org.apache.lucene.index.LeafReaderContext Maven / Gradle / Ivy
/*
* 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.
*/
package org.apache.lucene.index;
import java.util.Collections;
import java.util.List;
/**
* {@link IndexReaderContext} for {@link LeafReader} instances.
*/
public final class LeafReaderContext extends IndexReaderContext {
/** The readers ord in the top-level's leaves array */
public final int ord;
/** The readers absolute doc base */
public final int docBase;
private final LeafReader reader;
private final List leaves;
/**
* Creates a new {@link LeafReaderContext}
*/
LeafReaderContext(CompositeReaderContext parent, LeafReader reader,
int ord, int docBase, int leafOrd, int leafDocBase) {
super(parent, ord, docBase);
this.ord = leafOrd;
this.docBase = leafDocBase;
this.reader = reader;
this.leaves = isTopLevel ? Collections.singletonList(this) : null;
}
LeafReaderContext(LeafReader leafReader) {
this(null, leafReader, 0, 0, 0, 0);
}
@Override
public List leaves() {
if (!isTopLevel) {
throw new UnsupportedOperationException("This is not a top-level context.");
}
assert leaves != null;
return leaves;
}
@Override
public List children() {
return null;
}
@Override
public LeafReader reader() {
return reader;
}
@Override
public String toString() {
return "LeafReaderContext(" + reader + " docBase=" + docBase + " ord=" + ord + ")";
}
}