lahodaj commented on code in PR #6329:
URL: https://github.com/apache/netbeans/pull/6329#discussion_r1310354827


##########
java/java.file.launcher/src/org/netbeans/modules/java/file/launcher/SharedRootData.java:
##########
@@ -0,0 +1,121 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.netbeans.modules.java.file.launcher;
+
+import java.io.IOException;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Properties;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+import org.netbeans.api.annotations.common.CheckForNull;
+import org.netbeans.modules.java.file.launcher.SingleSourceFileUtil;
+import org.openide.filesystems.FileAttributeEvent;
+import org.openide.filesystems.FileChangeAdapter;
+import org.openide.filesystems.FileChangeListener;
+import org.openide.filesystems.FileObject;
+import org.openide.filesystems.FileUtil;
+import org.openide.util.Exceptions;
+
+/**
+ *
+ * @author lahvac
+ */
+public class SharedRootData {
+
+    private static final Pattern ENABLE_PREVIEW_PATTERN = 
Pattern.compile("(^|[ \t])--enable-preview($|[ \t])");
+    private static final Pattern SOURCE_PATTERN = Pattern.compile("(^|[ 
\t])--source[ \t]+([0-9]+(\\.[0-9]+)*)($|[ \t])");
+    private static Map<FileObject, SharedRootData> root2Data = new HashMap<>();
+
+    public static synchronized void ensureRootRegistered(FileObject root) {
+        root2Data.computeIfAbsent(root, r -> new SharedRootData(r));
+    }
+
+    public static synchronized @CheckForNull SharedRootData 
getDataForRoot(FileObject root) {
+        return root2Data.get(root);
+    }
+
+    private final FileObject root;
+    private final Properties options = new Properties();
+    private final FileChangeListener listener = new FileChangeAdapter() {
+        @Override
+        public void fileAttributeChanged(FileAttributeEvent fe) {
+            Map<String, String> newProperties = new HashMap<>();
+
+            addPropertiesFor(fe.getFile(), newProperties);
+            setNewProperties(newProperties);

Review Comment:
   No, because the previous values are persisted in the `options` field. But, 
it is true a file's options are not cleared when the file is deleted. I'll fix 
that.



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