Module java.xml
Package org.w3c.dom

Interface UserDataHandler


  • public interface UserDataHandler
    When associating an object to a key on a node using Node.setUserData() the application can provide a handler that gets called when the node the object is associated to is being cloned, imported, or renamed. This can be used by the application to implement various behaviors regarding the data it associates to the DOM nodes. This interface defines that handler.

    See also the Document Object Model (DOM) Level 3 Core Specification.

    Since:
    1.5, DOM Level 3

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static short NODE_ADOPTED
      The node is adopted, using Document.adoptNode().
      static short NODE_CLONED
      The node is cloned, using Node.cloneNode().
      static short NODE_DELETED
      The node is deleted.
      static short NODE_IMPORTED
      The node is imported, using Document.importNode().
      static short NODE_RENAMED
      The node is renamed, using Document.renameNode().

    • Field Detail

      • NODE_CLONED

        static final short NODE_CLONED
        The node is cloned, using Node.cloneNode().
        See Also:
        Constant Field Values

      • NODE_IMPORTED

        static final short NODE_IMPORTED
        The node is imported, using Document.importNode().
        See Also:
        Constant Field Values

      • NODE_DELETED

        static final short NODE_DELETED
        The node is deleted.

        Note: This may not be supported or may not be reliable in certain environments, such as Java, where the implementation has no real control over when objects are actually deleted.

        See Also:
        Constant Field Values

      • NODE_RENAMED

        static final short NODE_RENAMED
        The node is renamed, using Document.renameNode().
        See Also:
        Constant Field Values

      • NODE_ADOPTED

        static final short NODE_ADOPTED
        The node is adopted, using Document.adoptNode().
        See Also:
        Constant Field Values

    • Method Detail

      • handle

        void handle​(short operation,
            String key,
            Object data,
            Node src,
            Node dst)
        This method is called whenever the node for which this handler is registered is imported or cloned.
        DOM applications must not raise exceptions in a UserDataHandler. The effect of throwing exceptions from the handler is DOM implementation dependent.
        Parameters:
        operation - Specifies the type of operation that is being performed on the node.
        key - Specifies the key for which this handler is being called.
        data - Specifies the data for which this handler is being called.
        src - Specifies the node being cloned, adopted, imported, or renamed. This is null when the node is being deleted.
        dst - Specifies the node newly created if any, or null.