| using Lucene.Net.Diagnostics; |
| using System; |
| using System.Runtime.CompilerServices; |
| |
| namespace Lucene.Net.Util.Fst |
| { |
| /* |
| * 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 DataInput = Lucene.Net.Store.DataInput; |
| using DataOutput = Lucene.Net.Store.DataOutput; |
| |
| /// <summary> |
| /// An FST <see cref="Outputs{T}"/> implementation where each output |
| /// is a non-negative <see cref="T:long?"/> value. |
| /// <para/> |
| /// NOTE: This was PositiveIntOutputs in Lucene |
| /// <para/> |
| /// @lucene.experimental |
| /// </summary> |
| public sealed class PositiveInt32Outputs : Outputs<long?> |
| { |
| private const long NO_OUTPUT = new long(); |
| |
| private static readonly PositiveInt32Outputs singleton = new PositiveInt32Outputs(); |
| |
| private PositiveInt32Outputs() |
| { |
| } |
| |
| public static PositiveInt32Outputs Singleton => singleton; |
| |
| public override long? Common(long? output1, long? output2) |
| { |
| if (Debugging.AssertsEnabled) |
| { |
| Debugging.Assert(Valid(output1)); |
| Debugging.Assert(Valid(output2)); |
| } |
| if (output1 == NO_OUTPUT || output2 == NO_OUTPUT) |
| { |
| return NO_OUTPUT; |
| } |
| else |
| { |
| if (Debugging.AssertsEnabled) |
| { |
| Debugging.Assert(output1 > 0); |
| Debugging.Assert(output2 > 0); |
| } |
| return Math.Min(output1.Value, output2.Value); |
| } |
| } |
| |
| public override long? Subtract(long? output, long? inc) |
| { |
| if (Debugging.AssertsEnabled) |
| { |
| Debugging.Assert(Valid(output)); |
| Debugging.Assert(Valid(inc)); |
| Debugging.Assert(output >= inc); |
| } |
| |
| if (inc == NO_OUTPUT) |
| { |
| return output; |
| } |
| else if (output.Equals(inc)) |
| { |
| return NO_OUTPUT; |
| } |
| else |
| { |
| return output - inc; |
| } |
| } |
| |
| public override long? Add(long? prefix, long? output) |
| { |
| if (Debugging.AssertsEnabled) |
| { |
| Debugging.Assert(Valid(prefix)); |
| Debugging.Assert(Valid(output)); |
| } |
| if (prefix == NO_OUTPUT) |
| { |
| return output; |
| } |
| else if (output == NO_OUTPUT) |
| { |
| return prefix; |
| } |
| else |
| { |
| return prefix + output; |
| } |
| } |
| |
| [MethodImpl(MethodImplOptions.AggressiveInlining)] |
| public override void Write(long? output, DataOutput @out) |
| { |
| if (Debugging.AssertsEnabled) Debugging.Assert(Valid(output)); |
| @out.WriteVInt64(output.Value); |
| } |
| |
| [MethodImpl(MethodImplOptions.AggressiveInlining)] |
| public override long? Read(DataInput @in) |
| { |
| long v = @in.ReadVInt64(); |
| if (v == 0) |
| { |
| return NO_OUTPUT; |
| } |
| else |
| { |
| return v; |
| } |
| } |
| |
| private bool Valid(long? o) |
| { |
| Debugging.Assert(o != null, "PositiveIntOutput precondition fail"); |
| Debugging.Assert(o == NO_OUTPUT || o > 0,"o={0}", o); |
| return true; |
| } |
| |
| public override long? NoOutput => NO_OUTPUT; |
| |
| [MethodImpl(MethodImplOptions.AggressiveInlining)] |
| public override string OutputToString(long? output) |
| { |
| return output.ToString(); // LUCENENET TODO: Invariant Culture? |
| } |
| |
| [MethodImpl(MethodImplOptions.AggressiveInlining)] |
| public override string ToString() |
| { |
| return "PositiveIntOutputs"; |
| } |
| } |
| } |