computer-core/src/main/java/com/baidu/hugegraph/computer/core/store/file/hgkvfile/builder/DataBlockBuilderImpl.java

/*
 * 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.hgkvfile.builder;

import java.io.IOException;

import com.baidu.hugegraph.computer.core.io.RandomAccessOutput;
import com.baidu.hugegraph.computer.core.store.entry.KvEntry;

public class DataBlockBuilderImpl implements BlockBuilder {

    private final RandomAccessOutput output;
    private long entriesBytes;

    public DataBlockBuilderImpl(RandomAccessOutput output) {
        this.output = output;
        this.entriesBytes = 0L;
    }

    @Override
    public void add(KvEntry entry) throws IOException {
        entry.key().write(this.output);
        entry.value().write(this.output);
        this.entriesBytes += this.sizeOfEntry(entry);
    }

    @Override
    public long sizeOfEntry(KvEntry entry) {
        long keyLength = Integer.BYTES + entry.key().length();
        long valueLength = Integer.BYTES + entry.value().length();
        return keyLength + valueLength;
    }

    @Override
    public long size() {
        return this.entriesBytes;
    }

    @Override
    public void finish() {
        // pass
    }

    @Override
    public void reset() {
        this.entriesBytes = 0L;
    }
}