001 /*
002 * Copyright 2000-2005 Sun Microsystems, Inc. All Rights Reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation. Sun designates this
008 * particular file as subject to the "Classpath" exception as provided
009 * by Sun in the LICENSE file that accompanied this code.
010 *
011 * This code is distributed in the hope that it will be useful, but WITHOUT
012 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
014 * version 2 for more details (a copy is included in the LICENSE file that
015 * accompanied this code).
016 *
017 * You should have received a copy of the GNU General Public License version
018 * 2 along with this work; if not, write to the Free Software Foundation,
019 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020 *
021 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022 * CA 95054 USA or visit www.sun.com if you need additional information or
023 * have any questions.
024 */
025
026 package java.nio;
027
028 // ## If the sequence is a string, use reflection to share its array
029
030 class StringCharBuffer // package-private
031 extends CharBuffer {
032 CharSequence str;
033
034 StringCharBuffer(CharSequence s, int start, int end) { // package-private
035 super (-1, start, end, s.length());
036 int n = s.length();
037 if ((start < 0) || (start > n) || (end < start) || (end > n))
038 throw new IndexOutOfBoundsException();
039 str = s;
040 }
041
042 public CharBuffer slice() {
043 return new StringCharBuffer(str, -1, 0, this .remaining(), this
044 .remaining(), this .position());
045 }
046
047 private StringCharBuffer(CharSequence s, int mark, int pos,
048 int limit, int cap, int offset) {
049 super (mark, pos, limit, cap, null, offset);
050 str = s;
051 }
052
053 private StringCharBuffer(CharSequence s, int mark, int pos,
054 int limit, int cap) {
055 super (mark, pos, limit, cap);
056 str = s;
057 }
058
059 public CharBuffer duplicate() {
060 return new StringCharBuffer(str, markValue(), position(),
061 limit(), capacity());
062 }
063
064 public CharBuffer asReadOnlyBuffer() {
065 return duplicate();
066 }
067
068 public final char get() {
069 return str.charAt(nextGetIndex());
070 }
071
072 public final char get(int index) {
073 return str.charAt(checkIndex(index));
074 }
075
076 // ## Override bulk get methods for better performance
077
078 public final CharBuffer put(char c) {
079 throw new ReadOnlyBufferException();
080 }
081
082 public final CharBuffer put(int index, char c) {
083 throw new ReadOnlyBufferException();
084 }
085
086 public final CharBuffer compact() {
087 throw new ReadOnlyBufferException();
088 }
089
090 public final boolean isReadOnly() {
091 return true;
092 }
093
094 final String toString(int start, int end) {
095 return str.toString().substring(start, end);
096 }
097
098 public final CharSequence subSequence(int start, int end) {
099 try {
100 int pos = position();
101 return new StringCharBuffer(str, pos
102 + checkIndex(start, pos), pos
103 + checkIndex(end, pos));
104 } catch (IllegalArgumentException x) {
105 throw new IndexOutOfBoundsException();
106 }
107 }
108
109 public boolean isDirect() {
110 return false;
111 }
112
113 public ByteOrder order() {
114 return ByteOrder.nativeOrder();
115 }
116
117 }
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