| using Lucene.Net.Index; |
| using Lucene.Net.Util; |
| using System.Collections; |
| using System.Collections.Generic; |
| |
| namespace Lucene.Net.Queries.Function.ValueSources |
| { |
| /* |
| * 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> |
| /// <see cref="ValueSource"/> implementation which only returns the values from the provided |
| /// <see cref="ValueSource"/>s which are available for a particular docId. Consequently, when combined |
| /// with a <see cref="ConstValueSource"/>, this function serves as a way to return a default |
| /// value when the values for a field are unavailable. |
| /// </summary> |
| public class DefFunction : MultiFunction |
| { |
| public DefFunction(IList<ValueSource> sources) |
| : base(sources) |
| { |
| } |
| |
| protected override string Name => "def"; |
| |
| public override FunctionValues GetValues(IDictionary fcontext, AtomicReaderContext readerContext) |
| { |
| return new ValuesAnonymousInnerClassHelper(this, ValsArr(m_sources, fcontext, readerContext)); |
| } |
| |
| private class ValuesAnonymousInnerClassHelper : Values |
| { |
| private readonly DefFunction outerInstance; |
| |
| public ValuesAnonymousInnerClassHelper(DefFunction outerInstance, FunctionValues[] valsArr) |
| : base(outerInstance, valsArr) |
| { |
| this.outerInstance = outerInstance; |
| upto = valsArr.Length - 1; |
| } |
| |
| private readonly int upto; |
| |
| private FunctionValues Get(int doc) |
| { |
| for (int i = 0; i < upto; i++) |
| { |
| FunctionValues vals = valsArr[i]; |
| if (vals.Exists(doc)) |
| { |
| return vals; |
| } |
| } |
| return valsArr[upto]; |
| } |
| |
| public override byte ByteVal(int doc) |
| { |
| return Get(doc).ByteVal(doc); |
| } |
| |
| /// <summary> |
| /// NOTE: This was shortVal() in Lucene |
| /// </summary> |
| public override short Int16Val(int doc) |
| { |
| return Get(doc).Int16Val(doc); |
| } |
| |
| /// <summary> |
| /// NOTE: This was floatVal() in Lucene |
| /// </summary> |
| public override float SingleVal(int doc) |
| { |
| return Get(doc).SingleVal(doc); |
| } |
| |
| /// <summary> |
| /// NOTE: This was intVal() in Lucene |
| /// </summary> |
| public override int Int32Val(int doc) |
| { |
| return Get(doc).Int32Val(doc); |
| } |
| |
| /// <summary> |
| /// NOTE: This was longVal() in Lucene |
| /// </summary> |
| public override long Int64Val(int doc) |
| { |
| return Get(doc).Int64Val(doc); |
| } |
| |
| public override double DoubleVal(int doc) |
| { |
| return Get(doc).DoubleVal(doc); |
| } |
| |
| public override string StrVal(int doc) |
| { |
| return Get(doc).StrVal(doc); |
| } |
| |
| public override bool BoolVal(int doc) |
| { |
| return Get(doc).BoolVal(doc); |
| } |
| |
| public override bool BytesVal(int doc, BytesRef target) |
| { |
| return Get(doc).BytesVal(doc, target); |
| } |
| |
| public override object ObjectVal(int doc) |
| { |
| return Get(doc).ObjectVal(doc); |
| } |
| |
| public override bool Exists(int doc) |
| { |
| // return true if any source is exists? |
| foreach (FunctionValues vals in valsArr) |
| { |
| if (vals.Exists(doc)) |
| return true; |
| } |
| return false; |
| } |
| |
| public override ValueFiller GetValueFiller() |
| { |
| // TODO: need ValueSource.type() to determine correct type |
| return base.GetValueFiller(); |
| } |
| } |
| } |
| } |