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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 ToStringUtils = Lucene.Net.Util.ToStringUtils;
namespace Lucene.Net.Search
{
/// <summary> A query that matches all documents.
///
/// </summary>
/// <author> John Wang
/// </author>
[Serializable]
public class MatchAllDocsQuery : Query
{
public MatchAllDocsQuery()
{
}
private class MatchAllScorer : Scorer
{
private void InitBlock(MatchAllDocsQuery enclosingInstance)
{
this.enclosingInstance = enclosingInstance;
}
private MatchAllDocsQuery enclosingInstance;
public MatchAllDocsQuery Enclosing_Instance
{
get
{
return enclosingInstance;
}
}
internal IndexReader reader;
internal int id;
internal int maxId;
internal float score;
internal MatchAllScorer(MatchAllDocsQuery enclosingInstance, IndexReader reader, Similarity similarity, Weight w):base(similarity)
{
InitBlock(enclosingInstance);
this.reader = reader;
id = - 1;
maxId = reader.MaxDoc() - 1;
score = w.GetValue();
}
public override Explanation Explain(int doc)
{
return null; // not called... see MatchAllDocsWeight.explain()
}
public override int Doc()
{
return id;
}
public override bool Next()
{
while (id < maxId)
{
id++;
if (!reader.IsDeleted(id))
{
return true;
}
}
return false;
}
public override float Score()
{
return score;
}
public override bool SkipTo(int target)
{
id = target - 1;
return Next();
}
}
[Serializable]
private class MatchAllDocsWeight : Weight
{
private void InitBlock(MatchAllDocsQuery enclosingInstance)
{
this.enclosingInstance = enclosingInstance;
}
private MatchAllDocsQuery enclosingInstance;
public MatchAllDocsQuery Enclosing_Instance
{
get
{
return enclosingInstance;
}
}
private Similarity similarity;
private float queryWeight;
private float queryNorm;
public MatchAllDocsWeight(MatchAllDocsQuery enclosingInstance, Searcher searcher)
{
InitBlock(enclosingInstance);
this.similarity = searcher.GetSimilarity();
}
public override System.String ToString()
{
return "weight(" + Enclosing_Instance + ")";
}
public virtual Query GetQuery()
{
return Enclosing_Instance;
}
public virtual float GetValue()
{
return queryWeight;
}
public virtual float SumOfSquaredWeights()
{
queryWeight = Enclosing_Instance.GetBoost();
return queryWeight * queryWeight;
}
public virtual void Normalize(float queryNorm)
{
this.queryNorm = queryNorm;
queryWeight *= this.queryNorm;
}
public virtual Scorer Scorer(IndexReader reader)
{
return new MatchAllScorer(enclosingInstance, reader, similarity, this);
}
public virtual Explanation Explain(IndexReader reader, int doc)
{
// explain query weight
Explanation queryExpl = new ComplexExplanation(true, GetValue(), "MatchAllDocsQuery, product of:");
if (Enclosing_Instance.GetBoost() != 1.0f)
{
queryExpl.AddDetail(new Explanation(Enclosing_Instance.GetBoost(), "boost"));
}
queryExpl.AddDetail(new Explanation(queryNorm, "queryNorm"));
return queryExpl;
}
}
protected internal override Weight CreateWeight(Searcher searcher)
{
return new MatchAllDocsWeight(this, searcher);
}
public override void ExtractTerms(System.Collections.Hashtable terms)
{
}
public override System.String ToString(System.String field)
{
System.Text.StringBuilder buffer = new System.Text.StringBuilder();
buffer.Append("MatchAllDocsQuery");
buffer.Append(ToStringUtils.Boost(GetBoost()));
return buffer.ToString();
}
public override bool Equals(System.Object o)
{
if (!(o is MatchAllDocsQuery))
return false;
MatchAllDocsQuery other = (MatchAllDocsQuery) o;
return this.GetBoost() == other.GetBoost();
}
public override int GetHashCode()
{
return BitConverter.ToInt32(BitConverter.GetBytes(GetBoost()), 0) ^ 0x1AA71190;
}
}
}
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