1 /* 2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package java.nio; 27 28 29 // ## If the sequence is a string, use reflection to share its array 30 31 class StringCharBuffer // package-private 32 extends CharBuffer { 33 CharSequence str; 34 StringCharBuffer(CharSequence s, int start, int end)35 StringCharBuffer(CharSequence s, int start, int end) { // package-private 36 super(-1, start, end, s.length()); 37 int n = s.length(); 38 if ((start < 0) || (start > n) || (end < start) || (end > n)) 39 throw new IndexOutOfBoundsException(); 40 str = s; 41 } 42 slice()43 public CharBuffer slice() { 44 return new StringCharBuffer(str, 45 -1, 46 0, 47 this.remaining(), 48 this.remaining(), 49 offset + this.position()); 50 } 51 StringCharBuffer(CharSequence s, int mark, int pos, int limit, int cap, int offset)52 private StringCharBuffer(CharSequence s, 53 int mark, 54 int pos, 55 int limit, 56 int cap, 57 int offset) { 58 super(mark, pos, limit, cap, null, offset); 59 str = s; 60 } 61 duplicate()62 public CharBuffer duplicate() { 63 return new StringCharBuffer(str, markValue(), 64 position(), limit(), capacity(), offset); 65 } 66 asReadOnlyBuffer()67 public CharBuffer asReadOnlyBuffer() { 68 return duplicate(); 69 } 70 get()71 public final char get() { 72 return str.charAt(nextGetIndex() + offset); 73 } 74 get(int index)75 public final char get(int index) { 76 return str.charAt(checkIndex(index) + offset); 77 } 78 getUnchecked(int index)79 char getUnchecked(int index) { 80 return str.charAt(index + offset); 81 } 82 83 // ## Override bulk get methods for better performance 84 put(char c)85 public final CharBuffer put(char c) { 86 throw new ReadOnlyBufferException(); 87 } 88 put(int index, char c)89 public final CharBuffer put(int index, char c) { 90 throw new ReadOnlyBufferException(); 91 } 92 compact()93 public final CharBuffer compact() { 94 throw new ReadOnlyBufferException(); 95 } 96 isReadOnly()97 public final boolean isReadOnly() { 98 return true; 99 } 100 toString(int start, int end)101 final String toString(int start, int end) { 102 return str.toString().substring(start + offset, end + offset); 103 } 104 subSequence(int start, int end)105 public final CharBuffer subSequence(int start, int end) { 106 try { 107 int pos = position(); 108 return new StringCharBuffer(str, 109 -1, 110 pos + checkIndex(start, pos), 111 pos + checkIndex(end, pos), 112 capacity(), 113 offset); 114 } catch (IllegalArgumentException x) { 115 throw new IndexOutOfBoundsException(); 116 } 117 } 118 isDirect()119 public boolean isDirect() { 120 return false; 121 } 122 order()123 public ByteOrder order() { 124 return ByteOrder.nativeOrder(); 125 } 126 127 } 128