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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/nio/charset/CharsetDecoder.java | |
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Diffstat (limited to 'libjava/classpath/java/nio/charset/CharsetDecoder.java')
-rw-r--r-- | libjava/classpath/java/nio/charset/CharsetDecoder.java | 317 |
1 files changed, 317 insertions, 0 deletions
diff --git a/libjava/classpath/java/nio/charset/CharsetDecoder.java b/libjava/classpath/java/nio/charset/CharsetDecoder.java new file mode 100644 index 000000000..cf43feafd --- /dev/null +++ b/libjava/classpath/java/nio/charset/CharsetDecoder.java @@ -0,0 +1,317 @@ +/* CharsetDecoder.java -- + Copyright (C) 2002 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package java.nio.charset; + +import java.nio.ByteBuffer; +import java.nio.CharBuffer; + +/** + * @author Jesse Rosenstock + * @since 1.4 + */ +public abstract class CharsetDecoder +{ + private static final int STATE_RESET = 0; + private static final int STATE_CODING = 1; + private static final int STATE_END = 2; + private static final int STATE_FLUSHED = 3; + + private static final String DEFAULT_REPLACEMENT = "\uFFFD"; + + private final Charset charset; + private final float averageCharsPerByte; + private final float maxCharsPerByte; + private String replacement; + + private int state = STATE_RESET; + + private CodingErrorAction malformedInputAction + = CodingErrorAction.REPORT; + private CodingErrorAction unmappableCharacterAction + = CodingErrorAction.REPORT; + + private CharsetDecoder (Charset cs, float averageCharsPerByte, + float maxCharsPerByte, String replacement) + { + if (averageCharsPerByte <= 0.0f) + throw new IllegalArgumentException ("Non-positive averageCharsPerByte"); + if (maxCharsPerByte <= 0.0f) + throw new IllegalArgumentException ("Non-positive maxCharsPerByte"); + + this.charset = cs; + this.averageCharsPerByte + = averageCharsPerByte; + this.maxCharsPerByte + = maxCharsPerByte; + this.replacement = replacement; + implReplaceWith (replacement); + } + + protected CharsetDecoder (Charset cs, float averageCharsPerByte, + float maxCharsPerByte) + { + this (cs, averageCharsPerByte, maxCharsPerByte, DEFAULT_REPLACEMENT); + } + + public final float averageCharsPerByte () + { + return averageCharsPerByte; + } + + public final Charset charset () + { + return charset; + } + + public final CharBuffer decode (ByteBuffer in) + throws CharacterCodingException + { + // XXX: Sun's Javadoc seems to contradict itself saying an + // IllegalStateException is thrown "if a decoding operation is already + // in progress" and also that "it resets this Decoder". + // Should we check to see that the state is reset, or should we + // call reset()? + if (state != STATE_RESET) + throw new IllegalStateException (); + + // REVIEW: Using max instead of average may allocate a very large + // buffer. Maybe we should do something more efficient? + int remaining = in.remaining (); + int n = (int) (remaining * maxCharsPerByte ()); + CharBuffer out = CharBuffer.allocate (n); + + if (remaining == 0) + { + state = STATE_FLUSHED; + return out; + } + + CoderResult cr = decode (in, out, true); + if (cr.isError ()) + cr.throwException (); + + cr = flush (out); + if (cr.isError ()) + cr.throwException (); + + reset(); + out.flip (); + + // Unfortunately, resizing the actual charbuffer array is required. + char[] resized = new char[out.remaining()]; + out.get(resized); + return CharBuffer.wrap(resized); + } + + public final CoderResult decode (ByteBuffer in, CharBuffer out, + boolean endOfInput) + { + int newState = endOfInput ? STATE_END : STATE_CODING; + // XXX: Need to check for "previous step was an invocation [not] of + // this method with a value of true for the endOfInput parameter but + // a return value indicating an incomplete decoding operation" + // XXX: We will not check the previous return value, just + // that the previous call passed true for endOfInput + if (state != STATE_RESET && state != STATE_CODING + && !(endOfInput && state == STATE_END)) + throw new IllegalStateException (); + state = newState; + + for (;;) + { + CoderResult cr; + try + { + cr = decodeLoop (in, out); + } + catch (RuntimeException e) + { + throw new CoderMalfunctionError (e); + } + + if (cr.isOverflow ()) + return cr; + + if (cr.isUnderflow ()) + { + if (endOfInput && in.hasRemaining ()) + cr = CoderResult.malformedForLength (in.remaining ()); + else + return cr; + } + + CodingErrorAction action = cr.isMalformed () + ? malformedInputAction + : unmappableCharacterAction; + + if (action == CodingErrorAction.REPORT) + return cr; + + if (action == CodingErrorAction.REPLACE) + { + if (out.remaining () < replacement.length ()) + return CoderResult.OVERFLOW; + out.put (replacement); + } + + in.position (in.position () + cr.length ()); + } + } + + protected abstract CoderResult decodeLoop (ByteBuffer in, CharBuffer out); + + public Charset detectedCharset () + { + throw new UnsupportedOperationException (); + } + + public final CoderResult flush (CharBuffer out) + { + // It seems weird that you can flush after reset, but Sun's javadoc + // says an IllegalStateException is thrown "If the previous step of the + // current decoding operation was an invocation neither of the reset + // method nor ... of the three-argument decode method with a value of + // true for the endOfInput parameter." + // Further note that flush() only requires that there not be + // an IllegalStateException if the previous step was a call to + // decode with true as the last argument. It does not require + // that the call succeeded. decode() does require that it succeeded. + // XXX: test this to see if reality matches javadoc + if (state != STATE_RESET && state != STATE_END) + throw new IllegalStateException (); + + state = STATE_FLUSHED; + return implFlush (out); + } + + protected CoderResult implFlush (CharBuffer out) + { + return CoderResult.UNDERFLOW; + } + + public final CharsetDecoder onMalformedInput (CodingErrorAction newAction) + { + if (newAction == null) + throw new IllegalArgumentException ("Null action"); + + malformedInputAction = newAction; + implOnMalformedInput (newAction); + return this; + } + + protected void implOnMalformedInput (CodingErrorAction newAction) + { + // default implementation does nothing + } + + protected void implOnUnmappableCharacter (CodingErrorAction newAction) + { + // default implementation does nothing + } + + protected void implReplaceWith (String newReplacement) + { + // default implementation does nothing + } + + protected void implReset () + { + // default implementation does nothing + } + + public boolean isAutoDetecting () + { + return false; + } + + public boolean isCharsetDetected () + { + throw new UnsupportedOperationException (); + } + + public CodingErrorAction malformedInputAction () + { + return malformedInputAction; + } + + public final float maxCharsPerByte () + { + return maxCharsPerByte; + } + + public final CharsetDecoder onUnmappableCharacter + (CodingErrorAction newAction) + { + if (newAction == null) + throw new IllegalArgumentException ("Null action"); + + unmappableCharacterAction = newAction; + implOnUnmappableCharacter (newAction); + return this; + } + + public final String replacement () + { + return replacement; + } + + public final CharsetDecoder replaceWith (String newReplacement) + { + if (newReplacement == null) + throw new IllegalArgumentException ("Null replacement"); + if (newReplacement.length () == 0) + throw new IllegalArgumentException ("Empty replacement"); + // XXX: what about maxCharsPerByte? + + this.replacement = newReplacement; + implReplaceWith (newReplacement); + return this; + } + + public final CharsetDecoder reset () + { + state = STATE_RESET; + implReset (); + return this; + } + + public CodingErrorAction unmappableCharacterAction () + { + return unmappableCharacterAction; + } +} |