Source Code Cross Referenced for Packet.java in  » 6.0-JDK-Modules » j2me » com » sun » cldchi » tools » memoryprofiler » jdwp » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » com.sun.cldchi.tools.memoryprofiler.jdwp 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *   
003:         *
004:         * Copyright  1990-2007 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation.
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt).
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions.
025:         */
026:
027:        package com.sun.cldchi.tools.memoryprofiler.jdwp;
028:
029:        import java.util.Vector;
030:
031:        /**
032:         * This class encapsulates JDWP packet. It based on
033:         * <code>ByteBuffer</code> but adds methods for working with data
034:         * specific for JDWP packet. This class is not used directly, its subclasses
035:         * <code>Command</code> and <code>Reply</code> are used instead. For
036:         * information about JDWP packet see JDWP specification.
037:         *
038:         * @see jdwp.ByteBuffer
039:         * @see jdwp.Command
040:         * @see jdwp.Reply
041:         */
042:        class Packet extends ByteBuffer {
043:
044:            /**
045:             * JDWP packet flag "no flags". Indicates that the packet is a command.
046:             */
047:            public final static int flNoFlags = 0x0;
048:
049:            /**
050:             * JDWP packet flag <code>Reply</code>. Indicates that the packet is a 
051:             * reply.
052:             */
053:            public final static int flReply = 0x80;
054:
055:            /**
056:             * Offset of the "packet length" field in the JDWP packet.
057:             */
058:            public final static int LengthOffset = 0;
059:
060:            /**
061:             * Offset of the "packet ID" field in the JDWP packet.
062:             */
063:            public final static int IdOffset = 4;
064:
065:            /**
066:             * Offset of the "flags" field in the JDWP packet.
067:             */
068:            public final static int FlagsOffset = 8;
069:
070:            /**
071:             * Offset of the "command number" field in the JDWP packet.
072:             */
073:            public final static int CommandOffset = 9;
074:
075:            /**
076:             * Offset of the "error code" field in the JDWP packet.
077:             */
078:            public final static int ErrorCodeOffset = 9;
079:
080:            /**
081:             * Size of JDWP packet's header.
082:             */
083:            public final static int PacketHeaderSize = 11;
084:
085:            /**
086:             * Create a new JDWP packet fills its header by zeros.
087:             */
088:            public Packet() {
089:                super ();
090:                while (length() < PacketHeaderSize) {
091:                    addByte(0);
092:                }
093:            }
094:
095:            /**
096:             * Sets "packet length" field of the JDWP packet
097:             */
098:            public void setLength() {
099:                try {
100:                    putInt(LengthOffset, length());
101:                } catch (BoundException e) {
102:                }
103:                ;
104:            }
105:
106:            /**
107:             * Returns ID of the JDWP packet.
108:             *
109:             * @return ID of the JDWP packet
110:             */
111:            public int getID() {
112:                int id = 0;
113:
114:                try {
115:                    id = getInt(IdOffset);
116:                } catch (BoundException e) {
117:                }
118:                ;
119:                return id;
120:            }
121:
122:            /**
123:             * Sets ID of the JDWP packet.
124:             *
125:             * @param Id ID of the JDWP packet
126:             */
127:            public void setID(int Id) {
128:                try {
129:                    putInt(IdOffset, Id);
130:                } catch (BoundException e) {
131:                }
132:                ;
133:            }
134:
135:            /**
136:             * Returns flags of the JDWP packet.
137:             *
138:             * @return flags of the JDWP packet.
139:             */
140:            public int getFlags() {
141:                return bytes[FlagsOffset] & 0xff;
142:            }
143:
144:            /**
145:             * Sets flags of the JDWP packet.
146:             *
147:             * @param Flags flags to be set
148:             */
149:            public void setFlags(int Flags) {
150:                bytes[FlagsOffset] = (byte) (Flags & 0xFF);
151:            }
152:
153:            /**
154:             * Moves the reading marker to the beginning of packet data
155:             * (after the header). To learn about reading marker see
156:             * <code>ByteBuffer</code>.
157:             *
158:             * @see jdwp.ByteBuffer
159:             */
160:            public void resetDataParser() {
161:                resetParser(PacketHeaderSize);
162:            }
163:
164:            /**
165:             * Returns size of packet's data (i.e., size of the packet
166:             * excluding header). 
167:             *
168:             * @return size of packet's data
169:             */
170:            public int getDataSize() {
171:                return length() - PacketHeaderSize;
172:            }
173:
174:            /**
175:             * Adds a field ID to the end of JDWP packet.
176:             *
177:             * @param b ID to be added
178:             */
179:            public void addFieldID(long b) {
180:                addID(b, jdwp.fieldIDSize);
181:            }
182:
183:            /**
184:             * Adds a method ID to the end of JDWP packet.
