Initial commit of lightweight Lucene.Net to be used in Mono

1 files changed, 96 insertions, 0 deletions

diff --git a/src/core/Search/FilteredDocIdSetIterator.cs b/src/core/Search/FilteredDocIdSetIterator.cs
new file mode 100644
index 0000000..29e93b5
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+++ b/src/core/Search/FilteredDocIdSetIterator.cs
@@ -0,0 +1,96 @@
+/* 
+ * 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.Search
+{
+	
+	/// <summary> Abstract decorator class of a DocIdSetIterator
+	/// implementation that provides on-demand filter/validation
+	/// mechanism on an underlying DocIdSetIterator.  See <see cref="FilteredDocIdSet" />
+	///.
+	/// </summary>
+	public abstract class FilteredDocIdSetIterator:DocIdSetIterator
+	{
+		protected internal DocIdSetIterator internalInnerIter;
+		private int doc;
+		
+		/// <summary> Constructor.</summary>
+		/// <param name="innerIter">Underlying DocIdSetIterator.
+		/// </param>
+		protected FilteredDocIdSetIterator(DocIdSetIterator innerIter)
+		{
+			if (innerIter == null)
+			{
+				throw new System.ArgumentException("null iterator");
+			}
+			internalInnerIter = innerIter;
+			doc = - 1;
+		}
+		
+		/// <summary> Validation method to determine whether a docid should be in the result set.</summary>
+		/// <param name="doc">docid to be tested
+		/// </param>
+		/// <returns> true if input docid should be in the result set, false otherwise.
+		/// </returns>
+		/// <seealso cref="FilteredDocIdSetIterator(DocIdSetIterator)">
+		/// </seealso>
+		public abstract /*protected internal*/ bool Match(int doc);
+		
+		public override int DocID()
+		{
+			return doc;
+		}
+		
+		public override int NextDoc()
+		{
+			while ((doc = internalInnerIter.NextDoc()) != NO_MORE_DOCS)
+			{
+				if (Match(doc))
+				{
+					return doc;
+				}
+			}
+			return doc;
+		}
+		
+		public override int Advance(int target)
+		{
+			doc = internalInnerIter.Advance(target);
+			if (doc != NO_MORE_DOCS)
+			{
+				if (Match(doc))
+				{
+					return doc;
+				}
+				else
+				{
+					while ((doc = internalInnerIter.NextDoc()) != NO_MORE_DOCS)
+					{
+						if (Match(doc))
+						{
+							return doc;
+						}
+					}
+					return doc;
+				}
+			}
+			return doc;
+		}
+	}
+}
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