Showing the changes to java/pkg/sun/nio/cs/StreamEncoder.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,332 @@ | |||
| 1 | /* | ||
| 2 | * Copyright (c) 2001, 2005, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 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. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 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). | ||
| 16 | * | ||
| 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. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | /* | ||
| 27 | */ | ||
| 28 | |||
| 29 | package sun.nio.cs; | ||
| 30 | |||
| 31 | import java.io.*; | ||
| 32 | import java.nio.*; | ||
| 33 | import java.nio.channels.*; | ||
| 34 | import java.nio.charset.*; | ||
| 35 | |||
| 36 | public class StreamEncoder extends Writer | ||
| 37 | { | ||
| 38 | |||
| 39 | private static final int DEFAULT_BYTE_BUFFER_SIZE = 8192; | ||
| 40 | |||
| 41 | private volatile boolean isOpen = true; | ||
| 42 | |||
| 43 | private void ensureOpen() throws IOException { | ||
| 44 | if (!isOpen) | ||
| 45 | throw new IOException("Stream closed"); | ||
| 46 | } | ||
| 47 | |||
| 48 | // Factories for java.io.OutputStreamWriter | ||
| 49 | public static StreamEncoder forOutputStreamWriter(OutputStream out, | ||
| 50 | Object lock, | ||
| 51 | String charsetName) | ||
| 52 | throws UnsupportedEncodingException | ||
| 53 | { | ||
| 54 | String csn = charsetName; | ||
| 55 | if (csn == null) | ||
| 56 | csn = Charset.defaultCharset().name(); | ||
| 57 | try { | ||
| 58 | if (Charset.isSupported(csn)) | ||
| 59 | return new StreamEncoder(out, lock, Charset.forName(csn)); | ||
| 60 | } catch (IllegalCharsetNameException x) { } | ||
| 61 | throw new UnsupportedEncodingException (csn); | ||
| 62 | } | ||
| 63 | |||
| 64 | public static StreamEncoder forOutputStreamWriter(OutputStream out, | ||
| 65 | Object lock, | ||
| 66 | Charset cs) | ||
| 67 | { | ||
| 68 | return new StreamEncoder(out, lock, cs); | ||
| 69 | } | ||
| 70 | |||
| 71 | public static StreamEncoder forOutputStreamWriter(OutputStream out, | ||
| 72 | Object lock, | ||
| 73 | CharsetEncoder enc) | ||
| 74 | { | ||
| 75 | return new StreamEncoder(out, lock, enc); | ||
| 76 | } | ||
| 77 | |||
| 78 | |||
| 79 | // Factory for java.nio.channels.Channels.newWriter | ||
| 80 | |||
| 81 | public static StreamEncoder forEncoder(WritableByteChannel ch, | ||
| 82 | CharsetEncoder enc, | ||
| 83 | int minBufferCap) | ||
| 84 | { | ||
| 85 | return new StreamEncoder(ch, enc, minBufferCap); | ||
| 86 | } | ||
| 87 | |||
| 88 | |||
| 89 | // -- Public methods corresponding to those in OutputStreamWriter -- | ||
| 90 | |||
| 91 | // All synchronization and state/argument checking is done in these public | ||
| 92 | // methods; the concrete stream-encoder subclasses defined below need not | ||
| 93 | // do any such checking. | ||
| 94 | |||
| 95 | public String getEncoding() { | ||
| 96 | if (isOpen()) | ||
| 97 | return encodingName(); | ||
| 98 | return null; | ||
| 99 | } | ||
| 100 | |||
| 101 | public void flushBuffer() throws IOException { | ||
| 102 | synchronized (lock) { | ||
| 103 | if (isOpen()) | ||
| 104 | implFlushBuffer(); | ||
| 105 | else | ||
| 106 | throw new IOException("Stream closed"); | ||
| 107 | } | ||
| 108 | } | ||
| 109 | |||
| 110 | public void write(int c) throws IOException { | ||
| 111 | char cbuf[] = new char[1]; | ||
| 112 | cbuf[0] = (char) c; | ||
| 113 | write(cbuf, 0, 1); | ||
| 114 | } | ||
| 115 | |||
| 116 | public void write(char cbuf[], int off, int len) throws IOException { | ||
