SpanTermQuery.cs

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/* 
 * 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 System;

using IndexReader = Lucene.Net.Index.IndexReader;
using Term = Lucene.Net.Index.Term;
using ToStringUtils = Lucene.Net.Util.ToStringUtils;

namespace Lucene.Net.Search.Spans
{
    
    /// <summary>Matches spans containing a term. </summary>
    [Serializable]
    public class SpanTermQuery:SpanQuery
    {
        protected internal Term internalTerm;
        
        /// <summary>Construct a SpanTermQuery matching the named term's spans. </summary>
        public SpanTermQuery(Term term)
        {
            this.internalTerm = term;
        }

        /// <summary>Return the term whose spans are matched. </summary>
        public virtual Term Term
        {
            get { return internalTerm; }
        }

        public override string Field
        {
            get { return internalTerm.Field; }
        }

        public override void  ExtractTerms(System.Collections.Generic.ISet<Term> terms)
        {
            terms.Add(internalTerm);
        }
        
        public override System.String ToString(System.String field)
        {
            System.Text.StringBuilder buffer = new System.Text.StringBuilder();
            if (internalTerm.Field.Equals(field))
                buffer.Append(internalTerm.Text);
            else
            {
                buffer.Append(internalTerm.ToString());
            }
            buffer.Append(ToStringUtils.Boost(Boost));
            return buffer.ToString();
        }
        
        public override int GetHashCode()
        {
            int prime = 31;
            int result = base.GetHashCode();
            result = prime * result + ((internalTerm == null)?0:internalTerm.GetHashCode());
            return result;
        }
        
        public  override bool Equals(System.Object obj)
        {
            if (this == obj)
                return true;
            if (!base.Equals(obj))
                return false;
            if (GetType() != obj.GetType())
                return false;
            SpanTermQuery other = (SpanTermQuery) obj;
            if (internalTerm == null)
            {
                if (other.internalTerm != null)
                    return false;
            }
            else if (!internalTerm.Equals(other.internalTerm))
                return false;
            return true;
        }
        
        public override Spans GetSpans(IndexReader reader)
        {
            return new TermSpans(reader.TermPositions(internalTerm), internalTerm);
        }
    }
}