2
* Copyright 2000-2006 Sun Microsystems, Inc. All Rights Reserved.
3
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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. Sun designates this
8
* particular file as subject to the "Classpath" exception as provided
9
* by Sun in the LICENSE file that accompanied this code.
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).
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.
21
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22
* CA 95054 USA or visit www.sun.com if you need additional information or
26
// -- This file was mechanically generated: Do not edit! -- //
28
package java.nio.charset;
30
import java.nio.Buffer;
31
import java.nio.ByteBuffer;
32
import java.nio.CharBuffer;
33
import java.nio.BufferOverflowException;
34
import java.nio.BufferUnderflowException;
35
import java.lang.ref.WeakReference;
36
import java.nio.charset.CoderMalfunctionError; // javadoc
40
* An engine that can transform a sequence of bytes in a specific charset into a sequence of
41
* sixteen-bit Unicode characters.
45
* <p> The input byte sequence is provided in a byte buffer or a series
46
* of such buffers. The output character sequence is written to a character buffer
47
* or a series of such buffers. A decoder should always be used by making
48
* the following sequence of method invocations, hereinafter referred to as a
49
* <i>decoding operation</i>:
53
* <li><p> Reset the decoder via the {@link #reset reset} method, unless it
54
* has not been used before; </p></li>
56
* <li><p> Invoke the {@link #decode decode} method zero or more times, as
57
* long as additional input may be available, passing <tt>false</tt> for the
58
* <tt>endOfInput</tt> argument and filling the input buffer and flushing the
59
* output buffer between invocations; </p></li>
61
* <li><p> Invoke the {@link #decode decode} method one final time, passing
62
* <tt>true</tt> for the <tt>endOfInput</tt> argument; and then </p></li>
64
* <li><p> Invoke the {@link #flush flush} method so that the decoder can
65
* flush any internal state to the output buffer. </p></li>
69
* Each invocation of the {@link #decode decode} method will decode as many
70
* bytes as possible from the input buffer, writing the resulting characters
71
* to the output buffer. The {@link #decode decode} method returns when more
72
* input is required, when there is not enough room in the output buffer, or
73
* when a decoding error has occurred. In each case a {@link CoderResult}
74
* object is returned to describe the reason for termination. An invoker can
75
* examine this object and fill the input buffer, flush the output buffer, or
76
* attempt to recover from a decoding error, as appropriate, and try again.
80
* <p> There are two general types of decoding errors. If the input byte
81
* sequence is not legal for this charset then the input is considered <i>malformed</i>. If
82
* the input byte sequence is legal but cannot be mapped to a valid
83
* Unicode character then an <i>unmappable character</i> has been encountered.
87
* <p> How a decoding error is handled depends upon the action requested for
88
* that type of error, which is described by an instance of the {@link
89
* CodingErrorAction} class. The possible error actions are to {@link
90
* CodingErrorAction#IGNORE </code>ignore<code>} the erroneous input, {@link
91
* CodingErrorAction#REPORT </code>report<code>} the error to the invoker via
92
* the returned {@link CoderResult} object, or {@link CodingErrorAction#REPLACE
93
* </code>replace<code>} the erroneous input with the current value of the
94
* replacement string. The replacement
101
* has the initial value <tt>"\uFFFD"</tt>;
104
* its value may be changed via the {@link #replaceWith(java.lang.String)
105
* replaceWith} method.
107
* <p> The default action for malformed-input and unmappable-character errors
108
* is to {@link CodingErrorAction#REPORT </code>report<code>} them. The
109
* malformed-input error action may be changed via the {@link
110
* #onMalformedInput(CodingErrorAction) onMalformedInput} method; the
111
* unmappable-character action may be changed via the {@link
112
* #onUnmappableCharacter(CodingErrorAction) onUnmappableCharacter} method.
114
* <p> This class is designed to handle many of the details of the decoding
115
* process, including the implementation of error actions. A decoder for a
116
* specific charset, which is a concrete subclass of this class, need only
117
* implement the abstract {@link #decodeLoop decodeLoop} method, which
118
* encapsulates the basic decoding loop. A subclass that maintains internal
119
* state should, additionally, override the {@link #implFlush implFlush} and
120
* {@link #implReset implReset} methods.
