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1
21 package com.db4o;
22
23 import com.db4o.config.ObjectField;
24 import com.db4o.foundation.*;
25
26 class Config4Field extends Config4Abstract implements ObjectField, DeepClone {
27
28 private final Config4Class _configClass;
29
30 private final static KeySpec QUERY_EVALUATION=new KeySpec(true);
31
32 private final static KeySpec INDEXED=new KeySpec(YapConst.DEFAULT);
33
34 protected Config4Field(Config4Class a_class, KeySpecHashtable4 config) {
35 super(config);
36 _configClass = a_class;
37 }
38
39 Config4Field(Config4Class a_class, String  a_name) {
40 _configClass = a_class;
41 setName(a_name);
42 }
43
44 private Config4Class classConfig() {
45 return _configClass;
46 }
47
48 String className() {
49 return classConfig().getName();
50 }
51
52 public Object deepClone(Object param) {
53 return new Config4Field((Config4Class)param, _config);
54 }
55
56 public void queryEvaluation(boolean flag) {
57 _config.put(QUERY_EVALUATION, flag);
58 }
59
60 public void rename(String newName) {
61 classConfig().config().rename(new Rename(className(), getName(), newName));
62 setName(newName);
63 }
64
65 public void indexed(boolean flag) {
66 putThreeValued(INDEXED, flag);
67 }
68
69 public void initOnUp(Transaction systemTrans, YapField yapField) {
70
71 YapStream anyStream = systemTrans.stream();
72 if (!anyStream.maintainsIndices()) {
73 return;
74 }
75 if(Debug.indexAllFields){
76 indexed(true);
77 }
78 if (! yapField.supportsIndex()) {
79 indexed(false);
80 }
81
82 YapFile stream = (YapFile)anyStream;
83 int indexedFlag=_config.getAsInt(INDEXED);
84 if (indexedFlag == YapConst.NO) {
85 yapField.dropIndex(systemTrans);
86 return;
87 }
88
89 if (useExistingIndex(systemTrans, yapField)) {
90 return;
91 }
92
93 if (indexedFlag != YapConst.YES) {
94 return;
95 }
96
97 createIndex(systemTrans, yapField, stream);
98 }
99
100 private boolean useExistingIndex(Transaction systemTrans, YapField yapField) {
101 return yapField.getIndex(systemTrans) != null;
102 }
103
104 private void createIndex(Transaction systemTrans, YapField yapField, YapFile stream) {
105 if (stream.configImpl().messageLevel() > YapConst.NONE) {
106 stream.message("creating index " + yapField.toString());
107 }
108 yapField.initIndex(systemTrans);
109 stream.setDirtyInSystemTransaction(yapField.getParentYapClass());
110 reindex(systemTrans, yapField, stream);
111 }
112
113 private void reindex(Transaction systemTrans, YapField yapField, YapFile stream) {
114 YapClass yapClass = yapField.getParentYapClass();
115 if (yapField.rebuildIndexForClass(stream, yapClass)) {
116 systemTrans.commit();
117 }
118 }
119
120 boolean queryEvaluation() {
121 return _config.getAsBoolean(QUERY_EVALUATION);
122 }
123
124
125 }
126 |
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