Source Code Cross Referenced for VariableRestriction.java in  » Rule-Engine » drolls-Rule-Engine » org » drools » rule » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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


001:        package org.drools.rule;
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 java.util.Arrays;
020:
021:        import org.drools.base.evaluators.Operator;
022:        import org.drools.common.InternalFactHandle;
023:        import org.drools.common.InternalWorkingMemory;
024:        import org.drools.reteoo.ReteTuple;
025:        import org.drools.spi.Evaluator;
026:        import org.drools.spi.Extractor;
027:        import org.drools.spi.FieldExtractor;
028:        import org.drools.spi.Restriction;
029:
030:        public class VariableRestriction implements  Restriction {
031:
032:            private static final long serialVersionUID = 400L;
033:
034:            private final Declaration declaration;
035:
036:            private final Declaration[] requiredDeclarations;
037:
038:            private final Evaluator evaluator;
039:
040:            private final VariableContextEntry contextEntry;
041:
042:            public VariableRestriction(final FieldExtractor fieldExtractor,
043:                    final Declaration declaration, final Evaluator evaluator) {
044:                this .declaration = declaration;
045:                this .requiredDeclarations = new Declaration[] { declaration };
046:                this .evaluator = evaluator;
047:                this .contextEntry = this .createContextEntry(this .evaluator,
048:                        fieldExtractor);
049:            }
050:
051:            public Declaration[] getRequiredDeclarations() {
052:                return this .requiredDeclarations;
053:            }
054:
055:            public Evaluator getEvaluator() {
056:                return this .evaluator;
057:            }
058:
059:            public boolean isAllowed(final Extractor extractor,
060:                    final Object object,
061:                    final InternalWorkingMemory workingMemory) {
062:                return this .evaluator.evaluate(workingMemory,
063:                        this .contextEntry.extractor, object,
064:                        this .contextEntry.declaration.getExtractor(), object);
065:            }
066:
067:            public boolean isAllowedCachedLeft(final ContextEntry context,
068:                    final Object object) {
069:                return this .evaluator.evaluateCachedLeft(
070:                        ((VariableContextEntry) context).workingMemory,
071:                        (VariableContextEntry) context, object);
072:            }
073:
074:            public boolean isAllowedCachedRight(final ReteTuple tuple,
075:                    final ContextEntry context) {
076:                return this .evaluator.evaluateCachedRight(
077:                        ((VariableContextEntry) context).workingMemory,
078:                        (VariableContextEntry) context, tuple.get(
079:                                this .declaration).getObject());
080:            }
081:
082:            public String toString() {
083:                return "[VariableRestriction declaration=" + this .declaration
084:                        + "]";
085:            }
086:
087:            /* (non-Javadoc)
088:             * @see java.lang.Object#hashCode()
089:             */
090:            public int hashCode() {
091:                final int PRIME = 31;
092:                int result = 1;
093:                result = PRIME
094:                        * result
095:                        + ((this .declaration == null) ? 0 : this .declaration
096:                                .hashCode());
097:                result = PRIME
098:                        * result
099:                        + ((this .evaluator == null) ? 0 : this .evaluator
100:                                .hashCode());
101:                result = PRIME * result
102:                        + this .requiredDeclarations[0].hashCode();
103:                return result;
104:            }
105:
106:            public boolean equals(final Object object) {
107:                if (this  == object) {
108:                    return true;
109:                }
110:
111:                if (object == null || getClass() != object.getClass()) {
112:                    return false;
113:                }
114:
115:                final VariableRestriction other = (VariableRestriction) object;
116:
117:                return this .declaration.equals(other.declaration)
118:                        && this .evaluator.equals(other.evaluator)
119:                        && Arrays.equals(this .requiredDeclarations,
120:                                other.requiredDeclarations);
121:            }
122:
123:            private final VariableContextEntry createContextEntry(
124:                    final Evaluator eval, final FieldExtractor fieldExtractor) {
125:                if (Operator.MEMBEROF.equals(eval.getOperator())
126:                        || Operator.NOTMEMBEROF.equals(eval.getOperator())) {
127:                    return new ObjectVariableContextEntry(fieldExtractor,
128:                            this .declaration);
129:                } else {
130:                    if (fieldExtractor.getValueType().isBoolean()) {
131:                        return new BooleanVariableContextEntry(fieldExtractor,
132:                                this .declaration);
133:                    } else if (fieldExtractor.getValueType().isFloatNumber()) {
134:                        return new DoubleVariableContextEntry(fieldExtractor,
135:                                this .declaration);
136:                    } else if (fieldExtractor.getValueType().isIntegerNumber()) {
137:                        return new LongVariableContextEntry(fieldExtractor,
138:                                this .declaration);
139:                    } else if (fieldExtractor.getValueType().isChar()) {
140:                        return new CharVariableContextEntry(fieldExtractor,
141:                                this .declaration);
142:                    } else {
143:                        return new ObjectVariableContextEntry(fieldExtractor,
144:                                this .declaration);
145:                    }
146:                }
147:            }
148:
149:            public ContextEntry getContextEntry() {
150:                return this .contextEntry;
