Example #1
0
  /**
   * Returns the correct implementation instance for the interface <code>type</code>. For convention
   * the implentation is named <code>InterfaceName + Impl</code>.
   *
   * @param type The interface type
   * @return The correct ModelProxy subclass (if exists), a ModelProxy instance otherwise
   * @throws MalformedModelException is the interface or the implementation are not well formed
   *     (they don't respect the conventions).
   * @throws ModelRuntimeException is any error occurs during the instantiation
   */
  protected ModelProxy createInstance(Class type) {
    Class backClass;
    if (implementations.containsKey(type)) backClass = implementations.get(type);
    else {
      /* type never seen */

      try {
        Package pkg = type.getPackage();
        String pkgN = pkg == null ? "" : pkg.getName();

        backClass = Class.forName(pkgN + tableName(type) + CommonStatic.getImplementationSuffix());

      } catch (Exception e) {
        backClass = ModelProxy.class;
      }

      Validator.validateModel(type, backClass);

      initFieldsTypes(type);
      implementations.put(type, backClass);
    }

    ModelProxy impl = null;
    try {
      impl = (ModelProxy) backClass.newInstance();
    } catch (Exception e) {
      throw new ModelRuntimeException(e.getMessage());
    }

    return impl;
  }
  //
  // Find all the java.sql interfaces implemented by a class and find
  // the methods in those interfaces which raise
  // SQLFeatureNotSupportedException when called on the passed-in candidate object.
  //
  private void vetInterfaces(
      Object candidate,
      Class myClass,
      HashSet<String> unsupportedList,
      HashSet<String> notUnderstoodList)
      throws Exception {
    Class superClass = myClass.getSuperclass();

    if (superClass != null) {
      vetInterfaces(candidate, superClass, unsupportedList, notUnderstoodList);
    }

    //
    // The contract for Class.getInterfaces() states that the interfaces
    // come back in a deterministic order, namely, in the order that
    // they were declared in the "extends" clause.
    //
    Class<?>[] interfaces = myClass.getInterfaces();
    int interfaceCount = interfaces.length;

    for (int i = 0; i < interfaceCount; i++) {
      Class<?> iface = interfaces[i];

      if (iface.getPackage().getName().equals(SQL_PACKAGE_NAME)) {
        vetInterfaceMethods(candidate, iface, unsupportedList, notUnderstoodList);
      }

      vetInterfaces(candidate, iface, unsupportedList, notUnderstoodList);
    }
  }
 public void apply()
     throws IllegalAccessException, InvocationTargetException, InstantiationException {
   if (type.isEnum()) {
     for (T instance : type.getEnumConstants()) {
       assertThat(
           instance.toString(),
           is(
               type.getCanonicalName().substring(type.getPackage().getName().length() + 1)
                   + "."
                   + ((Enum<?>) instance).name()));
     }
     return;
   }
   for (Constructor<?> constructor : type.getDeclaredConstructors()) {
     if (constructor.isSynthetic() && skipSynthetic) {
       continue;
     }
     constructor.setAccessible(true);
     Class<?>[] parameterTypes = constructor.getParameterTypes();
     Object[] actualArguments = new Object[parameterTypes.length];
     Object[] otherArguments = new Object[parameterTypes.length];
     int index = 0;
     for (Class<?> parameterType : parameterTypes) {
       putInstance(parameterType, actualArguments, otherArguments, index++);
     }
     int testIndex = 0;
     @SuppressWarnings("unchecked")
     T instance = (T) constructor.newInstance(actualArguments);
     assertThat(instance, is(instance));
     assertThat(instance, not(is((Object) null)));
     assertThat(instance, not(is(new Object())));
     Object similarInstance = constructor.newInstance(actualArguments);
     assertThat(instance.hashCode(), is(similarInstance.hashCode()));
     assertThat(instance, is(similarInstance));
     if (skipToString) {
       assertThat(instance.toString(), notNullValue());
     } else if (optionalToStringRegex == null) {
       checkString(instance);
     } else {
       assertThat(instance.toString(), new RegexMatcher(optionalToStringRegex));
     }
     for (Object otherArgument : otherArguments) {
       Object[] compareArguments = new Object[actualArguments.length];
       int argumentIndex = 0;
       for (Object actualArgument : actualArguments) {
         if (argumentIndex == testIndex) {
           compareArguments[argumentIndex] = otherArgument;
         } else {
           compareArguments[argumentIndex] = actualArgument;
         }
         argumentIndex++;
       }
       Object unlikeInstance = constructor.newInstance(compareArguments);
       assertThat(instance.hashCode(), not(is(unlikeInstance)));
       assertThat(instance, not(is(unlikeInstance)));
       testIndex++;
     }
   }
 }
Example #4
0
  public static void main(String[] args) throws Exception {
    Class<ClassTest> clazz = ClassTest.class;

