Index: CHANGES.txt
===================================================================
--- CHANGES.txt	(revision 671218)
+++ CHANGES.txt	(working copy)
@@ -83,6 +83,9 @@
     DeletionPolicy that keeps more than the last commit around.
     (Jason Rutherglen via Mike McCandless)
 
+12. LUCENE-1325: Added IndexCommit.isOptimized().  (Shalin Shekhar
+    Mangar via Mike McCandless)
+
 Bug fixes
     
  1. LUCENE-1134: Fixed BooleanQuery.rewrite to only optimize a single 
Index: src/test/org/apache/lucene/index/TestIndexReader.java
===================================================================
--- src/test/org/apache/lucene/index/TestIndexReader.java	(revision 671218)
+++ src/test/org/apache/lucene/index/TestIndexReader.java	(working copy)
@@ -1315,6 +1315,16 @@
 
       IndexReader r2 = r.reopen();
       assertFalse(c.equals(r2.getIndexCommit()));
+      assertFalse(r2.getIndexCommit().isOptimized());
+      r2.close();
+
+      writer = new IndexWriter(d, new StandardAnalyzer(), false, IndexWriter.MaxFieldLength.LIMITED);
+      writer.optimize();
+      writer.close();
+
+      r2 = r.reopen();
+      assertTrue(r2.getIndexCommit().isOptimized());
+
       r.close();
       r2.close();
       d.close();
Index: src/test/org/apache/lucene/index/TestDeletionPolicy.java
===================================================================
--- src/test/org/apache/lucene/index/TestDeletionPolicy.java	(revision 671218)
+++ src/test/org/apache/lucene/index/TestDeletionPolicy.java	(working copy)
@@ -61,11 +61,16 @@
   class KeepAllDeletionPolicy implements IndexDeletionPolicy {
     int numOnInit;
     int numOnCommit;
+    Directory dir;
     public void onInit(List commits) {
       verifyCommitOrder(commits);
       numOnInit++;
     }
-    public void onCommit(List commits) {
+    public void onCommit(List commits) throws IOException {
+      IndexCommit lastCommit = (IndexCommit) commits.get(commits.size()-1);
+      IndexReader r = IndexReader.open(dir);
+      assertEquals("lastCommit.isOptimized()=" + lastCommit.isOptimized() + " vs IndexReader.isOptimized=" + r.isOptimized(), r.isOptimized(), lastCommit.isOptimized());
+      r.close();
       verifyCommitOrder(commits);
       numOnCommit++;
     }
@@ -263,10 +268,12 @@
       KeepAllDeletionPolicy policy = new KeepAllDeletionPolicy();
 
       Directory dir = new RAMDirectory();
+      policy.dir = dir;
 
       IndexWriter writer = new IndexWriter(dir, autoCommit, new WhitespaceAnalyzer(), true, policy, IndexWriter.MaxFieldLength.LIMITED);
       writer.setMaxBufferedDocs(10);
       writer.setUseCompoundFile(useCompoundFile);
+      writer.setMergeScheduler(new SerialMergeScheduler());
       for(int i=0;i<107;i++) {
         addDoc(writer);
         if (autoCommit && i%10 == 0)
Index: src/java/org/apache/lucene/index/DirectoryIndexReader.java
===================================================================
--- src/java/org/apache/lucene/index/DirectoryIndexReader.java	(revision 671218)
+++ src/java/org/apache/lucene/index/DirectoryIndexReader.java	(working copy)
@@ -360,6 +360,7 @@
     Directory dir;
     long generation;
     long version;
+    final boolean isOptimized;
 
     ReaderCommit(SegmentInfos infos, Directory dir) throws IOException {
       segmentsFileName = infos.getCurrentSegmentFileName();
@@ -374,7 +375,12 @@
       }
       version = infos.getVersion();
       generation = infos.getGeneration();
+      isOptimized = infos.size() == 1 && !infos.info(0).hasDeletions();
     }
+
+    public boolean isOptimized() {
+      return isOptimized;
+    }
     public String getSegmentsFileName() {
       return segmentsFileName;
     }
Index: src/java/org/apache/lucene/index/IndexCommit.java
===================================================================
--- src/java/org/apache/lucene/index/IndexCommit.java	(revision 671218)
+++ src/java/org/apache/lucene/index/IndexCommit.java	(working copy)
@@ -75,6 +75,13 @@
   }
 
   /**
+   * Returns true if this commit is an optimized index.
+   */
+  public boolean isOptimized() {
+    throw new UnsupportedOperationException("This IndexCommit does not support this method.");
+  }
+
+  /**
    * Two IndexCommits are equal if both their Directory and versions are equal.
    */
   public boolean equals(Object other) {
Index: src/java/org/apache/lucene/index/IndexFileDeleter.java
===================================================================
--- src/java/org/apache/lucene/index/IndexFileDeleter.java	(revision 671218)
+++ src/java/org/apache/lucene/index/IndexFileDeleter.java	(working copy)
@@ -579,6 +579,7 @@
     Collection commitsToDelete;
     long version;
     long generation;
+    final boolean isOptimized;
 
     public CommitPoint(Collection commitsToDelete, Directory directory, SegmentInfos segmentInfos) throws IOException {
       this.directory = directory;
@@ -595,9 +596,14 @@
         if (segmentInfo.dir == directory) {
           files.addAll(segmentInfo.files());
         }
-      }
+      } 
+      isOptimized = segmentInfos.size() == 1 && !segmentInfos.info(0).hasDeletions();
     }
 
+    public boolean isOptimized() {
+      return isOptimized;
+    }
+
     public String getSegmentsFileName() {
       return segmentsFileName;
     }