151:            }
152:
153:            public static abstract class VariableContextEntry implements 
154:                    ContextEntry {
155:                public FieldExtractor extractor;
156:                public Object object;
157:                public Declaration declaration;
158:                public ReteTuple reteTuple;
159:                public ContextEntry entry;
160:                public boolean leftNull;
161:                public boolean rightNull;
162:                public InternalWorkingMemory workingMemory;
163:
164:                public VariableContextEntry(final FieldExtractor extractor,
165:                        final Declaration declaration) {
166:                    this .extractor = extractor;
167:                    this .declaration = declaration;
168:                }
169:
170:                public ContextEntry getNext() {
171:                    return this .entry;
172:                }
173:
174:                public void setNext(final ContextEntry entry) {
175:                    this .entry = entry;
176:                }
177:
178:                public FieldExtractor getFieldExtractor() {
179:                    return this .extractor;
180:                }
181:
182:                public Object getObject() {
183:                    return this .object;
184:                }
185:
186:                public ReteTuple getTuple() {
187:                    return this .reteTuple;
188:                }
189:
190:                public Declaration getVariableDeclaration() {
191:                    return this .declaration;
192:                }
193:
194:                public boolean isLeftNull() {
195:                    return this .leftNull;
196:                }
197:
198:                public boolean isRightNull() {
199:                    return this .rightNull;
200:                }
201:            }
202:
203:            public static class ObjectVariableContextEntry extends
204:                    VariableContextEntry {
205:
206:                private static final long serialVersionUID = 400L;
207:                public Object left;
208:                public Object right;
209:
210:                public ObjectVariableContextEntry(
211:                        final FieldExtractor extractor,
212:                        final Declaration declaration) {
213:                    super (extractor, declaration);
214:                }
215:
216:                public void updateFromTuple(
217:                        final InternalWorkingMemory workingMemory,
218:                        final ReteTuple tuple) {
219:                    this .reteTuple = tuple;
220:                    this .workingMemory = workingMemory;
221:                    this .leftNull = this .declaration.getExtractor()
222:                            .isNullValue(workingMemory,
223:                                    tuple.get(this .declaration).getObject());
224:                    this .left = this .declaration.getExtractor().getValue(
225:                            workingMemory,
226:                            tuple.get(this .declaration).getObject());
227:                }
228:
229:                public void updateFromFactHandle(
230:                        final InternalWorkingMemory workingMemory,
231:                        final InternalFactHandle handle) {
232:                    this .object = handle.getObject();
233:                    this .workingMemory = workingMemory;
234:                    this .rightNull = this .extractor.isNullValue(workingMemory,
235:                            handle.getObject());
236:                    this .right = this .extractor.getValue(workingMemory, handle
237:                            .getObject());
238:                }
239:            }
240:
241:            public static class LongVariableContextEntry extends
242:                    VariableContextEntry {
243:
244:                private static final long serialVersionUID = 400L;
245:
246:                public long left;
247:                public long right;
248:
249:                public LongVariableContextEntry(final FieldExtractor extractor,
250:                        final Declaration declaration) {
251:                    super (extractor, declaration);
252:                }
253:
254:                public void updateFromTuple(
255:                        final InternalWorkingMemory workingMemory,
256:                        final ReteTuple tuple) {
257:                    this .reteTuple = tuple;
258:                    this .workingMemory = workingMemory;
259:                    this .leftNull = this .declaration.getExtractor()
260:                            .isNullValue(workingMemory,
261:                                    tuple.get(this .declaration).getObject());
262:
263:                    if (!leftNull) {
264:                        this .left = this .declaration
265:                                .getExtractor()
266:                                .getLongValue(workingMemory,
267:                                        tuple.get(this .declaration).getObject());
268:                    } else {
269:                        this .left = 0;
270:                    }
271:                }
272:
273:                public void updateFromFactHandle(
274:                        final InternalWorkingMemory workingMemory,
275:                        final InternalFactHandle handle) {
276:                    this .object = handle.getObject();
277:                    this .workingMemory = workingMemory;
278:                    this .rightNull = this .extractor.isNullValue(workingMemory,
279:                            handle.getObject());
280:
281:                    if (!rightNull) { // avoid a NullPointerException
282:                        this .right = this .extractor.getLongValue(workingMemory,
283:                                handle.getObject());
284:                    } else {
285:                        this .right = 0;
286:                    }
287:                }
288:            }
289:
290:            public static class CharVariableContextEntry extends
291:                    VariableContextEntry {
292:
293:                private static final long serialVersionUID = 400L;
294:
295:                public char left;
296:                public char right;
297:
298:                public CharVariableContextEntry(final FieldExtractor extractor,
299:                        final Declaration declaration) {
