Source Code Cross Referenced for DataOutputStream.java in  » Database-DBMS » Quadcap-Embeddable-Database » com » quadcap » sql » io » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » Quadcap Embeddable Database » com.quadcap.sql.io 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package com.quadcap.sql.io;
002:
003:        /* Copyright 1999 - 2003 Quadcap Software.  All rights reserved.
004:         *
005:         * This software is distributed under the Quadcap Free Software License.
006:         * This software may be used or modified for any purpose, personal or
007:         * commercial.  Open Source redistributions are permitted.  Commercial
008:         * redistribution of larger works derived from, or works which bundle
009:         * this software requires a "Commercial Redistribution License"; see
010:         * http://www.quadcap.com/purchase.
011:         *
012:         * Redistributions qualify as "Open Source" under  one of the following terms:
013:         *   
014:         *    Redistributions are made at no charge beyond the reasonable cost of
015:         *    materials and delivery.
016:         *
017:         *    Redistributions are accompanied by a copy of the Source Code or by an
018:         *    irrevocable offer to provide a copy of the Source Code for up to three
019:         *    years at the cost of materials and delivery.  Such redistributions
020:         *    must allow further use, modification, and redistribution of the Source
021:         *    Code under substantially the same terms as this license.
022:         *
023:         * Redistributions of source code must retain the copyright notices as they
024:         * appear in each source code file, these license terms, and the
025:         * disclaimer/limitation of liability set forth as paragraph 6 below.
026:         *
027:         * Redistributions in binary form must reproduce this Copyright Notice,
028:         * these license terms, and the disclaimer/limitation of liability set
029:         * forth as paragraph 6 below, in the documentation and/or other materials
030:         * provided with the distribution.
031:         *
032:         * The Software is provided on an "AS IS" basis.  No warranty is
033:         * provided that the Software is free of defects, or fit for a
034:         * particular purpose.  
035:         *
036:         * Limitation of Liability. Quadcap Software shall not be liable
037:         * for any damages suffered by the Licensee or any third party resulting
038:         * from use of the Software.
039:         */
040:
041:        import java.io.*;
042:
043:        import java.io.DataOutput;
044:        import java.io.IOException;
045:        import java.io.OutputStream;
046:
047:        import com.quadcap.util.Debug;
048:        import com.quadcap.util.Util;
049:
050:        /**
051:         * This class implements data output somewhat more efficiently than
052:         * the JDK version.  It also implements buffering and counting,
053:         * to help us avoid extra layers of stream classes.
054:         *
055:         * 4/2/03: XX What JDK version?  this hasn't been examined recently...
056:         *
057:         * @author Stan Bailes
058:         */
059:        public class DataOutputStream extends OutputStream implements 
060:                DataOutput {
061:            static final int MAX = 4096;
062:            OutputStream out;
063:            byte[] buf = new byte[MAX];
064:            byte[] tbuf = new byte[16];
065:            Object[] bufs = null;
066:            int bufsCnt = 0;
067:            int pos = 0;
068:            int siz = -1;
069:            int count = 0;
070:
071:            public DataOutputStream(OutputStream out) {
072:                this .out = out;
073:            }
074:
075:            public void reset(OutputStream out) {
076:                this .out = out;
077:                bufsCnt = 0;
078:                pos = 0;
079:                count = 0;
080:                siz = -1;
081:                if (bufs != null && bufs.length > 0) {
082:                    buf = (byte[]) bufs[0];
083:                }
084:            }
085:
086:            final Object[] resize(Object[] array, int size) {
087:                Object[] narray = new Object[size];
088:                System.arraycopy(array, 0, narray, 0, array.length);
089:                return narray;
090:            }
091:
092:            public final void writeBuf() throws IOException {
093:                //#ifdef DEBUG
094:                if (trace)
095:                    Debug.println("writeBuf(), buf = " + buf + ", bufsCnt = "
096:                            + bufsCnt);
097:                //#endif
098:
099:                if (out != null) {
100:                    //#ifdef DEBUG
101:                    if (trace)
