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Java Source Code / Java Documentation » Rule Engine » drolls Rule Engine » org.drools.base.evaluators 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.drools.base.evaluators;
002:
003:        /*
004:         * Copyright 2005 JBoss Inc
005:         * 
006:         * Licensed under the Apache License, Version 2.0 (the "License");
007:         * you may not use this file except in compliance with the License.
008:         * You may obtain a copy of the License at
009:         * 
010:         *      http://www.apache.org/licenses/LICENSE-2.0
011:         * 
012:         * Unless required by applicable law or agreed to in writing, software
013:         * distributed under the License is distributed on an "AS IS" BASIS,
014:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015:         * See the License for the specific language governing permissions and
016:         * limitations under the License.
017:         */
018:
019:        import org.drools.base.BaseEvaluator;
020:        import org.drools.base.ValueType;
021:        import org.drools.common.InternalWorkingMemory;
022:        import org.drools.rule.VariableRestriction.ObjectVariableContextEntry;
023:        import org.drools.rule.VariableRestriction.VariableContextEntry;
024:        import org.drools.spi.Evaluator;
025:        import org.drools.spi.Extractor;
026:        import org.drools.spi.FieldValue;
027:
028:        /**
029:         * This is the misc "bucket" evaluator factory for objects.
030:         * It is fairly limited in operations, 
031:         * and what operations are available are dependent on the exact type.
032:         * 
033:         * @author Michael Neale
034:         */
035:        public class StringFactory implements  EvaluatorFactory {
036:
037:            private static final long serialVersionUID = 400L;
038:            private static EvaluatorFactory INSTANCE = new StringFactory();
039:
040:            private StringFactory() {
041:
042:            }
043:
044:            public static EvaluatorFactory getInstance() {
045:                if (StringFactory.INSTANCE == null) {
046:                    StringFactory.INSTANCE = new StringFactory();
047:                }
048:                return StringFactory.INSTANCE;
049:            }
050:
051:            public Evaluator getEvaluator(final Operator operator) {
052:                if (operator == Operator.EQUAL) {
053:                    return StringEqualEvaluator.INSTANCE;
054:                } else if (operator == Operator.NOT_EQUAL) {
055:                    return StringNotEqualEvaluator.INSTANCE;
056:                } else if (operator == Operator.MATCHES) {
057:                    return StringMatchesEvaluator.INSTANCE;
058:                } else if (operator == Operator.NOT_MATCHES) {
059:                    return StringNotMatchesEvaluator.INSTANCE;
060:                } else if (operator == Operator.MEMBEROF) {
061:                    return StringMemberOfEvaluator.INSTANCE;
062:                } else if (operator == Operator.NOTMEMBEROF) {
063:                    return StringNotMemberOfEvaluator.INSTANCE;
064:                } else {
065:                    throw new RuntimeException("Operator '" + operator
066:                            + "' does not exist for StringEvaluator");
067:                }
068:            }
069:
070:            static class StringEqualEvaluator extends BaseEvaluator {
071:                /**
072:                 * 
073:                 */
074:                private static final long serialVersionUID = 400L;
075:                public final static Evaluator INSTANCE = new StringEqualEvaluator();
076:
077:                private StringEqualEvaluator() {
078:                    super (ValueType.STRING_TYPE, Operator.EQUAL);
079:                }
080:
081:                public boolean evaluate(InternalWorkingMemory workingMemory,
082:                        final Extractor extractor, final Object object1,
083:                        final FieldValue object2) {
084:                    final Object value1 = extractor.getValue(workingMemory,
085:                            object1);
086:                    final Object value2 = object2.getValue();
087:                    if (value1 == null) {
088:                        return value2 == null;
089:                    }
090:                    return value1.equals(value2);
091:                }
092:
093:                public boolean evaluateCachedRight(
094:                        InternalWorkingMemory workingMemory,
095:                        final VariableContextEntry context, final Object left) {
096:                    final Object value = context.declaration.getExtractor()
097:                            .getValue(workingMemory, left);
098:                    if (value == null) {
099:                        return ((ObjectVariableContextEntry) context).right == null;
100:                    }
101:                    return value
102:                            .equals(((ObjectVariableContextEntry) context).right);
103:                }
104:
105:                public boolean evaluateCachedLeft(
106:                        InternalWorkingMemory workingMemory,
107:                        final VariableContextEntry context, final Object right) {
108:                    final Object value = context.extractor.getValue(
109:                            workingMemory, right);
110:                    if (((ObjectVariableContextEntry) context).left == null) {
111:                        return value == null;
112:                    }
113:                    return ((ObjectVariableContextEntry) context).left
114:                            .equals(value);
115:                }
116:
117:                public boolean evaluate(InternalWorkingMemory workingMemory,
118:                        final Extractor extractor1, final Object object1,
119:                        final Extractor extractor2, final Object object2) {
120:                    final Object value1 = extractor1.getValue(workingMemory,
121:                            object1);
122:                    final Object value2 = extractor2.getValue(workingMemory,
123:                            object2);
124:                    if (value1 == null) {
125:                        return value2 == null;
126:                    }
127:                    return value1.equals(value2);
128:                }
129:
130:                public String toString() {
131:                    return "String ==";
132:                }
133:
134:            }
135:
136:            static class StringNotEqualEvaluator extends BaseEvaluator {
137:                /**
138:                 * 
139:                 */
140:                private static final long serialVersionUID = 400L;
141:                public final static Evaluator INSTANCE = new StringNotEqualEvaluator();
142:
143:                private StringNotEqualEvaluator() {
144:                    super (ValueType.STRING_TYPE, Operator.NOT_EQUAL);
145:                }
146:
147:                public boolean evaluate(InternalWorkingMemory workingMemory,
148:                        final Extractor extractor, final Object object1,
149:                        final FieldValue object2) {
150:                    final Object value1 = extractor.getValue(workingMemory,
151:                            object1);
152:                    final Object value2 = object2.getValue();
153:                    if (value1 == null) {
154:                        return value2 != null;
155:                    }
156:                    return !value1.equals(value2);
157:                }
158:
159:                public boolean evaluateCachedRight(
160:                        InternalWorkingMemory workingMemory,
161:                        final VariableContextEntry context, final Object left) {
162:                    final Object value = context.declaration.getExtractor()
163:                            .getValue(workingMemory, left);
164:                    if (value == null) {
165:                        return ((ObjectVariableContextEntry) context).right != null;
166:                    }
167:                    return !value
168:                            .equals(((ObjectVariableContextEntry) context).right);
169:                }
170:
171:                public boolean evaluateCachedLeft(
172:                        InternalWorkingMemory workingMemory,
173:                        final VariableContextEntry context, final Object right) {
174:                    final Object value = context.extractor.getValue(
175:                            workingMemory, right);
176:                    if (((ObjectVariableContextEntry) context).left == null) {
177:                        return value != null;
178:                    }
179:                    return !((ObjectVariableContextEntry) context).left
180:                            .equals(value);
181:                }
182:
183:                public boolean evaluate(InternalWorkingMemory workingMemory,
184:                        final Extractor extractor1, final Object object1,
185:                        final Extractor extractor2, final Object object2) {
186:                    final Object value1 = extractor1.getValue(workingMemory,
187:                            object1);
188:                    final Object value2 = extractor2.getValue(workingMemory,
189:                            object2);
190:                    if (value1 == null) {
191:                        return value2 != null;
192:                    }
193:                    return !value1.equals(value2);
194:                }
195:
196:                public String toString() {
197:                    return "String !=";
198:                }
199:            }
200:
201:            static class StringMatchesEvaluator extends BaseEvaluator {
202:                /**
203:                 * 
204:                 */
205:                private static final long serialVersionUID = 400L;
206:                public final static Evaluator INSTANCE = new StringMatchesEvaluator();
207:
208:                private StringMatchesEvaluator() {
209:                    super (ValueType.STRING_TYPE, Operator.MATCHES);
210:                }
211:
212:                public boolean evaluate(InternalWorkingMemory workingMemory,
213:                        final Extractor extractor, final Object object1,
214:                        final FieldValue object2) {
215:                    final String value1 = (String) extractor.getValue(
216:                            workingMemory, object1);
217:                    final String value2 = (String) object2.getValue();
218:                    if (value1 == null) {
219:                        return false;
220:                    }
221:                    return value1.matches(value2);
222:                }
223:
224:                public boolean evaluateCachedRight(
225:                        InternalWorkingMemory workingMemory,
226:                        final VariableContextEntry context, final Object left) {
227:                    final String value = (String) ((ObjectVariableContextEntry) context).right;
228:                    if (value == null) {
229:                        return false;
230:                    }
231:                    return value.matches((String) context.declaration
232:                            .getExtractor().getValue(workingMemory, left));
233:                }
234:
235:                public boolean evaluateCachedLeft(