300:                    super (extractor, declaration);
301:                }
302:
303:                public void updateFromTuple(
304:                        final InternalWorkingMemory workingMemory,
305:                        final ReteTuple tuple) {
306:                    this .reteTuple = tuple;
307:                    this .workingMemory = workingMemory;
308:                    this .leftNull = this .declaration.getExtractor()
309:                            .isNullValue(workingMemory,
310:                                    tuple.get(this .declaration).getObject());
311:
312:                    if (!leftNull) {
313:                        this .left = this .declaration
314:                                .getExtractor()
315:                                .getCharValue(workingMemory,
316:                                        tuple.get(this .declaration).getObject());
317:                    } else {
318:                        this .left = 0;
319:                    }
320:                }
321:
322:                public void updateFromFactHandle(
323:                        final InternalWorkingMemory workingMemory,
324:                        final InternalFactHandle handle) {
325:                    this .object = handle.getObject();
326:                    this .workingMemory = workingMemory;
327:                    this .rightNull = this .extractor.isNullValue(workingMemory,
328:                            handle.getObject());
329:
330:                    if (!rightNull) { // avoid a NullPointerException
331:                        this .right = this .extractor.getCharValue(workingMemory,
332:                                handle.getObject());
333:                    } else {
334:                        this .right = 0;
335:                    }
336:                }
337:            }
338:
339:            public static class DoubleVariableContextEntry extends
340:                    VariableContextEntry {
341:
342:                private static final long serialVersionUID = 400L;
343:
344:                public double left;
345:                public double right;
346:
347:                public DoubleVariableContextEntry(
348:                        final FieldExtractor extractor,
349:                        final Declaration declaration) {
350:                    super (extractor, declaration);
351:                }
352:
353:                public void updateFromTuple(
354:                        final InternalWorkingMemory workingMemory,
355:                        final ReteTuple tuple) {
356:                    this .reteTuple = tuple;
357:                    this .workingMemory = workingMemory;
358:                    this .leftNull = this .declaration.getExtractor()
359:                            .isNullValue(workingMemory,
360:                                    tuple.get(this .declaration).getObject());
361:
362:                    if (!leftNull) {
363:                        this .left = this .declaration
364:                                .getExtractor()
365:                                .getDoubleValue(workingMemory,
366:                                        tuple.get(this .declaration).getObject());
367:                    } else {
368:                        this .left = 0;
369:                    }
370:                }
371:
372:                public void updateFromFactHandle(
373:                        final InternalWorkingMemory workingMemory,
374:                        final InternalFactHandle handle) {
375:                    this .object = handle.getObject();
376:                    this .workingMemory = workingMemory;
377:                    this .rightNull = this .extractor.isNullValue(workingMemory,
378:                            handle.getObject());
379:
380:                    if (!rightNull) { // avoid a NullPointerException
381:                        this .right = this .extractor.getDoubleValue(
382:                                workingMemory, handle.getObject());
383:                    } else {
384:                        this .right = 0;
385:                    }
386:                }
387:            }
388:
389:            public static class BooleanVariableContextEntry extends
390:                    VariableContextEntry {
391:
392:                private static final long serialVersionUID = 400L;
393:                public boolean left;
394:                public boolean right;
395:
396:                public BooleanVariableContextEntry(
397:                        final FieldExtractor extractor,
398:                        final Declaration declaration) {
399:                    super (extractor, declaration);
400:                }
401:
402:                public void updateFromTuple(
403:                        final InternalWorkingMemory workingMemory,
404:                        final ReteTuple tuple) {
405:                    this .reteTuple = tuple;
406:                    this .workingMemory = workingMemory;
407:                    this .leftNull = this .declaration.getExtractor()
408:                            .isNullValue(workingMemory,
409:                                    tuple.get(this .declaration).getObject());
410:
411:                    if (!leftNull) {
412:                        this .left = this .declaration
413:                                .getExtractor()
414:                                .getBooleanValue(workingMemory,
415:                                        tuple.get(this .declaration).getObject());
416:                    } else {
417:                        this .left = false;
418:                    }
419:                }
420:
421:                public void updateFromFactHandle(
422:                        final InternalWorkingMemory workingMemory,
423:                        final InternalFactHandle handle) {
424:                    this .object = handle.getObject();
425:                    this .workingMemory = workingMemory;
426:                    this .rightNull = this .extractor.isNullValue(workingMemory,
427:                            handle.getObject());
428:
429:                    if (!rightNull) { // avoid a NullPointerException
430:                        this .right = this .extractor.getBooleanValue(
431:                                workingMemory, handle.getObject());
432:                    } else {
433:                        this .right = false;
434:                    }
435:                }
436:            }
437:        }
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