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StrDocValues.cs
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StrDocValues.cs
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using Lucene.Net.Util.Mutable;
namespace Lucene.Net.Queries.Function.DocValues
{
/*
* 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>
/// Abstract <see cref="FunctionValues"/> implementation which supports retrieving <see cref="string"/> values.
/// Implementations can control how the <see cref="string"/> values are loaded through <see cref="StrVal(int)"/>
/// </summary>
public abstract class StrDocValues : FunctionValues
{
protected readonly ValueSource m_vs;
public StrDocValues(ValueSource vs)
{
this.m_vs = vs;
}
public override abstract string StrVal(int doc);
public override object ObjectVal(int doc)
{
return Exists(doc) ? StrVal(doc) : null;
}
public override bool BoolVal(int doc)
{
return Exists(doc);
}
public override string ToString(int doc)
{
return m_vs.GetDescription() + "='" + StrVal(doc) + "'";
}
public override ValueFiller GetValueFiller()
{
return new ValueFillerAnonymousInnerClassHelper(this);
}
private class ValueFillerAnonymousInnerClassHelper : ValueFiller
{
private readonly StrDocValues outerInstance;
public ValueFillerAnonymousInnerClassHelper(StrDocValues outerInstance)
{
this.outerInstance = outerInstance;
mval = new MutableValueStr();
}
private readonly MutableValueStr mval;
public override MutableValue Value
{
get
{
return mval;
}
}
public override void FillValue(int doc)
{
mval.Exists = outerInstance.BytesVal(doc, mval.Value);
}
}
}
}