fix: Better handling the linked resource when getting projects (#694)

- When comparing the project location with the workspace folder path, scan
  the folder with one level deep and check if the linked folder belongs
  to the workspace folder.

Signed-off-by: Sheng Chen <[email protected]>

Author: jdneo

jdtls.ext/com.microsoft.jdtls.ext.core/src/com/microsoft/jdtls/ext/core/ProjectCommand.java

@@ -30,6 +30,8 @@
 import org.apache.commons.lang3.StringUtils;
 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IProject;
+import org.eclipse.core.resources.IResource;
+import org.eclipse.core.resources.IResourceVisitor;
 import org.eclipse.core.resources.IWorkspaceRoot;
 import org.eclipse.core.resources.ResourcesPlugin;
 import org.eclipse.core.runtime.CoreException;
@@ -110,9 +112,21 @@ public static List<PackageNode> listProjects(List<Object> arguments, IProgressMo
 
             PackageNode projectNode = PackageNode.createNodeForProject(JavaCore.create(project));
 
-            // set the folder name as the project name when the project location
-            // is out of the workspace folder.
             if (!workspaceFolderPath.isPrefixOf(project.getLocation())) {
+                LinkedFolderVisitor visitor = new LinkedFolderVisitor(workspaceFolderPath);
+                try {
+                    project.accept(visitor, IResource.DEPTH_ONE, false);
+                } catch (CoreException e) {
+                    JdtlsExtActivator.log(e);
+                    continue;
+                }
+
+                if (!visitor.isBelongsToWorkspace()) {
+                    continue;
+                }
+
+                // set the folder name as the project name when the project location
+                // is out of the workspace folder.
                 projectNode.setDisplayName(workspaceFolderPath.lastSegment());
             }
             children.add(projectNode);
@@ -292,4 +306,40 @@ private static String getSeverityString(int severity) {
                 return "UNKNOWN STATUS";
         }
     }
+
+    private static final class LinkedFolderVisitor implements IResourceVisitor {
+
+        private boolean belongsToWorkspace;
+
+        private IPath workspaceFolderPath;
+
+        public LinkedFolderVisitor(IPath workspaceFolderPath) {
+            this.belongsToWorkspace = false;
+            this.workspaceFolderPath = workspaceFolderPath;
+        }
+
+        @Override
+        public boolean visit(IResource resource) throws CoreException {
+            if (this.belongsToWorkspace) {
+                return false;
+            }
+
+            if (!resource.exists()) {
+                return false;
+            }
+
+            if (resource.isLinked()) {
+                IPath realPath = resource.getLocation();
+                if (workspaceFolderPath.isPrefixOf(realPath)) {
+                    this.belongsToWorkspace = true;
+                }
+            }
+
+            return true;
+        }
+
+        public boolean isBelongsToWorkspace() {
+            return belongsToWorkspace;
+        }
+    }
 }