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1
22
23 package org.xquark.extractor.algebra;
24
25 import java.util.*;
26
27 import org.xquark.extractor.common.Debug;
28 import org.xquark.extractor.common.SqlWrapperException;
29 import org.xquark.extractor.sql.SqlExpression;
30
31 public class Table extends Expression implements Relation {
32
33 private static final String  RCSRevision = "$Revision: 1.5 $";
34
35 private static final String RCSName = "$Name: $";
36
37 protected org.xquark.extractor.metadata.Table _table;
38
39 protected List _attributes;
40
41 protected List _keys;
42
43 private Set _providedTableInstances = Collections.singleton(this);
44
45
49 protected List _usedKeysAttributeList = null;
50
51 public Table(org.xquark.extractor.metadata.Table table) {
52 setTable(table);
53 }
54
55 synchronized Object clone(Map clonedExprs)
56 throws CloneNotSupportedException {
57 Table retVal = (Table) super.clone(clonedExprs);
58 clonedExprs.put(this, retVal);
59 return retVal;
60
61 }
62
63
68 public org.xquark.extractor.metadata.Table getTable() {
69 return _table;
70 }
71
72
78 public void setTable(org.xquark.extractor.metadata.Table aTable) {
79 _table = aTable;
80 Debug.assertTrue(null != _table, "null!=_table");
81
82 List mAttributes = _table.getChildren();
83
84
85 _attributes = new ArrayList();
86
87 org.xquark.extractor.metadata.Attribute mAttr;
88 Attribute attribute;
89 Iterator iter = mAttributes.iterator();
90 while (iter.hasNext()) {
91 mAttr = (org.xquark.extractor.metadata.Attribute) iter.next();
92 attribute = new Attribute(mAttr);
93 _attributes.add(attribute);
94 }
95
96
97 List keysInMetadata = null;
98
99 keysInMetadata = _table.getKeys();
100 if (null != keysInMetadata) {
101 _keys = new ArrayList();
102 List key = null;
103 Attribute keyAttribute = null;
104
105 List keyInMetadata = null;
106 org.xquark.extractor.metadata.Attribute keyAttributeInMetadata = null;
107 for (int i = 0; i < keysInMetadata.size(); i++) {
108 keyInMetadata = (List) keysInMetadata.get(i);
109 key = new ArrayList();
110 for (int j = 0; j < keyInMetadata.size(); j++) {
111 keyAttributeInMetadata = (org.xquark.extractor.metadata.Attribute) keyInMetadata
112 .get(j);
113
114 if (keyAttributeInMetadata instanceof org.xquark.extractor.metadata.PseudoAttribute) {
115 if (keyAttributeInMetadata.getName().equalsIgnoreCase(
116 "rowid")) {
117 keyAttribute = new PseudoAttribute(
118 (org.xquark.extractor.metadata.PseudoAttribute) keyAttributeInMetadata);
119 } else {
120 Debug
121 .nyi("PseudoAttribute other than oracle rowid");
122 }
123 } else if (keyAttributeInMetadata instanceof org.xquark.extractor.metadata.Attribute) {
124 keyAttribute = findAttribute(keyAttributeInMetadata);
125 } else {
126 Debug.nyi("unknow key attribute");
127 }
128
129 Debug.assertTrue(null != keyAttribute,
130 "null != keyAttribute");
131 key.add(keyAttribute);
132 }
133 _keys.add(key);
134 }
135 }
136 }
137
138 protected Attribute findAttribute(
139 org.xquark.extractor.metadata.Attribute attributeInMetadata) {
140 Attribute retVal = null;
141
142 org.xquark.extractor.metadata.Attribute cursor = null;
143 for (int i = 0; i < _attributes.size(); i++) {
144 cursor = ((Attribute) _attributes.get(i)).getAttribute();
145 if (cursor.equals(attributeInMetadata)) {
146 retVal = (Attribute) _attributes.get(i);
147 break;
148 }
149 }
150 return retVal;
151 }
152
153
158 public List getAttributes() {
159 return _attributes;
160 }
161
162 public List getOperands() {
163 return null;
164 }
165
166
172 public void setAttributes(List aAttributes) {
173 _attributes = aAttributes;
174 }
175
176 public String getName() {
177 return _table.getName();
178 }
179
180 public String getAlias() {
181 return _table.getAlias();
182 }
183
184 public String getSchemaName() {
185 return _table.getFather().getName();
186 }
187
188 public String getCatalogName() {
189 return _table.getFather().getFather().getName();
190 }
191
192 public Set providedTableInstances() {
193 return _providedTableInstances;
194 }
195
196 public Set visibleTableInstances() {
197 return providedTableInstances();
198 }
199
200 public AttributeExpression findNonNullAttribute() {
201 Iterator it = _attributes.iterator();
202 Attribute att = null;
203 AttributeExpression ret = null;
204
205 while (it.hasNext() && ret == null) {
206 att = (Attribute) it.next();
207 if (!att.getAttribute().getNullable()) {
208 ret = new AttributeExpression(null, att.getName());
209 ret.setUnderlyingExpr(att);
210 }
211 }
212 return ret;
213 }
214
215 public List getKeys() {
216 return _keys;
217 }
218
219 public List nameTest(String name) {
220 List retVal = null;
221
222 if (name.equalsIgnoreCase("*")) {
223 retVal = _attributes;
224 } else if (null == name) {
225 retVal = null;
226 } else {
227 retVal = new ArrayList();
228
229 Iterator iter = _attributes.iterator();
230 Attribute item;
231 while (iter.hasNext()) {
232 item = (Attribute) iter.next();
233 if (item.getAlias().equalsIgnoreCase(name)) {
234 retVal.add(item);
235 }
236 }
237 if (0 == retVal.size()) {
238 retVal = null;
239 }
240 }
241
242 return retVal;
243 }
244
245 public String pprintStructure() {
246 StringBuffer retVal = new StringBuffer ();
247
248 String newLine = System.getProperty("line.separator");
249
250 retVal.append("Table : ");
251 retVal.append(_table.getName());
252 retVal.append(newLine);
253
254 for (int i = 0; i < _attributes.size(); i++) {
255 retVal.append("\t");
256 retVal.append(((Attribute) _attributes.get(i)).pprint());
257 retVal.append(newLine);
258 }
259 return retVal.toString();
260 }
261
262 public void setUsedKeyAttributeList(List list) {
263 _usedKeysAttributeList = list;
264 }
265
266 public List getUsedKeyAttributeList() {
267 return _usedKeysAttributeList;
268 }
269
270 public SqlExpression accept(GenSqlVisitor visitor)
271 throws SqlWrapperException {
272 return visitor.visit(this);
273 }
274
275 public void accept(AlgebraVisitor visitor) throws SqlWrapperException {
276 visitor.visit(this);
277 }
278
279
282 public boolean deepEquals(Object o) {
283 if (o instanceof Table) {
284 Table cast = (Table) o;
285 return _table.equals(cast.getTable()); }
289 return false;
290 }
291 } |
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