/*
 * 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
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 */
package org.apache.lucene.util;

Immutable twin of FixedBitSet.
/** * Immutable twin of FixedBitSet. */
final class FixedBits implements Bits { final long[] bits; final int length; FixedBits(long[] bits, int length) { this.bits = bits; this.length = length; } @Override public boolean get(int index) { assert index >= 0 && index < length: "index=" + index + ", numBits=" + length; int i = index >> 6; // div 64 // signed shift will keep a negative index and force an // array-index-out-of-bounds-exception, removing the need for an explicit check. long bitmask = 1L << index; return (bits[i] & bitmask) != 0; } @Override public int length() { return length; } }