client-common/src/main/java/org/apache/livy/client/common/BufferUtils.java

/*
 * 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 org.apache.livy.client.common;

import java.nio.ByteBuffer;

import org.apache.livy.annotations.Private;

/**
 * Utility methods for dealing with byte buffers and byte arrays.
 */
@Private
public class BufferUtils {

  public static byte[] toByteArray(ByteBuffer buf) {
    byte[] bytes;
    if (buf.hasArray() && buf.arrayOffset() == 0 &&
        buf.remaining() == buf.array().length) {
      bytes = buf.array();
    } else {
      bytes = new byte[buf.remaining()];
      buf.get(bytes);
    }
    return bytes;
  }

}