| /* |
| * 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.hgkvfile.entry; |
| |
| import java.io.IOException; |
| |
| import com.baidu.hugegraph.computer.core.io.RandomAccessOutput; |
| import com.baidu.hugegraph.computer.core.io.Writable; |
| |
| public class EntryOutputImpl implements EntryOutput { |
| |
| private final RandomAccessOutput output; |
| private final boolean needSortSubKv; |
| |
| public EntryOutputImpl(RandomAccessOutput output, |
| boolean needSortSubKv) { |
| this.output = output; |
| this.needSortSubKv = needSortSubKv; |
| } |
| |
| public EntryOutputImpl(RandomAccessOutput output) { |
| this(output, true); |
| } |
| |
| @Override |
| public KvEntryWriter writeEntry(Writable key) throws IOException { |
| // Write key |
| this.writeData(key); |
| return new KvEntryWriterImpl(this.output, this.needSortSubKv); |
| } |
| |
| @Override |
| public void writeEntry(Writable key, Writable value) throws IOException { |
| // Write key |
| this.writeData(key); |
| // Write value |
| this.writeData(value); |
| } |
| |
| private void writeData(Writable data) throws IOException { |
| // Write data length placeholder |
| this.output.writeFixedInt(0); |
| long position = this.output.position(); |
| // Write data |
| data.write(this.output); |
| // Fill data length placeholder |
| int dataLength = (int) (this.output.position() - position); |
| this.output.writeFixedInt(position - Integer.BYTES, dataLength); |
| } |
| } |