org.apache.lucene.index.BitsSlice 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;
/**
* Exposes a slice of an existing Bits as a new Bits.
*
* @lucene.internal
*/
final class BitsSlice implements Bits {
private final Bits parent;
private final int start;
private final int length;
// start is inclusive; end is exclusive (length = end-start)
public BitsSlice(Bits parent, ReaderSlice slice) {
this.parent = parent;
this.start = slice.start;
this.length = slice.length;
assert length >= 0: "length=" + length;
}
@Override
public boolean get(int doc) {
if (doc >= length) {
throw new RuntimeException("doc " + doc + " is out of bounds 0 .. " + (length-1));
}
assert doc < length: "doc=" + doc + " length=" + length;
return parent.get(doc+start);
}
@Override
public int length() {
return length;
}
}