122
* <p> Instances of this class are not safe for use by multiple concurrent
126
* @author Mark Reinhold
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* @author JSR-51 Expert Group
133
* @see CharsetEncoder
136
public abstract class CharsetDecoder {
138
private final Charset charset;
139
private final float averageCharsPerByte;
140
private final float maxCharsPerByte;
142
private String replacement;
143
private CodingErrorAction malformedInputAction
144
= CodingErrorAction.REPORT;
145
private CodingErrorAction unmappableCharacterAction
146
= CodingErrorAction.REPORT;
150
private static final int ST_RESET = 0;
151
private static final int ST_CODING = 1;
152
private static final int ST_END = 2;
153
private static final int ST_FLUSHED = 3;
155
private int state = ST_RESET;
157
private static String stateNames[]
158
= { "RESET", "CODING", "CODING_END", "FLUSHED" };
162
* Initializes a new decoder. The new decoder will have the given
163
* chars-per-byte and replacement values. </p>
165
* @param averageCharsPerByte
166
* A positive float value indicating the expected number of
167
* characters that will be produced for each input byte
169
* @param maxCharsPerByte
170
* A positive float value indicating the maximum number of
171
* characters that will be produced for each input byte
174
* The initial replacement; must not be <tt>null</tt>, must have
175
* non-zero length, must not be longer than maxCharsPerByte,
176
* and must be {@link #isLegalReplacement </code>legal<code>}
178
* @throws IllegalArgumentException
179
* If the preconditions on the parameters do not hold
182
CharsetDecoder(Charset cs,
183
float averageCharsPerByte,
184
float maxCharsPerByte,
188
if (averageCharsPerByte <= 0.0f)
189
throw new IllegalArgumentException("Non-positive "
190
+ "averageCharsPerByte");
191
if (maxCharsPerByte <= 0.0f)
192
throw new IllegalArgumentException("Non-positive "
193
+ "maxCharsPerByte");
194
if (!Charset.atBugLevel("1.4")) {
195
if (averageCharsPerByte > maxCharsPerByte)
196
throw new IllegalArgumentException("averageCharsPerByte"
198
+ "maxCharsPerByte");
200
this.replacement = replacement;
201
this.averageCharsPerByte = averageCharsPerByte;
202
this.maxCharsPerByte = maxCharsPerByte;
203
replaceWith(replacement);
207
* Initializes a new decoder. The new decoder will have the given
208
* chars-per-byte values and its replacement will be the
209
* string <tt>"\uFFFD"</tt>. </p>
211
* @param averageCharsPerByte
212
* A positive float value indicating the expected number of
213
* characters that will be produced for each input byte
215
* @param maxCharsPerByte
216
* A positive float value indicating the maximum number of
217
* characters that will be produced for each input byte
219
* @throws IllegalArgumentException
220
* If the preconditions on the parameters do not hold
222
protected CharsetDecoder(Charset cs,
223
float averageCharsPerByte,
224
float maxCharsPerByte)
227
averageCharsPerByte, maxCharsPerByte,
232
* Returns the charset that created this decoder. </p>
234
* @return This decoder's charset
236
public final Charset charset() {
241
* Returns this decoder's replacement value. </p>
243
* @return This decoder's current replacement,
244
* which is never <tt>null</tt> and is never empty
246
public final String replacement() {
251
* Changes this decoder's replacement value.
253
* <p> This method invokes the {@link #implReplaceWith implReplaceWith}
254
* method, passing the new replacement, after checking that the new
255
* replacement is acceptable. </p>
257
* @param newReplacement
260
* The new replacement; must not be <tt>null</tt>
261
* and must have non-zero length
270
* @return This decoder
272
* @throws IllegalArgumentException
273
* If the preconditions on the parameter do not hold
275
public final CharsetDecoder replaceWith(String newReplacement) {
276
if (newReplacement == null)
277
throw new IllegalArgumentException("Null replacement");
278
int len = newReplacement.length();
280
throw new IllegalArgumentException("Empty replacement");
281
if (len > maxCharsPerByte)
282
throw new IllegalArgumentException("Replacement too long");
287
this.replacement = newReplacement;
288
implReplaceWith(newReplacement);
293
* Reports a change to this decoder's replacement value.
