| /* |
| * 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.util; |
| |
| /** |
| * 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; |
| } |
| |
| } |