Source Code Cross Referenced for ToCharResponseStream.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » server » connection » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server resin 3.1.5 » resin » com.caucho.server.connection 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003:         *
004:         * This file is part of Resin(R) Open Source
005:         *
006:         * Each copy or derived work must preserve the copyright notice and this
007:         * notice unmodified.
008:         *
009:         * Resin Open Source is free software; you can redistribute it and/or modify
010:         * it under the terms of the GNU General Public License as published by
011:         * the Free Software Foundation; either version 2 of the License, or
012:         * (at your option) any later version.
013:         *
014:         * Resin Open Source is distributed in the hope that it will be useful,
015:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
016:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017:         * of NON-INFRINGEMENT.  See the GNU General Public License for more
018:         * details.
019:         *
020:         * You should have received a copy of the GNU General Public License
021:         * along with Resin Open Source; if not, write to the
022:         *
023:         *   Free Software Foundation, Inc.
024:         *   59 Temple Place, Suite 330
025:         *   Boston, MA 02111-1307  USA
026:         *
027:         * @author Scott Ferguson
028:         */
029:
030:        package com.caucho.server.connection;
031:
032:        import com.caucho.log.Log;
033:        import com.caucho.util.L10N;
034:        import com.caucho.vfs.Encoding;
035:        import com.caucho.vfs.TempCharBuffer;
036:
037:        import java.io.IOException;
038:        import java.io.InputStream;
039:        import java.io.Reader;
040:        import java.util.logging.Level;
041:        import java.util.logging.Logger;
042:
043:        abstract public class ToCharResponseStream extends
044:                AbstractResponseStream {
045:            static final Logger log = Log.open(ToCharResponseStream.class);
046:
047:            static final L10N L = new L10N(ToCharResponseStream.class);
048:
049:            private static final int SIZE = TempCharBuffer.SIZE;
050:
051:            private final byte[] _byteBuffer = new byte[SIZE];
052:
053:            // head of the expandable buffer
054:            private TempCharBuffer _head = TempCharBuffer.allocate();
055:            private TempCharBuffer _tail;
056:
057:            private char[] _charBuffer;
058:            private int _charLength;
059:
060:            private int _bufferCapacity;
061:            private int _bufferSize;
062:
063:            private BufferInputStream _in;
064:            private Reader _encodingReader;
065:
066:            public ToCharResponseStream() {
067:            }
068:
069:            /**
070:             * Initializes the Buffered Response stream at the beginning of a request.
071:             */
072:            public void start() {
073:                super .start();
074:
075:                _head.clear();
076:                _head.setNext(null);
077:                _tail = _head;
078:
079:                _charBuffer = _tail.getBuffer();
080:                _charLength = 0;
081:
082:                _bufferCapacity = SIZE;
083:                _bufferSize = 0;
084:
085:                _encodingReader = null;
086:                /*
087:                _autoFlush = true;
088:                _isClosed = false;
089:                 */
090:
091:                // _toChar = Encoding.getReadEncoding("ISO-8859-1");
092:            }
093:
094:            /**
095:             * Returns true for a caucho response stream.
096:             */
097:            public boolean isCauchoResponseStream() {
098:                return true;
099:            }
100:
101:            /**
102:             * Sets the buffer size.
103:             */
104:            public void setBufferSize(int size) {
105:                size = (size + SIZE - 1);
106:                size -= size % SIZE;
107:
108:                if (_bufferCapacity < size)
109:                    _bufferCapacity = size;
110:            }
111:
112:            /**
113:             * Gets the buffer size.
114:             */
115:            public int getBufferSize() {
116:                return _bufferCapacity;
117:            }
118:
119:            /**
120:             * Returns the remaining buffer entries.
121:             */
122:            public int getRemaining() {
123:                return _bufferCapacity - _bufferSize - _charLength;
124:            }
125:
126:            /**
127:             * Returns the char buffer.
128:             */
129:            public char[] getCharBuffer() {
130:                return _charBuffer;
131:            }
132:
133:            /**
134:             * Returns the char offset.