185:             *
186:             * @param b ID to be added
187:             */
188:            public void addMethodID(long b) {
189:                addID(b, jdwp.methodIDSize);
190:            }
191:
192:            /**
193:             * Adds an object ID to the end of JDWP packet.
194:             *
195:             * @param b ID to be added
196:             */
197:            public void addObjectID(long b) {
198:                addID(b, jdwp.objectIDSize);
199:            }
200:
201:            /**
202:             * Adds a reference type ID to the end of JDWP packet.
203:             *
204:             * @param b ID to be added
205:             */
206:            public void addReferenceTypeID(long b) {
207:                addID(b, jdwp.referenceTypeIDSize);
208:            }
209:
210:            /**
211:             * Adds a frame ID to the end of JDWP packet.
212:             *
213:             * @param b ID to be added
214:             */
215:            public void addFrameID(long b) {
216:                addID(b, jdwp.frameIDSize);
217:            }
218:
219:            /**
220:             * Tries to read next field ID from the buffer.
221:             * Value is read is one
222:             * that is pointed by reading marker. After completing the operation
223:             * the reading marker is incremented. 
224:             *     
225:             * @return current field ID from the buffer
226:             * @throws BoundException if value to be read is outside the filled area
227:             */
228:            public long getFieldID() throws BoundException {
229:                return getID(jdwp.fieldIDSize);
230:            }
231:
232:            /**
233:             * Tries to read next method ID from the buffer.
234:             * Value is read is one
235:             * that is pointed by reading marker. After completing the operation
236:             * the reading marker is incremented. 
237:             *     
238:             * @return current method ID from the buffer
239:             * @throws BoundException if value to be read is outside the filled area
240:             */
241:            public long getMethodID() throws BoundException {
242:                return getID(jdwp.methodIDSize);
243:            }
244:
245:            /**
246:             * Tries to read next object ID from the buffer.
247:             * Value is read is one
248:             * that is pointed by reading marker. After completing the operation
249:             * the reading marker is incremented. 
250:             *     
251:             * @return current object ID from the buffer
252:             * @throws BoundException if value to be read is outside the filled area
253:             */
254:            public long getObjectID() throws BoundException {
255:                return getID(jdwp.objectIDSize);
256:            }
257:
258:            /**
259:             * Tries to read next reference type ID from the buffer.
260:             * Value is read is one
261:             * that is pointed by reading marker. After completing the operation
262:             * the reading marker is incremented. 
263:             *     
264:             * @return current reference type ID from the buffer
265:             * @throws BoundException if value to be read is outside the filled area
266:             */
267:            public long getReferenceTypeID() throws BoundException {
268:                return getID(jdwp.referenceTypeIDSize);
269:            }
270:
271:            /**
272:             * Tries to read next frame ID from the buffer.
273:             * Value is read is one
274:             * that is pointed by reading marker. After completing the operation
275:             * the reading marker is incremented. 
276:             *     
277:             * @return current frame ID from the buffer
278:             * @throws BoundException if value to be read is outside the filled area
279:             */
280:            public long getFrameID() throws BoundException {
281:                return getID(jdwp.frameIDSize);
282:            }
283:
284:            /**
285:             * Parses the JDWP packet according to the specified mask. The mask
286:             * specifies what elements are contained in JDWP packet's data. The rules
287:             * are as follows:
288:             * <ul>
289:             * <li> b - a byte value
290:             * <li> i - an int value
291:             * <li> S - a short value
292:             * <li> l - a long value
293:             * <li> s - a string value
294:             * <li> f - a field ID
295:             * <li> m - a method ID
296:             * <li> o - an object ID
297:             * <li> r - a reference type ID
298:             * <li> F - a frame ID
299:             * <li> v - a value. The first byte indicates type tag of the
300:             * variable, the second is a variable's value.
301:             * <li> . - a set of data in the end of packet that should not be parsed.
302:             * <li> i(&lt;submask&gt;) - the first integer indicates how many times
303:             * submask is appeared in the packet.
304:             * </ul>
305:             * For example, the mask <code>li(rm)</code> means that the first element
306:             * of packet's data is a <code>long</code> value, then an <code>int</code>
307:             * value that indicates how many times the pair "reference type ID - 
308:             * method ID" is appeared later.
309:             *
310:             * @param how a mask that indicates how to parse a packet.
