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    1   /***
    2    * BSD-style license; for more info see http://pmd.sourceforge.net/license.html
    3    */
    4   package net.sourceforge.pmd.rules;
    5
    6   import net.sourceforge.pmd.AbstractRule;
    7   import net.sourceforge.pmd.ast.ASTAllocationExpression;
    8   import net.sourceforge.pmd.ast.ASTArguments;
    9   import net.sourceforge.pmd.ast.ASTArrayDimsAndInits;
    10  import net.sourceforge.pmd.ast.ASTClassOrInterfaceDeclaration;
    11  import net.sourceforge.pmd.ast.ASTClassOrInterfaceType;
    12  import net.sourceforge.pmd.ast.ASTCompilationUnit;
    13  import net.sourceforge.pmd.ast.ASTConstructorDeclaration;
    14  import net.sourceforge.pmd.ast.ASTEnumDeclaration;
    15
    16  import java.util.ArrayList;
    17  import java.util.Iterator;
    18  import java.util.List;
    19  import java.util.ListIterator;
    20
    21  /***
    22   * 1. Note all private constructors.
    23   * 2. Note all instantiations from outside of the class by way of the private
    24   * constructor.
    25   * 3. Flag instantiations.
    26   * <p/>
    27   * <p/>
    28   * Parameter types can not be matched because they can come as exposed members
    29   * of classes.  In this case we have no way to know what the type is.  We can
    30   * make a best effort though which can filter some?
    31   *
    32   * @author CL Gilbert (dnoyeb@users.sourceforge.net)
    33   * @author David Konecny (david.konecny@)
    34   */
    35  public class AccessorClassGeneration extends AbstractRule {
    36
    37      private List classDataList = new ArrayList();
    38      private int classID = -1;
    39      privateong> String packageName;
    40
    41      public Object visit(ASTEnumDeclaration node, Object data) {
    42          return data;  // just skip Enums
    43      }
    44
    45      public Object visit(ASTCompilationUnit node, Object data) {
    46          classDataList.clear();
    47          packageName = node.getScope().getEnclosingSourceFileScope().getPackageName();
    48          return super.visit(node, data);
    49      }
    50
    51      private static class ClassData {
    52          private String m_ClassName;
    53          private List m_PrivateConstructors;
    54          private List m_Instantiations;
    55          /***
    56           * List of outer class names that exist above this class
    57           */
    58          private List m_ClassQualifyingNames;
    59
    60          public ClassData(String className) {
    61              m_ClassName = className;
    62              m_PrivateConstructors = new ArrayList();
    63              m_Instantiations = new ArrayList();
    64              m_ClassQualifyingNames = new ArrayList();
    65          }
    66
    67          public void addInstantiation(AllocData ad) {
    68              m_Instantiations.add(ad);
    69          }
    70
    71          public Iterator getInstantiationIterator() {
    72              return m_Instantiations.iterator();
    73          }
    74
    75          public void addConstructor(ASTConstructorDeclaration cd) {
    76              m_PrivateConstructors.add(cd);
    77          }
    78
    79          public Iterator getPrivateConstructorIterator() {
    80              return m_PrivateConstructors.iterator();
    81          }
    82
    83          public String getClassName() {
    84              return m_ClassName;
    85          }
    86
    87          public void addClassQualifyingName(String name) {
    88              m_ClassQualifyingNames.add(name);
    89          }
    90
    91          public List getClassQualifyingNamesList() {
    92              return m_ClassQualifyingNames;
    93          }
    94      }
    95
    96      private static class AllocData {
    97          private String m_Name;
    98          private int m_ArgumentCount;
    99          private ASTAllocationExpression m_ASTAllocationExpression;
    100         private boolean isArray;
    101
    102         public AllocData(ASTAllocationExpression node, String aPackageName, List classQualifyingNames) {
    103             if (node.jjtGetChild(1) instanceof ASTArguments) {
    104                 ASTArguments aa = (ASTArguments) node.jjtGetChild(1);
    105                 m_ArgumentCount = aa.getArgumentCount();
    106                 //Get name and strip off all superfluous data
    107                 //strip off package name if it is current package
    108                 if (!(node.jjtGetChild(0) instanceof ASTClassOrInterfaceType)) {
    109                     throw new RuntimeException("BUG: Expected a ASTClassOrInterfaceType, got a " + node.jjtGetChild(0).getClass());
    110                 }
    111                 ASTClassOrInterfaceType an = (ASTClassOrInterfaceType) node.jjtGetChild(0);
    112                 m_Name = stripString(aPackageName + ".", an.getImage());
    113
    114                 //strip off outer class names
    115                 //try OuterClass, then try OuterClass.InnerClass, then try OuterClass.InnerClass.InnerClass2, etc...
