| using Lucene.Net.Diagnostics; |
| using System; |
| using System.Diagnostics; |
| |
| namespace Lucene.Net.Index |
| { |
| /* |
| * 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 IBits = Lucene.Net.Util.IBits; |
| |
| /// <summary> |
| /// Exposes a slice of an existing <see cref="IBits"/> as a new <see cref="IBits"/>. |
| /// <para/> |
| /// @lucene.internal |
| /// </summary> |
| internal sealed class BitsSlice : IBits |
| { |
| private readonly IBits parent; |
| private readonly int start; |
| private readonly int length; |
| |
| // start is inclusive; end is exclusive (length = end-start) |
| public BitsSlice(IBits parent, ReaderSlice slice) |
| { |
| this.parent = parent; |
| this.start = slice.Start; |
| this.length = slice.Length; |
| if (Debugging.AssertsEnabled) Debugging.Assert(length >= 0,"length={0}", length); |
| } |
| |
| public bool Get(int doc) |
| { |
| if (doc >= length) |
| { |
| throw new Exception("doc " + doc + " is out of bounds 0 .. " + (length - 1)); |
| } |
| if (Debugging.AssertsEnabled) Debugging.Assert(doc < length,"doc={0} length={1}", doc, length); |
| return parent.Get(doc + start); |
| } |
| |
| public int Length => length; |
| } |
| } |