| using Lucene.Net.Diagnostics; |
| using Lucene.Net.Util; |
| using System; |
| using System.Collections.Generic; |
| |
| namespace Lucene.Net.Search.Suggest |
| { |
| /* |
| * 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. |
| */ |
| |
| /// <summary> |
| /// This wrapper buffers the incoming elements and makes sure they are in |
| /// random order. |
| /// @lucene.experimental |
| /// </summary> |
| public class UnsortedInputEnumerator : BufferedInputEnumerator |
| { |
| // TODO keep this for now |
| private readonly int[] ords; |
| private int currentOrd = -1; |
| private readonly BytesRef spare = new BytesRef(); |
| private readonly BytesRef payloadSpare = new BytesRef(); |
| |
| /// <summary> |
| /// Creates a new iterator, wrapping the specified iterator and |
| /// returning elements in a random order. |
| /// </summary> |
| public UnsortedInputEnumerator(IInputEnumerator source) |
| : base(source) |
| { |
| ords = new int[m_entries.Length]; |
| Random random = new Random(); |
| for (int i = 0; i < ords.Length; i++) |
| { |
| ords[i] = i; |
| } |
| for (int i = 0; i < ords.Length; i++) |
| { |
| int randomPosition = random.Next(ords.Length); |
| int temp = ords[i]; |
| ords[i] = ords[randomPosition]; |
| ords[randomPosition] = temp; |
| } |
| } |
| |
| public override long Weight |
| { |
| get |
| { |
| if (Debugging.AssertsEnabled) Debugging.Assert(currentOrd == ords[m_curPos]); |
| return m_freqs[currentOrd]; |
| } |
| } |
| |
| public override bool MoveNext() |
| { |
| if (++m_curPos < m_entries.Length) |
| { |
| currentOrd = ords[m_curPos]; |
| m_current = m_entries.Get(spare, currentOrd); |
| return true; |
| } |
| m_current = null; |
| return false; |
| } |
| |
| public override BytesRef Payload |
| { |
| get |
| { |
| if (HasPayloads && m_curPos < m_payloads.Length) |
| { |
| if (Debugging.AssertsEnabled) Debugging.Assert(currentOrd == ords[m_curPos]); |
| return m_payloads.Get(payloadSpare, currentOrd); |
| } |
| return null; |
| } |
| } |
| |
| public override ICollection<BytesRef> Contexts |
| { |
| get |
| { |
| if (HasContexts && m_curPos < m_contextSets.Count) |
| { |
| if (Debugging.AssertsEnabled) Debugging.Assert(currentOrd == ords[m_curPos]); |
| return m_contextSets[currentOrd]; |
| } |
| return null; |
| } |
| } |
| } |
| } |