/*

* Copyright 2017 Google Inc. All rights reserved.

*

* 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.google.flatbuffers;

import static com.google.flatbuffers.Constants.*;

import java.nio.ByteBuffer;

/// @file

/// @addtogroup flatbuffers_java_api

/// @{

/**

* Class that collects utility functions around `ByteBuffer`.

*/

public class ByteBufferUtil {

/**

* Extract the size prefix from a `ByteBuffer`.

*

* @param bb a size-prefixed buffer

* @return the size prefix

*/

public static int getSizePrefix(ByteBuffer bb) {

return bb.getInt(bb.position());

}

/**

* Create a duplicate of a size-prefixed `ByteBuffer` that has its position

* advanced just past the size prefix.

*

* @param bb a size-prefixed buffer

* @return a new buffer on the same underlying data that has skipped the

* size prefix

*/

public static ByteBuffer removeSizePrefix(ByteBuffer bb) {

ByteBuffer s = bb.duplicate();

s.position(s.position() + SIZE_PREFIX_LENGTH);

return s;

}

}

/// @}