236:                        InternalWorkingMemory workingMemory,
237:                        final VariableContextEntry context, final Object right) {
238:                    final String value = (String) context.extractor.getValue(
239:                            workingMemory, right);
240:                    if (value == null) {
241:                        return false;
242:                    }
243:                    return value
244:                            .matches((String) ((ObjectVariableContextEntry) context).left);
245:                }
246:
247:                public boolean evaluate(InternalWorkingMemory workingMemory,
248:                        final Extractor extractor1, final Object object1,
249:                        final Extractor extractor2, final Object object2) {
250:                    final Object value1 = extractor1.getValue(workingMemory,
251:                            object1);
252:                    final Object value2 = extractor2.getValue(workingMemory,
253:                            object2);
254:                    if (value1 == null) {
255:                        return false;
256:                    }
257:                    return ((String) value1).matches((String) value2);
258:                }
259:
260:                public String toString() {
261:                    return "String matches";
262:                }
263:            }
264:
265:            static class StringNotMatchesEvaluator extends BaseEvaluator {
266:                /**
267:                 * 
268:                 */
269:                private static final long serialVersionUID = 400L;
270:                public final static Evaluator INSTANCE = new StringNotMatchesEvaluator();
271:
272:                private StringNotMatchesEvaluator() {
273:                    super (ValueType.STRING_TYPE, Operator.NOT_MATCHES);
274:                }
275:
276:                public boolean evaluate(InternalWorkingMemory workingMemory,
277:                        final Extractor extractor, final Object object1,
278:                        final FieldValue object2) {
279:                    final String value1 = (String) extractor.getValue(
280:                            workingMemory, object1);
281:                    final String value2 = (String) object2.getValue();
282:                    if (value1 == null) {
283:                        return false;
284:                    }
285:                    return !value1.matches(value2);
286:                }
287:
288:                public boolean evaluateCachedRight(
289:                        InternalWorkingMemory workingMemory,
290:                        final VariableContextEntry context, final Object left) {
291:                    final String value = (String) ((ObjectVariableContextEntry) context).right;
292:                    if (value == null) {
293:                        return false;
294:                    }
295:                    return !value.matches((String) context.declaration
296:                            .getExtractor().getValue(workingMemory, left));
297:                }
298:
299:                public boolean evaluateCachedLeft(
300:                        InternalWorkingMemory workingMemory,
301:                        final VariableContextEntry context, final Object right) {
302:                    final String value = (String) context.extractor.getValue(
303:                            workingMemory, right);
304:                    if (value == null) {
305:                        return false;
306:                    }
307:                    return !value
308:                            .matches((String) ((ObjectVariableContextEntry) context).left);
309:                }
310:
311:                public boolean evaluate(InternalWorkingMemory workingMemory,
312:                        final Extractor extractor1, final Object object1,
313:                        final Extractor extractor2, final Object object2) {
314:                    final Object value1 = extractor1.getValue(workingMemory,
315:                            object1);
316:                    final Object value2 = extractor2.getValue(workingMemory,
317:                            object2);
318:                    if (value1 == null) {
319:                        return false;
320:                    }
321:                    return !((String) value1).matches((String) value2);
322:                }
323:
324:                public String toString() {
325:                    return "String not matches";
326:                }
327:            }
328:
329:            static class StringMemberOfEvaluator extends BaseMemberOfEvaluator {
330:
331:                private static final long serialVersionUID = 400L;
332:                public final static Evaluator INSTANCE = new StringMemberOfEvaluator();
333:
334:                private StringMemberOfEvaluator() {
335:                    super (ValueType.STRING_TYPE, Operator.MEMBEROF);
336:                }
337:
338:                public String toString() {
339:                    return "String memberOf";
340:                }
341:            }
342:
343:            static class StringNotMemberOfEvaluator extends
344:                    BaseNotMemberOfEvaluator {
345:
346:                private static final long serialVersionUID = 400L;
347:                public final static Evaluator INSTANCE = new StringNotMemberOfEvaluator();
348:
349:                private StringNotMemberOfEvaluator() {
350:                    super (ValueType.STRING_TYPE, Operator.NOTMEMBEROF);
351:                }
352:
353:                public String toString() {
354:                    return "String not memberOf";
355:                }
356:            }
357:
358:        }
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