| using System.Diagnostics; |
| using System.Text; |
| |
| namespace Lucene.Net.Search.Spans |
| { |
| /* |
| * 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 ToStringUtils = Lucene.Net.Util.ToStringUtils; |
| |
| /// <summary> |
| /// Matches spans near the beginning of a field. |
| /// <para/> |
| /// This class is a simple extension of <see cref="SpanPositionRangeQuery"/> in that it assumes the |
| /// start to be zero and only checks the end boundary. |
| /// </summary> |
| public class SpanFirstQuery : SpanPositionRangeQuery |
| { |
| /// <summary> |
| /// Construct a <see cref="SpanFirstQuery"/> matching spans in <paramref name="match"/> whose end |
| /// position is less than or equal to <paramref name="end"/>. |
| /// </summary> |
| public SpanFirstQuery(SpanQuery match, int end) |
| : base(match, 0, end) |
| { |
| } |
| |
| protected override AcceptStatus AcceptPosition(Spans spans) |
| { |
| Debug.Assert(spans.Start != spans.End, "start equals end: " + spans.Start); |
| if (spans.Start >= m_end) |
| { |
| return AcceptStatus.NO_AND_ADVANCE; |
| } |
| else if (spans.End <= m_end) |
| { |
| return AcceptStatus.YES; |
| } |
| else |
| { |
| return AcceptStatus.NO; |
| } |
| } |
| |
| public override string ToString(string field) |
| { |
| StringBuilder buffer = new StringBuilder(); |
| buffer.Append("spanFirst("); |
| buffer.Append(m_match.ToString(field)); |
| buffer.Append(", "); |
| buffer.Append(m_end); |
| buffer.Append(")"); |
| buffer.Append(ToStringUtils.Boost(Boost)); |
| return buffer.ToString(); |
| } |
| |
| public override object Clone() |
| { |
| SpanFirstQuery spanFirstQuery = new SpanFirstQuery((SpanQuery)m_match.Clone(), m_end); |
| spanFirstQuery.Boost = Boost; |
| return spanFirstQuery; |
| } |
| |
| public override bool Equals(object o) |
| { |
| if (this == o) |
| { |
| return true; |
| } |
| if (!(o is SpanFirstQuery)) |
| { |
| return false; |
| } |
| |
| SpanFirstQuery other = (SpanFirstQuery)o; |
| return this.m_end == other.m_end && this.m_match.Equals(other.m_match) && this.Boost == other.Boost; |
| } |
| |
| public override int GetHashCode() |
| { |
| int h = m_match.GetHashCode(); |
| h ^= (h << 8) | ((int)((uint)h >> 25)); // reversible |
| h ^= J2N.BitConversion.SingleToRawInt32Bits(Boost) ^ m_end; |
| return h; |
| } |
| } |
| } |