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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 FieldCache = Lucene.Net.Search.FieldCache;
namespace Lucene.Net.Search.Function
{
/// <summary> Expert: obtains single byte field values from the
/// <see cref="Lucene.Net.Search.FieldCache">FieldCache</see>
/// using <c>getBytes()</c> and makes those values
/// available as other numeric types, casting as needed.
///
/// <p/><font color="#FF0000">
/// WARNING: The status of the <b>Search.Function</b> package is experimental.
/// The APIs introduced here might change in the future and will not be
/// supported anymore in such a case.</font>
///
/// </summary>
/// <seealso cref="Lucene.Net.Search.Function.FieldCacheSource"> for requirements"
/// on the field.
///
/// <p/><b>NOTE</b>: with the switch in 2.9 to segment-based
/// searching, if <see cref="FieldCacheSource.GetValues" /> is invoked with a
/// composite (multi-segment) reader, this can easily cause
/// double RAM usage for the values in the FieldCache. It's
/// best to switch your application to pass only atomic
/// (single segment) readers to this API.<p/>
/// </seealso>
[Serializable]
public class ByteFieldSource:FieldCacheSource
{
private class AnonymousClassDocValues:DocValues
{
public AnonymousClassDocValues(sbyte[] arr, ByteFieldSource enclosingInstance)
{
InitBlock(arr, enclosingInstance);
}
private void InitBlock(sbyte[] arr, ByteFieldSource enclosingInstance)
{
this.arr = arr;
this.enclosingInstance = enclosingInstance;
}
private sbyte[] arr;
private ByteFieldSource enclosingInstance;
public ByteFieldSource Enclosing_Instance
{
get
{
return enclosingInstance;
}
}
/*(non-Javadoc) <see cref="Lucene.Net.Search.Function.DocValues.floatVal(int) */
public override float FloatVal(int doc)
{
return (float) arr[doc];
}
/*(non-Javadoc) <see cref="Lucene.Net.Search.Function.DocValues.intVal(int) */
public override int IntVal(int doc)
{
return arr[doc];
}
/*(non-Javadoc) <see cref="Lucene.Net.Search.Function.DocValues.toString(int) */
public override System.String ToString(int doc)
{
return Enclosing_Instance.Description() + '=' + IntVal(doc);
}
/*(non-Javadoc) <see cref="Lucene.Net.Search.Function.DocValues.getInnerArray() */
protected internal override object InnerArray
{
get { return arr; }
}
}
private Lucene.Net.Search.ByteParser parser;
/// <summary> Create a cached byte field source with default string-to-byte parser. </summary>
public ByteFieldSource(System.String field):this(field, null)
{
}
/// <summary> Create a cached byte field source with a specific string-to-byte parser. </summary>
public ByteFieldSource(System.String field, Lucene.Net.Search.ByteParser parser):base(field)
{
this.parser = parser;
}
/*(non-Javadoc) <see cref="Lucene.Net.Search.Function.ValueSource.description() */
public override System.String Description()
{
return "byte(" + base.Description() + ')';
}
/*(non-Javadoc) <see cref="Lucene.Net.Search.Function.FieldCacheSource.getCachedValues(Lucene.Net.Search.FieldCache, java.lang.String, Lucene.Net.Index.IndexReader) */
public override DocValues GetCachedFieldValues(FieldCache cache, System.String field, IndexReader reader)
{
sbyte[] arr = cache.GetBytes(reader, field, parser);
return new AnonymousClassDocValues(arr, this);
}
/*(non-Javadoc) <see cref="Lucene.Net.Search.Function.FieldCacheSource.cachedFieldSourceEquals(Lucene.Net.Search.Function.FieldCacheSource) */
public override bool CachedFieldSourceEquals(FieldCacheSource o)
{
if (o.GetType() != typeof(ByteFieldSource))
{
return false;
}
ByteFieldSource other = (ByteFieldSource) o;
return this.parser == null?other.parser == null:this.parser.GetType() == other.parser.GetType();
}
/*(non-Javadoc) <see cref="Lucene.Net.Search.Function.FieldCacheSource.cachedFieldSourceHashCode() */
public override int CachedFieldSourceHashCode()
{
return parser == null?typeof(System.SByte).GetHashCode():parser.GetType().GetHashCode();
}
}
}
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