/*
* Copyright 2004 The Apache Software Foundation
*
* Licensed 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 IndexReaderLucene.Net.Index.IndexReader;
using TermLucene.Net.Index.Term;
using TermPositionsLucene.Net.Index.TermPositions;
using ToStringUtilsLucene.Net.Util.ToStringUtils;
namespace Lucene.Net.Search.Spans{
/// <summary>Matches spans containing a term. </summary>
[Serializable]
public class SpanTermQuery:SpanQuery
{
private class AnonymousClassSpans : Spans
{
public AnonymousClassSpans(Lucene.Net.Index.IndexReader reader, SpanTermQuery enclosingInstance)
{
InitBlock(reader, enclosingInstance);
}
private void InitBlock(Lucene.Net.Index.IndexReader reader, SpanTermQuery enclosingInstance)
{
this.reader = reader;
this.enclosingInstance = enclosingInstance;
positions = reader.TermPositions(Enclosing_Instance.term);
}
private Lucene.Net.Index.IndexReader reader;
private SpanTermQuery enclosingInstance;
public SpanTermQuery Enclosing_Instance
{
get
{
return enclosingInstance;
}
}
private TermPositions positions;
private int doc = - 1;
private int freq;
private int count;
private int position;
public virtual bool Next()
{
if (count == freq)
{
if (!positions.Next())
{
doc = System.Int32.MaxValue;
return false;
}
doc = positions.Doc();
freq = positions.Freq();
count = 0;
}
position = positions.NextPosition();
count++;
return true;
}
public virtual bool SkipTo(int target)
{
// are we already at the correct position?
if (doc >= target)
{
return true;
}
if (!positions.SkipTo(target))
{
doc = System.Int32.MaxValue;
return false;
}
doc = positions.Doc();
freq = positions.Freq();
count = 0;
position = positions.NextPosition();
count++;
return true;
}
public virtual int Doc()
{
return doc;
}
public virtual int Start()
{
return position;
}
public virtual int End()
{
return position + 1;
}
public override System.String ToString()
{
return "spans(" + Enclosing_Instance.ToString() + ")@" + (doc == - 1?"START":((doc == System.Int32.MaxValue)?"END":doc + "-" + position));
}
}
private Term term;
/// <summary>Construct a SpanTermQuery matching the named term's spans. </summary>
public SpanTermQuery(Term term)
{
this.term = term;
}
/// <summary>Return the term whose spans are matched. </summary>
public virtual Term GetTerm()
{
return term;
}
public override System.String GetField()
{
return term.Field();
}
public override System.Collections.ICollection GetTerms()
{
System.Collections.ArrayList terms = new System.Collections.ArrayList();
terms.Add(term);
return terms;
}
public override System.String ToString(System.String field)
{
System.Text.StringBuilder buffer = new System.Text.StringBuilder();
if (term.Field().Equals(field))
buffer.Append(term.Text());
else
{
buffer.Append(term.ToString());
}
buffer.Append(ToStringUtils.Boost(GetBoost()));
return buffer.ToString();
}
/// <summary>Returns true iff <code>o</code> is equal to this. </summary>
public override bool Equals(System.Object o)
{
if (!(o is SpanTermQuery))
return false;
SpanTermQuery other = (SpanTermQuery) o;
return (this.GetBoost() == other.GetBoost()) && this.term.Equals(other.term);
}
/// <summary>Returns a hash code value for this object.</summary>
public override int GetHashCode()
{
return GetBoost().ToString().GetHashCode() ^ term.GetHashCode(); // {{Aroush-1.9}} Is this OK?
}
public override Spans GetSpans(IndexReader reader)
{
return new AnonymousClassSpans(reader, this);
}
}
}
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