org.apache.lucene.index.MultiBits 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 org.apache.lucene.util.Bits;
/**
* Concatenates multiple Bits together, on every lookup.
*
* NOTE: This is very costly, as every lookup must
* do a binary search to locate the right sub-reader.
*
* @lucene.experimental
*/
final class MultiBits implements Bits {
private final Bits[] subs;
// length is 1+subs.length (the last entry has the maxDoc):
private final int[] starts;
private final boolean defaultValue;
public MultiBits(Bits[] subs, int[] starts, boolean defaultValue) {
assert starts.length == 1+subs.length;
this.subs = subs;
this.starts = starts;
this.defaultValue = defaultValue;
}
private boolean checkLength(int reader, int doc) {
final int length = starts[1+reader]-starts[reader];
assert doc - starts[reader] < length: "doc=" + doc + " reader=" + reader + " starts[reader]=" + starts[reader] + " length=" + length;
return true;
}
@Override
public boolean get(int doc) {
final int reader = ReaderUtil.subIndex(doc, starts);
assert reader != -1;
final Bits bits = subs[reader];
if (bits == null) {
return defaultValue;
} else {
assert checkLength(reader, doc);
return bits.get(doc-starts[reader]);
}
}
@Override
public String toString() {
StringBuilder b = new StringBuilder();
b.append(subs.length + " subs: ");
for(int i=0;i-->