Source Code Cross Referenced for DrlDumper.java in  » Rule-Engine » drolls-Rule-Engine » org » drools » lang » 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.lang 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.drools.lang;
002:
003:        /*
004:         * Author Jayaram C S
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.Iterator;
020:        import java.util.List;
021:
022:        import org.drools.lang.descr.AccumulateDescr;
023:        import org.drools.lang.descr.AndDescr;
024:        import org.drools.lang.descr.AttributeDescr;
025:        import org.drools.lang.descr.CollectDescr;
026:        import org.drools.lang.descr.EvalDescr;
027:        import org.drools.lang.descr.ExistsDescr;
028:        import org.drools.lang.descr.FieldBindingDescr;
029:        import org.drools.lang.descr.FieldConstraintDescr;
030:        import org.drools.lang.descr.ForallDescr;
031:        import org.drools.lang.descr.FromDescr;
032:        import org.drools.lang.descr.FunctionDescr;
033:        import org.drools.lang.descr.GlobalDescr;
034:        import org.drools.lang.descr.ImportDescr;
035:        import org.drools.lang.descr.LiteralRestrictionDescr;
036:        import org.drools.lang.descr.NotDescr;
037:        import org.drools.lang.descr.OrDescr;
038:        import org.drools.lang.descr.PackageDescr;
039:        import org.drools.lang.descr.PackageDescrDumper;
040:        import org.drools.lang.descr.PatternDescr;
041:        import org.drools.lang.descr.PredicateDescr;
042:        import org.drools.lang.descr.QualifiedIdentifierRestrictionDescr;
043:        import org.drools.lang.descr.QueryDescr;
044:        import org.drools.lang.descr.RestrictionConnectiveDescr;
045:        import org.drools.lang.descr.ReturnValueRestrictionDescr;
046:        import org.drools.lang.descr.RuleDescr;
047:        import org.drools.lang.descr.VariableRestrictionDescr;
048:        import org.drools.util.ReflectiveVisitor;
049:
050:        /**
051:         * 
052:         * @author <a href="mailto:jayaramcs@gmail.com">Author Jayaram C S</a>
053:         *
054:         */
055:        public class DrlDumper extends ReflectiveVisitor implements 
056:                PackageDescrDumper {
057:
058:            private StringBuffer drlDump;
059:            private static final String eol = System
060:                    .getProperty("line.separator");
061:            private String template;
062:            private boolean needsBracket = false;
063:
064:            public synchronized String dump(final PackageDescr packageDescr) {
065:                this .drlDump = new StringBuffer();
066:                visitPackageDescr(packageDescr);
067:                return this .drlDump.toString();
068:            }
069:
070:            public String getTemplate() {
071:                return this .template;
072:            }
073:
074:            public void visitAndDescr(final AndDescr descr) {
075:                this .template = new String();
076:                if (!descr.getDescrs().isEmpty()) {
077:                    this .template = processDescrList(descr.getDescrs());
078:                } else {
079:                    this .template = "";
080:                }
081:            }
082:
083:            public void visitAttributeDescr(final AttributeDescr attributeDescr) {
084:                this .template = new String();
085:                final String name = attributeDescr.getName();
086:                String value = null;
087:                if (name.equals("agenda-group")
088:                        || name.equals("activation-group")
089:                        || name.equals("ruleflow-group")) {
090:                    // These attributes may need quotes around them, if they have spaces, so add anyway
091:                    value = "\"" + attributeDescr.getValue() + "\"";
092:                } else {
093:                    value = attributeDescr.getValue();
094:                }
095:                this .template = "\t " + name + " " + value + DrlDumper.eol;
096:            }
097:
098:            public void visitFieldConstraintDescr(
099:                    final FieldConstraintDescr descr) {
100:                if (!descr.getRestrictions().isEmpty()) {
101:                    this .template = descr.getFieldName()
102:                            + " "
103:                            + processFieldConstraint(descr.getRestriction(),
104:                                    false);
105:                }
106:            }
107:
108:            public void visitVariableRestrictionDescr(
109:                    final VariableRestrictionDescr descr) {
110:                this .template = new String();
111:                this .template = descr.getEvaluator() + " "
112:                        + descr.getIdentifier();
113:            }
114:
