Package com.atlassian.adf.model.node

Class Placeholder

  • All Implemented Interfaces:
    Element, Node, CaptionContent, InlineContent
    @Documentation(state=UNDOCUMENTED,
               date="2023-07-26")
public class Placeholder
extends AbstractNode<Placeholder>
implements CaptionContent, InlineContent
    Provides placeholder text for something.

    Facts:

    • This seems to render an empty <span></span>
    • The unpublished documentation for it just says it is a container.
    • The unpublished documentation includes an optional content array
    • The JSON schema, however, does not allow any content within a placeholder_node
    What are we to make of this? Your humble library author speculates that it is intended to be dynamically replaced with some other content after the initial rendering and that the editor team never fully implemented this feature. It may be that the inlineExtension has made this node type obsolete. These are just wild guesses, however.

    • Method Detail

      • copy

        public Placeholder copy()
        Description copied from interface: Element
        Returns a deep copy of this element, including copies of any nodes or marks that it contains. The copy will not necessarily be in exactly the same state as the original in some cases. For example, a text node that is used inside a codeBlock will have the ability to use marks on it disabled, but a copy made of the text node using this method will not similarly disallow marks unless it is also added to a content node with those same restrictions.

        Implementations notes:

        • Implementations should narrow the return type.
        • Implementations should return this if the element is immutable. The @Immutable annotation should be used on the class to offer additional confirmation of this intent.
        • Implementations should return parse(toMap()) if they have state.
        • While there may be cases where it is worthwhile to do something more efficient than the conversion to a map and back, this is discouraged because it would add yet another fragile piece of code that breaks when new data is added to the node. The parse and toMap methods already have to be updated in these circumstances, so it makes sense to take advantage of that.
        Specified by:
        copy in interface Element
        Specified by:
        copy in interface Node
        Returns:
        a copy of this element, or this if the element is immutable anyway

      • elementType

        public String elementType()
        Description copied from interface: Element
        The type value that identifies this element, such as "paragraph" or "strong".
        Specified by:
        elementType in interface Element

      • validate

        public void validate()
        Description copied from interface: Element
        Verifies that the node is well-formed (including the state of any descendents that it has).
        Specified by:
        validate in interface Element

      • nodeHashCode

        protected int nodeHashCode()
        Description copied from class: AbstractNode
        Allows nodes that have their own fields to augment the hashCode implementation with a hash of their own field values.

        Implementations need not include the node's class; that is already covered by the AbstractNode.hashCode() implementation that is expected to be this method's only consumer.

        Just as with the relationship between hashCode, equals, and toString for ordinary Java classes, subclasses of AbstractNode should maintain consistent implementations of nodeHashCode, nodeEquals, and appendNodeFields.

        Overrides:
        nodeHashCode in class AbstractNode<Placeholder>
        Returns:
        the hash code of any additional field values that belong to a particular type of content node.
        See Also:
        AbstractNode.nodeEquals(AbstractNode), AbstractNode.appendNodeFields(ToStringHelper)

      • nodeEquals

        protected boolean nodeEquals​(Placeholder other)
        Description copied from class: AbstractNode
        Allows nodes that have their own fields to augment the equals implementation with tests for their own field values.

        Implementations need not check for identity, null, or a different node class; those are already covered by the AbstractNode.equals(Object) implementation that is expected to be this method's only consumer.

        Just as with the relationship between hashCode, equals, and toString for ordinary Java classes, subclasses of AbstractNode should maintain consistent implementations of nodeHashCode, nodeEquals, and appendNodeFields.

        Overrides:
        nodeEquals in class AbstractNode<Placeholder>
        Returns:
        true if all additional field values that belong to a particular type of content node test as equal; false if differences are found
        See Also:
        AbstractNode.nodeHashCode(), AbstractNode.appendNodeFields(ToStringHelper)

      • toMap

        public Map<String,​?> toMap()
        Description copied from interface: Element
        Transforms this element to a map of String values to various basic object types suitable for direct rendering as JSON content.
        Specified by:
        toMap in interface Element
        Returns:
        the map representation of this ADF element

      • appendPlainText

        public void appendPlainText​(StringBuilder sb)
        Description copied from interface: Node
        Renders this node as plain-text suitable for viewing by end users. This is equivalent to calling Node.toPlainText() and appending the result to the given buffer, except that it may be slightly more efficient, since it will write directly to the existing buffer instead of using a temporary buffer and having to make a copy of the result.
        Specified by:
        appendPlainText in interface Node
        Overrides:
        appendPlainText in class AbstractNode<Placeholder>
        Parameters:
        sb - where to write the result