102:                        Debug.println("-----------------------------write:\n "
103:                                + Util.strBytes(buf, 0, MAX));
104:                    //#endif
105:                    out.write(buf, 0, MAX);
106:                    count += MAX;
107:                } else {
108:                    if (bufs == null) {
109:                        bufs = new Object[8];
110:                    } else if (bufsCnt + 1 >= bufs.length) {
111:                        bufs = resize(bufs, bufsCnt * 2);
112:                    }
113:                    bufs[bufsCnt++] = buf;
114:                    buf = (byte[]) bufs[bufsCnt];
115:                    if (buf == null) {
116:                        buf = new byte[MAX];
117:                        bufs[bufsCnt] = buf;
118:                    }
119:                }
120:                pos = 0;
121:            }
122:
123:            public final void write(int c) throws IOException {
124:                //#ifdef DEBUG
125:                if (trace)
126:                    Debug.println("[" + pos + "]: write(" + c + ")");
127:                //#endif
128:                if (pos >= MAX) {
129:                    writeBuf();
130:                }
131:                buf[pos++] = (byte) c;
132:            }
133:
134:            public final void write(byte[] b) throws IOException {
135:                write(b, 0, b.length);
136:            }
137:
138:            public final void write(byte[] b, int off, int len)
139:                    throws IOException {
140:                //#ifdef DEBUG
141:                if (trace) {
142:                    Debug.println("[" + pos + "]: write("
143:                            + Util.strBytes(b, off, len) + ")");
144:                }
145:                //#endif
146:                if (out != null && len > MAX) {
147:                    flush();
148:                    out.write(b, off, len);
149:                    count += len;
150:                    return;
151:                }
152:                int npos = pos + len;
153:                while (npos >= MAX) {
154:                    final int slen = MAX - pos;
155:                    System.arraycopy(b, off, buf, pos, slen);
156:                    writeBuf();
157:                    len -= slen;
158:                    off += slen;
159:                    npos = pos + len;
160:                }
161:                if (len > 0) {
162:                    System.arraycopy(b, off, buf, pos, len);
163:                    pos = npos;
164:                }
165:            }
166:
167:            public final void writeBoolean(boolean v) throws IOException {
168:                write(v ? 1 : 0);
169:            }
170:
171:            public final void writeByte(int v) throws IOException {
172:                //#ifdef DEBUG
173:                if (trace)
174:                    Debug.println("writeByte(" + v + ")");
175:                //#endif        
176:                if (pos >= MAX)
177:                    writeBuf();
178:                buf[pos++] = (byte) v;
179:            }
180:
181:            //#ifdef SMALLDB
182:            public void writeLong(long v) throws IOException {
183:                while (true) {
184:                    if (pos >= MAX)
185:                        writeBuf();
186:                    if ((v & 0xffffffffffffff80L) != 0) {
187:                        buf[pos++] = (byte) (0x80 + (v & 0x7f));
188:                        v >>>= 7;
189:                    } else {
190:                        buf[pos++] = (byte) (v & 0x7f);
191:                        break;
192:                    }
193:                }
194:            }
195:
196:            public void writeInt(int v) throws IOException {
197:                //#ifdef DEBUG
198:                if (trace)
199:                    Debug.println("[" + pos + "].writeInt(" + v + ")");
200:                //#endif                
201:                while (true) {
202:                    if (pos >= MAX)
203:                        writeBuf();
204:                    if ((v & 0xffffff80) != 0) {
205:                        buf[pos++] = (byte) (0x80 + (v & 0x7f));
206:                        v >>>= 7;
207:                    } else {
208:                        buf[pos++] = (byte) (v & 0x7f);
209:                        break;
210:                    }
211:                }
212:            }
213:
214:            public void writeShort(int v) throws IOException {
215:                writeInt(v);
216:            }
217:
218:            public void writeChar(int v) throws IOException {
219:                writeInt(v);
220:            }
221:
222:            //#else
223:            //-    public final void writeShort(int v) throws IOException {
224:            //#ifdef DEBUG
225:            //-        if (trace) Debug.println("writeShort(" + v + ")");
