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DisjointSpatialFilter.cs
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DisjointSpatialFilter.cs
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using Lucene.Net.Index;
using Lucene.Net.Queries;
using Lucene.Net.Search;
using Lucene.Net.Spatial.Queries;
using Lucene.Net.Util;
using System;
using System.IO;
namespace Lucene.Net.Spatial
{
/*
* 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.
*/
/// <summary>
/// A Spatial Filter implementing <see cref="SpatialOperation.IsDisjointTo"/> in terms
/// of a <see cref="SpatialStrategy">SpatialStrategy</see>'s support for
/// <see cref="SpatialOperation.Intersects"/>.
/// A document is considered disjoint if it has spatial data that does not
/// intersect with the query shape. Another way of looking at this is that it's
/// a way to invert a query shape.
///
/// @lucene.experimental
/// </summary>
public class DisjointSpatialFilter : Filter
{
private readonly string field;//maybe null
private readonly Filter intersectsFilter;
/// <param name="strategy">Needed to compute intersects</param>
/// <param name="args">Used in spatial intersection</param>
/// <param name="field">
/// This field is used to determine which docs have spatial data via
/// <see cref="IFieldCache.GetDocsWithField(AtomicReader, string)"/>.
/// Passing null will assume all docs have spatial data.
/// </param>
public DisjointSpatialFilter(SpatialStrategy strategy, SpatialArgs args, string field)
{
this.field = field;
// TODO consider making SpatialArgs cloneable
SpatialOperation origOp = args.Operation; //copy so we can restore
args.Operation = SpatialOperation.Intersects; //temporarily set to intersects
intersectsFilter = strategy.MakeFilter(args);
args.Operation = origOp;
}
//restore so it looks like it was
public override bool Equals(object o)
{
if (this == o)
{
return true;
}
if (o == null || GetType() != o.GetType())
{
return false;
}
var that = (DisjointSpatialFilter)o;
if (field != null ? !field.Equals(that.field, StringComparison.Ordinal) : that.field != null)
{
return false;
}
if (!intersectsFilter.Equals(that.intersectsFilter))
{
return false;
}
return true;
}
public override int GetHashCode()
{
int result = field != null ? field.GetHashCode() : 0;
result = 31 * result + intersectsFilter.GetHashCode();
return result;
}
/// <exception cref="IOException"></exception>
public override DocIdSet GetDocIdSet(AtomicReaderContext context, IBits acceptDocs)
{
IBits docsWithField;
if (field == null)
{
docsWithField = null;
}
else
{
//NOTE By using the FieldCache we re-use a cache
// which is nice but loading it in this way might be slower than say using an
// intersects filter against the world bounds. So do we add a method to the
// strategy, perhaps? But the strategy can't cache it.
docsWithField = FieldCache.DEFAULT.GetDocsWithField((context.AtomicReader), field);
int maxDoc = context.AtomicReader.MaxDoc;
if (docsWithField.Length != maxDoc)
{
throw IllegalStateException.Create("Bits length should be maxDoc (" + maxDoc + ") but wasn't: " + docsWithField);
}
if (docsWithField is Bits.MatchNoBits)
{
return null;//match nothing
}
else if (docsWithField is Bits.MatchAllBits)
{
docsWithField = null;//all docs
}
}
//not so much a chain but a way to conveniently invert the Filter
DocIdSet docIdSet = new ChainedFilter(new Filter[] { intersectsFilter }, ChainedFilter.ANDNOT).GetDocIdSet(context, acceptDocs);
return BitsFilteredDocIdSet.Wrap(docIdSet, docsWithField);
}
}
}