295
* <p> The default implementation of this method does nothing. This method
296
* should be overridden by decoders that require notification of changes to
297
* the replacement. </p>
299
* @param newReplacement
301
protected void implReplaceWith(String newReplacement) {
345
* Returns this decoder's current action for malformed-input errors. </p>
347
* @return The current malformed-input action, which is never <tt>null</tt>
349
public CodingErrorAction malformedInputAction() {
350
return malformedInputAction;
354
* Changes this decoder's action for malformed-input errors. </p>
356
* <p> This method invokes the {@link #implOnMalformedInput
357
* implOnMalformedInput} method, passing the new action. </p>
359
* @param newAction The new action; must not be <tt>null</tt>
361
* @return This decoder
363
* @throws IllegalArgumentException
364
* If the precondition on the parameter does not hold
366
public final CharsetDecoder onMalformedInput(CodingErrorAction newAction) {
367
if (newAction == null)
368
throw new IllegalArgumentException("Null action");
369
malformedInputAction = newAction;
370
implOnMalformedInput(newAction);
375
* Reports a change to this decoder's malformed-input action.
377
* <p> The default implementation of this method does nothing. This method
378
* should be overridden by decoders that require notification of changes to
379
* the malformed-input action. </p>
381
protected void implOnMalformedInput(CodingErrorAction newAction) { }
384
* Returns this decoder's current action for unmappable-character errors.
387
* @return The current unmappable-character action, which is never
390
public CodingErrorAction unmappableCharacterAction() {
391
return unmappableCharacterAction;
395
* Changes this decoder's action for unmappable-character errors.
397
* <p> This method invokes the {@link #implOnUnmappableCharacter
398
* implOnUnmappableCharacter} method, passing the new action. </p>
400
* @param newAction The new action; must not be <tt>null</tt>
402
* @return This decoder
404
* @throws IllegalArgumentException
405
* If the precondition on the parameter does not hold
407
public final CharsetDecoder onUnmappableCharacter(CodingErrorAction
410
if (newAction == null)
411
throw new IllegalArgumentException("Null action");
412
unmappableCharacterAction = newAction;
413
implOnUnmappableCharacter(newAction);
418
* Reports a change to this decoder's unmappable-character action.
420
* <p> The default implementation of this method does nothing. This method
421
* should be overridden by decoders that require notification of changes to
422
* the unmappable-character action. </p>
424
protected void implOnUnmappableCharacter(CodingErrorAction newAction) { }
427
* Returns the average number of characters that will be produced for each
428
* byte of input. This heuristic value may be used to estimate the size
429
* of the output buffer required for a given input sequence. </p>
431
* @return The average number of characters produced
434
public final float averageCharsPerByte() {
435
return averageCharsPerByte;
439
* Returns the maximum number of characters that will be produced for each
440
* byte of input. This value may be used to compute the worst-case size
441
* of the output buffer required for a given input sequence. </p>
443
* @return The maximum number of characters that will be produced per
446
public final float maxCharsPerByte() {
447
return maxCharsPerByte;
451
* Decodes as many bytes as possible from the given input buffer,
452
* writing the results to the given output buffer.
454
* <p> The buffers are read from, and written to, starting at their current
455
* positions. At most {@link Buffer#remaining in.remaining()} bytes
456
* will be read and at most {@link Buffer#remaining out.remaining()}
457
* characters will be written. The buffers' positions will be advanced to
458
* reflect the bytes read and the characters written, but their marks and
459
* limits will not be modified.
461
* <p> In addition to reading bytes from the input buffer and writing
462
* characters to the output buffer, this method returns a {@link CoderResult}
463
* object to describe its reason for termination:
467
* <li><p> {@link CoderResult#UNDERFLOW} indicates that as much of the
468
* input buffer as possible has been decoded. If there is no further
469
* input then the invoker can proceed to the next step of the
470
* <a href="#steps">decoding operation</a>. Otherwise this method
471
* should be invoked again with further input. </p></li>
473
* <li><p> {@link CoderResult#OVERFLOW} indicates that there is
474
* insufficient space in the output buffer to decode any more bytes.