311:             * @return a vector of parsed elements of the packet's data. The classes
312:             * that represent different types of elements are written below:
313:             * <ul>
314:             * <li> b - <code>java.lang.Integer</code>
315:             * <li> i - <code>java.lang.Integer</code>
316:             * <li> S - <code>java.lang.Integer</code>
317:             * <li> l - <code>java.lang.Long</code>
318:             * <li> s - <code>java.lang.String</code>
319:             * <li> f - <code>java.lang.Long</code>
320:             * <li> m - <code>java.lang.Long</code>
321:             * <li> o - <code>java.lang.Long</code>
322:             * <li> r - <code>java.lang.Long</code>
323:             * <li> F - <code>java.lang.Long</code>
324:             * <li> v - The tag of the value is represented by
325:             * <code>java.lang.Integer</code>. The value itself is represented
326:             * according to this table
327:             * </ul>
328:             */
329:            public Vector parse(String how) throws BoundException {
330:
331:                boolean check;
332:                check = (how.indexOf('.') == -1);
333:
334:                if (!check) {
335:                    if (how.indexOf('.') != how.length() - 1)
336:                        throw new BoundException();
337:                    how = Tools.Left(how, how.length() - 1);
338:                }
339:
340:                Vector v = new Vector();
341:                resetDataParser();
342:                doParse(how, v);
343:
344:                if (check && (!isParsed()))
345:                    throw new BoundException();
346:                return v;
347:            }
348:
349:            /**
350:             * Performs the parsing of the JDWP oacket in fact. The all the
351:             * parsing rules that described in the description of
352:             * <code>parse</code> method are the same besides of absence of
353:             * '.' symbol in the mask.
354:             *
355:             * @param how a mask that describes types of elements
356:             * @param v a vector for keeping results
357:             *
358:             * @see #parse(java.lang.String)
359:             */
360:            private void doParse(String how, Vector v) throws BoundException {
361:
362:                int index = 0;
363:                char[] h = how.toCharArray();
364:
365:                while (index < h.length) {
366:                    switch (h[index]) {
367:                    case 'b':
368:                        v.add(new Integer(getByte()));
369:                        break;
370:                    case 'i':
371:                        v.add(new Integer(getInt()));
372:                        break;
373:                    case 'S':
374:                        v.add(new Integer(getShort()));
375:                        break;
376:                    case 'l':
377:                        v.add(new Long(getLong()));
378:                        break;
379:                    case 's':
380:                        v.add(getString());
381:                        break;
382:                    case 'f':
383:                        v.add(new Long(getFieldID()));
384:                        break;
385:                    case 'm':
386:                        v.add(new Long(getMethodID()));
387:                        break;
388:                    case 'o':
389:                        v.add(new Long(getObjectID()));
390:                        break;
391:                    case 'r':
392:                        v.add(new Long(getReferenceTypeID()));
393:                        break;
394:                    case 'F':
395:                        v.add(new Long(getFrameID()));
396:                        break;
397:                    case 'v':
398:                        int vtype = getByte();
399:                        v.add(new Integer(vtype));
400:                        switch (vtype) {
401:                        case jdwp.tagARRAY:
402:                        case jdwp.tagOBJECT:
403:                            v.add(new Long(getObjectID()));
404:                            break;
405:                        case jdwp.tagBYTE:
406:                            v.add(new Integer(getByte()));
407:                            break;
408:                        case jdwp.tagINT:
409:                            v.add(new Integer(getInt()));
410:                            break;
411:                        case jdwp.tagSHORT:
412:                            v.add(new Integer(getShort()));
413:                            break;
414:                        case jdwp.tagVOID:
415:                            v.add("void value");
416:                            break;
417:                        case jdwp.tagBOOLEAN:
418:                            v.add(new Integer(getByte()));
419:                            break;
420:                        case jdwp.tagLONG:
421:                            v.add(new Long(getLong()));
422:                            break;
423:                        default:
424:                            throw new BoundException();
425:                        }
426:                        break;
427:
428:                    case '(':
429:                        if (index == 0)
430:                            throw new BoundException();
431:
432:                        if (h[index - 1] != 'i')
433:                            throw new BoundException();
434:
435:                        int n = ((Integer) v.elementAt(v.size() - 1))
436:                                .intValue();
437:
438:                        if (n < 0)
439:                            throw new BoundException();
440:                        int pos = index + 1;
441:                        int cnt = 1;
442:                        int last = -1;
443:                        while (pos < h.length) {
444:                            if (h[pos] == '(')
445:                                cnt++;
446:
447:                            if (h[pos] == ')') {
448:                                cnt--;
449:                                if (cnt == 0) {
450:                                    last = pos;
451:                                    break;
452:                                }
453:                            }
454:                            pos++;
455:                        }
456:
457:                        if (last == -1)
458:                            throw new BoundException();
459:
460:                        String s = new String(h, index + 1, last - index - 1);
461:                        for (int i = 0; i < n; i++)
462:                            doParse(s, v);
463:                        index = last;
464:                        break;
465:
466:                    default:
467:                        throw new BoundException();
468:                    }
469:                    index++;
470:                }
471:            }
472:        }
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