135:             */
136:            public int getCharOffset() {
137:                return _charLength;
138:            }
139:
140:            /**
141:             * Sets the char offset.
142:             */
143:            public void setCharOffset(int offset) throws IOException {
144:                _charLength = offset;
145:
146:                if (SIZE <= _charLength)
147:                    expandCharBuffer();
148:            }
149:
150:            /**
151:             * Converts the char buffer.
152:             */
153:            public char[] nextCharBuffer(int offset) throws IOException {
154:                _charLength = offset;
155:
156:                if (SIZE <= _charLength)
157:                    expandCharBuffer();
158:
159:                return _charBuffer;
160:            }
161:
162:            /**
163:             * Writes a character to the output.
164:             */
165:            public void print(int ch) throws IOException {
166:                /*
167:                if (_isClosed)
168:                  return;
169:                 */
170:                _charBuffer[_charLength++] = (char) ch;
171:
172:                if (SIZE <= _charLength)
173:                    expandCharBuffer();
174:            }
175:
176:            /**
177:             * Writes a char array to the output.
178:             */
179:            public void print(char[] buffer, int offset, int length)
180:                    throws IOException {
181:                /*
182:                if (_isHead || _isClosed)
183:                  return;
184:
185:                if (_byteLength > 0)
186:                  flushByteBuffer();
187:                 */
188:
189:                int charLength = _charLength;
190:                while (length > 0) {
191:                    int sublen = length;
192:                    if (SIZE - charLength < sublen)
193:                        sublen = SIZE - charLength;
194:
195:                    System.arraycopy(buffer, offset, _charBuffer, charLength,
196:                            sublen);
197:
198:                    offset += sublen;
199:                    length -= sublen;
200:                    charLength += sublen;
201:
202:                    if (SIZE <= charLength) {
203:                        _charLength = charLength;
204:                        expandCharBuffer();
205:                        charLength = _charLength;
206:                    }
207:                }
208:
209:                _charLength = charLength;
210:            }
211:
212:            /**
213:             * Returns the buffer offset.
214:             */
215:            public int getBufferOffset() {
216:                return 0;
217:            }
218:
219:            /**
220:             * Sets the byte buffer offset.
221:             */
222:            public void setBufferOffset(int offset) {
223:                if (offset > 0) {
224:                    try {
225:                        write(_byteBuffer, 0, offset);
226:                    } catch (IOException e) {
227:                        log.log(Level.FINE, e.toString(), e);
228:                    }
229:                }
230:            }
231:
232:            /**
233:             * Gets the byte buffer
234:             */
235:            public byte[] getBuffer() {
236:                return _byteBuffer;
237:            }
238:
239:            /**
240:             * Returns the next buffer.
241:             */
242:            public byte[] nextBuffer(int offset) throws IOException {
243:                if (offset > 0)
244:                    write(_byteBuffer, 0, offset);
245:
246:                return _byteBuffer;
247:            }
248:
249:            /**
250:             * Writes the next chunk of data to the response stream.
251:             *
252:             * @param buf the buffer containing the data
253:             * @param offset start offset into the buffer
254:             * @param length length of the data in the buffer
255:             */
256:            public void write(byte[] buf, int offset, int length)
257:                    throws IOException {
258:                if (length == 0)
259:                    return;
260:
261:                if (_encodingReader == null) {
262:                    // server/1b13
263:                    if (_in == null)
264:                        _in = new BufferInputStream();
265:                    _encodingReader = Encoding.getReadEncoding(_in,
266:                            getEncoding());
267:                }
268:
269:                // XXX: performance issues
270:                if (_encodingReader == null) {
271:                    for (; length > 0; length--) {
272:                        print((char) buf[offset++]);
273:                    }
274:                    return;
275:                }
276:
277:                _in.init(buf, offset, length);
278:
279:                // XXX: performance issues
280:                int ch;
281:                while ((ch = _encodingReader.read()) >= 0) {
282:                    print(ch);
283:                }
284:            }
285:
286:            /**
287:             * Writes the next chunk of data to the response stream.