475
* This method should be invoked again with an output buffer that has
476
* more {@linkplain Buffer#remaining remaining} characters. This is
477
* typically done by draining any decoded characters from the output
480
* <li><p> A {@link CoderResult#malformedForLength
481
* </code>malformed-input<code>} result indicates that a malformed-input
482
* error has been detected. The malformed bytes begin at the input
483
* buffer's (possibly incremented) position; the number of malformed
484
* bytes may be determined by invoking the result object's {@link
485
* CoderResult#length() length} method. This case applies only if the
486
* {@link #onMalformedInput </code>malformed action<code>} of this decoder
487
* is {@link CodingErrorAction#REPORT}; otherwise the malformed input
488
* will be ignored or replaced, as requested. </p></li>
490
* <li><p> An {@link CoderResult#unmappableForLength
491
* </code>unmappable-character<code>} result indicates that an
492
* unmappable-character error has been detected. The bytes that
493
* decode the unmappable character begin at the input buffer's (possibly
494
* incremented) position; the number of such bytes may be determined
495
* by invoking the result object's {@link CoderResult#length() length}
496
* method. This case applies only if the {@link #onUnmappableCharacter
497
* </code>unmappable action<code>} of this decoder is {@link
498
* CodingErrorAction#REPORT}; otherwise the unmappable character will be
499
* ignored or replaced, as requested. </p></li>
503
* In any case, if this method is to be reinvoked in the same decoding
504
* operation then care should be taken to preserve any bytes remaining
505
* in the input buffer so that they are available to the next invocation.
507
* <p> The <tt>endOfInput</tt> parameter advises this method as to whether
508
* the invoker can provide further input beyond that contained in the given
509
* input buffer. If there is a possibility of providing additional input
510
* then the invoker should pass <tt>false</tt> for this parameter; if there
511
* is no possibility of providing further input then the invoker should
512
* pass <tt>true</tt>. It is not erroneous, and in fact it is quite
513
* common, to pass <tt>false</tt> in one invocation and later discover that
514
* no further input was actually available. It is critical, however, that
515
* the final invocation of this method in a sequence of invocations always
516
* pass <tt>true</tt> so that any remaining undecoded input will be treated
517
* as being malformed.
519
* <p> This method works by invoking the {@link #decodeLoop decodeLoop}
520
* method, interpreting its results, handling error conditions, and
521
* reinvoking it as necessary. </p>
525
* The input byte buffer
528
* The output character buffer
531
* <tt>true</tt> if, and only if, the invoker can provide no
532
* additional input bytes beyond those in the given buffer
534
* @return A coder-result object describing the reason for termination
536
* @throws IllegalStateException
537
* If a decoding operation is already in progress and the previous
538
* step was an invocation neither of the {@link #reset reset}
539
* method, nor of this method with a value of <tt>false</tt> for
540
* the <tt>endOfInput</tt> parameter, nor of this method with a
541
* value of <tt>true</tt> for the <tt>endOfInput</tt> parameter
542
* but a return value indicating an incomplete decoding operation
544
* @throws CoderMalfunctionError
545
* If an invocation of the decodeLoop method threw
546
* an unexpected exception
548
public final CoderResult decode(ByteBuffer in, CharBuffer out,
551
int newState = endOfInput ? ST_END : ST_CODING;
552
if ((state != ST_RESET) && (state != ST_CODING)
553
&& !(endOfInput && (state == ST_END)))
554
throwIllegalStateException(state, newState);
561
cr = decodeLoop(in, out);
562
} catch (BufferUnderflowException x) {
563
throw new CoderMalfunctionError(x);
564
} catch (BufferOverflowException x) {
565
throw new CoderMalfunctionError(x);
571
if (cr.isUnderflow()) {
572
if (endOfInput && in.hasRemaining()) {
573
cr = CoderResult.malformedForLength(in.remaining());
574
// Fall through to malformed-input case
580
CodingErrorAction action = null;
581
if (cr.isMalformed())
582
action = malformedInputAction;
583
else if (cr.isUnmappable())
584
action = unmappableCharacterAction;
586
assert false : cr.toString();
588
if (action == CodingErrorAction.REPORT)
591
if (action == CodingErrorAction.REPLACE) {
592
if (out.remaining() < replacement.length())
593
return CoderResult.OVERFLOW;
594
out.put(replacement);
597
if ((action == CodingErrorAction.IGNORE)
598
|| (action == CodingErrorAction.REPLACE)) {
599
// Skip erroneous input either way
600
in.position(in.position() + cr.length());
610
* Flushes this decoder.
