Source Code Cross Referenced for QueryEvaluationMode.java in  » Database-DBMS » db4o-6.4 » com » db4o » config » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db4o 6.4 » com.db4o.config 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /* Copyright (C) 2004 - 2007  db4objects Inc.  http://www.db4o.com
02:
03:        This file is part of the db4o open source object database.
04:
05:        db4o is free software; you can redistribute it and/or modify it under
06:        the terms of version 2 of the GNU General Public License as published
07:        by the Free Software Foundation and as clarified by db4objects' GPL 
08:        interpretation policy, available at
09:        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.
12:
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.
17:
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.config;
22:
23:        /**
24:         * This class provides static constants for the query evaluation
25:         * modes that db4o supports. 
26:         * <br><br><b>For detailed documentation please see 
27:         * {@link QueryConfiguration#evaluationMode(QueryEvaluationMode)}</b> 
28:         */
29:        public class QueryEvaluationMode {
30:
31:            private final String _id;
32:
33:            private QueryEvaluationMode(String id) {
34:                _id = id;
35:            }
36:
37:            /**
38:             * Constant for immediate query evaluation. The query is executed fully
39:             * when Query#execute() is called.
40:             * <br><br><b>For detailed documentation please see 
41:             * {@link QueryConfiguration#evaluationMode(QueryEvaluationMode)}</b> 
42:             */
43:            public static final QueryEvaluationMode IMMEDIATE = new QueryEvaluationMode(
44:                    "IMMEDIATE");
45:
46:            /**
47:             * Constant for snapshot query evaluation. When Query#execute() is called,
48:             * the query processor chooses the best indexes, does all index processing
49:             * and creates a snapshot of the index at this point in time. Non-indexed
50:             * constraints are evaluated lazily when the application iterates through 
51:             * the {@link com.db4o.ObjectSet} resultset of the query.
52:             * <br><br><b>For detailed documentation please see 
53:             * {@link QueryConfiguration#evaluationMode(QueryEvaluationMode)}</b> 
54:             */
55:            public static final QueryEvaluationMode SNAPSHOT = new QueryEvaluationMode(
56:                    "SNAPSHOT");
57:
58:            /**
59:             * Constant for lazy query evaluation. When Query#execute() is called, the
60:             * query processor only chooses the best index and creates an iterator on 
61:             * this index. Indexes and constraints are evaluated lazily when the 
62:             * application iterates through the {@link com.db4o.ObjectSet} resultset of the query.
63:             * <br><br><b>For detailed documentation please see 
64:             * {@link QueryConfiguration#evaluationMode(QueryEvaluationMode)}</b> 
65:             */
66:            public static final QueryEvaluationMode LAZY = new QueryEvaluationMode(
67:                    "LAZY");
68:
69:            private static final QueryEvaluationMode[] MODES = new QueryEvaluationMode[] {
70:                    QueryEvaluationMode.IMMEDIATE,
71:                    QueryEvaluationMode.SNAPSHOT, QueryEvaluationMode.LAZY, };
72:
73:            /**
74:             * internal method, ignore please. 
75:             */
76:            public int asInt() {
77:                for (int i = 0; i < MODES.length; i++) {
78:                    if (MODES[i] == this ) {
79:                        return i;
80:                    }
81:                }
82:                throw new IllegalStateException();
83:            }
84:
85:            /**
86:             * internal method, ignore please. 
87:             */
88:            public static QueryEvaluationMode fromInt(int i) {
89:                return MODES[i];
90:            }
91:
92:            public String toString() {
93:                return _id;
94:            }
95:        }
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