RepositoryState: add method canAmend

The method canAmend was added to RepositoryState. It returns true if
amending the HEAD commit is allowed in the current repository state.

Change-Id: Idd0c4eea83a23c41340789b7b877959b457d951e
Signed-off-by: Jens Baumgart <jens.baumgart@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/lib/RepositoryState.java

@@ -60,6 +60,7 @@ public enum RepositoryState {
 		public boolean canCheckout() { return false; }
 		public boolean canResetHead() { return false; }
 		public boolean canCommit() { return false; }
+		public boolean canAmend() { return false; }
 		public String getDescription() { return "Bare"; }
 	},
 
@@ -70,6 +71,7 @@ public enum RepositoryState {
 		public boolean canCheckout() { return true; }
 		public boolean canResetHead() { return true; }
 		public boolean canCommit() { return true; }
+		public boolean canAmend() { return true; }
 		public String getDescription() { return JGitText.get().repositoryState_normal; }
 	},
 
@@ -79,6 +81,7 @@ public enum RepositoryState {
 		public boolean canCheckout() { return false; }
 		public boolean canResetHead() { return true; }
 		public boolean canCommit() { return false; }
+		public boolean canAmend() { return false; }
 		public String getDescription() { return JGitText.get().repositoryState_conflicts; }
 	},
 
@@ -90,6 +93,7 @@ public enum RepositoryState {
 		public boolean canCheckout() { return true; }
 		public boolean canResetHead() { return true; }
 		public boolean canCommit() { return true; }
+		public boolean canAmend() { return false; }
 		public String getDescription() { return JGitText.get().repositoryState_merged; }
 	},
 
@@ -99,6 +103,7 @@ public enum RepositoryState {
 		public boolean canCheckout() { return false; }
 		public boolean canResetHead() { return true; }
 		public boolean canCommit() { return false; }
+		public boolean canAmend() { return false; }
 		public String getDescription() { return JGitText.get().repositoryState_conflicts; }
 	},
 
@@ -110,6 +115,7 @@ public enum RepositoryState {
 		public boolean canCheckout() { return true; }
 		public boolean canResetHead() { return true; }
 		public boolean canCommit() { return true; }
+		public boolean canAmend() { return false; }
 		public String getDescription() { return JGitText.get().repositoryState_merged; }
 	},
 
@@ -120,6 +126,7 @@ public enum RepositoryState {
 		public boolean canCheckout() { return false; }
 		public boolean canResetHead() { return false; }
 		public boolean canCommit() { return true; }
+		public boolean canAmend() { return true; }
 		public String getDescription() { return JGitText.get().repositoryState_rebaseOrApplyMailbox; }
 	},
 
@@ -130,6 +137,7 @@ public enum RepositoryState {
 		public boolean canCheckout() { return false; }
 		public boolean canResetHead() { return false; }
 		public boolean canCommit() { return true; }
+		public boolean canAmend() { return true; }
 		public String getDescription() { return JGitText.get().repositoryState_rebase; }
 	},
 
@@ -140,6 +148,7 @@ public enum RepositoryState {
 		public boolean canCheckout() { return false; }
 		public boolean canResetHead() { return false; }
 		public boolean canCommit() { return true; }
+		public boolean canAmend() { return true; }
 		public String getDescription() { return JGitText.get().repositoryState_applyMailbox; }
 	},
 
@@ -150,6 +159,7 @@ public enum RepositoryState {
 		public boolean canCheckout() { return false; }
 		public boolean canResetHead() { return false; }
 		public boolean canCommit() { return true; }
+		public boolean canAmend() { return true; }
 		public String getDescription() { return JGitText.get().repositoryState_rebaseWithMerge; }
 	},
 
@@ -160,6 +170,7 @@ public enum RepositoryState {
 		public boolean canCheckout() { return false; }
 		public boolean canResetHead() { return false; }
 		public boolean canCommit() { return true; }
+		public boolean canAmend() { return true; }
 		public String getDescription() { return JGitText.get().repositoryState_rebaseInteractive; }
 	},
 
@@ -176,6 +187,8 @@ public enum RepositoryState {
 		/* Commit during bisect is useful */
 		public boolean canCommit() { return true; }
 
+		public boolean canAmend() { return false; }
+
 		public String getDescription() { return JGitText.get().repositoryState_bisecting; }
 	};
 
@@ -194,6 +207,11 @@ public enum RepositoryState {
 	 */
 	public abstract boolean canResetHead();
 
+	/**
+	 * @return true if amending is considered SAFE
+	 */
+	public abstract boolean canAmend();
+
 	/**
 	 * @return a human readable description of the state.
 	 */