类 CustomCollectionEditor

构造器详细资料

• CustomCollectionEditor

  public CustomCollectionEditor​(Class<? extends Collection> collectionType)

  Create a new CustomCollectionEditor for the given target type, keeping an incoming null as-is.

  参数:

  collectionType - the target type, which needs to be a sub-interface of Collection or a concrete Collection class

  另请参阅:

  Collection, ArrayList, TreeSet, LinkedHashSet

• CustomCollectionEditor

  public CustomCollectionEditor​(Class<? extends Collection> collectionType,
                                boolean nullAsEmptyCollection)

  Create a new CustomCollectionEditor for the given target type.

  If the incoming value is of the given type, it will be used as-is. If it is a different Collection type or an array, it will be converted to a default implementation of the given Collection type. If the value is anything else, a target Collection with that single value will be created.

  The default Collection implementations are: ArrayList for List, TreeSet for SortedSet, and LinkedHashSet for Set.

  参数:

  collectionType - the target type, which needs to be a sub-interface of Collection or a concrete Collection class

  nullAsEmptyCollection - whether to convert an incoming null value to an empty Collection (of the appropriate type)

  另请参阅:

  Collection, ArrayList, TreeSet, LinkedHashSet

方法详细资料

• setAsText

  public void setAsText​(String text)
                 throws IllegalArgumentException

  Convert the given text value to a Collection with a single element.

  指定者:

  setAsText 在接口中 PropertyEditor

  覆盖:

  setAsText 在类中 PropertyEditorSupport

  抛出:

  IllegalArgumentException

• setValue

  public void setValue​(@Nullable
                       Object value)

  Convert the given value to a Collection of the target type.

  指定者:

  setValue 在接口中 PropertyEditor

  覆盖:

  setValue 在类中 PropertyEditorSupport

• createCollection

  protected Collection<Object> createCollection​(Class<? extends Collection> collectionType,
                                                int initialCapacity)

  Create a Collection of the given type, with the given initial capacity (if supported by the Collection type).

  参数:

  collectionType - a sub-interface of Collection

  initialCapacity - the initial capacity

  返回:

  the new Collection instance

• alwaysCreateNewCollection

  protected boolean alwaysCreateNewCollection()

  Return whether to always create a new Collection, even if the type of the passed-in Collection already matches.

  Default is "false"; can be overridden to enforce creation of a new Collection, for example to convert elements in any case.

  另请参阅:

  convertElement(java.lang.Object)

• convertElement

  protected Object convertElement​(Object element)

  Hook to convert each encountered Collection/array element. The default implementation simply returns the passed-in element as-is.

  Can be overridden to perform conversion of certain elements, for example String to Integer if a String array comes in and should be converted to a Set of Integer objects.

  Only called if actually creating a new Collection! This is by default not the case if the type of the passed-in Collection already matches. Override alwaysCreateNewCollection() to enforce creating a new Collection in every case.

  参数:

  element - the source element

  返回:

  the element to be used in the target Collection

  另请参阅:

  alwaysCreateNewCollection()

• getAsText

  @Nullable
  public String getAsText()

  This implementation returns null to indicate that there is no appropriate text representation.

  指定者:

  getAsText 在接口中 PropertyEditor

  覆盖:

  getAsText 在类中 PropertyEditorSupport