Oxygen XML Author plugin 13.2.0

Table 1: Interfaces for the DnD listenerAuthor Developer Guide | 217InterfaceDescriptionro.sync.exml.editor.xmleditor.pageauthor.AuthorCustomDnDHandler Receives callbacks from the Oxygen XML Author pluginstandalone application for Drag And Drop in Author mode.com.oxygenxml.editor.editors.author.AuthorDnDListener Receives callbacks from the Oxygen XML Author pluginEclipse plugin for Drag And Drop in Author mode.com.oxygenxml.editor.editors.TextDnDListenerReceives callbacks from the Oxygen XML Author pluginEclipse plugin for Drag And Drop in Text mode.Configuring a References ResolverYou need to provide a handler for resolving references and obtain the content they refer. In our case the element whichhas references is ref and the attribute indicating the referred resource is location. You will have to implement a Javaextension class for obtaining the referred resources.Note: The Javadoc documentation of the Author API used in the example files is available on the Oxygen XMLwebsite. Also it can be downloaded as a zip archive from the website.1. Create the class simple.documentation.framework.ReferencesResolver. This class must implementthe ro.sync.ecss.extensions.api.AuthorReferenceResolver interface.import ro.sync.ecss.extensions.api.AuthorReferenceResolver;import ro.sync.ecss.extensions.api.AuthorAccess;import ro.sync.ecss.extensions.api.node.AttrValue;import ro.sync.ecss.extensions.api.node.AuthorElement;import ro.sync.ecss.extensions.api.node.AuthorNode;public class ReferencesResolverimplements AuthorReferenceResolver {2. The hasReferences method verifies if the handler considers the node to have references. It takes as argumentan AuthorNode that represents the node which will be verified. The method will return true if the node isconsidered to have references. In our case, to be a reference the node must be an element with the name ref and itmust have an attribute named location.public boolean hasReferences(AuthorNode node) {boolean hasReferences = false;if (node.getType() == AuthorNode.NODE_TYPE_ELEMENT) {AuthorElement element = (AuthorElement) node;if ("ref".equals(element.getLocalName())) {AttrValue attrValue = element.getAttribute("location");hasReferences = attrValue != null;}}return hasReferences;}3. The method getDisplayName returns the display name of the node that contains the expanded referred content.It takes as argument an AuthorNode that represents the node for which the display name is needed. The referredcontent engine will ask this AuthorReferenceResolver implementation what is the display name for eachnode which is considered a reference. In our case the display name is the value of the location attribute from the refelement.public String getDisplayName(AuthorNode node) {String displayName = "ref-fragment";