| 117 | synchronized (lock) { | ||
| 118 | ensureOpen(); | ||
| 119 | if ((off < 0) || (off > cbuf.length) || (len < 0) || | ||
| 120 | ((off + len) > cbuf.length) || ((off + len) < 0)) { | ||
| 121 | throw new IndexOutOfBoundsException(); | ||
| 122 | } else if (len == 0) { | ||
| 123 | return; | ||
| 124 | } | ||
| 125 | implWrite(cbuf, off, len); | ||
| 126 | } | ||
| 127 | } | ||
| 128 | |||
| 129 | public void write(String str, int off, int len) throws IOException { | ||
| 130 | /* Check the len before creating a char buffer */ | ||
| 131 | if (len < 0) | ||
| 132 | throw new IndexOutOfBoundsException(); | ||
| 133 | char cbuf[] = new char[len]; | ||
| 134 | str.getChars(off, off + len, cbuf, 0); | ||
| 135 | write(cbuf, 0, len); | ||
| 136 | } | ||
| 137 | |||
| 138 | public void flush() throws IOException { | ||
| 139 | synchronized (lock) { | ||
| 140 | ensureOpen(); | ||
| 141 | implFlush(); | ||
| 142 | } | ||
| 143 | } | ||
| 144 | |||
| 145 | public void close() throws IOException { | ||
| 146 | synchronized (lock) { | ||
| 147 | if (!isOpen) | ||
| 148 | return; | ||
| 149 | implClose(); | ||
| 150 | isOpen = false; | ||
| 151 | } | ||
| 152 | } | ||
| 153 | |||
| 154 | private boolean isOpen() { | ||
| 155 | return isOpen; | ||
| 156 | } | ||
| 157 | |||
| 158 | |||
| 159 | // -- Charset-based stream encoder impl -- | ||
| 160 | |||
| 161 | private Charset cs; | ||
| 162 | private CharsetEncoder encoder; | ||
| 163 | private ByteBuffer bb; | ||
| 164 | |||
| 165 | // Exactly one of these is non-null | ||
| 166 | private final OutputStream out; | ||
| 167 | private WritableByteChannel ch; | ||
| 168 | |||
| 169 | // Leftover first char in a surrogate pair | ||
| 170 | private boolean haveLeftoverChar = false; | ||
| 171 | private char leftoverChar; | ||
| 172 | private CharBuffer lcb = null; | ||
| 173 | |||
| 174 | private StreamEncoder(OutputStream out, Object lock, Charset cs) { | ||
| 175 | this(out, lock, | ||
| 176 | cs.newEncoder() | ||
| 177 | .onMalformedInput(CodingErrorAction.REPLACE) | ||
| 178 | .onUnmappableCharacter(CodingErrorAction.REPLACE)); | ||
| 179 | } | ||
| 180 | |||
| 181 | private StreamEncoder(OutputStream out, Object lock, CharsetEncoder enc) { | ||
| 182 | super(lock); | ||
| 183 | this.out = out; | ||
| 184 | this.ch = null; | ||
| 185 | this.cs = enc.charset(); | ||
| 186 | this.encoder = enc; | ||
| 187 | |||
| 188 | // This path disabled until direct buffers are faster | ||
| 189 | if (false && out instanceof FileOutputStream) { | ||
| 190 | ch = ((FileOutputStream)out).getChannel(); | ||
| 191 | if (ch != null) | ||
| 192 | bb = ByteBuffer.allocateDirect(DEFAULT_BYTE_BUFFER_SIZE); | ||
| 193 | } | ||
| 194 | if (ch == null) { | ||
| 195 | bb = ByteBuffer.allocate(DEFAULT_BYTE_BUFFER_SIZE); | ||
| 196 | } | ||
| 197 | } | ||
| 198 | |||
| 199 | private StreamEncoder(WritableByteChannel ch, CharsetEncoder enc, int mbc) { | ||
| 200 | this.out = null; | ||
| 201 | this.ch = ch; | ||
| 202 | this.cs = enc.charset(); | ||
| 203 | this.encoder = enc; | ||
| 204 | this.bb = ByteBuffer.allocate(mbc < 0 | ||
| 205 | ? DEFAULT_BYTE_BUFFER_SIZE | ||
| 206 | : mbc); | ||
| 207 | } | ||
| 208 | |||
| 209 | private void writeBytes() throws IOException { | ||
| 210 | bb.flip(); | ||
| 211 | int lim = bb.limit(); | ||
| 212 | int pos = bb.position(); | ||
| 213 | assert (pos <= lim); | ||
| 214 | int rem = (pos <= lim ? lim - pos : 0); | ||
| 215 | |||
| 216 | if (rem > 0) { | ||
| 217 | if (ch != null) { | ||