115:            public void visitPatternDescr(final PatternDescr descr) {
116:                StringBuffer buf = new StringBuffer();
117:                buf.append("\t\t");
118:                if (descr.getIdentifier() != null) {
119:                    buf.append(descr.getIdentifier());
120:                    buf.append(" : ");
121:
122:                }
123:                buf.append(descr.getObjectType());
124:                buf.append("( ");
125:                if (!descr.getConstraint().getDescrs().isEmpty()) {
126:                    buf.append(processColoumnConstraintList(descr
127:                            .getConstraint().getDescrs()));
128:                }
129:                buf.append(" )");
130:                if (descr.getSource() != null) {
131:                    buf.append(" from ");
132:                    this .template = buf.toString();
133:                    visit(descr.getSource());
134:                    buf.append(this .template);
135:                }
136:                this .template = buf.toString();
137:            }
138:
139:            public void visitEvalDescr(final EvalDescr descr) {
140:                this .template = new String();
141:                this .template = "\t\teval ( " + descr.getContent() + " )"
142:                        + DrlDumper.eol;
143:            }
144:
145:            public void visitExistsDescr(final ExistsDescr descr) {
146:                this .template = new String();
147:                if (!descr.getDescrs().isEmpty()) {
148:                    this .template = "\t\texists "
149:                            + processDescrList(descr.getDescrs()) + ";";
150:                } else {
151:                    this .template = "";
152:                }
153:            }
154:
155:            public void visitCollectDescr(final CollectDescr descr) {
156:                String tmpstr = new String();
157:                tmpstr += " collect (";
158:                visitPatternDescr(descr.getInputPattern());
159:                tmpstr += this .template.substring(2);
160:                this .template = tmpstr + ");";
161:            }
162:
163:            public void visitAccumulateDescr(final AccumulateDescr descr) {
164:                String tmpstr = new String();
165:                tmpstr += " accumulate (";
166:                visitPatternDescr(descr.getInputPattern());
167:                tmpstr += this .template.substring(2);
168:
169:                if (descr.isExternalFunction()) {
170:                    tmpstr += "," + descr.getFunctionIdentifier() + "("
171:                            + descr.getExpression() + ")";
172:                } else {
173:                    tmpstr += ", init(" + descr.getInitCode() + "), ";
174:                    tmpstr += "action(" + descr.getActionCode() + "), ";
175:                    if (descr.getReverseCode() != null) {
176:                        tmpstr += " reverse(" + descr.getReverseCode() + "), ";
177:                    }
178:                    tmpstr += "result(" + descr.getResultCode() + ")";
179:                }
180:                this .template = tmpstr + ");";
181:            }
182:
183:            public void visitFromDescr(final FromDescr descr) {
184:                this .template = descr.getDataSource().toString();
185:            }
186:
187:            public void visitForallDescr(final ForallDescr descr) {
188:                String localstr = new String();
189:                localstr += "\t\tforall ( ";
190:                localstr += DrlDumper.eol;
191:
192:                for (final Iterator ite = descr.getDescrs().iterator(); ite
193:                        .hasNext();) {
194:                    Object obj = ite.next();
195:                    visit(obj);
196:                    localstr += this .template + DrlDumper.eol;
197:                }
198:
199:                this .template = localstr;
200:                this .template += "\t\t)";
201:                this .template += DrlDumper.eol;
202:            }
203:
204:            public void visitFieldBindingDescr(final FieldBindingDescr descr) {
205:                this .template = new String();
206:                this .template = descr.getIdentifier() + " : "
207:                        + descr.getFieldName();
208:            }
209:
210:            public void visitFunctionDescr(final FunctionDescr functionDescr) {
211:                this .template = new String();
212:                final String parameterTemplate = processParameters(
213:                        functionDescr.getParameterNames(), functionDescr
214:                                .getParameterTypes());
215:
216:                this .template = "function " + functionDescr.getReturnType()
217:                        + " " + functionDescr.getName() + "("
218:                        + parameterTemplate + "){" +
219:
