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Java > Open Source Codes > com > versant > core > jdbc > metadata > JdbcFetchGroup


1
2 /*
3  * Copyright (c) 1998 - 2005 Versant Corporation
4  * All rights reserved. This program and the accompanying materials
5  * are made available under the terms of the Eclipse Public License v1.0
6  * which accompanies this distribution, and is available at
7  * http://www.eclipse.org/legal/epl-v10.html
8  *
9  * Contributors:
10  * Versant Corporation - initial API and implementation
11  */
12 package com.versant.core.jdbc.metadata;
13
14 import com.versant.core.metadata.StoreFetchGroup;
15 import com.versant.core.metadata.FetchGroup;
16 import com.versant.core.metadata.FieldMetaData;
17 import com.versant.core.metadata.FetchGroupField;
18 import com.versant.core.jdbc.FgDs;
19 import com.versant.core.common.BindingSupportImpl;
20
21 /**
22  * Extra JDBC specific info attached to a FetchGroup.
23  */
24 public class JdbcFetchGroup implements StoreFetchGroup {
25
26     public static int OPT_INC_SUBS = 1;
27     public static int OPT_START_OUTER = 2;
28
29     private FetchGroup fg;
30     private FgDs[] fgDses = new FgDs[4];
31
32     public JdbcFetchGroup() {
33     }
34
35     public void setFetchGroup(FetchGroup fg) {
36         this.fg = fg;
37     }
38
39     public FgDs getFgDs(boolean incSubClasses, boolean outer) {
40         int opts = createOpts(incSubClasses, outer);
41         FgDs fgDs = fgDses[opts];
42         if (fgDs == null) {
43             fgDs = new FgDs(null, fg, fg.name, opts);
44         }
45         return fgDs;
46     }
47
48     public FgDs getExistingFgDs(boolean incSubClasses, boolean outer) {
49         int opts = createOpts(incSubClasses, outer);
50         FgDs fgDs = fgDses[opts];
51         if (fgDs == null) {
52             StringBuffer JavaDoc msg = new StringBuffer JavaDoc();
53             msg.append("FgDs does not exist: " + fg.classMetaData.qname + "." +
54                     fg.name + " incSubClasses " + incSubClasses + " outer " +
55                     outer);
56             msg.append("\nincSubClasses outer FgDs");
57             msg.append("\nfalse false " + fgDses[createOpts(false, false)]);
58             msg.append("\nfalse true " + fgDses[createOpts(false, true)]);
59             msg.append("\ntrue false " + fgDses[createOpts(true, false)]);
60             msg.append("\ntrue true " + fgDses[createOpts(true, true)] + "\n");
61             throw BindingSupportImpl.getInstance().internal(msg.toString());
62         }
63         return fgDs;
64     }
65
66     public static int createOpts(boolean incSubClasses, boolean outer) {
67         int opt = 0;
68         if (incSubClasses) opt += OPT_INC_SUBS;
69         if (outer) opt += OPT_START_OUTER;
70         return opt;
71     }
72
73     public void setFgDs(FgDs fgDs) {
74         if (!fgDs.isFinished()) {
75             throw BindingSupportImpl.getInstance().internal(
76                     "The FetchPlan has not been finished");
77         }
78         fgDses[fgDs.getOpts()] = fgDs;
79     }
80
81     public void fieldAdded(FieldMetaData fmd) {
82         JdbcField jdbcField = ((JdbcField)fmd.storeField);
83         if (jdbcField.mainTableCols != null) {
84             fg.jdbcTotalCols += jdbcField.mainTableCols.length;
85         }
86     }
87
88     public void finish() {
89         FetchGroupField[] fields = fg.fields;
90         int nf = fields.length;
91         for (int i = nf - 1; i >= 0; i--) {
92             //select a default crossjoinField
93 if (fg.crossJoinedCollectionField == null
94                     && fields[i].fmd.storeField instanceof JdbcCollectionField
95                     && !(fields[i].fmd.storeField instanceof JdbcMapField)) {
96                 fg.crossJoinedCollectionField = fields[i];
97             }
98         }
99     }
100
101 }
102
103
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