1 files changed, 71 insertions, 0 deletions
diff --git a/src/core/Search/PrefixTermEnum.cs b/src/core/Search/PrefixTermEnum.cs
new file mode 100644
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+++ b/src/core/Search/PrefixTermEnum.cs
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+/* 
+ * 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;
+
+using IndexReader = Lucene.Net.Index.IndexReader;
+using Term = Lucene.Net.Index.Term;
+
+namespace Lucene.Net.Search
+{
+	
+	/// <summary> Subclass of FilteredTermEnum for enumerating all terms that match the
+	/// specified prefix filter term.
+	/// <p/>
+	/// Term enumerations are always ordered by Term.compareTo().  Each term in
+	/// the enumeration is greater than all that precede it.
+	/// 
+	/// </summary>
+	public class PrefixTermEnum:FilteredTermEnum
+	{
+		
+		private Term prefix;
+		private bool endEnum = false;
+		
+		public PrefixTermEnum(IndexReader reader, Term prefix)
+		{
+			this.prefix = prefix;
+			
+			SetEnum(reader.Terms(new Term(prefix.Field, prefix.Text)));
+		}
+		
+		public override float Difference()
+		{
+			return 1.0f;
+		}
+		
+		public override bool EndEnum()
+		{
+			return endEnum;
+		}
+
+	    protected internal virtual Term PrefixTerm
+	    {
+	        get { return prefix; }
+	    }
+
+	    protected internal override bool TermCompare(Term term)
+		{
+			if ((System.Object) term.Field == (System.Object) prefix.Field && term.Text.StartsWith(prefix.Text))
+			{
+				return true;
+			}
+			endEnum = true;
+			return false;
+		}
+	}
+}
+\ No newline at end of file