| /* |
| * 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; |
| |
| |
| /** |
| * Interface for Bitset-like structures. |
| * @lucene.experimental |
| */ |
| |
| public interface Bits { |
| /** |
| * Returns the value of the bit with the specified <code>index</code>. |
| * @param index index, should be non-negative and < {@link #length()}. |
| * The result of passing negative or out of bounds values is undefined |
| * by this interface, <b>just don't do it!</b> |
| * @return <code>true</code> if the bit is set, <code>false</code> otherwise. |
| */ |
| boolean get(int index); |
| |
| /** Returns the number of bits in this set */ |
| int length(); |
| |
| Bits[] EMPTY_ARRAY = new Bits[0]; |
| |
| /** |
| * Bits impl of the specified length with all bits set. |
| */ |
| class MatchAllBits implements Bits { |
| final int len; |
| |
| public MatchAllBits(int len) { |
| this.len = len; |
| } |
| |
| @Override |
| public boolean get(int index) { |
| return true; |
| } |
| |
| @Override |
| public int length() { |
| return len; |
| } |
| } |
| |
| /** |
| * Bits impl of the specified length with no bits set. |
| */ |
| class MatchNoBits implements Bits { |
| final int len; |
| |
| public MatchNoBits(int len) { |
| this.len = len; |
| } |
| |
| @Override |
| public boolean get(int index) { |
| return false; |
| } |
| |
| @Override |
| public int length() { |
| return len; |
| } |
| } |
| } |