    116                 String findName = "";
    117                 for (ListIterator li = classQualifyingNames.listIterator(classQualifyingNames.size()); li.hasPrevious();) {
    118                     String aName = (String) li.previous();
    119                     findName = aName + "." + findName;
    120                     if (m_Name.startsWith(findName)) {
    121                         //strip off name and exit
    122                         m_Name = m_Name.substring(findName.length());
    123                         break;
    124                     }
    125                 }
    126             } else if (node.jjtGetChild(1) instanceof ASTArrayDimsAndInits) {
    127                 //this is incomplete because I dont need it.
    128                 //				child 0 could be primitive or object (ASTName or ASTPrimitiveType)
    129                 isArray = true;
    130             }
    131             m_ASTAllocationExpression = node;
    132         }
    133
    134         public String getName() {
    135             return m_Name;
    136         }
    137
    138         public int getArgumentCount() {
    139             return m_ArgumentCount;
    140         }
    141
    142         public ASTAllocationExpression getASTAllocationExpression() {
    143             return m_ASTAllocationExpression;
    144         }
    145
    146         public boolean isArray() {
    147             return isArray;
    148         }
    149     }
    150
    151     /***
    152      * Outer interface visitation
    153      */
    154     public Object visit(ASTClassOrInterfaceDeclaration node, Object data) {
    155         if (node.isInterface()) {
    156             if (node.isNested()) {
    157                 String interfaceName = node.getImage();
    158                 int formerID = getClassID();
    159                 setClassID(classDataList.size());
    160                 ClassData newClassData = new ClassData(interfaceName);
    161                 //store the names of any outer classes of this class in the classQualifyingName List
    162                 ClassData formerClassData = (ClassData) classDataList.get(formerID);
    163                 newClassData.addClassQualifyingName(formerClassData.getClassName());
    164                 classDataList.add(getClassID(), newClassData);
    165                 Object o = super.visit(node, data);
    166                 setClassID(formerID);
    167                 return o;
    168             } else {
    169                 String interfaceName = node.getImage();
    170                 classDataList.clear();
    171                 setClassID(0);
    172                 classDataList.add(getClassID(), new ClassData(interfaceName));
    173                 Object o = super.visit(node, data);
    174                 if (o != null) {
    175                     processRule(o);
    176                 } else {
    177                     processRule(data);
    178                 }
    179                 setClassID(-1);
    180                 return o;
    181             }
    182         } else if (node.isNested()) {
    183             String className = node.getImage();
    184             int formerID = getClassID();
    185             setClassID(classDataList.size());
    186             ClassData newClassData = new ClassData(className);
    187             // TODO
    188             // this is a hack to bail out here
    189             // but I'm not sure why this is happening
    190             // TODO
    191             if (formerID == -1 || formerID >= classDataList.size()) {
    192                 return null;
    193             }
    194             //store the names of any outer classes of this class in the classQualifyingName List
    195             ClassData formerClassData = (ClassData) classDataList.get(formerID);
    196             newClassData.addClassQualifyingName(formerClassData.getClassName());
    197             classDataList.add(getClassID(), newClassData);
    198             Object o = super.visit(node, data);
    199             setClassID(formerID);
    200             return o;
    201         }
    202         // outer classes
    203         String className = node.getImage();
    204         classDataList.clear();
    205         setClassID(0);//first class
    206         classDataList.add(getClassID(), new ClassData(className));
