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1
27 package com.genimen.djeneric.repository;
28
29 import java.util.ArrayList  ;
30 import java.util.StringTokenizer ;
31
32 import com.genimen.djeneric.language.Messages;
33 import com.genimen.djeneric.repository.exceptions.CatalogException;
34 import com.genimen.djeneric.repository.exceptions.DjenericException;
35 import com.genimen.djeneric.repository.exceptions.ObjectNotDefinedException;
36 import com.genimen.djeneric.repository.exceptions.RestrictionFailedException;
37
38 public class DjRestriction
39 {
40 DjProperty[] _restrictedPath = null;
41 DjProperty[] _restrictingPath = null;
42
43 String _originalExpression;
44 DjRelation _relation;
45
46 public DjRestriction(DjRelation relation, String expression) throws CatalogException
47 {
48 _relation = relation;
49 _originalExpression = expression;
50
51 try
52 {
53 parse(expression);
54 }
55 catch (ObjectNotDefinedException onde)
56 {
57 throw new CatalogException(onde);
58 }
59 }
60
61 protected void unregister()
62 {
63 }
65
66 public DjRelation getRelation()
67 {
68 return _relation;
69 }
70
71 public String getExpression()
72 {
73 return _originalExpression;
74 }
75
76 public DjExtent getBaseExtent()
77 {
78 return _relation.getDetailExtent();
79 }
80
81 public DjExtent getMasterExtent()
82 {
83 return _relation.getMasterExtent();
84 }
85
86 public DjProperty getTopLevelRestrictedProperty()
87 {
88 return _restrictedPath[_restrictedPath.length - 1];
89 }
90
91 public DjProperty getTopLevelRestrictingProperty()
92 {
93 return _restrictingPath[_restrictedPath.length - 1];
94 }
95
96 public DjProperty getRestrictedProperty()
97 {
98 return _restrictedPath[0];
99 }
100
101 public DjProperty getRestrictingProperty()
102 {
103 return _restrictingPath[0];
104 }
105
106 public void parse(String expression) throws CatalogException, ObjectNotDefinedException
107 {
108 String matchOp = "==";
109
110 int eqIdx = expression.indexOf(matchOp);
111 if (eqIdx == -1)
112 {
113 matchOp = "=";
114 eqIdx = expression.indexOf(matchOp);
115 if (eqIdx == -1) throw new CatalogException(Messages.getString("DjRestriction.InvalidRestriction", expression));
116 }
117
118 String left = expression.substring(0, eqIdx).trim();
119 String right = expression.substring(eqIdx + matchOp.length()).trim();
120
121 DjProperty propLeft = _relation.getDetailExtent().getProperty(left);
122 DjProperty propRight = _relation.getDetailExtent().getProperty(right);
123
124 if ((propLeft.getType() instanceof DjExtent) && (propRight.getType() instanceof DjExtent))
125 {
126 DjExtent typeLeft = (DjExtent) propLeft.getType();
127 DjExtent typeRight = (DjExtent) propRight.getType();
128 if (!typeLeft.isInstanceof(typeRight) && !typeRight.isInstanceof(typeLeft))
129 {
130 throw new CatalogException(Messages.getString("DjRestriction.InvalidRestrictionTypes", expression));
131 }
132 }
133 else throw new CatalogException(Messages.getString("DjRestriction.InvalidRestrictionTypes", expression));
134
135 DjProperty[] leftPath = parsePart(left);
136 DjProperty[] rightPath = parsePart(right);
137
138 if (leftPath.length < 1)
139 {
140 throw new CatalogException(Messages.getString("DjRestriction.InvalidRestrictionLeft"));
141 }
142 if (rightPath.length < 1)
143 {
144 throw new CatalogException(Messages.getString("DjRestriction.InvalidRestrictionRight"));
145 }
146
147 DjProperty leftProperty = leftPath[leftPath.length - 1];
148 DjProperty rightProperty = rightPath[rightPath.length - 1];
149
150 if ((leftProperty.getExtent() != getMasterExtent()) && (rightProperty.getExtent() != getMasterExtent()))
151 {
152 throw new CatalogException(Messages.getString("DjRestriction.MasterNotReferenced", getMasterExtent().getName()));
153 }
154
155 boolean pathToMasterOnLeft = leftPath[leftPath.length - 1].getExtent() == getMasterExtent();
156
157
165 if (leftPath[leftPath.length - 1].getExtent() == getMasterExtent()
166 && rightPath[rightPath.length - 1].getExtent() == getMasterExtent())
167 {
168 pathToMasterOnLeft = leftPath.length > rightPath.length;
169 }
170
171 if (pathToMasterOnLeft)
172 {
173 _restrictedPath = leftPath;
174 _restrictingPath = rightPath;
175 }
176 else
177 {
178 _restrictedPath = rightPath;
179 _restrictingPath = leftPath;
180 }
181
182 for (int i = 0; i < _restrictingPath.length - 1; i++)
188 {
189 DjProperty prop = _restrictingPath[i];
190 DjRelation rel = prop.getExtent().getMasterRelationByPropertyName(prop.getName());
191
192 _restrictingPath[i + 1].addPropertyRestriction(new DjPropertyRestriction(rel, this));
195 }
196
197 for (int i = 0; i < _restrictedPath.length; i++)
198 {
199 DjProperty prop = _restrictedPath[i];
200 prop.setIsPartOfRestrictedPath(true);
201 }
202 }
203
204 protected DjProperty[] parsePart(String part) throws CatalogException, ObjectNotDefinedException
205 {
206 ArrayList path = new ArrayList ();
207
208 DjProperty property = null;
209 DjExtent currentExtent = getBaseExtent();
210 StringTokenizer st = new StringTokenizer (part, ".");
211
212 while (st.hasMoreElements())
213 {
214 property = currentExtent.getProperty(st.nextToken().trim());
215 path.add(property);
216 if (!(property.getType() instanceof DjExtent))
217 {
218 throw new CatalogException(Messages.getString("global.propNotUsed", property.getName()));
219 }
220 currentExtent = (DjExtent) property.getType();
221 }
222 return (DjProperty[]) path.toArray(new DjProperty[0]);
223 }
224
225 public long evaluate(DjObject obj) throws DjenericException
226 {
227 if (obj.getExtent() != getBaseExtent())
228 {
229 throw new DjenericException(Messages.getString("DjRestriction.WrongType", obj.getExtent().getObjectType(),
230 getBaseExtent().getObjectType()));
231 }
232
233 for (int i = 0; i < _restrictingPath.length; i++)
234 {
235 Object anObj = obj.get(_restrictingPath[i].getName());
236
237 if (anObj == null)
238 {
239 throw new RestrictionFailedException(Messages
240 .getString("DjRestriction.PropNull", _restrictingPath[i].getName()));
241 }
242 if (!(anObj instanceof DjObject))
243 {
244 throw new DjenericException(Messages.getString("global.propNotUsed", _restrictingPath[i].getName()));
245 }
246 obj = (DjObject) anObj;
247 }
248 return obj.getObjectId();
249 }
250 } |
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