1
25
26
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28 package java.nio;
29
30
40
41 class HeapCharBuffer
42 extends CharBuffer
43 {
44
45 private static final long ARRAY_BASE_OFFSET = UNSAFE.arrayBaseOffset(char[].class);
46
47
48 private static final long ARRAY_INDEX_SCALE = UNSAFE.arrayIndexScale(char[].class);
49
50
51
52
58
59 HeapCharBuffer(int cap, int lim) {
60
61 super(-1, 0, lim, cap, new char[cap], 0);
62
66 this.address = ARRAY_BASE_OFFSET;
67
68
69
70
71 }
72
73 HeapCharBuffer(char[] buf, int off, int len) {
74
75 super(-1, off, off + len, buf.length, buf, 0);
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80 this.address = ARRAY_BASE_OFFSET;
81
82
83
84
85 }
86
87 protected HeapCharBuffer(char[] buf,
88 int mark, int pos, int lim, int cap,
89 int off)
90 {
91
92 super(mark, pos, lim, cap, buf, off);
93
97 this.address = ARRAY_BASE_OFFSET + off * ARRAY_INDEX_SCALE;
98
99
100
101
102 }
103
104 public CharBuffer slice() {
105 return new HeapCharBuffer(hb,
106 -1,
107 0,
108 this.remaining(),
109 this.remaining(),
110 this.position() + offset);
111 }
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127 public CharBuffer duplicate() {
128 return new HeapCharBuffer(hb,
129 this.markValue(),
130 this.position(),
131 this.limit(),
132 this.capacity(),
133 offset);
134 }
135
136 public CharBuffer asReadOnlyBuffer() {
137
138 return new HeapCharBufferR(hb,
139 this.markValue(),
140 this.position(),
141 this.limit(),
142 this.capacity(),
143 offset);
144
145
146
147 }
148
149
150
151 protected int ix(int i) {
152 return i + offset;
153 }
154
155
156
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159
160
161 public char get() {
162 return hb[ix(nextGetIndex())];
163 }
164
165 public char get(int i) {
166 return hb[ix(checkIndex(i))];
167 }
168
169
170 char getUnchecked(int i) {
171 return hb[ix(i)];
172 }
173
174
175 public CharBuffer get(char[] dst, int offset, int length) {
176 checkBounds(offset, length, dst.length);
177 if (length > remaining())
178 throw new BufferUnderflowException();
179 System.arraycopy(hb, ix(position()), dst, offset, length);
180 position(position() + length);
181 return this;
182 }
183
184 public boolean isDirect() {
185 return false;
186 }
187
188
189
190 public boolean isReadOnly() {
191 return false;
192 }
193
194 public CharBuffer put(char x) {
195
196 hb[ix(nextPutIndex())] = x;
197 return this;
198
199
200
201 }
202
203 public CharBuffer put(int i, char x) {
204
205 hb[ix(checkIndex(i))] = x;
206 return this;
207
208
209
210 }
211
212 public CharBuffer put(char[] src, int offset, int length) {
213
214 checkBounds(offset, length, src.length);
215 if (length > remaining())
216 throw new BufferOverflowException();
217 System.arraycopy(src, offset, hb, ix(position()), length);
218 position(position() + length);
219 return this;
220
221
222
223 }
224
225 public CharBuffer put(CharBuffer src) {
226
227 if (src instanceof HeapCharBuffer) {
228 if (src == this)
229 throw createSameBufferException();
230 HeapCharBuffer sb = (HeapCharBuffer)src;
231 int n = sb.remaining();
232 if (n > remaining())
233 throw new BufferOverflowException();
234 System.arraycopy(sb.hb, sb.ix(sb.position()),
235 hb, ix(position()), n);
236 sb.position(sb.position() + n);
237 position(position() + n);
238 } else if (src.isDirect()) {
239 int n = src.remaining();
240 if (n > remaining())
241 throw new BufferOverflowException();
242 src.get(hb, ix(position()), n);
243 position(position() + n);
244 } else {
245 super.put(src);
246 }
247 return this;
248
249
250
251 }
252
253 public CharBuffer compact() {
254
255 System.arraycopy(hb, ix(position()), hb, ix(0), remaining());
256 position(remaining());
257 limit(capacity());
258 discardMark();
259 return this;
260
261
262
263 }
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600 String toString(int start, int end) {
601 try {
602 return new String(hb, start + offset, end - start);
603 } catch (StringIndexOutOfBoundsException x) {
604 throw new IndexOutOfBoundsException();
605 }
606 }
607
608
609
610
611 public CharBuffer subSequence(int start, int end) {
612 if ((start < 0)
613 || (end > length())
614 || (start > end))
615 throw new IndexOutOfBoundsException();
616 int pos = position();
617 return new HeapCharBuffer(hb,
618 -1,
619 pos + start,
620 pos + end,
621 capacity(),
622 offset);
623 }
624
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628
629
630 public ByteOrder order() {
631 return ByteOrder.nativeOrder();
632 }
633
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635
636 ByteOrder charRegionOrder() {
637 return order();
638 }
639
640 }
641