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    1   /*
    2    *  Licensed to the Apache Software Foundation (ASF) under one
    3    *  or more contributor license agreements.  See the NOTICE file
    4    *  distributed with this work for additional information
    5    *  regarding copyright ownership.  The ASF licenses this file
    6    *  to you under the Apache License, Version 2.0 (the
    7    *  "License"); you may not use this file except in compliance
    8    *  with the License.  You may obtain a copy of the License at
    9    *
    10   *    http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   *  Unless required by applicable law or agreed to in writing,
    13   *  software distributed under the License is distributed on an
    14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    15   *  KIND, either express or implied.  See the License for the
    16   *  specific language governing permissions and limitations
    17   *  under the License.
    18   *
    19   */
    20  package org.apache.mina.util.byteaccess;
    21
    22  /**
    23   *
    24   * Abstract class that implements {@link ByteArray}.  This class will only be
    25   * used internally and should not be used by end users.
    26   *
    27   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
    28   */
    29  abstract class AbstractByteArray implements ByteArray {
    30
    31      /**
    32       * @inheritDoc
    33       */
    34      public final int length() {
    35          return last() - first();
    36      }
    37
    38      /**
    39       * @inheritDoc
    40       */
    41      @Override
    42      public final boolean equals(Object other) {
    43          // Optimization: compare pointers.
    44          if (other == this) {
    45              return true;
    46          }
    47          // Compare types.
    48          if (!(other instanceof ByteArray)) {
    49              return false;
    50          }
    51          ByteArray otherByteArray = (ByteArray) other;
    52          // Compare properties.
    53          if (first() != otherByteArray.first() || last() != otherByteArray.last()
    54                  || !order().equals(otherByteArray.order())) {
    55              return false;
    56          }
    57          // Compare bytes.
    58          Cursor cursor = cursor();
    59          Cursor otherCursor = otherByteArray.cursor();
    60          for (int remaining = cursor.getRemaining(); remaining > 0;) {
    61              // Optimization: prefer int comparisons over byte comparisons
    62              if (remaining >= 4) {
    63                  int i = cursor.getInt();
    64                  int otherI = otherCursor.getInt();
    65                  if (i != otherI) {
    66                      return false;
    67                  }
    68              } else {
    69                  byte b = cursor.get();
    70                  byte otherB = otherCursor.get();
    71                  if (b != otherB) {
    72                      return false;
    73                  }
    74              }
    75          }
    76          return true;
    77      }
    78
    79  }