Source Code Cross Referenced for DataCommon.java in  » Ajax » Laszlo-4.0.10 » org » openlaszlo » xml » internal » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Ajax » Laszlo 4.0.10 » org.openlaszlo.xml.internal 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* ****************************************************************************
002:         * DataCommon.java
003:         *
004:         * Compile XML directly to SWF bytecodes.
005:         * ****************************************************************************/
006:
007:        /* J_LZ_COPYRIGHT_BEGIN *******************************************************
008:         * Copyright 2001-2006 Laszlo Systems, Inc.  All Rights Reserved.              *
009:         * Use is subject to license terms.                                            *
010:         * J_LZ_COPYRIGHT_END *********************************************************/
011:
012:        package org.openlaszlo.xml.internal;
013:
014:        import java.io.*;
015:        import java.util.*;
016:
017:        import org.openlaszlo.iv.flash.util.*;
018:        import org.openlaszlo.iv.flash.api.action.*;
019:        import org.openlaszlo.iv.flash.api.*;
020:        import org.openlaszlo.compiler.CompilationError;
021:        import org.openlaszlo.utils.ChainedException;
022:        import org.openlaszlo.utils.FileUtils;
023:        import org.openlaszlo.utils.HashIntTable;
024:
025:        import org.apache.log4j.*;
026:
027:        /**
028:         * Common data compiler routines between DataCompiler (XML compiler) and DataBuilder (Java API)
029:         *
030:         * @author Henry Minsky
031:         * @version 1.0
032:         */
033:        public abstract class DataCommon {
034:            /* Logger */
035:            static public String ROOT_NODE_INSTANTIATOR_FN = "_rootndi";
036:            static public String RESULTSET_NODE_INSTANTIATOR_FN = "_resultsetndi";
037:            static public String BODY_NODE_INSTANTIATOR_FN = "_bodyndi";
038:            static public String NODE_INSTANTIATOR_FN = "_m";
039:            static public String TEXT_INSTANTIATOR_FN = "_t";
040:            static public String ROOT_NODE_FINAL_FN = "_finishndi";
041:
042:            /**
043:             * Push a reference to string data on stack. maybeInternString
044:             * uses a heuristic to decide whether to add the string constant
045:             * pool, so this may push a string literal or a dictionary ref.
046:             */
047:            static public final void pushStringData(String s, FlashBuffer body,
048:                    DataContext dc) {
049:                int idx = maybeInternString(s, dc);
050:                if (idx != -1) {
051:                    //System.out.println("intern IDX '"+s+"'="+idx);
052:                    // PUSH idx
053:                    body.writeByte(Actions.PushData);
054:                    body.writeWord(2);
055:                    writeOffset(idx, body);
056:                } else {
057:                    //            System.out.println("intern LITERAL '"+s+"'");
058:                    // PUSH literal attrname
059:                    // {0x96, lenlo, lenhi, 0x00, char, char, char, ...0x00, }
060:                    body.writeByte(Actions.PushData);
061:                    body.writeWord(getByteLength(s, dc.encoding) + 2); // account for type code and zero terminator
062:                    body.writeByte(0); // type code 0 ; null terminated string type
063:                    body.writeStringZ(s, dc.encoding);
064:                }
065:            }
066:
067:            static public int getByteLength(String s, String encoding) {
068:                try {
069:                    byte buf[] = s.getBytes(encoding);
070:                    return buf.length;
071:                } catch (UnsupportedEncodingException e) {
072:                    throw new RuntimeException(
073:                            "Got UnsupportedEncodingException for charset "
074:                                    + encoding + " on string '" + s + "': "
075:                                    + e.getMessage());
076:                }
077:            }
078:
079:            /**
080:             * Push a reference to string data on stack. maybeInternString
081:             * uses a heuristic to decide whether to add the string constant
082:             * pool, so this may push a string literal or a dictionary ref.
083:             *
084:             * This version of the method uses the faster _writeXXX() methods,
085:             * which do not do bounds checks on the FlashBuffer. So this should only be
086:             * used in situations where we know the FlashBuffer is already allocated with
087:             * enough space for any data we may push.