    207         Object o = super.visit(node, data);
    208         if (o != null) {
    209             processRule(o);
    210         } else {
    211             processRule(data);
    212         }
    213         setClassID(-1);
    214         return o;
    215     }
    216
    217     /***
    218      * Store all target constructors
    219      */
    220     public Object visit(ASTConstructorDeclaration node, Object data) {
    221         if (node.isPrivate()) {
    222             getCurrentClassData().addConstructor(node);
    223         }
    224         return super.visit(node, data);
    225     }
    226
    227     public Object visit(ASTAllocationExpression node, Object data) {
    228         // TODO
    229         // this is a hack to bail out here
    230         // but I'm not sure why this is happening
    231         // TODO
    232         if (classID == -1 || getCurrentClassData() == null) {
    233             return data;
    234         }
    235         AllocData ad = new AllocData(node, packageName, getCurrentClassData().getClassQualifyingNamesList());
    236         if (ad.isArray() == false) {
    237             getCurrentClassData().addInstantiation(ad);
    238         }
    239         return super.visit(node, data);
    240     }
    241
    242     private void processRule(Object ctx) {
    243         //check constructors of outerIterator against allocations of innerIterator
    244         for (Iterator outerIterator = classDataList.iterator(); outerIterator.hasNext();) {
    245             ClassData outerDataSet = (ClassData) outerIterator.next();
    246             for (Iterator constructors = outerDataSet.getPrivateConstructorIterator(); constructors.hasNext();) {
    247                 ASTConstructorDeclaration cd = (ASTConstructorDeclaration) constructors.next();
    248
    249                 for (Iterator innerIterator = classDataList.iterator(); innerIterator.hasNext();) {
    250                     ClassData innerDataSet = (ClassData) innerIterator.next();
    251                     if (outerDataSet == innerDataSet) {
    252                         continue;
    253                     }
    254                     for (Iterator allocations = innerDataSet.getInstantiationIterator(); allocations.hasNext();) {
    255                         AllocData ad = (AllocData) allocations.next();
    256                         //if the constructor matches the instantiation
    257                         //flag the instantiation as a generator of an extra class
    258                         if (outerDataSet.getClassName().equals(ad.getName()) && (cd.getParameterCount() == ad.getArgumentCount())) {
    259                             addViolation(ctx, ad.getASTAllocationExpression());
    260                         }
    261                     }
    262                 }
    263             }
    264         }
    265     }
    266
    267     private ClassData getCurrentClassData() {
    268         // TODO
    269         // this is a hack to bail out here
    270         // but I'm not sure why this is happening
    271         // TODO
    272         if (classID >= classDataList.size()) {
    273             return null;
    274         }
    275         return (ClassData) classDataList.get(classID);
    276     }
    277
    278     private void setClassID(int ID) {
    279         classID = ID;
    280     }
    281
    282     private int getClassID() {
    283         return classID;
    284     }
    285
    286     //remove = Fire.
    287     //value = someFire.Fighter
    288     //        0123456789012345
    289     //index = 4
    290     //remove.size() = 5
    291     //value.substring(0,4) = some
    292     //value.substring(4 + remove.size()) = Fighter
    293     //return "someFighter"
    294     private static String stripString(String remove, String value) {
    295         String returnValue;
    296         int index = value.indexOf(remove);
    297         if (index != -1) {	//if the package name can start anywhere but 0 please inform the author because this will break
    298             returnValue = value.substring(0, index) + value.substring(index + remove.length());
    299         } else {
    300             returnValue = value;
    301         }
    302         return returnValue;
    303     }
    304
    305 }