612
* <p> Some decoders maintain internal state and may need to write some
613
* final characters to the output buffer once the overall input sequence has
616
* <p> Any additional output is written to the output buffer beginning at
617
* its current position. At most {@link Buffer#remaining out.remaining()}
618
* characters will be written. The buffer's position will be advanced
619
* appropriately, but its mark and limit will not be modified.
621
* <p> If this method completes successfully then it returns {@link
622
* CoderResult#UNDERFLOW}. If there is insufficient room in the output
623
* buffer then it returns {@link CoderResult#OVERFLOW}. If this happens
624
* then this method must be invoked again, with an output buffer that has
625
* more room, in order to complete the current <a href="#steps">decoding
628
* <p> If this decoder has already been flushed then invoking this method
631
* <p> This method invokes the {@link #implFlush implFlush} method to
632
* perform the actual flushing operation. </p>
635
* The output character buffer
637
* @return A coder-result object, either {@link CoderResult#UNDERFLOW} or
638
* {@link CoderResult#OVERFLOW}
640
* @throws IllegalStateException
641
* If the previous step of the current decoding operation was an
642
* invocation neither of the {@link #flush flush} method nor of
643
* the three-argument {@link
644
* #decode(ByteBuffer,CharBuffer,boolean) decode} method
645
* with a value of <tt>true</tt> for the <tt>endOfInput</tt>
648
public final CoderResult flush(CharBuffer out) {
649
if (state == ST_END) {
650
CoderResult cr = implFlush(out);
651
if (cr.isUnderflow())
656
if (state != ST_FLUSHED)
657
throwIllegalStateException(state, ST_FLUSHED);
659
return CoderResult.UNDERFLOW; // Already flushed
663
* Flushes this decoder.
665
* <p> The default implementation of this method does nothing, and always
666
* returns {@link CoderResult#UNDERFLOW}. This method should be overridden
667
* by decoders that may need to write final characters to the output buffer
668
* once the entire input sequence has been read. </p>
671
* The output character buffer
673
* @return A coder-result object, either {@link CoderResult#UNDERFLOW} or
674
* {@link CoderResult#OVERFLOW}
676
protected CoderResult implFlush(CharBuffer out) {
677
return CoderResult.UNDERFLOW;
681
* Resets this decoder, clearing any internal state.
683
* <p> This method resets charset-independent state and also invokes the
684
* {@link #implReset() implReset} method in order to perform any
685
* charset-specific reset actions. </p>
687
* @return This decoder
690
public final CharsetDecoder reset() {
697
* Resets this decoder, clearing any charset-specific internal state.
699
* <p> The default implementation of this method does nothing. This method
700
* should be overridden by decoders that maintain internal state. </p>
702
protected void implReset() { }
705
* Decodes one or more bytes into one or more characters.
707
* <p> This method encapsulates the basic decoding loop, decoding as many
708
* bytes as possible until it either runs out of input, runs out of room
709
* in the output buffer, or encounters a decoding error. This method is
710
* invoked by the {@link #decode decode} method, which handles result
711
* interpretation and error recovery.
713
* <p> The buffers are read from, and written to, starting at their current
714
* positions. At most {@link Buffer#remaining in.remaining()} bytes
715
* will be read, and at most {@link Buffer#remaining out.remaining()}
716
* characters will be written. The buffers' positions will be advanced to
717
* reflect the bytes read and the characters written, but their marks and
718
* limits will not be modified.
720
* <p> This method returns a {@link CoderResult} object to describe its
721
* reason for termination, in the same manner as the {@link #decode decode}
722
* method. Most implementations of this method will handle decoding errors
723
* by returning an appropriate result object for interpretation by the
724
* {@link #decode decode} method. An optimized implementation may instead
725
* examine the relevant error action and implement that action itself.
727
* <p> An implementation of this method may perform arbitrary lookahead by
728
* returning {@link CoderResult#UNDERFLOW} until it receives sufficient
732
* The input byte buffer
735
* The output character buffer
737
* @return A coder-result object describing the reason for termination
739
protected abstract CoderResult decodeLoop(ByteBuffer in,
743
* Convenience method that decodes the remaining content of a single input
744
* byte buffer into a newly-allocated character buffer.
