PlainKeyword.cs

using System.Collections.Generic;
using System.Threading.Tasks;
 
namespace Waher.Persistence.FullTextSearch.Keywords
{
    public class PlainKeyword : Keyword
    {
        public PlainKeyword(string Keyword)
        {
            this.Keyword = Keyword;
            this.Ignore = string.IsNullOrEmpty(Keyword) ||
                FullTextSearchModule.IsStopWord(Keyword);
        }
 
        public string Keyword { get; }
 
        public override bool Ignore { get; }
 
        public override int OrderComplexity => this.Keyword.Length;
 
        public override bool Equals(object obj)
        {
            return obj is PlainKeyword k && this.Keyword == k.Keyword;
        }
 
        public override string ToString()
        {
            return this.Keyword;
        }
 
        public override async Task<IEnumerable<KeyValuePair<string, TokenReferences>>> GetTokenReferences(SearchProcess Process)
        {
            LinkedList<KeyValuePair<string, TokenReferences>> Result = new LinkedList<KeyValuePair<string, TokenReferences>>();
            KeyValuePair<string, object>[] Records = await Process.Index.GetEntriesAsync(this.Keyword, this.Keyword + "!");
 
            foreach (KeyValuePair<string, object> Rec in Records)
            {
                if (Rec.Value is TokenReferences References)
                    Result.AddLast(new KeyValuePair<string, TokenReferences>(this.Keyword, References));
            }
 
            return Result;
        }
    }
}