| /* |
| * 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.bufferfile; |
| |
| import java.io.File; |
| import java.io.IOException; |
| |
| import com.baidu.hugegraph.computer.core.common.exception.ComputerException; |
| import com.baidu.hugegraph.computer.core.io.IOFactory; |
| import com.baidu.hugegraph.computer.core.io.RandomAccessInput; |
| import com.baidu.hugegraph.computer.core.store.KvEntryFileReader; |
| import com.baidu.hugegraph.computer.core.store.EntryIterator; |
| import com.baidu.hugegraph.computer.core.store.entry.EntriesUtil; |
| import com.baidu.hugegraph.computer.core.store.entry.KvEntry; |
| |
| public class BufferFileSubEntryReader implements KvEntryFileReader { |
| |
| private final File file; |
| |
| public BufferFileSubEntryReader(String path) { |
| this.file = new File(path); |
| } |
| |
| @Override |
| public EntryIterator iterator() { |
| return new BufferFileSubEntryReader.EntryIter(); |
| } |
| |
| private class EntryIter implements EntryIterator { |
| |
| public final RandomAccessInput input; |
| private final RandomAccessInput userAccessInput; |
| |
| public EntryIter() { |
| try { |
| this.input = IOFactory.createFileInput( |
| BufferFileSubEntryReader.this.file); |
| this.userAccessInput = this.input.duplicate(); |
| } catch (IOException e) { |
| throw new ComputerException(e.getMessage(), e); |
| } |
| } |
| |
| @Override |
| public void close() throws Exception { |
| this.input.close(); |
| this.userAccessInput.close(); |
| } |
| |
| @Override |
| public boolean hasNext() { |
| try { |
| return this.input.available() > 0; |
| } catch (IOException e) { |
| throw new ComputerException(e.getMessage(), e); |
| } |
| } |
| |
| @Override |
| public KvEntry next() { |
| return EntriesUtil.subKvEntryFromInput(this.input, |
| this.userAccessInput, |
| true); |
| } |
| } |
| } |