088:             */
089:            static public final void _pushStringData(String s,
090:                    FlashBuffer body, DataContext dc) {
091:                int idx = maybeInternString(s, dc);
092:                if (idx != -1) {
093:                    //System.out.println("intern IDX '"+s+"'="+idx);
094:                    // PUSH idx
095:                    body._writeByte(Actions.PushData);
096:                    body._writeWord(2);
097:                    writeOffset(idx, body);
098:                } else {
099:                    //            System.out.println("intern LITERAL '"+s+"'");
100:                    // PUSH literal attrname
101:                    // {0x96, lenlo, lenhi, 0x00, char, char, char, ...0x00, }
102:                    body._writeByte(Actions.PushData);
103:                    body._writeWord(getByteLength(s, dc.encoding) + 2); // account for type code and zero terminator
104:                    body._writeByte(0); // type code 0 ; null terminated string type
105:                    body._writeStringZ(s, dc.encoding);
106:                }
107:            }
108:
109:            /**
110:             * Push a reference to string data on stack. maybeInternString
111:             * uses a heuristic to decide whether to add the string constant
112:             * pool, so this may push a string literal or a dictionary ref.
113:             *
114:             *<p>
115:             *
116:             * This method is used when composing the arguments for a PUSH
117:             * merges several args on the stack with a single PUSH
118:             * instruction, and writes out only the data or constant-pool
119:             * index reference, as opposed to the pushStringData() method
120:             * which also writes out the PUSH instruction itsef.
121:             *
122:             */
123:
124:            static public final void pushMergedStringData(String s,
125:                    FlashBuffer body, DataContext dc) {
126:                int idx = maybeInternString(s, dc);
127:                if (idx != -1) {
128:                    //System.out.println("intern IDX '"+s+"'="+idx);
129:                    writeOffset(idx, body);
130:                } else {
131:                    //            System.out.println("intern LITERAL '"+s+"'");
132:                    body.writeByte(0); // type code 0 ; null terminated
133:                    // string type
134:                    body.writeStringZ(s, dc.encoding);
135:                }
136:            }
137:
138:            /**
139:             * Push a reference to string data on stack. maybeInternString
140:             * uses a heuristic to decide whether to add the string constant
141:             * pool, so this may push a string literal or a dictionary ref.
142:             *
143:             *<p>
144:             * 
145:             *
146:             * This version of the method uses the faster _writeXXX() methods,
147:             * which do not do bounds checks on the FlashBuffer. So this should only be
148:             * used in situations where we know the FlashBuffer is already allocated with
149:             * enough space for any data we may push.
150:             */
151:
152:            static public final void _pushMergedStringData(String s,
153:                    FlashBuffer body, DataContext dc) {
154:                int idx = maybeInternString(s, dc);
155:                if (idx != -1) {
156:                    //System.out.println("intern IDX '"+s+"'="+idx);
157:                    _writeOffset(idx, body);
158:                } else {
159:                    //            System.out.println("intern LITERAL '"+s+"'");
160:                    body._writeByte(0); // type code 0 ; null terminated
161:                    // string type
162:                    body._writeStringZ(s, dc.encoding);
163:                }
164:            }
165:
166:            /**
167:             * Push a reference to string data on stack. Always attempts to intern in the string 
168:             * pool, so this may push a string literal or a dictionary ref.
169:             *
170:             * <p>
171:             *
172:             * This method is designed to be called when pushing references to strings
173:             * which we are pretty sure will occur again, such as tag names or attribute names.
174:             * We try to put them into the string pool immediately, as opposed to using the
175:             * heuristic of waiting until the string is seen again before interning it.