746
* <p> This method implements an entire <a href="#steps">decoding
747
* operation</a>; that is, it resets this decoder, then it decodes the
748
* bytes in the given byte buffer, and finally it flushes this
749
* decoder. This method should therefore not be invoked if a decoding
750
* operation is already in progress. </p>
753
* The input byte buffer
755
* @return A newly-allocated character buffer containing the result of the
756
* decoding operation. The buffer's position will be zero and its
757
* limit will follow the last character written.
759
* @throws IllegalStateException
760
* If a decoding operation is already in progress
762
* @throws MalformedInputException
763
* If the byte sequence starting at the input buffer's current
764
* position is not legal for this charset and the current malformed-input action
765
* is {@link CodingErrorAction#REPORT}
767
* @throws UnmappableCharacterException
768
* If the byte sequence starting at the input buffer's current
769
* position cannot be mapped to an equivalent character sequence and
770
* the current unmappable-character action is {@link
771
* CodingErrorAction#REPORT}
773
public final CharBuffer decode(ByteBuffer in)
774
throws CharacterCodingException
776
int n = (int)(in.remaining() * averageCharsPerByte());
777
CharBuffer out = CharBuffer.allocate(n);
779
if ((n == 0) && (in.remaining() == 0))
783
CoderResult cr = in.hasRemaining() ?
784
decode(in, out, true) : CoderResult.UNDERFLOW;
785
if (cr.isUnderflow())
788
if (cr.isUnderflow())
790
if (cr.isOverflow()) {
791
n = 2*n + 1; // Ensure progress; n might be 0!
792
CharBuffer o = CharBuffer.allocate(n);
807
* Tells whether or not this decoder implements an auto-detecting charset.
809
* <p> The default implementation of this method always returns
810
* <tt>false</tt>; it should be overridden by auto-detecting decoders to
811
* return <tt>true</tt>. </p>
813
* @return <tt>true</tt> if, and only if, this decoder implements an
814
* auto-detecting charset
816
public boolean isAutoDetecting() {
821
* Tells whether or not this decoder has yet detected a
822
* charset <i>(optional operation)</i>.
824
* <p> If this decoder implements an auto-detecting charset then at a
825
* single point during a decoding operation this method may start returning
826
* <tt>true</tt> to indicate that a specific charset has been detected in
827
* the input byte sequence. Once this occurs, the {@link #detectedCharset
828
* detectedCharset} method may be invoked to retrieve the detected charset.
830
* <p> That this method returns <tt>false</tt> does not imply that no bytes
831
* have yet been decoded. Some auto-detecting decoders are capable of
832
* decoding some, or even all, of an input byte sequence without fixing on
833
* a particular charset.
835
* <p> The default implementation of this method always throws an {@link
836
* UnsupportedOperationException}; it should be overridden by
837
* auto-detecting decoders to return <tt>true</tt> once the input charset
838
* has been determined. </p>
840
* @return <tt>true</tt> if, and only if, this decoder has detected a
843
* @throws UnsupportedOperationException
844
* If this decoder does not implement an auto-detecting charset
846
public boolean isCharsetDetected() {
847
throw new UnsupportedOperationException();
851
* Retrieves the charset that was detected by this
852
* decoder <i>(optional operation)</i>.
854
* <p> If this decoder implements an auto-detecting charset then this
855
* method returns the actual charset once it has been detected. After that
856
* point, this method returns the same value for the duration of the
857
* current decoding operation. If not enough input bytes have yet been
858
* read to determine the actual charset then this method throws an {@link
859
* IllegalStateException}.
861
* <p> The default implementation of this method always throws an {@link
862
* UnsupportedOperationException}; it should be overridden by
863
* auto-detecting decoders to return the appropriate value. </p>
865
* @return The charset detected by this auto-detecting decoder,
866
* or <tt>null</tt> if the charset has not yet been determined
868
* @throws IllegalStateException
869
* If insufficient bytes have been read to determine a charset
871
* @throws UnsupportedOperationException
872
* If this decoder does not implement an auto-detecting charset
874
public Charset detectedCharset() {
875
throw new UnsupportedOperationException();
967
private void throwIllegalStateException(int from, int to) {
968
throw new IllegalStateException("Current state = " + stateNames[from]
969
+ ", new state = " + stateNames[to]);
added
removed
generated/java/nio/charset/CharsetDecoder.java
