content: /*
   * Copyright 2019 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 java.nio.ByteBuffer;
  
  /// @cond FLATBUFFERS_INTERNAL
  
  /**
   * All vector access objects derive from this class, and add their own accessors.
   */
  public class BaseVector {
    /** Used to hold the vector data position. */
    private int vector;
    /** Used to hold the vector size. */
    private int length;
    /** Used to hold the vector element size in table. */
    private int element_size;
    /** The underlying ByteBuffer to hold the data of the vector. */
    protected ByteBuffer bb;
  
    /**
     * Get the start data of a vector.
     *
     * @return Returns the start of the vector data.
     */
    protected int __vector() {
      return vector;
    }
  
    /**
     * Gets the element position in vector's ByteBuffer.
     *
     * @param j An `int` index of element into a vector.
     * @return Returns the position of the vector element in a ByteBuffer.
     */
    protected int __element(int j) {
      return vector + j * element_size;
    }
  
    /**
     * Re-init the internal state with an external buffer {@code ByteBuffer}, an offset within and
     * element size.
     *
     * This method exists primarily to allow recycling vector instances without risking memory leaks
     * due to {@code ByteBuffer} references.
     */
    protected void __reset(int _vector, int _element_size, ByteBuffer _bb) { 
      bb = _bb;
      if (bb != null) {
        vector = _vector;
        length = bb.getInt(_vector - Constants.SIZEOF_INT);
        element_size = _element_size;
      } else {
        vector = 0;
        length = 0;
        element_size = 0;
      }
    }
  
    /**
     * Resets the internal state with a null {@code ByteBuffer} and a zero position.
     *
     * This method exists primarily to allow recycling vector instances without risking memory leaks
     * due to {@code ByteBuffer} references. The instance will be unusable until it is assigned
     * again to a {@code ByteBuffer}.
     */
    public void reset() {
      __reset(0, 0, null);
    }
  
    /**
     * Get the length of a vector.
     *
     * @return Returns the length of the vector.
     */
    public int length() {
      return length;
    }
  }
  
  /// @endcond
  