Source Code Cross Referenced for UnnecessaryConstructorRule.java in  » Code-Analyzer » hammurapi-3.20.0.3 » org » hammurapi » inspectors » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Code Analyzer » hammurapi 3.20.0.3 » org.hammurapi.inspectors 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Hammurapi
003:         * Automated Java code review system. 
004:         * Copyright (C) 2004  Hammurapi Group
005:         *
006:         * This program is free software; you can redistribute it and/or modify
007:         * it under the terms of the GNU General Public License as published by
008:         * the Free Software Foundation; either version 2 of the License, or
009:         *  (at your option) any later version.
010:         *
011:         * This program 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
014:         * GNU General Public License for more details.
015:         *
016:         * You should have received a copy of the GNU General Public License
017:         * along with this program; if not, write to the Free Software
018:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
019:         *
020:         * URL: http://www.hammurapi.org
021:         * e-Mail: support@hammurapi.biz
022:         */
023:        package org.hammurapi.inspectors;
024:
025:        import org.hammurapi.InspectorBase;
026:        import org.hammurapi.HammurapiException;
027:
028:        import com.pavelvlasov.jsel.Constructor;
029:        import com.pavelvlasov.jsel.TypeDefinition;
030:        import com.pavelvlasov.jsel.statements.Statement;
031:        import com.pavelvlasov.jsel.statements.SuperConstructorCall;
032:        import com.pavelvlasov.util.AccumulatingVisitorExceptionSink;
033:        import com.pavelvlasov.util.DispatchingVisitor;
034:
035:        /**
036:         * @author Janos Czako
037:         * 
038:         * <description>Unnecessary constructor detects when a constructor is not
039:         * necessary; i.e., when there's only one constructor, it's public, has an
040:         * empty body, and takes no arguments. (PMD) </description>
041:         * 
042:         * Example:
043:         * 	public DaoX(){
044:         super();
045:         }
046:
047:         */
048:        public class UnnecessaryConstructorRule extends InspectorBase {
049:
050:            /**
051:             * The chained visitor class which searches after constructor definitions.
052:             */
053:            public static class ConstructorSnooper {
054:
055:                /**
056:                 * The list of the constructor definitions found.
057:                 */
058:                java.util.List constList = new java.util.ArrayList();
059:
060:                /**
061:                 * Reviews the constructor definitions and collects them.
062:                 * 
063:                 * @param constructor the constructor definition
064:                 */
065:                public void visit(Constructor constructor) {
066:                    constList.add(constructor);
067:                }
068:            }
069:
070:            /**
071:             * The error text for exceptions in the chained visitor.
072:             */
073:            private static final String CHAINED_ERRS = "There have been exceptions (see above)";
074:
075:            /**
076:             * Reviews the type definition if it violates against the rule.
077:             * 
078:             * @param element the type definition to be reviewed.
079:             * @throws HammurapiException in case of any exception in the chained visitor
080:             */
081:            public void visit(TypeDefinition element) throws HammurapiException {
082:                AccumulatingVisitorExceptionSink es = new AccumulatingVisitorExceptionSink();
083:                ConstructorSnooper rs = new ConstructorSnooper();
084:                element.accept(new DispatchingVisitor(rs, es));
085:
086:                if (rs.constList.size() == 1) {
087:                    Constructor constructor = (Constructor) rs.constList.get(0);
088:
089:                    checkConstructor(constructor);
090:                }
091:
092:                if (!es.getExceptions().isEmpty()) {
093:                    es.dump();
094:                    throw new HammurapiException(CHAINED_ERRS);
095:                }
096:            }
097:
098:            /**
099:             * "public" modifier of the constructor
100:             */
101:            private static final String PUBLIC = "public";
102:
103:            /**
104:             * Checks if the constructor violates against the rule.
105:             */
106:            private void checkConstructor(Constructor constructor) {
107:                if (constructor.getModifiers().contains(PUBLIC)
108:                        && constructor.getParameters().size() == 0) {
109:
110:                    if (isEmpty(constructor.getCompoundStatement())) {
111:                        context.reportViolation(constructor);
112:                    } else {
113:                        java.util.Iterator statements = constructor
114:                                .getCompoundStatement().getStatements()
115:                                .iterator();
116:                        int cntr = 0;
117:                        while (statements.hasNext()) {
118:                            Statement statement = (Statement) statements.next();
119:                            if (!(statement instanceof  SuperConstructorCall)) {
120:                                cntr++;
121:                            }
122:                        }
123:                        if (cntr == 0) {
124:                            context.reportViolation(constructor);
125:                        }
126:                    }
127:                }
128:            }
129:        }
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