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 * 25 * Abstract class that implements {@link ByteArray}. This class will only be 26 * used internally and should not be used by end users. 27 * 28 * @author <a href="http://mina.apache.org">Apache MINA Project</a> 29 */ 30 abstract class AbstractByteArray implements ByteArray 31 { 32 33 /** 34 * @inheritDoc 35 */ 36 public final int length() 37 { 38 return last() - first(); 39 } 40 41 42 /** 43 * @inheritDoc 44 */ 45 @Override 46 public final boolean equals( Object other ) 47 { 48 // Optimization: compare pointers. 49 if ( other == this ) 50 { 51 return true; 52 } 53 // Compare types. 54 if ( !( other instanceof ByteArray ) ) 55 { 56 return false; 57 } 58 ByteArray otherByteArray = ( ByteArray ) other; 59 // Compare properties. 60 if ( first() != otherByteArray.first() || last() != otherByteArray.last() 61 || !order().equals( otherByteArray.order() ) ) 62 { 63 return false; 64 } 65 // Compare bytes. 66 Cursor cursor = cursor(); 67 Cursor otherCursor = otherByteArray.cursor(); 68 for ( int remaining = cursor.getRemaining(); remaining > 0; ) 69 { 70 // Optimization: prefer int comparisons over byte comparisons 71 if ( remaining >= 4 ) 72 { 73 int i = cursor.getInt(); 74 int otherI = otherCursor.getInt(); 75 if ( i != otherI ) 76 { 77 return false; 78 } 79 } 80 else 81 { 82 byte b = cursor.get(); 83 byte otherB = otherCursor.get(); 84 if ( b != otherB ) 85 { 86 return false; 87 } 88 } 89 } 90 return true; 91 } 92 93 }