Source Code Cross Referenced for XMLAdapter4KnowledgeBases2.java in  » Rule-Engine » Mandarax » org » mandarax » xkb » framework » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Rule Engine » Mandarax » org.mandarax.xkb.framework 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.mandarax.xkb.framework;
002:
003:        /**
004:         *  Copyright (C) 1999-2004  Jens Dietrich (mailto:mandarax@jbdietrich.com)
005:         *
006:         *  This library is free software; you can redistribute it and/or
007:         *  modify it under the terms of the GNU Lesser General Public
008:         *  License as published by the Free Software Foundation; either
009:         *  version 2 of the License, or (at your option) any later version.
010:         *
011:         *  This library is distributed in the hope that it will be useful,
012:         *  but WITHOUT ANY WARRANTY; without even the implied warranty of
013:         *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014:         *  Lesser General Public License for more details.
015:         *
016:         *  You should have received a copy of the GNU Lesser General Public
017:         *  License along with this library; if not, write to the Free Software
018:         *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
019:         */
020:
021:        import java.io.PrintWriter;
022:        import java.util.Comparator;
023:        import java.util.Iterator;
024:        import java.util.List;
025:        import java.util.Map;
026:
027:        import org.jdom.Comment;
028:        import org.jdom.Element;
029:        import org.mandarax.kernel.ClauseSet;
030:        import org.mandarax.kernel.ExtendedKnowledgeBase;
031:        import org.mandarax.kernel.Fact;
032:        import org.mandarax.kernel.KnowledgeBase;
033:        import org.mandarax.kernel.LogicFactory;
034:        import org.mandarax.kernel.Query;
035:        import org.mandarax.kernel.Rule;
036:        import org.mandarax.sql.SQLClauseSet;
037:        import org.mandarax.xkb.XKBException;
038:
039:        /**
040:         * An adapter class for knowledge bases. Supports comparators.
041:         * @see org.mandarax.kernel.KnowledgeBase
042:         * @author <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</A>
043:         * @version 3.4 <7 March 05>
044:         * @since 2.1 
045:         * @deprecated from v 3.4 - support for new features such as validation will not be added to XKB, please use ZKB instead
046:         */
047:
048:        public class XMLAdapter4KnowledgeBases2 extends AbstractXMLAdapter {
049:            public static final String KNOWLEDGE_BASE = "knowledge_base";
050:
051:            /**
052:             * Export an object, i.e., convert it to an element in the DOM.
053:             * @param obj an object
054:             * @param driver the generic driver
055:             * @param cache a cache used in order to associate the same
056:             * id with various occurences of the same object
057:             * @exception an XKBException is thrown if export fails
058:             */
059:            public Element exportObject(Object obj, GenericDriver driver,
060:                    Map cache) throws XKBException {
061:                check(obj, KnowledgeBase.class);
062:                int ftl = driver.getFaultToleranceLevel();
063:                PrintWriter out = driver.getLogWriter();
064:                KnowledgeBase kb = (KnowledgeBase) obj;
065:                Element e = new Element(KNOWLEDGE_BASE);
066:                List clauseSets = kb.getClauseSets();
067:
068:                // export comparator
069:                Comparator comp = null;
070:                if (kb instanceof  ExtendedKnowledgeBase
071:                        && (comp = ((ExtendedKnowledgeBase) kb).getComparator()) != null) {
072:                    Element eComp = exportObject(comp,
073:                            GenericDriver.COMPARATOR, driver, cache);
074:                    e.addContent(eComp);
075:                }
076:
077:                // export knowledge
078:                for (Iterator it = clauseSets.iterator(); it.hasNext();) {
079:                    ClauseSet cs = (ClauseSet) it.next();
080:                    String kindOfObject = getClauseSetType(cs);
081:                    if (kindOfObject == null) {
082:                        String msg = "Cannot figure out what kind of clause set the following object is: "
083:                                + cs;
084:                        if (ftl == GenericDriver.LOW_FAULT_TOLERANCE)
085:                            throw new XKBException(msg);
086:                        // do nothing if (ftd==driver.HIGH_FAULT_TOLERANCE)
087:                        else {
088:                            out.println("Warning");
089:                            out.println(msg);
090:                            out.println("The clause is ignored");
091:                            LOG_XKB.warn(msg);
092:                            LOG_XKB.warn("The clause is ignored");
093:                        }
094:                    } else {
095:                        try {
096:                            Element el = exportObject(cs, kindOfObject, driver,
097:                                    cache);
098:                            e.addContent(el);
099:                        } catch (XKBException x) {
100:                            String msg = "Problems exporting the knowledge base, export failed for "
101:                                    + cs;
102:                            if (ftl == GenericDriver.LOW_FAULT_TOLERANCE)
103:                                throw new XKBException(msg);
104:                            // do nothing if (ftd==driver.HIGH_FAULT_TOLERANCE)
105:                            else {
106:                                out.println(msg);
107:                                out.println("See log for details");
108:                                e.addContent(new Comment(msg));
109:                                LOG_XKB.error(msg, x);
110:                            }
111:                        }
112:
113:                    }
114:                }
115:                // export queries
116:                for (Iterator it = kb.queryNames(); it.hasNext();) {
117:                    Query q = kb.getQuery((String) it.next());
118:                    try {
119:                        Element el = exportObject(q, GenericDriver.QUERY,
120:                                driver, cache);
121:                        e.addContent(el);
122:                    } catch (XKBException x) {
123:                        String msg = "Problems exporting the knowledge base, export failed for query "
124:                                + q;
125:                        if (ftl == GenericDriver.LOW_FAULT_TOLERANCE)
126:                            throw new XKBException(msg);
127:                        // do nothing if (ftd==driver.HIGH_FAULT_TOLERANCE)
128:                        else {
129:                            out.println(msg);
130:                            out.println("See log for details");
131:                            e.addContent(new Comment(msg));
132:                            LOG_XKB.error(msg, x);
133:                        }
134:                    }
135:                }
136:                return e;
137:            }
138:
139:            /**
140:             * Get the type of clause set, e.g. GenericDriver.FACT or GenericDriver.RULE.
