New version which was lost after removing repo.

src/difflib/InsertDelta.java

@@ -1,3 +1,21 @@
+/*
+    Copyright 2009 Dmitry Naumenko (dm.naumenko@gmail.com)
+    
+    This file is part of Java Diff Utills Library.
+
+    Java Diff Utills Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Java Diff Utills Library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with Java Diff Utills Library.  If not, see <http://www.gnu.org/licenses/>.
+*/
 package difflib;
 
 import java.util.List;
@@ -18,9 +36,11 @@ public class InsertDelta extends Delta {
 
 	/**
 	 * {@inheritDoc}
+	 * @throws PatchFailedException 
 	 */
 	@Override
-	public void applyTo(List<Object> target) {
+	public void applyTo(List<Object> target) throws PatchFailedException {
+		verify(target);
 		int position = this.getOriginal().getPosition(); 
 		List<?> lines = this.getRevised().getLines();
 		for (int i = 0; i < lines.size(); i++) {
@@ -28,4 +48,30 @@ public class InsertDelta extends Delta {
 		}
 	}
 
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public void restore(List<Object> target) {
+		int position = getRevised().getPosition();
+		int size = getRevised().getSize();
+		for (int i = 0; i < size; i++) {
+			target.remove(position);
+		}
+	}
+
+	@Override
+	public void verify(List<?> target) throws PatchFailedException {
+		if (getOriginal().getPosition() > target.size()) {
+            throw new PatchFailedException("Incorrect patch for delta: " +
+            		"delta original position > target size");
+        }
+		
+	}
+
+	@Override
+	public String toString() {
+		return "[InsertDelta, position: " + getOriginal().getPosition() + ", lines: " + 
+			getRevised().getLines() + "]"; 
+	}
 }