| /* |
| * Copyright 2017 HugeGraph Authors |
| * |
| * 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 com.baidu.hugegraph.computer.core.store.file.seqfile; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import com.baidu.hugegraph.computer.core.config.Config; |
| |
| public class BitsFileReaderImpl implements BitsFileReader { |
| |
| private static final int BUFFER_BITS = Long.BYTES << 3; |
| |
| private final ValueFileInput input; |
| private boolean closed; |
| private long byteBuffer; |
| private int cursor; |
| |
| public BitsFileReaderImpl(Config config, String path) throws IOException { |
| this(config, new File(path)); |
| } |
| |
| public BitsFileReaderImpl(Config config, File file) throws IOException { |
| this.input = new ValueFileInput(config, file); |
| this.closed = false; |
| |
| this.byteBuffer = this.input.readLong(); |
| this.cursor = 0; |
| } |
| |
| @Override |
| public boolean readBoolean() throws IOException { |
| if (this.cursor >= BUFFER_BITS) { |
| this.byteBuffer = this.input.readLong(); |
| this.cursor = 0; |
| } |
| |
| return (this.byteBuffer >> this.cursor++ & 1) == 1; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| if (this.closed) { |
| return; |
| } |
| this.closed = true; |
| this.input.close(); |
| } |
| } |