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 package com.db4o.nativequery.expr.cmp;
22
23 // TODO: switch to individual classes and visitor dispatch?
24 public final class ComparisonOperator {
25     public final static int EQUALS_ID=0;
26     public final static int SMALLER_ID=1;
27     public final static int GREATER_ID=2;
28     public final static int CONTAINS_ID=3;
29     public final static int STARTSWITH_ID=4;
30     public final static int ENDSWITH_ID=5;
31     
32     public final static ComparisonOperator EQUALS=new ComparisonOperator(EQUALS_ID,"==", true);
33     public final static ComparisonOperator SMALLER=new ComparisonOperator(SMALLER_ID,"<", false);
34     public final static ComparisonOperator GREATER=new ComparisonOperator(GREATER_ID,">", false);
35     public final static ComparisonOperator CONTAINS=new ComparisonOperator(CONTAINS_ID,"<CONTAINS>", false);
36     public final static ComparisonOperator STARTSWITH=new ComparisonOperator(STARTSWITH_ID,"<STARTSWITH>", false);
37     public final static ComparisonOperator ENDSWITH=new ComparisonOperator(ENDSWITH_ID,"<ENDSWITH>", false);
38     
39     private int _id;
40     private String JavaDoc _op;
41     private boolean _symmetric;
42     
43     private ComparisonOperator(int id, String JavaDoc op, boolean symmetric) {
44         _id=id;
45         _op=op;
46         _symmetric=symmetric;
47     }
48     
49     public int id() {
50         return _id;
51     }
52     
53     public String JavaDoc toString() {
54         return _op;
55     }
56     
57     public boolean isSymmetric() {
58         return _symmetric;
59     }
60 }
61
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