| 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 incoming elements. |
| /// <para/> |
| /// @lucene.experimental |
| /// </summary> |
| public class BufferedInputEnumerator : IInputEnumerator |
| { |
| // TODO keep this for now |
| /// <summary> |
| /// buffered term entries </summary> |
| protected BytesRefArray m_entries = new BytesRefArray(Counter.NewCounter()); |
| /// <summary> |
| /// buffered payload entries </summary> |
| protected BytesRefArray m_payloads = new BytesRefArray(Counter.NewCounter()); |
| /// <summary> |
| /// buffered context set entries </summary> |
| protected IList<ICollection<BytesRef>> m_contextSets = new List<ICollection<BytesRef>>(); |
| /// <summary> |
| /// current buffer position </summary> |
| protected int m_curPos = -1; |
| /// <summary> |
| /// buffered weights, parallel with <see cref="m_entries"/> </summary> |
| protected long[] m_freqs = new long[1]; |
| private readonly BytesRef spare = new BytesRef(); |
| private readonly BytesRef payloadSpare = new BytesRef(); |
| private readonly bool hasPayloads; |
| private readonly IComparer<BytesRef> comp; |
| |
| private readonly bool hasContexts; |
| protected BytesRef m_current; |
| |
| /// <summary> |
| /// Creates a new iterator, buffering entries from the specified iterator </summary> |
| public BufferedInputEnumerator(IInputEnumerator source) |
| { |
| int freqIndex = 0; |
| hasPayloads = source.HasPayloads; |
| hasContexts = source.HasContexts; |
| while (source.MoveNext()) |
| { |
| m_entries.Append(source.Current); |
| if (hasPayloads) |
| { |
| m_payloads.Append(source.Payload); |
| } |
| if (hasContexts) |
| { |
| m_contextSets.Add(source.Contexts); |
| } |
| if (freqIndex >= m_freqs.Length) |
| { |
| m_freqs = ArrayUtil.Grow(m_freqs, m_freqs.Length + 1); |
| } |
| m_freqs[freqIndex++] = source.Weight; |
| } |
| comp = source.Comparer; |
| } |
| |
| public virtual long Weight => m_freqs[m_curPos]; |
| |
| public virtual BytesRef Current => m_current; |
| |
| public virtual bool MoveNext() |
| { |
| if (++m_curPos < m_entries.Length) |
| { |
| m_entries.Get(spare, m_curPos); |
| m_current = spare; |
| } |
| m_current = null; |
| return false; |
| } |
| |
| public virtual BytesRef Payload |
| { |
| get |
| { |
| if (hasPayloads && m_curPos < m_payloads.Length) |
| { |
| return m_payloads.Get(payloadSpare, m_curPos); |
| } |
| return null; |
| } |
| } |
| |
| public virtual bool HasPayloads => hasPayloads; |
| |
| public virtual IComparer<BytesRef> Comparer => comp; |
| |
| public virtual ICollection<BytesRef> Contexts |
| { |
| get |
| { |
| if (hasContexts && m_curPos < m_contextSets.Count) |
| { |
| return m_contextSets[m_curPos]; |
| } |
| return null; |
| } |
| } |
| |
| public virtual bool HasContexts => hasContexts; |
| } |
| } |