288:             *
289:             * @param buf the buffer containing the data
290:             * @param offset start offset into the buffer
291:             * @param length length of the data in the buffer
292:             */
293:            public void write(int ch) throws IOException {
294:                if (_encodingReader == null) {
295:                    if (_in == null)
296:                        _in = new BufferInputStream();
297:                    _byteBuffer[0] = (byte) ch;
298:                    _encodingReader = Encoding.getReadEncoding(_in,
299:                            getEncoding());
300:
301:                    if (_encodingReader == null) {
302:                        print((char) ch);
303:                        return;
304:                    }
305:                }
306:
307:                _byteBuffer[0] = (byte) ch;
308:                _in.init(_byteBuffer, 0, 1);
309:
310:                while ((ch = _encodingReader.read()) >= 0) {
311:                    print(ch);
312:                }
313:            }
314:
315:            /**
316:             * Flushes the buffer.
317:             */
318:            public void flushBuffer() throws IOException {
319:                flushCharBuffer();
320:            }
321:
322:            /**
323:             * Flushes the buffer.
324:             */
325:            public void flushChar() throws IOException {
326:                flushCharBuffer();
327:            }
328:
329:            /**
330:             * Flushes or writes to the buffer.
331:             */
332:            private void expandCharBuffer() throws IOException {
333:                if (_bufferCapacity <= _bufferSize + _charLength) {
334:                    flushCharBuffer();
335:                } else if (_charLength == SIZE) {
336:                    _tail.setLength(_charLength);
337:                    _bufferSize += _charLength;
338:
339:                    TempCharBuffer tempBuf = TempCharBuffer.allocate();
340:                    _tail.setNext(tempBuf);
341:                    _tail = tempBuf;
342:
343:                    _charBuffer = _tail.getBuffer();
344:                    _charLength = 0;
345:                }
346:            }
347:
348:            /**
349:             * Flushes the buffered response to the output stream.
350:             */
351:            private void flushCharBuffer() throws IOException {
352:                _tail.setLength(_charLength);
353:                _bufferSize += _charLength;
354:                _charLength = 0;
355:
356:                TempCharBuffer ptr = _head;
357:                do {
358:                    _head = ptr;
359:
360:                    TempCharBuffer next = ptr.getNext();
361:                    ptr.setNext(null);
362:
363:                    writeNext(ptr.getBuffer(), 0, ptr.getLength());
364:
365:                    if (next != null)
366:                        TempCharBuffer.free(ptr);
367:
368:                    ptr = next;
369:                } while (ptr != null);
370:
371:                _tail = _head;
372:                _tail.setLength(0);
373:                _charBuffer = _tail.getBuffer();
374:                _bufferSize = 0;
375:            }
376:
377:            /**
378:             * Flushes the buffer.
379:             */
380:            public void clearBuffer() {
381:                _charLength = 0;
382:
383:                TempCharBuffer ptr = _head;
384:                do {
385:                    _head = ptr;
386:
387:                    TempCharBuffer next = ptr.getNext();
388:                    ptr.setNext(null);
389:
390:                    if (next != null)
391:                        TempCharBuffer.free(ptr);
392:
393:                    ptr = next;
394:                } while (ptr != null);
395:
396:                _tail = _head;
397:                _tail.setLength(0);
398:                _charBuffer = _head.getBuffer();
399:                _bufferSize = 0;
400:            }
401:
402:            /**
403:             * Returns the encoding.
404:             */
405:            abstract protected String getEncoding();
406:
407:            /**
408:             * Writes to the next.
409:             */
410:            abstract protected void writeNext(char[] buffer, int offset,
411:                    int length) throws IOException;
412:
413:            static class BufferInputStream extends InputStream {
414:                private byte[] _buffer;
415:                private int _offset;
416:                private int _length;
417:
418:                void init(byte[] buffer, int offset, int length) {
419:                    _buffer = buffer;
420:                    _offset = offset;
421:                    _length = length;
422:                }
423:
424:                public int read() {
425:                    if (_offset < _length)
426:                        return _buffer[_offset++] & 0xff;
427:                    else
428:                        return -1;
429:                }
430:            }
431:        }
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