    System.out.println("=============================================");
    Constructor[] ctors = clazz.getDeclaredConstructors();
    System.out.println("classTest的全部构造器如下:");
    for (Constructor c : ctors) {
      System.out.println(c);
    }

    System.out.println("=============================================");
    Constructor[] publicCtors = clazz.getConstructors();
    System.out.println("ClassTest的全部public构造器如下:");
    for (Constructor c : publicCtors) {
      System.out.println(c);
    }

    System.out.println("=============================================");
    Method[] mtds = clazz.getMethods();
    System.out.println("ClassTest的全部public方法如下:");
    for (Method md : mtds) {
      System.out.println(md);
    }

    System.out.println("=============================================");
    System.out.println("ClassTest带一个字符串参数的info方法为:" + clazz.getMethod("info", String.class));

    Annotation[] ans = clazz.getAnnotations();
    System.out.println("ClassTest的全部annotation为:");
    for (Annotation an : ans) {
      System.out.println(an);
    }
    System.out.println("该元素上的@SuppressWarnings注释为:" + clazz.getAnnotation(SuppressWarnings.class));

    System.out.println("=============================================");
    Class<?>[] inners = clazz.getDeclaredClasses();
    System.out.println("ClassTest的全部内部类如下:");
    for (Class c : inners) {
      System.out.println(c);
    }

    System.out.println("=============================================");

    Class inClazz = Class.forName("ClassTest$Inner");
    System.out.println("inClazz对应的外部类为:" + inClazz.getDeclaringClass());
    System.out.println("ClassTest的包为:" + clazz.getPackage());
    System.out.println("ClassTest的父类:" + clazz.getSuperclass());
  }
  protected void loadClassDependencies(Class aClass) throws ClassNotFoundException {
    String name = aClass.getName();
    if (myVisited.add(aClass)) {
      try {
        for (Method method : aClass.getDeclaredMethods()) {
          loadTypeDependencies(method.getGenericReturnType());
          for (Type type : method.getGenericExceptionTypes()) {
            loadTypeDependencies(type);
          }
          for (Type type : method.getGenericParameterTypes()) {
            loadTypeDependencies(type);
          }
        }
        for (Constructor method : aClass.getDeclaredConstructors()) {
          for (Type type : method.getGenericExceptionTypes()) {
            loadTypeDependencies(type);
          }
          for (Type type : method.getGenericParameterTypes()) {
            loadTypeDependencies(type);
          }
        }

        for (Field field : aClass.getDeclaredFields()) {
          loadTypeDependencies(field.getGenericType());
        }

        Type superclass = aClass.getGenericSuperclass();
        if (superclass != null) {
          loadClassDependencies(aClass);
        }

        for (Type intf : aClass.getGenericInterfaces()) {
          loadTypeDependencies(intf);
        }