220:                        functionDescr.getText() + DrlDumper.eol + "}"
221:                        + DrlDumper.eol;
222:
223:            }
224:
225:            public void visitLiteralRestrictionDescr(
226:                    final LiteralRestrictionDescr descr) {
227:                this .template = "";
228:                String text = descr.getText();
229:                if (text == null
230:                        || descr.getType() == LiteralRestrictionDescr.TYPE_NULL) {
231:                    text = "null";
232:                } else if (descr.getType() == LiteralRestrictionDescr.TYPE_NUMBER) {
233:                    try {
234:                        Integer.parseInt(text);
235:                    } catch (final NumberFormatException e) {
236:                        text = "\"" + text + "\"";
237:                    }
238:                } else if (descr.getType() == LiteralRestrictionDescr.TYPE_STRING) {
239:                    text = "\"" + text + "\"";
240:                }
241:                this .template = descr.getEvaluator() + " " + text;
242:            }
243:
244:            public void visitQualifiedIdentifierRestrictionDescr(
245:                    final QualifiedIdentifierRestrictionDescr descr) {
246:                this .template = descr.getEvaluator() + " " + descr.getText();
247:            }
248:
249:            public void visitRestrictionConnectiveDescr(
250:                    final RestrictionConnectiveDescr descr) {
251:                String tmp = this .processFieldConstraint(descr, true);
252:                this .template = tmp;
253:            }
254:
255:            public void visitNotDescr(final NotDescr descr) {
256:                this .template = new String();
257:                if (!descr.getDescrs().isEmpty()) {
258:                    this .template = "\t   not ( "
259:                            + processDescrList(descr.getDescrs()) + ")";
260:                } else {
261:                    this .template = "";
262:                }
263:            }
264:
265:            public void visitOrDescr(final OrDescr descr) {
266:                this .template = new String();
267:                if (!descr.getDescrs().isEmpty()) {
268:                    this .template = processOrDescrList(descr.getDescrs());
269:                } else {
270:                    this .template = " ";
271:                }
272:            }
273:
274:            public void visitPackageDescr(final PackageDescr packageDescr) {
275:                final String packageName = packageDescr.getName();
276:                final String xmlString = "package " + packageName + ";"
277:                        + DrlDumper.eol + DrlDumper.eol;
278:
279:                appendDrlDump(xmlString);
280:                if (packageDescr.getImports() != null) {
281:                    appendDrlDump(processImportsList(packageDescr.getImports()));
282:                }
283:                if (packageDescr.getGlobals() != null) {
284:                    appendDrlDump(processGlobalsList(packageDescr.getGlobals()));
285:                }
286:                if (packageDescr.getFunctions() != null) {
287:                    appendDrlDump(processFunctionsList(packageDescr
288:                            .getFunctions()));
289:                }
290:                if (packageDescr.getRules() != null) {
291:                    appendDrlDump(processRules(packageDescr.getRules()));
292:                }
293:
294:            }
295:
296:            public void visitPredicateDescr(final PredicateDescr descr) {
297:                this .template = new String();
298:                this .template = "eval( " + descr.getContent() + " )";
299:
300:            }
301:
302:            public void visitReturnValueRestrictionDescr(
303:                    final ReturnValueRestrictionDescr descr) {
304:                this .template = new String();
305:                this .template = descr.getEvaluator() + " ( "
306:                        + descr.getContent() + ")";
307:            }
308:
309:            public void visitQueryDescr(final QueryDescr descr) {
310:                this .template = new String();
311:                this .template = "query \"" + descr.getName() + "\""
312:                        + processDescrList(descr.getLhs().getDescrs()) + "end";
313:            }
314:
315:            private String processRules(final List rules) {
316:                String ruleList = "";
317:                Object ruleobj;
318:                for (final Iterator iterator = rules.iterator(); iterator
319:                        .hasNext();) {
320:                    ruleobj = iterator.next();
321:                    if (ruleobj instanceof  QueryDescr) {
322:                        visitQueryDescr((QueryDescr) ruleobj);
323:                        ruleList += this .template;
324:                        break;
