POC of google-java-format support

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

Author: CsCherrYY

package.json

@@ -648,10 +648,12 @@
             {
               "type": "string",
               "enum": [
-                "eclipse"
+                "eclipse",
+                "google"
               ],
               "enumDescriptions": [
-                "Use the eclipse formatter."
+                "Use the eclipse formatter.",
+                "Use the google-java-format formatter."
               ],
               "markdownDescription": "Specifies the formatter style."
             },
@@ -664,10 +666,12 @@
                 "style": {
                   "type": "string",
                   "enum": [
-                    "eclipse"
+                    "eclipse",
+                    "google"
                   ],
                   "enumDescriptions": [
-                    "Use the eclipse formatter."
+                    "Use the eclipse formatter.",
+                    "Use the google-java-format formatter."
                   ],
                   "markdownDescription": "Specifies the formatter style."
                 },

src/javaServerStarter.ts

@@ -82,6 +82,19 @@ function prepareParams(requirements: RequirementsData, javaConfiguration, worksp
 				'java.base/java.util=ALL-UNNAMED',
 				'--add-opens',
 				'java.base/java.lang=ALL-UNNAMED',
+				// See https://github.com/google/google-java-format#as-a-library
+				'--add-opens',
+				'jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED',
+				'--add-opens',
+				'jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED',
+				'--add-opens',
+				'jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED',
+				'--add-opens',
+				'jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED',
+				'--add-opens',
+				'jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED',
+				'--add-opens',
+				'jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED',
 				// See https://github.com/redhat-developer/vscode-java/issues/2264
 				// It requires the internal API sun.nio.fs.WindowsFileAttributes.isDirectoryLink() to check if a Windows directory is symlink.
 				'--add-opens',