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The Open Source version of the IBM Toolbox for Java

There is a newer version: 11.1

///////////////////////////////////////////////////////////////////////////////
//
// JTOpenLite
//
// Filename:  ByteArrayKey.java
//
// The source code contained herein is licensed under the IBM Public License
// Version 1.0, which has been approved by the Open Source Initiative.
// Copyright (C) 2011-2012 International Business Machines Corporation and
// others.  All rights reserved.
//
///////////////////////////////////////////////////////////////////////////////

package com.ibm.jtopenlite;

/**
 * Utility class for mapping byte array portions.
**/
public final class ByteArrayKey
{
  private byte[] key_;
  private int offset_;
  private int length_;
  private int hash_;

  public ByteArrayKey()
  {
  }

  public ByteArrayKey(final byte[] key)
  {
    key_ = key;
    offset_ = 0;
    length_ = key.length;
    hash_ = computeHash(key, 0, key.length);
  }

  private static final int computeHash(final byte[] key, final int offset, final int length)
  {
/*    int hash = 0;
    for (int i=0; i 4)
    {
      for (int i=length_-4; i> 1)];
  }

  public void setHashData(final byte[] data, final int offset, final int length)
  {
    key_ = data;
    offset_ = offset;
    length_ = length;
    hash_ = computeHash(data, offset, length);
  }

  public int hashCode()
  {
    return hash_;
  }

  public boolean equals(Object obj)
  {
    if (obj != null && obj instanceof ByteArrayKey)
    {
      ByteArrayKey e = (ByteArrayKey)obj;
      return this.matches(e.key_, e.offset_, e.length_);
    }
    return false;
  }

  public byte[] getKey()
  {
    return key_;
  }

  public int getOffset()
  {
    return offset_;
  }

  public int getLength()
  {
    return length_;
  }

  public boolean matches(final byte[] data, final int offset, final int length)
  {
    if (length_ != length) return false;
    for (int i=0; i