325:                    }
326:
327:                    final RuleDescr ruleDescr = (RuleDescr) ruleobj;
328:                    String rule = "rule \"" + ruleDescr.getName() + "\" "
329:                            + DrlDumper.eol;
330:                    final String attribute = processAttribute(ruleDescr
331:                            .getAttributes());
332:                    String lhs = "";
333:                    if (!ruleDescr.getLhs().getDescrs().isEmpty()) {
334:                        lhs = "\t when"
335:                                + DrlDumper.eol
336:                                + processDescrList(ruleDescr.getLhs()
337:                                        .getDescrs()) + DrlDumper.eol;
338:                    } else {
339:
340:                        lhs = "\t when";
341:                    }
342:
343:                    String rhs = (String) ruleDescr.getConsequence();
344:                    if (rhs == null) {
345:                        rhs = "\t then" + DrlDumper.eol + "\t";
346:                    } else {
347:                        rhs = "\t then" + DrlDumper.eol
348:                                + ruleDescr.getConsequence();
349:                    }
350:
351:                    rule += attribute;
352:                    rule += lhs;
353:                    rule += rhs;
354:                    rule += "end" + DrlDumper.eol;
355:                    ruleList += rule;
356:                }
357:
358:                return ruleList + DrlDumper.eol;
359:            }
360:
361:            private String processOrDescrList(final List descr) {
362:                String descrString = "";
363:                for (final Iterator iterator = descr.iterator(); iterator
364:                        .hasNext();) {
365:                    visit(iterator.next());
366:                    descrString += this .template;
367:                    if (descrString.endsWith(DrlDumper.eol)) {
368:                        descrString = descrString.substring(0, descrString
369:                                .indexOf(DrlDumper.eol));
370:                    }
371:                    descrString += " || ";
372:                }
373:                return descrString.substring(0, descrString.length() - 4);
374:            }
375:
376:            private String processColoumnConstraintList(final List descr) {
377:                String descrString = "";
378:                Object previous = null;
379:                for (final Iterator iterator = descr.iterator(); iterator
380:                        .hasNext();) {
381:
382:                    final Object temp = iterator.next();
383:                    visit(temp);
384:
385:                    if (previous == null) {
386:                        descrString += this .template;
387:                    } else if (previous instanceof  FieldBindingDescr
388:                            && !(temp instanceof  FieldBindingDescr)
389:                            && !(temp instanceof  PredicateDescr)) {
390:                        final FieldConstraintDescr tempDescr = (FieldConstraintDescr) temp;
391:                        final FieldBindingDescr previousDescr = (FieldBindingDescr) previous;
392:                        if (tempDescr.getFieldName().equals(
393:                                previousDescr.getFieldName())) {
394:                            // as its a binding followed by a field constraint we need to remove 
395:                            // the extra field name                    
396:                            descrString += this .template.substring(tempDescr
397:                                    .getFieldName().length() + 1);
398:                        } else {
399:                            descrString += " , " + this .template;
400:                        }
401:                    } else {
402:                        descrString += " , " + this .template;
403:                    }
404:
405:                    previous = temp;
406:
407:                }
408:                return descrString.substring(0, descrString.length());
409:            }
410:
411:            private String processFieldConstraint(
412:                    final RestrictionConnectiveDescr restriction,
413:                    boolean addBrackets) {
414:                String descrString = "";
415:                String connective = "";
416:                boolean bracketTmp = this .needsBracket;
417:                this .needsBracket = restriction.getRestrictions().size() > 1;
418:
419:                if (restriction.getConnective() == RestrictionConnectiveDescr.OR) {
420:                    connective = " || ";
421:                } else {
422:                    connective = " && ";
423:                }
424:                if (addBrackets && bracketTmp) {
425:                    descrString += "( ";