| 218 | if (ch.write(bb) != rem) | ||
| 219 | assert false : rem; | ||
| 220 | } else { | ||
| 221 | out.write(bb.array(), bb.arrayOffset() + pos, rem); | ||
| 222 | } | ||
| 223 | } | ||
| 224 | bb.clear(); | ||
| 225 | } | ||
| 226 | |||
| 227 | private void flushLeftoverChar(CharBuffer cb, boolean endOfInput) | ||
| 228 | throws IOException | ||
| 229 | { | ||
| 230 | if (!haveLeftoverChar && !endOfInput) | ||
| 231 | return; | ||
| 232 | if (lcb == null) | ||
| 233 | lcb = CharBuffer.allocate(2); | ||
| 234 | else | ||
| 235 | lcb.clear(); | ||
| 236 | if (haveLeftoverChar) | ||
| 237 | lcb.put(leftoverChar); | ||
| 238 | if ((cb != null) && cb.hasRemaining()) | ||
| 239 | lcb.put(cb.get()); | ||
| 240 | lcb.flip(); | ||
| 241 | while (lcb.hasRemaining() || endOfInput) { | ||
| 242 | CoderResult cr = encoder.encode(lcb, bb, endOfInput); | ||
| 243 | if (cr.isUnderflow()) { | ||
| 244 | if (lcb.hasRemaining()) { | ||
| 245 | leftoverChar = lcb.get(); | ||
| 246 | if (cb != null && cb.hasRemaining()) | ||
| 247 | flushLeftoverChar(cb, endOfInput); | ||
| 248 | return; | ||
| 249 | } | ||
| 250 | break; | ||
| 251 | } | ||
| 252 | if (cr.isOverflow()) { | ||
| 253 | assert bb.position() > 0; | ||
| 254 | writeBytes(); | ||
| 255 | continue; | ||
| 256 | } | ||
| 257 | cr.throwException(); | ||
| 258 | } | ||
| 259 | haveLeftoverChar = false; | ||
| 260 | } | ||
| 261 | |||
| 262 | void implWrite(char cbuf[], int off, int len) | ||
| 263 | throws IOException | ||
| 264 | { | ||
| 265 | CharBuffer cb = CharBuffer.wrap(cbuf, off, len); | ||
| 266 | |||
| 267 | if (haveLeftoverChar) | ||
| 268 | flushLeftoverChar(cb, false); | ||
| 269 | |||
| 270 | while (cb.hasRemaining()) { | ||
| 271 | CoderResult cr = encoder.encode(cb, bb, false); | ||
| 272 | if (cr.isUnderflow()) { | ||
| 273 | assert (cb.remaining() <= 1) : cb.remaining(); | ||
| 274 | if (cb.remaining() == 1) { | ||
| 275 | haveLeftoverChar = true; | ||
| 276 | leftoverChar = cb.get(); | ||
| 277 | } | ||
| 278 | break; | ||
| 279 | } | ||
| 280 | if (cr.isOverflow()) { | ||
| 281 | assert bb.position() > 0; | ||
| 282 | writeBytes(); | ||
| 283 | continue; | ||
| 284 | } | ||
| 285 | cr.throwException(); | ||
| 286 | } | ||
| 287 | } | ||
| 288 | |||
| 289 | void implFlushBuffer() throws IOException { | ||
| 290 | if (bb.position() > 0) | ||
| 291 | writeBytes(); | ||
| 292 | } | ||
| 293 | |||
| 294 | void implFlush() throws IOException { | ||
| 295 | implFlushBuffer(); | ||
| 296 | if (out != null) | ||
| 297 | out.flush(); | ||
| 298 | } | ||
| 299 | |||
| 300 | void implClose() throws IOException { | ||
| 301 | flushLeftoverChar(null, true); | ||
| 302 | try { | ||
| 303 | for (;;) { | ||
| 304 | CoderResult cr = encoder.flush(bb); | ||
| 305 | if (cr.isUnderflow()) | ||
| 306 | break; | ||
| 307 | if (cr.isOverflow()) { | ||
| 308 | assert bb.position() > 0; | ||
| 309 | writeBytes(); | ||
| 310 | continue; | ||
| 311 | } | ||
| 312 | cr.throwException(); | ||
| 313 | } | ||
| 314 | |||
| 315 | if (bb.position() > 0) | ||
| 316 | writeBytes(); | ||
| 317 | if (ch != null) | ||
| 318 | ch.close(); | ||
| 319 | else | ||
| 320 | out.close(); | ||
| 321 | } catch (IOException x) { | ||
| 322 | encoder.reset(); | ||
| 323 | throw x; | ||
| 324 | } | ||
| 325 | } | ||
| 326 | |||
| 327 | String encodingName() { | ||
| 328 | return ((cs instanceof HistoricallyNamedCharset) | ||
| 329 | ? ((HistoricallyNamedCharset)cs).historicalName() | ||
| 330 | : cs.name()); | ||
| 331 | } | ||
| 332 | } | ||