| package org.apache.lucene.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. |
| */ |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.List; |
| |
| /** |
| * {@link IndexReaderContext} for {@link CompositeReader} instance. |
| */ |
| public final class CompositeReaderContext extends IndexReaderContext { |
| private final List<IndexReaderContext> children; |
| private final List<AtomicReaderContext> leaves; |
| private final CompositeReader reader; |
| |
| static CompositeReaderContext create(CompositeReader reader) { |
| return new Builder(reader).build(); |
| } |
| |
| /** |
| * Creates a {@link CompositeReaderContext} for intermediate readers that aren't |
| * not top-level readers in the current context |
| */ |
| CompositeReaderContext(CompositeReaderContext parent, CompositeReader reader, |
| int ordInParent, int docbaseInParent, List<IndexReaderContext> children) { |
| this(parent, reader, ordInParent, docbaseInParent, children, null); |
| } |
| |
| /** |
| * Creates a {@link CompositeReaderContext} for top-level readers with parent set to <code>null</code> |
| */ |
| CompositeReaderContext(CompositeReader reader, List<IndexReaderContext> children, List<AtomicReaderContext> leaves) { |
| this(null, reader, 0, 0, children, leaves); |
| } |
| |
| private CompositeReaderContext(CompositeReaderContext parent, CompositeReader reader, |
| int ordInParent, int docbaseInParent, List<IndexReaderContext> children, |
| List<AtomicReaderContext> leaves) { |
| super(parent, ordInParent, docbaseInParent); |
| this.children = Collections.unmodifiableList(children); |
| this.leaves = leaves == null ? null : Collections.unmodifiableList(leaves); |
| this.reader = reader; |
| } |
| |
| @Override |
| public List<AtomicReaderContext> leaves() throws UnsupportedOperationException { |
| if (!isTopLevel) |
| throw new UnsupportedOperationException("This is not a top-level context."); |
| assert leaves != null; |
| return leaves; |
| } |
| |
| |
| @Override |
| public List<IndexReaderContext> children() { |
| return children; |
| } |
| |
| @Override |
| public CompositeReader reader() { |
| return reader; |
| } |
| |
| private static final class Builder { |
| private final CompositeReader reader; |
| private final List<AtomicReaderContext> leaves = new ArrayList<AtomicReaderContext>(); |
| private int leafDocBase = 0; |
| |
| public Builder(CompositeReader reader) { |
| this.reader = reader; |
| } |
| |
| public CompositeReaderContext build() { |
| return (CompositeReaderContext) build(null, reader, 0, 0); |
| } |
| |
| private IndexReaderContext build(CompositeReaderContext parent, IndexReader reader, int ord, int docBase) { |
| if (reader instanceof AtomicReader) { |
| final AtomicReader ar = (AtomicReader) reader; |
| final AtomicReaderContext atomic = new AtomicReaderContext(parent, ar, ord, docBase, leaves.size(), leafDocBase); |
| leaves.add(atomic); |
| leafDocBase += reader.maxDoc(); |
| return atomic; |
| } else { |
| final CompositeReader cr = (CompositeReader) reader; |
| final List<? extends IndexReader> sequentialSubReaders = cr.getSequentialSubReaders(); |
| final List<IndexReaderContext> children = Arrays.asList(new IndexReaderContext[sequentialSubReaders.size()]); |
| final 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.size(); i < c; i++) { |
| final IndexReader r = sequentialSubReaders.get(i); |
| children.set(i, build(newParent, r, i, newDocBase)); |
| newDocBase += r.maxDoc(); |
| } |
| assert newDocBase == cr.maxDoc(); |
| return newParent; |
| } |
| } |
| } |
| |
| } |