426:                }
427:                for (final Iterator it = restriction.getRestrictions()
428:                        .iterator(); it.hasNext();) {
429:                    final Object temp = it.next();
430:                    visit(temp);
431:                    descrString += this .template;
432:                    if (it.hasNext()) {
433:                        descrString += connective;
434:                    }
435:                }
436:                if (addBrackets && bracketTmp) {
437:                    descrString += " )";
438:                }
439:                this .needsBracket = bracketTmp;
440:                return descrString;
441:            }
442:
443:            private String processDescrList(final List descr) {
444:                String descrString = "";
445:                for (final Iterator ite = descr.iterator(); ite.hasNext();) {
446:
447:                    Object obj = ite.next();
448:
449:                    visit(obj);
450:                    descrString += this .template;
451:
452:                    if (obj.getClass().equals(PatternDescr.class)
453:                            || obj.getClass().equals(CollectDescr.class)) {
454:                        descrString += DrlDumper.eol;
455:                    } else if (ite.hasNext()) {
456:                        descrString += " && ";
457:                    }
458:                }
459:                return descrString;
460:            }
461:
462:            private String processFunctionsList(final List functions) {
463:                String functionList = "";
464:
465:                for (final Iterator it = functions.iterator(); it.hasNext();) {
466:                    visit(it.next());
467:                    functionList += this .template;
468:                }
469:
470:                return functionList + DrlDumper.eol;
471:            }
472:
473:            private String processAttribute(final List attributes) {
474:
475:                String attributeList = "";
476:                for (final Iterator it = attributes.iterator(); it.hasNext();) {
477:                    final AttributeDescr attributeDescr = (AttributeDescr) it
478:                            .next();
479:                    visit(attributeDescr);
480:                    attributeList += this .template;
481:                }
482:                return attributeList;
483:            }
484:
485:            private String processParameters(final List parameterNames,
486:                    final List parameterTypes) {
487:                if (parameterNames.isEmpty()) {
488:                    return "";
489:                }
490:
491:                String paramList = "";
492:                int i = 0;
493:                for (final Iterator it = parameterNames.iterator(); it
494:                        .hasNext(); i++) {
495:                    final String paramName = (String) it.next();
496:                    final String paramType = (String) parameterTypes.get(i);
497:                    final String paramTemplate = paramType + " " + paramName
498:                            + ",";
499:                    paramList += paramTemplate;
500:                }
501:                paramList = paramList.substring(0, paramList.length() - 1);
502:                return paramList;
503:            }
504:
505:            private String processGlobalsList(final List globals) {
506:                String globalList = "";
507:
508:                for (final Iterator it = globals.iterator(); it.hasNext();) {
509:                    final GlobalDescr global = (GlobalDescr) it.next();
510:                    final String identifier = global.getIdentifier();
511:                    final String type = global.getType();
512:                    final String globalTemplate = "global " + type + " "
513:                            + identifier + ";" + DrlDumper.eol;
514:                    globalList += globalTemplate;
515:                }
516:
517:                return globalList + DrlDumper.eol;
518:            }
519:
520:            private String processImportsList(final List imports) {
521:                String importList = "";
522:
523:                for (final Iterator it = imports.iterator(); it.hasNext();) {
524:                    final String importString = ((ImportDescr) it.next())
525:                            .getTarget();
526:                    final String importTemplate = "import " + importString
527:                            + ";" + DrlDumper.eol;
528:                    importList += importTemplate;
529:                }
530:                return importList + DrlDumper.eol;
531:            }
532:
533:            private void appendDrlDump(final String temp) {
534:                this.drlDump.append(temp);
535:            }
536:
537:        }
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