Cache the path of VFileEvent to avoid recomputing it for every listener

platform/core-api/src/com/intellij/openapi/vfs/newvfs/events/VFileContentChangeEvent.java

@@ -61,7 +61,7 @@ public class VFileContentChangeEvent extends VFileEvent {
 
   @NotNull
   @Override
-  public String getPath() {
+  protected String computePath() {
     return myFile.getPath();
   }
 

platform/core-api/src/com/intellij/openapi/vfs/newvfs/events/VFileCopyEvent.java

@@ -59,7 +59,7 @@ public class VFileCopyEvent extends VFileEvent {
 
   @NotNull
   @Override
-  public String getPath() {
+  protected String computePath() {
     return myNewParent.getPath() + "/" + myNewChildName;
   }
 

platform/core-api/src/com/intellij/openapi/vfs/newvfs/events/VFileCreateEvent.java

@@ -63,7 +63,7 @@ public class VFileCreateEvent extends VFileEvent {
 
   @NotNull
   @Override
-  public String getPath() {
+  protected String computePath() {
     return myParent.getPath() + "/" + myChildName;
   }
 

platform/core-api/src/com/intellij/openapi/vfs/newvfs/events/VFileDeleteEvent.java

@@ -47,7 +47,7 @@ public class VFileDeleteEvent extends VFileEvent {
 
   @NotNull
   @Override
-  public String getPath() {
+  protected String computePath() {
     return myFile.getPath();
   }
 

platform/core-api/src/com/intellij/openapi/vfs/newvfs/events/VFileEvent.java

@@ -15,6 +15,7 @@
  */
 package com.intellij.openapi.vfs.newvfs.events;
 
+import com.intellij.openapi.util.AtomicNotNullLazyValue;
 import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.openapi.vfs.VirtualFileSystem;
 import org.jetbrains.annotations.NotNull;
@@ -26,6 +27,7 @@ import org.jetbrains.annotations.Nullable;
 public abstract class VFileEvent {
   private final boolean myIsFromRefresh;
   private final Object myRequestor;
+  @NotNull private final AtomicNotNullLazyValue<String> myPath = AtomicNotNullLazyValue.createValue(this::computePath);
 
   public VFileEvent(Object requestor, final boolean isFromRefresh) {
     myRequestor = requestor;
@@ -41,7 +43,12 @@ public abstract class VFileEvent {
   }
 
   @NotNull
-  public abstract String getPath();
+  public String getPath() {
+    return myPath.getValue();
+  }
+
+  @NotNull
+  protected abstract String computePath();
 
   /**
    * Returns the VirtualFile which this event belongs to.

platform/core-api/src/com/intellij/openapi/vfs/newvfs/events/VFileMoveEvent.java

@@ -59,7 +59,7 @@ public class VFileMoveEvent extends VFileEvent {
 
   @NotNull
   @Override
-  public String getPath() {
+  protected String computePath() {
     return myFile.getPath();
   }
 

platform/core-api/src/com/intellij/openapi/vfs/newvfs/events/VFilePropertyChangeEvent.java

@@ -101,7 +101,7 @@ public class VFilePropertyChangeEvent extends VFileEvent {
 
   @NotNull
   @Override
-  public String getPath() {
+  protected String computePath() {
     return myFile.getPath();
   }