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[simantics/platform.git] / bundles / org.simantics.mapping / src / org / simantics / mapping / constraint / instructions / IInstruction.java
1 /*******************************************************************************\r
2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
3  * in Industry THTH ry.\r
4  * All rights reserved. This program and the accompanying materials\r
5  * are made available under the terms of the Eclipse Public License v1.0\r
6  * which accompanies this distribution, and is available at\r
7  * http://www.eclipse.org/legal/epl-v10.html\r
8  *\r
9  * Contributors:\r
10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
11  *******************************************************************************/\r
12 package org.simantics.mapping.constraint.instructions;\r
13 \r
14 import gnu.trove.map.hash.TIntIntHashMap;\r
15 import gnu.trove.set.hash.TIntHashSet;\r
16 \r
17 import org.simantics.db.ReadGraph;\r
18 import org.simantics.db.WriteGraph;\r
19 import org.simantics.db.exception.DatabaseException;\r
20 import org.simantics.mapping.IContextualModification;\r
21 \r
22 public interface IInstruction {\r
23         \r
24         public static final boolean DEBUG = false;\r
25         public static final boolean DEBUG_MODI = false;\r
26         public static final boolean DISABLE_MODI = false; // Disables modifications, if DEBUG_MODI is true\r
27                                                           // just prints intended modifications\r
28         public static final String INDENTATION = "     ";\r
29         \r
30         /**\r
31          * Return value for query that finds no bindings.\r
32          */\r
33         public static final Object FAILURE = new Object();\r
34         \r
35         /**\r
36          * \r
37          * @param state\r
38          * @return FAILURE, if query failed\r
39          *         null, if query succeeded but there is only one possible binding\r
40          *         something else, if query succeeded and there might be more than one binding                                 \r
41          */\r
42         Object query(ReadGraph g, Object[] bindings) throws DatabaseException;\r
43         \r
44         /**\r
45          * @param state\r
46          * @param continuation\r
47          * @return FAILURE, if there are no more results\r
48          *         null, if this was the last result\r
49          *         non-null, if there were one result and may be more\r
50          */\r
51         Object next(ReadGraph g, Object[] bindings, Object continuation) throws DatabaseException;      \r
52         \r
53         IContextualModification claim(ReadGraph g, Object[] bindings) throws DatabaseException;\r
54         void doClaim(WriteGraph g, Object[] bindings) throws DatabaseException;\r
55         IContextualModification deny(ReadGraph g, Object[] bindings) throws DatabaseException;\r
56         void doDeny(WriteGraph g, Object[] bindings) throws DatabaseException;\r
57                 \r
58         void collectVariables(TIntHashSet reads, TIntHashSet writes);\r
59         void mapVariables(TIntIntHashMap map);\r
60         \r
61         void toString(StringBuilder b, int indent);\r
62         \r
63 }\r