com.netflix.zeno.fastblob.record.ByteDataBuffer Maven / Gradle / Ivy

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/*
 *
 *  Copyright 2013 Netflix, Inc.
 *
 *     Licensed 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.netflix.zeno.fastblob.record;

/**
 * Writes data to a SegmentedByteArray, tracking the index to which it writes.
 *
 * @author dkoszewnik
 *
 */
public class ByteDataBuffer {

    private final SegmentedByteArray buf;
    private int position;

    public ByteDataBuffer() {
        this(256);
    }

    public ByteDataBuffer(int startSize) {
        int log2OfSize = 32 - Integer.numberOfLeadingZeros(startSize - 1);
        buf = new SegmentedByteArray(log2OfSize - 1);
    }

    public void write(byte b) {
        buf.set(position++, b);
    }

    public void reset() {
        position = 0;
    }

    public void setPosition(int position) {
        this.position = position;
    }

    public int length() {
        return position;
    }

    public void copyTo(ByteDataBuffer other) {
        for(int i=0;i