        aClass.getAnnotations();
        Package aPackage = aClass.getPackage();
        if (aPackage != null) {
          aPackage.getAnnotations();
        }
      } catch (LinkageError e) {
        throw new ClassNotFoundException(name);
      } catch (TypeNotPresentException e) {
        throw new ClassNotFoundException(name);
      }
    }
  }
 private void checkString(T instance) {
   assertThat(
       instance.toString(),
       CoreMatchers.startsWith(
           type.getCanonicalName().substring(type.getPackage().getName().length() + 1) + "{"));
   assertThat(instance.toString(), endsWith("}"));
   Class<?> currentType = type;
   do {
     for (Field field : type.getDeclaredFields()) {
       if (!field.isSynthetic()
           && !Modifier.isStatic(field.getModifiers())
           && !ignoredFields.contains(field.getName())) {
         assertThat(instance.toString(), containsString(field.getName()));
       }
     }
   } while ((currentType = currentType.getSuperclass()) != Object.class);
 }
 public String getPublicMethodsForClasses(String classNames[]) {
   StringBuilder result = new StringBuilder();
   String className = null;
   result.append("<classDefinitions>");
   if (classNames != null && classNames.length > 0) {
     for (int i = 0; i < classNames.length; i++) {
       className = classNames[i];
       if (className != null) {
         result.append("<classDefinition>");
         try {
           Class c = Class.forName(className);
           result.append(
               (new StringBuilder("<classSimpleName>"))
                   .append(c.getSimpleName())
                   .append("</classSimpleName>")
                   .toString());
           result.append(
               (new StringBuilder("<classFullName>"))
                   .append(c.getName())
                   .append("</classFullName>")
                   .toString());
           Package pack = c.getPackage();
           String packStr = "";
           if (pack != null) packStr = pack.getName();
           result.append(
               (new StringBuilder("<packageName>"))
                   .append(packStr)
                   .append("</packageName>")
                   .toString());
           Method methods[] = c.getMethods();
           Method method = null;
           result.append("<methods>");
           if (methods != null) {
             for (int j = 0; j < methods.length; j++) {
               method = methods[j];
               if (method != null && !methodsExclude.contains(method.getName())) {
                 result.append("<method>");
                 result.append(
                     (new StringBuilder("<methodSignature>"))
                         .append(method.toString())
                         .append("</methodSignature>")
                         .toString());
                 result.append(
                     (new StringBuilder("<methodName>"))
                         .append(method.getName())
                         .append("</methodName>")
                         .toString());
                 result.append(
                     (new StringBuilder("<returnType>"))
                         .append(method.getReturnType().getName())
                         .append("</returnType>")
                         .toString());
                 Class paramClasses[] = method.getParameterTypes();
                 result.append("<params>");
                 if (paramClasses != null) {
                   for (int l = 0; l < paramClasses.length; l++)
                     if (paramClasses[l] != null)
                       result.append(
                           (new StringBuilder("<param>"))
                               .append(paramClasses[l].getName())
                               .append("</param>")
                               .toString());
                 }
                 result.append("</params>");
                 result.append("</method>");
               }
             }
           }
           result.append("</methods>");
         } catch (ClassNotFoundException e) {
           result.append(
               (new StringBuilder("<classFullName>"))
                   .append(className)
                   .append("</classFullName>")
                   .toString());
           result.append(
               (new StringBuilder("<error>Problem retrieving "))
                   .append(className)
                   .append(" information</error>")
                   .toString());
           System.out.println(e.getMessage());
         }
         result.append("</classDefinition>");
       }
     }
   }
   result.append("</classDefinitions>");
   return result.toString();
 }
  public String getPublicPropertiesForClasses(String classNames[]) {
    StringBuilder result = new StringBuilder();
    String className = null;
    ArrayList publicFields = new ArrayList();
    result.append("<classDefinitions>");
    if (classNames != null && classNames.length > 0) {
      for (int i = 0; i < classNames.length; i++) {
        className = classNames[i];
        if (className != null) {
          result.append("<classDefinition>");
          try {
            Class c = Class.forName(className);
            Field fields[] = c.getFields();
            Field field = null;
            if (fields != null) {
              for (int k = 0; k < fields.length; k++) {
                field = fields[k];
                if (field != null)
                  publicFields.add(
                      (new StringBuilder(String.valueOf(field.getName())))
                          .append(",")
                          .append(field.getType().getName())
                          .toString());
              }
            }
            try {
              BeanInfo b = Introspector.getBeanInfo(c);
              result.append(
                  (new StringBuilder("<classSimpleName>"))
                      .append(c.getSimpleName())
                      .append("</classSimpleName>")
                      .toString());
              result.append(
                  (new StringBuilder("<classFullName>"))
                      .append(c.getName())
                      .append("</classFullName>")
                      .toString());
              Package pack = c.getPackage();
              String packStr = "";
              if (pack != null) packStr = pack.getName();
              result.append(
                  (new StringBuilder("<packageName>"))
                      .append(packStr)
                      .append("</packageName>")
                      .toString());
              PropertyDescriptor pds[] = b.getPropertyDescriptors();
              if (pds != null) {
                for (int propCount = 0; propCount < pds.length; propCount++) {
                  PropertyDescriptor pd = pds[propCount];
                  String propertyName = pd.getName();
                  Method readMethod = pd.getReadMethod();
                  Method writeMethod = pd.getWriteMethod();
                  if (readMethod != null
                      && isPublicAccessor(readMethod.getModifiers())
                      && writeMethod != null
                      && isPublicAccessor(writeMethod.getModifiers()))
                    publicFields.add(
                        (new StringBuilder(String.valueOf(propertyName)))
                            .append(",")
                            .append(pd.getPropertyType().getName())
                            .toString());
                }
              }
            } catch (Exception e) {
              e.printStackTrace();
            }
            if (publicFields != null && publicFields.size() > 0) {
              String temp = null;
              result.append("<publicFields>");
              for (int counter = 0; counter < publicFields.size(); counter++) {
                temp = (String) publicFields.get(counter);
                if (temp != null) {
                  String pubTemp[] = temp.split(",");
                  if (pubTemp.length == 2) {
                    result.append("<publicField>");
                    result.append(
                        (new StringBuilder("<publicFieldName>"))
                            .append(pubTemp[0])
                            .append("</publicFieldName>")
                            .toString());
                    result.append(
                        (new StringBuilder("<publicFieldType>"))
                            .append(pubTemp[1])
                            .append("</publicFieldType>")
                            .toString());
                    result.append("</publicField>");
                  }
                }
              }