226:            //#endif
227:            //-        if (pos + 1 >= MAX) {
228:            //-            if (pos >= MAX) writeBuf();
229:            //-            buf[pos++] = (byte)((v >>> 8) & 0xFF);
230:            //-            if (pos >= MAX) writeBuf();
231:            //-            buf[pos++] = (byte)((v >>> 0) & 0xFF);
232:            //-        } else {
233:            //-            buf[pos++] = (byte)((v >>> 8) & 0xFF);
234:            //-            buf[pos++] = (byte)((v >>> 0) & 0xFF);
235:            //-        }
236:            //-    }
237:            //-
238:            //-    public final void writeChar(int v) throws IOException {
239:            //-	writeShort(v);
240:            //-    }
241:            //-
242:            //-    public final void writeInt(int v) throws IOException {
243:            //#ifdef DEBUG
244:            //-        if (trace) Debug.println("writeInt(" + v + ") " +
245:            //-                                 Util.hexBytes(Util.bytes(v)));
246:            //#endif
247:            //-	tbuf[0] = (byte)((v >>> 24) & 0xFF);
248:            //-	tbuf[1] = (byte)((v >>> 16) & 0xFF);
249:            //-	tbuf[2] = (byte)((v >>> 8 ) & 0xFF);
250:            //-	tbuf[3] = (byte)((v >>> 0 ) & 0xFF);
251:            //-        write(tbuf, 0, 4);
252:            //-    }
253:            //-
254:            //-    public final void writeLong(long v) throws IOException {
255:            //#ifdef DEBUG
256:            //-        if (trace) Debug.println("writeLong(" + v + ")");
257:            //#endif
258:            //-        
259:            //-	tbuf[0] = (byte)((v >>> 56) & 0xFF);
260:            //-	tbuf[1] = (byte)((v >>> 48) & 0xFF);
261:            //-	tbuf[2] = (byte)((v >>> 40) & 0xFF);
262:            //-	tbuf[3] = (byte)((v >>> 32) & 0xFF);
263:            //-	tbuf[4] = (byte)((v >>> 24) & 0xFF);
264:            //-	tbuf[5] = (byte)((v >>> 16) & 0xFF);
265:            //-	tbuf[6] = (byte)((v >>> 8 ) & 0xFF);
266:            //-	tbuf[7] = (byte)((v >>> 0 ) & 0xFF);
267:            //-	write(tbuf, 0, 8);
268:            //-    }
269:            //#endif
270:
271:            public final void writeFloat(float v) throws IOException {
272:                writeInt(Float.floatToIntBits(v));
273:            }
274:
275:            public final void writeDouble(double v) throws IOException {
276:                writeLong(Double.doubleToLongBits(v));
277:            }
278:
279:            public final void writeBytes(String s) throws IOException {
280:                //#ifdef DEBUG
281:                if (trace)
282:                    Debug.println("writeBytes(" + s + ")");
283:                //#endif
284:                int len = s.length();
285:                int off = 0;
286:                while (len + pos >= MAX) {
287:                    int slen = MAX - pos;
288:                    s.getBytes(off, off + slen, buf, pos);
289:                    writeBuf();
290:                    off += slen;
291:                    len -= slen;
292:                }
293:                if (len > 0) {
294:                    s.getBytes(off, len, buf, pos);
295:                    pos += len;
296:                }
297:            }
298:
299:            public final void writeChars(String s) throws IOException {
300:                //#ifdef DEBUG
301:                if (trace)
302:                    Debug.println("writeChars(" + s + ")");
303:                //#endif
304:                final int len = s.length();
305:                for (int i = 0; i < len; i++) {
306:                    int v = s.charAt(i);
307:                    writeChar(v);
308:                }
309:            }
310:
311:            public final void writeUTF(String str) throws IOException {
312:                throw new IOException("UTF write not implemented");
313:            }
314:
315:            public final void flush() throws IOException {
316:                if (out != null) {
317:                    //#ifdef DEBUG
318:                    if (trace)
319:                        Debug.println("flush, pos = " + pos);
320:                    //#endif
321:                    if (pos > 0) {
322:                        //#ifdef DEBUG
323:                        if (trace)
324:                            Debug.println("flush(" + pos + "): "
325:                                    + Util.strBytes(buf, 0, pos));
326:                        //#endif      
327:                        out.write(buf, 0, pos);
328:                        count += pos;
329:                        pos = 0;
330:                    }
331:                    out.flush();
332:                }
333:            }
334:
335:            public final void close() throws IOException {
336:                flush();
337:                if (out != null)
338:                    out.close();
