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1
7
8
10 package java.nio;
11
12
13 class ByteBufferAsCharBufferB extends CharBuffer 
15 {
16
17
18
19 protected final ByteBuffer bb;
20 protected final int offset;
21
22
23
24 ByteBufferAsCharBufferB(ByteBuffer bb) {
26 super(-1, 0,
27 bb.remaining() >> 1,
28 bb.remaining() >> 1);
29 this.bb = bb;
30 int cap = this.capacity();
32 this.limit(cap);
33 int pos = this.position();
34 assert (pos <= cap);
35 offset = pos;
36
37
38
39 }
40
41 ByteBufferAsCharBufferB(ByteBuffer bb,
42 int mark, int pos, int lim, int cap,
43 int off)
44 {
45
46 super(mark, pos, lim, cap);
47 this.bb = bb;
48 offset = off;
49
50
51
52 }
53
54 public CharBuffer slice() {
55 int pos = this.position();
56 int lim = this.limit();
57 assert (pos <= lim);
58 int rem = (pos <= lim ? lim - pos : 0);
59 int off = (pos << 1) + offset;
60 assert (off >= 0);
61 return new ByteBufferAsCharBufferB (bb, -1, 0, rem, rem, off);
62 }
63
64 public CharBuffer duplicate() {
65 return new ByteBufferAsCharBufferB (bb,
66 this.markValue(),
67 this.position(),
68 this.limit(),
69 this.capacity(),
70 offset);
71 }
72
73 public CharBuffer asReadOnlyBuffer() {
74
75 return new ByteBufferAsCharBufferRB (bb,
76 this.markValue(),
77 this.position(),
78 this.limit(),
79 this.capacity(),
80 offset);
81
82
83
84 }
85
86
87
88 protected int ix(int i) {
89 return (i << 1) + offset;
90 }
91
92 public char get() {
93 return Bits.getCharB(bb, ix(nextGetIndex()));
94 }
95
96 public char get(int i) {
97 return Bits.getCharB(bb, ix(checkIndex(i)));
98 }
99
100
101
102 public CharBuffer put(char x) {
103
104 Bits.putCharB(bb, ix(nextPutIndex()), x);
105 return this;
106
107
108
109 }
110
111 public CharBuffer put(int i, char x) {
112
113 Bits.putCharB(bb, ix(checkIndex(i)), x);
114 return this;
115
116
117
118 }
119
120 public CharBuffer compact() {
121
122 int pos = position();
123 int lim = limit();
124 assert (pos <= lim);
125 int rem = (pos <= lim ? lim - pos : 0);
126
127 ByteBuffer db = bb.duplicate();
128 db.limit(ix(lim));
129 db.position(ix(0));
130 ByteBuffer sb = db.slice();
131 sb.position(pos << 1);
132 sb.compact();
133 position(rem);
134 limit(capacity());
135 return this;
136
137
138
139 }
140
141 public boolean isDirect() {
142 return bb.isDirect();
143 }
144
145 public boolean isReadOnly() {
146 return false;
147 }
148
149
150
151 public String toString(int start, int end) {
152 if ((end > limit()) || (start > end))
153 throw new IndexOutOfBoundsException ();
154 try {
155 int len = end - start;
156 char[] ca = new char[len];
157 CharBuffer cb = CharBuffer.wrap(ca);
158 CharBuffer db = this.duplicate();
159 db.position(start);
160 db.limit(end);
161 cb.put(db);
162 return new String (ca);
163 } catch (StringIndexOutOfBoundsException x) {
164 throw new IndexOutOfBoundsException ();
165 }
166 }
167
168
169
171 public CharSequence subSequence(int start, int end) {
172 int pos = position();
173 int lim = limit();
174 assert (pos <= lim);
175 pos = (pos <= lim ? pos : lim);
176 int len = lim - pos;
177
178 if ((start < 0) || (end > len) || (start > end))
179 throw new IndexOutOfBoundsException ();
180 int sublen = end - start;
181 int off = offset + ((pos + start) << 1);
182 assert (off >= 0);
183 return new ByteBufferAsCharBufferB (bb, -1, 0, sublen, sublen, off);
184 }
185
186
187
188
189 public ByteOrder order() {
190
191 return ByteOrder.BIG_ENDIAN;
192
193
194
195
196 }
197
198 }
199 |
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