bruteforcepropertydescriptor.java

一个javabean的转换与copy非常的好用希望大家好好研究一下

  protected void writeDeepDestinationValue(Object destObj, Object destFieldValue, Hint destHint, ClassMap classMap)
      throws IllegalAccessException, InvocationTargetException, InstantiationException, ClassNotFoundException,
      NoSuchMethodException, NoSuchFieldException {
    // follow deep field hierarchy. If any values are null along the way, then create a new instance
    PropertyDescriptor[] hierarchy = getHierarchy(destObj);
    // first, iteratate through hierarchy and instantiate any objects that are null
    Object parentObj = destObj;
    int hierarchyLength = hierarchy.length - 1;
    for (int i = 0; i < hierarchyLength; i++) {
      PropertyDescriptor pd = hierarchy[i];
      Object value = pd.getReadMethod().invoke(parentObj, null);
      Class clazz = null;
      if (value == null) {
        clazz = pd.getPropertyType();
        if (clazz.isInterface()) {
          // before setting the property on the destination object we should check for a destination hint. need to know
          // that we are at the end of the line
          if ((i + 1) == hierarchyLength) {
            // determine the property type
            if (destHint != null) {
              clazz = destHint.getHint();
            }
          }
        }
        Object o;
        try {
          o = clazz.newInstance();
          pd.getWriteMethod().invoke(parentObj, new Object[] { o });
        } catch (InstantiationException e) {
          // lets see if they have a factory we can try. If not...throw the exception:
          if (classMap.getDestClass().getBeanFactory() != null) {
            o = destBeanCreator.createFromFactory(null, classMap.getSourceClass().getClassToMap(), classMap
                .getDestClass().getBeanFactory(), classMap.getDestClass().getFactoryBeanId(), clazz);
            pd.getWriteMethod().invoke(parentObj, new Object[] { o });
          } else {
            throw e;
          }
        }
        value = pd.getReadMethod().invoke(parentObj, null);
      }
      parentObj = value;
    }
    // second, set deep field value
    PropertyDescriptor pd = hierarchy[hierarchy.length - 1];
    if (pd.getReadMethod().getReturnType().isPrimitive() && destFieldValue == null) {
    } else {
      if (!field.isIndexed()) {
        Method method = pd.getWriteMethod();
        if(method == null && field.getTheSetMethod() != null) {
          // lets see if we can find a custom method
          method = findAMethod(parentObj.getClass(), field.getTheSetMethod());
        }
        method.invoke(parentObj, new Object[] { destFieldValue });
      } else {
        writeIndexedValue(pd, parentObj, destFieldValue);
      }
    }
  }

  protected PropertyDescriptor[] getHierarchy(Object obj) {
    if (hierarchy == null) {
      hierarchy = reflectionUtils.getDeepFieldHierarchy(obj.getClass(), field.getName());
    }
    return hierarchy;
  }

  public String getReadMethodName() {
    if (readMethod != null) {
      return readMethod.getName();
    } else {
      try {
        readMethod = getReadMethod(clazz);
      } catch (MappingException e) {
        log.debug("Can't find read method for class:" + clazz + " and field:" + field.getName());
        return "NoReadMethodFound";
      }
      return readMethod.getName();
    }
  }

  public String getWriteMethodName() {
    if (writeMethod != null) {
      return writeMethod.getName();
    } else {
      writeMethod = getWriteMethod();
      return writeMethod.getName();
    }
  }

  public Method getReadMethod() {
    return getReadMethod(clazz);
  }

  protected Method getReadMethod(Class bean) {
    if (readMethod == null || !readMethod.getDeclaringClass().isAssignableFrom(bean)) {
      if (field.getTheGetMethod() == null) {
        readMethod = getReadMethod(clazz, field.getName());
      } else {
        try {
          readMethod = findAMethod(clazz, field.getTheGetMethod());
        } catch (Exception e) {
          throw new MappingException(e);
        }
      }
    }
    return readMethod;
  }

  public Method getWriteMethod() {
    if (writeMethod == null || !writeMethod.getDeclaringClass().isAssignableFrom(clazz)) {
      if (field.getTheSetMethod() == null || field.getName().indexOf(MapperConstants.DEEP_FIELD_DELIMITOR) > 0) {
        writeMethod = getWriteMethod(clazz, field.getName());
      } else {
        try {
          writeMethod = findAMethod(clazz, field.getTheSetMethod());
        } catch (Exception e) {
          throw new MappingException(e);
        }
      }
    }
    return writeMethod;
  }

  protected Object getValueOfIndexedField(Object object, int index) {
    if (object instanceof Collection) {
      Collection c = (Collection) object;
      if ((c != null) && (index > -1) && (index < c.size())) {
        Iterator iter = c.iterator();
        for (int x = 0; x < index; x++) {
          iter.next();
        }
        return iter.next();
      } else {
        return null;
      }
    } else if (object instanceof Object[]) {
      Object[] objs = (Object[]) object;
      if ((objs != null) && (index > -1) && (index < objs.length)) {
        return objs[index];
      } else {
        return null;
      }
    } else {
      return null;
    }
  }

  protected void writeIndexedValue(PropertyDescriptor pd, Object destObj, Object destFieldValue)
      throws IllegalAccessException, InvocationTargetException, NoSuchMethodException, ClassNotFoundException,
      NoSuchFieldException {
    int index = field.getIndex();
    Object o = getReadMethod().invoke(destObj, null);
    if (o == null) {
      Class returnType = getPropertyType();
      if (returnType.isArray()) {
        o = Array.newInstance(returnType.getComponentType(), 1);
      } else if (collectionUtils.isSet(returnType)) {
        o = new HashSet();
      } else { // default
        o = new ArrayList();
      }
    }
    if (o instanceof Collection) {
      Collection newCollection;
      if (o instanceof Set) {
        newCollection = new HashSet();
      } else {
        newCollection = new ArrayList();
      }

      Collection c = (Collection) o;
      Iterator i = c.iterator();
      int x = 0;
      while (i.hasNext()) {
        if (x != index) {
          newCollection.add(i.next());
        } else {
          newCollection.add(destFieldValue);
        }
        x++;
      }
      if (newCollection.size() <= index) {
        while (newCollection.size() < index) {
          newCollection.add(null);
        }
        newCollection.add(destFieldValue);
      }
      getWriteMethod().invoke(destObj, new Object[] { newCollection });
    } else if (o.getClass().isArray()) {
      Object[] objs = (Object[]) o;
      Object[] x = (Object[]) Array.newInstance(objs.getClass().getComponentType(),
          objs.length > index ? objs.length + 1 : index + 1);
      for (int i = 0; i < objs.length; i++) {
        x[i] = objs[i];
      }
      x[index] = destFieldValue;

      if (pd == null) {
        getWriteMethod().invoke(destObj, new Object[] { x });
      } else {
        pd.getWriteMethod().invoke(destObj, new Object[] { x });
      }
    }
  }

}