forked from apache/lucenenet
/
FieldValueFilter.cs
191 lines (172 loc) · 6.54 KB
/
FieldValueFilter.cs
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using Lucene.Net.Index;
using System;
namespace Lucene.Net.Search
{
/*
* 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 AtomicReaderContext = Lucene.Net.Index.AtomicReaderContext;
using IBits = Lucene.Net.Util.IBits;
using MatchAllBits = Lucene.Net.Util.Bits.MatchAllBits;
using MatchNoBits = Lucene.Net.Util.Bits.MatchNoBits;
/// <summary>
/// A <see cref="Filter"/> that accepts all documents that have one or more values in a
/// given field. this <see cref="Filter"/> request <see cref="IBits"/> from the
/// <see cref="IFieldCache"/> and build the bits if not present.
/// </summary>
public class FieldValueFilter : Filter
{
private readonly string field;
private readonly bool negate;
/// <summary>
/// Creates a new <see cref="FieldValueFilter"/>
/// </summary>
/// <param name="field">
/// The field to filter </param>
public FieldValueFilter(string field)
: this(field, false)
{
}
/// <summary>
/// Creates a new <see cref="FieldValueFilter"/>
/// </summary>
/// <param name="field">
/// The field to filter </param>
/// <param name="negate">
/// If <c>true</c> all documents with no value in the given
/// field are accepted.
/// </param>
public FieldValueFilter(string field, bool negate)
{
this.field = field;
this.negate = negate;
}
/// <summary>
/// Returns the field this filter is applied on. </summary>
/// <returns> The field this filter is applied on. </returns>
public virtual string Field
{
get { return field; }
}
/// <summary>
/// Returns <c>true</c> if this filter is negated, otherwise <c>false</c> </summary>
/// <returns> <c>true</c> if this filter is negated, otherwise <c>false</c> </returns>
public virtual bool Negate
{
get { return negate; }
}
public override DocIdSet GetDocIdSet(AtomicReaderContext context, IBits acceptDocs)
{
IBits docsWithField = FieldCache.DEFAULT.GetDocsWithField(((AtomicReader)context.Reader), field);
if (negate)
{
if (docsWithField is MatchAllBits)
{
return null;
}
return new FieldCacheDocIdSetAnonymousInnerClassHelper(this, context.AtomicReader.MaxDoc, acceptDocs, docsWithField);
}
else
{
if (docsWithField is MatchNoBits)
{
return null;
}
if (docsWithField is DocIdSet)
{
// UweSays: this is always the case for our current impl - but who knows
// :-)
return BitsFilteredDocIdSet.Wrap((DocIdSet)docsWithField, acceptDocs);
}
return new FieldCacheDocIdSetAnonymousInnerClassHelper2(this, context.AtomicReader.MaxDoc, acceptDocs, docsWithField);
}
}
private class FieldCacheDocIdSetAnonymousInnerClassHelper : FieldCacheDocIdSet
{
private readonly FieldValueFilter outerInstance;
private IBits docsWithField;
public FieldCacheDocIdSetAnonymousInnerClassHelper(FieldValueFilter outerInstance, int maxDoc, IBits acceptDocs, IBits docsWithField)
: base(maxDoc, acceptDocs)
{
this.outerInstance = outerInstance;
this.docsWithField = docsWithField;
}
protected internal override sealed bool MatchDoc(int doc)
{
return !docsWithField.Get(doc);
}
}
private class FieldCacheDocIdSetAnonymousInnerClassHelper2 : FieldCacheDocIdSet
{
private readonly FieldValueFilter outerInstance;
private readonly IBits docsWithField;
public FieldCacheDocIdSetAnonymousInnerClassHelper2(FieldValueFilter outerInstance, int maxDoc, IBits acceptDocs, IBits docsWithField)
: base(maxDoc, acceptDocs)
{
this.outerInstance = outerInstance;
this.docsWithField = docsWithField;
}
protected internal override sealed bool MatchDoc(int doc)
{
return docsWithField.Get(doc);
}
}
public override int GetHashCode()
{
const int prime = 31;
int result = 1;
result = prime * result + ((field == null) ? 0 : field.GetHashCode());
result = prime * result + (negate ? 1231 : 1237);
return result;
}
public override bool Equals(object obj)
{
if (this == obj)
{
return true;
}
if (obj == null)
{
return false;
}
if (this.GetType() != obj.GetType())
{
return false;
}
FieldValueFilter other = (FieldValueFilter)obj;
if (field == null)
{
if (other.field != null)
{
return false;
}
}
else if (!field.Equals(other.field, StringComparison.Ordinal))
{
return false;
}
if (negate != other.negate)
{
return false;
}
return true;
}
public override string ToString()
{
return "FieldValueFilter [field=" + field + ", negate=" + negate + "]";
}
}
}