141:             * @param cs a clause set
142:             * @return a string
143:             */
144:            protected String getClauseSetType(ClauseSet cs) {
145:                if (cs instanceof  Rule)
146:                    return GenericDriver.RULE;
147:                if (cs instanceof  Fact)
148:                    return GenericDriver.FACT;
149:                if (cs instanceof  SQLClauseSet)
150:                    return GenericDriver.SQL_CLAUSE_SET;
151:                return null;
152:            }
153:
154:            /**
155:             * Build an object from an XML element.
156:             * @param e an element
157:             * @param driver the generic driver
158:             * @param cache a cache used to identify objects that have the same id
159:             * @param lfactory the logic factory used to create objects
160:             * @exception an XKBException is thrown if export fails
161:             */
162:            public Object importObject(Element e, GenericDriver driver,
163:                    Map cache, LogicFactory lfactory) throws XKBException {
164:                KnowledgeBase kb = new org.mandarax.reference.AdvancedKnowledgeBase();
165:                int ftl = driver.getFaultToleranceLevel();
166:                PrintWriter out = driver.getLogWriter();
167:                List children = e.getChildren();
168:                for (Iterator it = children.iterator(); it.hasNext();) {
169:                    Element child = (Element) it.next();
170:
171:                    if (child.getName().equals(GenericDriver.COMPARATOR)) {
172:                        try {
173:                            Object obj = driver.getAdapterByTagName(
174:                                    GenericDriver.COMPARATOR).importObject(
175:                                    child, driver, cache, lfactory);
176:                            if (obj != null)
177:                                ((ExtendedKnowledgeBase) kb)
178:                                        .setComparator((Comparator) obj);
179:                        } catch (XKBException x) {
180:                            String msg = "Problems importing the comparator, root cause: "
181:                                    + x.getMessage();
182:                            if (ftl == GenericDriver.LOW_FAULT_TOLERANCE)
183:                                throw new XKBException(msg);
184:                            // do nothing if (ftd==driver.HIGH_FAULT_TOLERANCE)
185:                            else {
186:                                out.println(msg);
187:                                out.println("See log for details");
188:                                LOG_XKB.error(msg, x);
189:                            }
190:                        }
191:                    } else {
192:                        XMLAdapter adapter = driver.getAdapterByTagName(child
193:                                .getName());
194:                        try {
195:                            Object obj = adapter.importObject(child, driver,
196:                                    cache, lfactory);
197:                            if (obj instanceof  ClauseSet)
198:                                kb.add((ClauseSet) obj);
199:                            else if (obj instanceof  Query)
200:                                kb.addQuery((Query) obj);
201:                            else
202:                                throw new XKBException(
203:                                        "Can only import clause sets and queries into repository, import for object failed: "
204:                                                + obj);
205:                        } catch (XKBException x) {
206:                            String msg = "Problems importing the knowledge base, root cause: "
207:                                    + x.getMessage();
208:                            if (ftl == GenericDriver.LOW_FAULT_TOLERANCE)
209:                                throw new XKBException(msg);
210:                            // do nothing if (ftd==driver.HIGH_FAULT_TOLERANCE)
211:                            else {
212:                                out.println(msg);
213:                                out.println("See log for details");
214:                                LOG_XKB.error(msg, x);
215:                            }
216:                        }
217:                    }
218:                }
219:                return kb;
220:            }
221:
222:            /**
223:             * Get the name of the associated tag (element).
224:             * @return a string
225:             */
226:            public String getTagName() {
227:                return KNOWLEDGE_BASE;
228:            }
229:
230:            /**
231:             * Get the kind of object the adapter can export/import.
232:             * @return a string
233:             */
234:            public String getKindOfObject() {
235:                return GenericDriver.KNOWLEDGE_BASE;
236:            }
237:        }
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