176:             *
177:             */
178:            static public final void pushMergedStringDataSymbol(String s,
179:                    FlashBuffer body, DataContext dc) {
180:                int idx = internString(s, dc);
181:                if (idx != -1) {
182:                    //System.out.println("intern IDX '"+s+"'="+idx);
183:                    writeOffset(idx, body);
184:                } else {
185:                    //            System.out.println("intern LITERAL '"+s+"'");
186:                    body.writeByte(0); // type code 0 ; null terminated
187:                    // string type
188:                    body.writeStringZ(s, dc.encoding);
189:                }
190:            }
191:
192:            /**
193:             * Push a reference to string data on stack. Attempts to intern in the string pool
194:             * pool, so this may push a string literal or a dictionary ref. This routine uses the _writeXXX routines,
195:             * which bypass FlashBuffer's ensureCapacity(), so the FlashBuffer must have been allocated with enough
196:             * space for these writes, or an ArrayBoundsException may happen.
197:             *
198:             */
199:            static public final void _pushMergedStringDataSymbol(String s,
200:                    FlashBuffer body, DataContext dc) {
201:                int idx = internString(s, dc);
202:                if (idx != -1) {
203:                    //System.out.println("intern IDX '"+s+"'="+idx);
204:                    writeOffset(idx, body);
205:                } else {
206:                    //            System.out.println("intern LITERAL '"+s+"'");
207:                    body._writeByte(0); // type code 0 ; null terminated
208:                    // string type
209:                    body._writeStringZ(s, dc.encoding);
210:                }
211:            }
212:
213:            /**
214:             * Copy data from a a byte array into a FlashBuffer 
215:             */
216:            static public final void writeFlashData(FlashBuffer body,
217:                    byte[] data, int destPos) {
218:                //arraycopy(Object src, int srcPos, Object dest, int destPos, int length) 
219:                byte[] buf = body.getBuf();
220:                System.arraycopy(data, 0, buf, destPos, data.length);
221:                body.setPos(destPos + data.length);
222:            }
223:
224:            /**
225:             * Return byte array containing the strings from the constant pool, sorted and zero terminated.
226:             */
227:            final static public byte[] makeStringPool(DataContext dc) {
228:                HashIntTable pool = dc.cpool;
229:                // Array for sorting
230:                int nstrings = pool.size();
231:                //System.out.println("makeStringPool: nstrings = "+nstrings);
232:                if (nstrings > (1 << 16 - 1)) {
233:                    throw new RuntimeException(
234:                            "more than 64k strings in constant pool");
235:                }
236:                String[] sortArray = new String[nstrings];
237:                Enumeration keys = pool.keys();
238:                int poolsize = 0;
239:                // Sort strings by numerical index
240:                while (keys.hasMoreElements()) {
241:                    String key = (String) keys.nextElement();
242:                    int v = pool.get(key);
243:                    //System.out.println("sorting: key="+key+", index="+v);
244:                    sortArray[v] = key;
245:                    poolsize += (getByteLength(key, dc.encoding) + 1); // account for zero terminator
246:                }
247:
248:                byte pooldata[] = new byte[poolsize];
249:                int pos = 0;
250:                for (int i = 0; i < nstrings; i++) {
251:                    String s = sortArray[i];
252:                    //System.out.println("s="+s);
253:                    // Convert to byte values in the desired charset encoding
254:                    byte chars[];
255:                    try {
256:                        chars = s.getBytes(dc.encoding);
257:                    } catch (UnsupportedEncodingException e) {
258:                        chars = s.getBytes();
259:                    }
260:                    int len = chars.length;
261:                    //arraycopy(Object src, int srcPos, Object dest, int destPos, int length) 
262:                    System.arraycopy(chars, 0, pooldata, pos, len);
263:                    pos += len;
264:                    pooldata[pos++] = 0; // null terminate the string
265:                }
266:                return pooldata;
267:            }
268:
269:            /**
270:             * Intern a string in the constant pool.
271:             * @param s the string
272:             * @param dc
273:             * @return offset into string pool
274:             */
275:            static public final int addStringConstant(String s, DataContext dc) {
276:                int size = dc.cpool.size();
277:                dc.cpool.put(s, size);
278:                dc.pool_data_length += (getByteLength(s, dc.encoding) + 1);
279:                return size;
280:            }
281:
282:            /**
283:             * @return the index of the string in the constant pool.
284:             */
285:            static public final int getStringIndex(String s, DataContext dc) {
286:                return dc.cpool.get(s);
287:            }
288:
289:            /**
290:             * Intern a string in the constant pool, but only if it has been seen once before.
