| using J2N.Collections.Generic.Extensions; |
| using Lucene.Net.Diagnostics; |
| using System; |
| using System.Collections.Generic; |
| using System.Diagnostics; |
| |
| namespace Lucene.Net.Index |
| { |
| /* |
| * 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="IndexReaderContext"/> for <see cref="CompositeReader"/> instance. |
| /// </summary> |
| public sealed class CompositeReaderContext : IndexReaderContext |
| { |
| private readonly IList<IndexReaderContext> children; |
| private readonly IList<AtomicReaderContext> leaves; |
| private readonly CompositeReader reader; |
| |
| internal static CompositeReaderContext Create(CompositeReader reader) |
| { |
| return (new Builder(reader)).Build(); |
| } |
| |
| /// <summary> |
| /// Creates a <see cref="CompositeReaderContext"/> for intermediate readers that aren't |
| /// not top-level readers in the current context |
| /// </summary> |
| internal CompositeReaderContext(CompositeReaderContext parent, CompositeReader reader, int ordInParent, int docbaseInParent, IList<IndexReaderContext> children) |
| : this(parent, reader, ordInParent, docbaseInParent, children, null) |
| { |
| } |
| |
| /// <summary> |
| /// Creates a <see cref="CompositeReaderContext"/> for top-level readers with parent set to <c>null</c> |
| /// </summary> |
| internal CompositeReaderContext(CompositeReader reader, IList<IndexReaderContext> children, IList<AtomicReaderContext> leaves) |
| : this(null, reader, 0, 0, children, leaves) |
| { |
| } |
| |
| private CompositeReaderContext(CompositeReaderContext parent, CompositeReader reader, int ordInParent, int docbaseInParent, IList<IndexReaderContext> children, IList<AtomicReaderContext> leaves) |
| : base(parent, ordInParent, docbaseInParent) |
| { |
| this.children = children.AsReadOnly(); |
| this.leaves = leaves; |
| this.reader = reader; |
| } |
| |
| public override IList<AtomicReaderContext> Leaves |
| { |
| get |
| { |
| if (!IsTopLevel) |
| { |
| throw new NotSupportedException("this is not a top-level context."); |
| } |
| if (Debugging.AssertsEnabled) Debugging.Assert(leaves != null); |
| return leaves; |
| } |
| } |
| |
| public override IList<IndexReaderContext> Children => children; |
| |
| public override IndexReader Reader => reader; |
| |
| public sealed class Builder |
| { |
| private readonly CompositeReader reader; |
| private readonly IList<AtomicReaderContext> leaves = new List<AtomicReaderContext>(); |
| private int leafDocBase = 0; |
| |
| public Builder(CompositeReader reader) |
| { |
| this.reader = reader; |
| } |
| |
| public CompositeReaderContext Build() |
| { |
| return (CompositeReaderContext)Build(null, reader, 0, 0); |
| } |
| |
| internal IndexReaderContext Build(CompositeReaderContext parent, IndexReader reader, int ord, int docBase) |
| { |
| var ar = reader as AtomicReader; |
| if (ar != null) |
| { |
| var atomic = new AtomicReaderContext(parent, ar, ord, docBase, leaves.Count, leafDocBase); |
| leaves.Add(atomic); |
| leafDocBase += reader.MaxDoc; |
| return atomic; |
| } |
| else |
| { |
| CompositeReader cr = (CompositeReader)reader; |
| var sequentialSubReaders = cr.GetSequentialSubReaders(); |
| var children = new IndexReaderContext[sequentialSubReaders.Count]; |
| CompositeReaderContext newParent; |
| if (parent == null) |
| { |
| newParent = new CompositeReaderContext(cr, children, leaves); |
| } |
| else |
| { |
| newParent = new CompositeReaderContext(parent, cr, ord, docBase, children); |
| } |
| int newDocBase = 0; |
| for (int i = 0, c = sequentialSubReaders.Count; i < c; i++) |
| { |
| IndexReader r = sequentialSubReaders[i]; |
| children[i] = Build(newParent, r, i, newDocBase); |
| newDocBase += r.MaxDoc; |
| } |
| if (Debugging.AssertsEnabled) Debugging.Assert(newDocBase == cr.MaxDoc); |
| return newParent; |
| } |
| } |
| } |
| } |
| } |