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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.io;
import java.nio.ByteBuffer;
/**
* A Blob contains opaque data in the form of a byte array.
**/
public class Blob {
/**
* Shared empty array.
**/
private static byte[] empty = new byte[0];
/**
* Internal data, will never be 'null'.
**/
private byte[] data;
/**
* Create a Blob containing an empty byte array.
**/
public Blob() {
data = empty;
}
/**
* Create a Blob containg a copy of a subset of the given byte
* array.
**/
public Blob(byte[] src, int offset, int length) {
data = new byte[length];
System.arraycopy(src, offset, data, 0, length);
}
/**
* Create a Blob containing a copy of the given byte array.
**/
public Blob(byte[] src) {
this(src, 0, src.length);
}
/**
* Create a Blob containing a copy of the data held by the given
* blob.
**/
public Blob(Blob src) {
this(src.data);
}
/**
* Create a Blob containing a number of bytes read from a byte
* buffer.
**/
public Blob(ByteBuffer src, int length) {
data = new byte[length];
src.get(data);
}
/**
* Create a Blob containing all bytes that could be read from a
* byte buffer.
**/
public Blob(ByteBuffer src) {
this(src, src.remaining());
}
/**
* Obtain the internal data held by this object.
*
* @return internal data
**/
public byte[] get() {
return data;
}
/**
* Write the data held by this object to the given byte buffer.
*
* @param dst where to write the contained data
**/
public void write(ByteBuffer dst) {
dst.put(data);
}
}
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