291:             * @param s the string
292:             * @param dc
293:             * @return the offset into string pool, or -1 if we decided not to intern it yet
294:             */
295:            static public final int maybeInternString(String s, DataContext dc) {
296:                int idx = dc.cpool.get(s);
297:                if (idx >= 0) {
298:                    return idx;
299:                }
300:                if (dc.pool_data_length >= 65532) {
301:                    return -1;
302:                }
303:                boolean seen = dc.cpool_first.containsKey(s);
304:                if (seen) {
305:                    int size = dc.cpool.size();
306:                    // We can only have 64k of data (including zero terminators on strings)
307:                    dc.pool_data_length += (getByteLength(s, dc.encoding) + 1);
308:                    // 65536 - 4 bytes for # strings
309:                    if (dc.pool_data_length >= 65532) {
310:                        return -1;
311:                    }
312:                    dc.cpool.put(s, size);
313:                    return size;
314:                } else {
315:                    dc.cpool_first.put(s, 1);
316:                    return (-1);
317:                }
318:            }
319:
320:            /**
321:             * Intern a string in the constant pool
322:             * @param s the string
323:             * @param dc
324:             * @return the offset into string pool, or -1 if the string pool is full
325:             */
326:            static public final int internString(String s, DataContext dc) {
327:                int idx = dc.cpool.get(s);
328:                if (idx >= 0) {
329:                    return idx;
330:                }
331:                if (dc.pool_data_length >= 65532) {
332:                    return -1;
333:                }
334:                int size = dc.cpool.size();
335:                // We can only have 64k of data (including zero terminators on strings)
336:                dc.pool_data_length += (getByteLength(s, dc.encoding) + 1);
337:                // 65536 - 4 bytes for # strings
338:                if (dc.pool_data_length >= 65532) {
339:                    return -1;
340:                }
341:                dc.cpool.put(s, size);
342:                return size;
343:            }
344:
345:            /**
346:             * Writes a string offset from the constant pool to a flash buffer
347:             *
348:             * @param o  dictionary string index to write to flash buffer
349:             */
350:            static public final void writeOffset(int o, FlashBuffer fb) {
351:                if (o > 255) {
352:                    fb.writeByte(9);
353:                    fb.writeWord(o);
354:                } else {
355:                    fb.writeByte(8);
356:                    fb.writeByte(o);
357:                }
358:            }
359:
360:            /**
361:             * Writes a string offset from the constant pool to a flash buffer. This uses _writeXXX
362:             * which bypasses the FlashBuffer ensureCapacity() check (for speed) so you must make sure
363:             * the FlashBuffer is large enough to write these bytes.
364:             *
365:             * @param o  dictionary string index to write to flash buffer
366:             */
367:            static public final void _writeOffset(int o, FlashBuffer fb) {
368:                if (o > 255) {
369:                    fb._writeByte(9);
370:                    fb._writeWord(o);
371:                } else {
372:                    fb._writeByte(8);
373:                    fb._writeByte(o);
374:                }
375:            }
376:
377:            /**
378:             * For debugging, to print out a Program as hex values.
379:             */
380:
381:            static public void printProgram(Program program) {
382:                //program.printContent(System.out, " ");
383:                FlashBuffer body = program.body();
384:                byte[] buf = body.getBuf();
385:                System.out.print("char data[] = {\n   ");
386:                for (int i = 0; i < body.getSize(); i++) {
387:                    if (i % 10 == 0) {
388:                        System.out.print("\n    ");
389:                    }
390:                    if (i < buf.length - 1) {
391:                        System.out.print("(byte) 0x"
392:                                + Integer.toHexString((buf[i] >> 4) & 0xf)
393:                                + Integer.toHexString(buf[i] & 0xf) + ", ");
394:                    } else {
395:                        System.out.print("(byte) 0x"
396:                                + Integer.toHexString((buf[i] >> 4) & 0xf)
397:                                + Integer.toHexString(buf[i] & 0xf));
398:                    }
399:                }
400:                System.out.println("\n};");
401:            }
402:        }
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