              result.append("</publicFields>");
            }
          } catch (ClassNotFoundException e) {
            result.append(
                (new StringBuilder("<classFullName>"))
                    .append(className)
                    .append("</classFullName>")
                    .toString());
            result.append(
                (new StringBuilder("<error>Problem retrieving "))
                    .append(className)
                    .append(" information</error>")
                    .toString());
            System.out.println(e.getMessage());
          }
          result.append("</classDefinition>");
        }
      }
    }
    result.append("</classDefinitions>");
    return result.toString();
  }
  public static void main(String[] args) {

    // Obtain the class object if we know the name of the class
    Class rental = RentCar.class;
    try {
      // get the absolute name of the class
      String rentalClassPackage = rental.getName();
      System.out.println("Class Name is: " + rentalClassPackage);

      // get the simple name of the class (without package info)
      String rentalClassNoPackage = rental.getSimpleName();
      System.out.println("Class Name without package is: " + rentalClassNoPackage);

      // get the package name of the class
      Package rentalPackage = rental.getPackage();
      System.out.println("Package Name is: " + rentalPackage);

      // get all the constructors of the class
      Constructor[] constructors = rental.getConstructors();
      System.out.println("Constructors are: " + Arrays.toString(constructors));

      // get constructor with specific argument
      Constructor constructor = rental.getConstructor(Integer.TYPE);

      // initializing an object of the RentCar class
      RentCar rent = (RentCar) constructor.newInstance(455);

      // get all methods of the class including declared methods of
      // superclasses
      // in that case, superclass of RentCar is the class java.lang.Object
      Method[] allmethods = rental.getMethods();
      System.out.println("Methods are: " + Arrays.toString(allmethods));
      for (Method method : allmethods) {
        System.out.println("method = " + method.getName());
      }

      // get all methods declared in the class
      // but excludes inherited methods.
      Method[] declaredMethods = rental.getDeclaredMethods();
      System.out.println("Declared Methods are: " + Arrays.toString(declaredMethods));
      for (Method dmethod : declaredMethods) {
        System.out.println("method = " + dmethod.getName());
      }

      // get method with specific name and parameters
      Method oneMethod = rental.getMethod("computeRentalCost", new Class[] {Integer.TYPE});
      System.out.println("Method is: " + oneMethod);

      // call computeRentalCost method with parameter int
      oneMethod.invoke(rent, 4);

      // get all the parameters of computeRentalCost
      Class[] parameterTypes = oneMethod.getParameterTypes();
      System.out.println(
          "Parameter types of computeRentalCost() are: " + Arrays.toString(parameterTypes));

      // get the return type of computeRentalCost
      Class returnType = oneMethod.getReturnType();
      System.out.println("Return type is: " + returnType);

      // gets all the public member fields of the class RentCar
      Field[] fields = rental.getFields();

      System.out.println("Public Fields are: ");
      for (Field oneField : fields) {
        // get public field name
        Field field = rental.getField(oneField.getName());
        String fieldname = field.getName();
        System.out.println("Fieldname is: " + fieldname);

        // get public field type
        Object fieldType = field.getType();
        System.out.println("Type of field " + fieldname + " is: " + fieldType);

        // get public field value
        Object value = field.get(rent);
        System.out.println("Value of field " + fieldname + " is: " + value);
      }

      // How to access private member fields of the class

      // getDeclaredField() returns the private field
      Field privateField = RentCar.class.getDeclaredField("type");

      String name = privateField.getName();
      System.out.println("One private Fieldname is: " + name);
      // makes this private field instance accessible
      // for reflection use only, not normal code
      privateField.setAccessible(true);

      // get the value of this private field
      String fieldValue = (String) privateField.get(rent);
      System.out.println("fieldValue = " + fieldValue);

    } catch (NoSuchFieldException e) {
      e.printStackTrace();
    } catch (NoSuchMethodException e) {
      e.printStackTrace();
    } catch (IllegalArgumentException e) {
      e.printStackTrace();
    } catch (IllegalAccessException e) {
      e.printStackTrace();
    } catch (InstantiationException e) {
      e.printStackTrace();
    } catch (InvocationTargetException e) {
      e.printStackTrace();
    }
  }