1 files changed, 108 insertions, 0 deletions

diff --git a/src/core/Index/SegmentMergeInfo.cs b/src/core/Index/SegmentMergeInfo.cs
new file mode 100644
index 0000000..bad0aad
--- /dev/null
+++ b/src/core/Index/SegmentMergeInfo.cs
@@ -0,0 +1,108 @@
+/* 
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+using System;
+
+namespace Lucene.Net.Index
+{
+	
+	sealed class SegmentMergeInfo : IDisposable
+	{
+		internal Term term;
+		internal int base_Renamed;
+		internal int ord; // the position of the segment in a MultiReader
+		internal TermEnum termEnum;
+		internal IndexReader reader;
+		internal int delCount;
+		private TermPositions postings; // use getPositions()
+		private int[] docMap; // use getDocMap()
+
+	    private bool isDisposed;
+		
+		internal SegmentMergeInfo(int b, TermEnum te, IndexReader r)
+		{
+			base_Renamed = b;
+			reader = r;
+			termEnum = te;
+			term = te.Term;
+		}
+		
+		// maps around deleted docs
+		internal int[] GetDocMap()
+		{
+			if (docMap == null)
+			{
+				delCount = 0;
+				// build array which maps document numbers around deletions 
+				if (reader.HasDeletions)
+				{
+					int maxDoc = reader.MaxDoc;
+					docMap = new int[maxDoc];
+					int j = 0;
+					for (int i = 0; i < maxDoc; i++)
+					{
+						if (reader.IsDeleted(i))
+						{
+							delCount++;
+							docMap[i] = - 1;
+						}
+						else
+							docMap[i] = j++;
+					}
+				}
+			}
+			return docMap;
+		}
+		
+		internal TermPositions GetPositions()
+		{
+			if (postings == null)
+			{
+				postings = reader.TermPositions();
+			}
+			return postings;
+		}
+		
+		internal bool Next()
+		{
+			if (termEnum.Next())
+			{
+				term = termEnum.Term;
+				return true;
+			}
+			else
+			{
+				term = null;
+				return false;
+			}
+		}
+
+        public void Dispose()
+        {
+            if (isDisposed) return;
+
+            // Move to protected method if class becomes unsealed
+            termEnum.Close();
+            if (postings != null)
+            {
+                postings.Close();
+            }
+
+            isDisposed = true;
+        }
+	}
+}
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