2 files changed, 15 insertions, 0 deletions
diff --git a/org.eclipse.core.filebuffers/src/org/eclipse/core/filebuffers/IFileBuffer.java b/org.eclipse.core.filebuffers/src/org/eclipse/core/filebuffers/IFileBuffer.java
index c8d60f93aeb..4bace6fd76c 100644
--- a/org.eclipse.core.filebuffers/src/org/eclipse/core/filebuffers/IFileBuffer.java
+++ b/org.eclipse.core.filebuffers/src/org/eclipse/core/filebuffers/IFileBuffer.java
@@ -34,6 +34,13 @@ public interface IFileBuffer {
 	 * @return the underlying file of this file buffer
 	 */
 	IFile getUnderlyingFile();
+
+	/**
+	 * Returns whether the underlying file of this file buffer has changed.
+	 * 
+	 * @return <code>true</code> if the underlying file of this file buffer has changed
+	 */
+	boolean hasUnderlyingFileChanged();
 	
 	/**
 	 * Reverts the contents of this file buffer to the content of its underlying file. After 
diff --git a/org.eclipse.core.filebuffers/src/org/eclipse/core/internal/filebuffers/FileBuffer.java b/org.eclipse.core.filebuffers/src/org/eclipse/core/internal/filebuffers/FileBuffer.java
index e58f2eb6fe4..809a4dee885 100644
--- a/org.eclipse.core.filebuffers/src/org/eclipse/core/internal/filebuffers/FileBuffer.java
+++ b/org.eclipse.core.filebuffers/src/org/eclipse/core/internal/filebuffers/FileBuffer.java
@@ -217,6 +217,7 @@ public abstract class FileBuffer implements IFileBuffer {
 		fFile= file;
 		fFileSynchronizer= new FileSynchronizer();
 		refreshFile(monitor);
+		fModificationStamp= fFile.getModificationStamp();
 		
 		initializeFileBufferContent(monitor);
 		addFileBufferContentListeners();
@@ -337,4 +338,11 @@ public abstract class FileBuffer implements IFileBuffer {
 		ILog log= Platform.getPlugin(FileBuffersPlugin.PLUGIN_ID).getLog();
 		log.log(exception.getStatus());
 	}
+	
+	/*
+	 * @see IFileBuffer#hasUnderlyingFileChanged()
+	 */
+	public boolean hasUnderlyingFileChanged() {
+		return fModificationStamp != fFile.getModificationStamp();
+	}
 }