339:            }
340:
341:            public int size() {
342:                int s = bufsCnt * MAX + pos;
343:                if (siz >= 0) {
344:                    if (s > siz)
345:                        siz = -1;
346:                    else
347:                        s = siz;
348:                }
349:                return s;
350:            }
351:
352:            public final void setCount(int count) {
353:                this .count = count;
354:            }
355:
356:            public final int getCount() {
357:                if (out == null) {
358:                    return count;
359:                } else {
360:                    return count + size();
361:                }
362:            }
363:
364:            public final void setPosition(int p) {
365:                //#ifdef DEBUG
366:                if (trace)
367:                    Debug.println("setPosition(" + p + ")");
368:                //#endif
369:                int s = size();
370:                if (p < s && s > siz)
371:                    siz = s;
372:                bufsCnt = p / MAX;
373:                pos = p % MAX;
374:                if (bufs != null) {
375:                    buf = (byte[]) bufs[bufsCnt];
376:                }
377:            }
378:
379:            public final int getPosition() {
380:                return size();
381:            }
382:
383:            public byte[] toByteArray() {
384:                int len = size();
385:                setPosition(len);
386:                byte[] ret = new byte[len];
387:                int p = 0;
388:                for (int i = 0; i < bufsCnt; i++) {
389:                    byte[] b = (byte[]) bufs[i];
390:                    System.arraycopy(b, 0, ret, p, Math.min(MAX, len));
391:                    p += MAX;
392:                    len -= MAX;
393:                }
394:                if (buf != null) {
395:                    System.arraycopy(buf, 0, ret, p, pos);
396:                }
397:                return ret;
398:            }
399:
400:            //#ifdef DEBUG
401:            public static void test1() throws IOException {
402:                FileOutputStream fos = new FileOutputStream("dos.out");
403:                ObjectOutputStream oos = new ObjectOutputStream(fos);
404:                byte[] bufx = new byte[2000];
405:                for (int i = 0; i < bufx.length; i++) {
406:                    bufx[i] = (byte) (i & 0xff);
407:                }
408:                int cnt = 0;
409:                for (int i = 1; i < bufx.length; i++) {
410:                    oos.write(bufx, 0, i);
411:                    cnt += i;
412:                    if (cnt != oos.getCount())
413:                        throw new RuntimeException("bad count, i = " + i);
414:                    oos.flush();
415:
416:                }
417:                oos.flush();
418:                fos.close();
419:
420:                FileInputStream fis = new FileInputStream("dos.out");
421:                BufferedInputStream bis = new BufferedInputStream(fis);
422:                for (int i = 1; i < bufx.length; i++) {
423:                    bis.read(bufx, 0, i);
424:                    for (int j = 0; j < i; j++) {
425:                        if ((bufx[j] & 0xff) != (j & 0xff)) {
426:                            throw new RuntimeException("bad, i = " + i
427:                                    + ", j = " + j);
428:                        }
429:                    }
430:                }
431:                fis.close();
432:            }
433:
434:            public static void main(String args[]) {
435:                try {
436:                    //              ObjectOutputStream out = new ObjectOutputStream();
437:                    //              out.setPosition(6);
438:                    //              out.writeInt(0xaabbccdd);
439:                    //              out.setPosition(0);
440:                    //              out.writeInt(0xffeeddcc);
441:                    //              for (int i = 0; i < 2000; i++) {
442:                    //                  out.writeInt(i);
443:                    //              }
444:                    //              out.setPosition(0);
445:                    //              out.writeInt(0x11223344);
446:                    //              out.writeInt(0x55667788);
447:                    //              System.out.println(Util.strBytes(out.toByteArray()));
448:                    test1();
449:                } catch (Throwable t) {
450:                    Debug.print(t);
451:                }
452:            }
453:
454:            boolean trace = false;
455:
456:            public void setTrace(boolean t) {
457:                this .trace = t;
458:            }
459:            //#endif
460:        }
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