Fix UnsupportedOperationException when creating 'scratch file' in IntelliJ IDEA

Signed-off-by: Dmytro Nosan <[email protected]>

Author: nosan

spring-javaformat-intellij-idea/spring-javaformat-intellij-idea-plugin/src/main/java/io/spring/format/formatter/intellij/formatting/SpringJavaFormatFormattingService.java

@@ -78,7 +78,7 @@ public boolean canFormat(@NotNull PsiFile file) {
 	public void formatDocument(@NotNull Document document, @NotNull List<TextRange> formattingRanges,
 			@NotNull FormattingContext formattingContext, boolean canChangeWhiteSpaceOnly, boolean quickFormat) {
 		VirtualFile file = formattingContext.getVirtualFile();
-		Path path = (file != null) ? file.toNioPath() : null;
+		Path path = (file != null) ? file.getFileSystem().getNioPath(file) : null;
 		JavaFormatConfig config = JavaFormatConfig.findFrom(path);
 		Formatter formatter = new Formatter(config);
 		String source = document.getText();

spring-javaformat-intellij-idea/spring-javaformat-intellij-idea-plugin/src/test/java/io/spring/format/formatter/intellij/formatting/SpringJavaFormatFormattingServiceTests.java

@@ -25,6 +25,8 @@
 import com.intellij.openapi.fileTypes.FileTypeManager;
 import com.intellij.openapi.fileTypes.PlainTextFileType;
 import com.intellij.openapi.project.Project;
+import com.intellij.openapi.vfs.VirtualFile;
+import com.intellij.openapi.vfs.VirtualFileSystem;
 import com.intellij.psi.PsiFile;
 import org.junit.jupiter.api.Test;
 
@@ -78,6 +80,9 @@ void formatDocumentAppliesFormatting() {
 		String text = "public class Hello {}";
 		given(document.getText()).willReturn(text);
 		FormattingContext formattingContext = mock(FormattingContext.class);
+		VirtualFile virtualFile = mock(VirtualFile.class);
+		given(virtualFile.getFileSystem()).willReturn(mock(VirtualFileSystem.class));
+		given(formattingContext.getVirtualFile()).willReturn(virtualFile);
 		this.service.formatDocument(document, Collections.emptyList(), formattingContext, false, false);
 		verify(document).replaceString(20, 20, "\n\n");
 	}