Source Code Cross Referenced for AttributesImpl.java in  » Web-Server » Rimfaxe-Web-Server » org » xml » sax » helpers » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Server » Rimfaxe Web Server » org.xml.sax.helpers 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // AttributesImpl.java - default implementation of Attributes.
002:        // http://www.saxproject.org
003:        // Written by David Megginson
004:        // NO WARRANTY!  This class is in the public domain.
005:        // $Id: AttributesImpl.java,v 1.7 2002/02/01 20:06:20 db Exp $
006:
007:        package org.xml.sax.helpers;
008:
009:        import org.xml.sax.Attributes;
010:
011:        /**
012:         * Default implementation of the Attributes interface.
013:         *
014:         * <blockquote>
015:         * <em>This module, both source code and documentation, is in the
016:         * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
017:         * See <a href='http://www.saxproject.org'>http://www.saxproject.org</a>
018:         * for further information.
019:         * </blockquote>
020:         *
021:         * <p>This class provides a default implementation of the SAX2
022:         * {@link org.xml.sax.Attributes Attributes} interface, with the 
023:         * addition of manipulators so that the list can be modified or 
024:         * reused.</p>
025:         *
026:         * <p>There are two typical uses of this class:</p>
027:         *
028:         * <ol>
029:         * <li>to take a persistent snapshot of an Attributes object
030:         *  in a {@link org.xml.sax.ContentHandler#startElement startElement} event; or</li>
031:         * <li>to construct or modify an Attributes object in a SAX2 driver or filter.</li>
032:         * </ol>
033:         *
034:         * <p>This class replaces the now-deprecated SAX1 {@link 
035:         * org.xml.sax.helpers.AttributeListImpl AttributeListImpl}
036:         * class; in addition to supporting the updated Attributes
037:         * interface rather than the deprecated {@link org.xml.sax.AttributeList
038:         * AttributeList} interface, it also includes a much more efficient 
039:         * implementation using a single array rather than a set of Vectors.</p>
040:         *
041:         * @since SAX 2.0
042:         * @author David Megginson
043:         * @version 2.0.1 (sax2r2)
044:         */
045:        public class AttributesImpl implements  Attributes {
046:
047:            ////////////////////////////////////////////////////////////////////
048:            // Constructors.
049:            ////////////////////////////////////////////////////////////////////
050:
051:            /**
052:             * Construct a new, empty AttributesImpl object.
053:             */
054:            public AttributesImpl() {
055:                length = 0;
056:                data = null;
057:            }
058:
059:            /**
060:             * Copy an existing Attributes object.
061:             *
062:             * <p>This constructor is especially useful inside a
063:             * {@link org.xml.sax.ContentHandler#startElement startElement} event.</p>
064:             *
065:             * @param atts The existing Attributes object.
066:             */
067:            public AttributesImpl(Attributes atts) {
068:                setAttributes(atts);
069:            }
070:
071:            ////////////////////////////////////////////////////////////////////
072:            // Implementation of org.xml.sax.Attributes.
073:            ////////////////////////////////////////////////////////////////////
074:
075:            /**
076:             * Return the number of attributes in the list.
077:             *
078:             * @return The number of attributes in the list.
079:             * @see org.xml.sax.Attributes#getLength
080:             */
081:            public int getLength() {
082:                return length;
083:            }
084:
085:            /**
086:             * Return an attribute's Namespace URI.
087:             *
088:             * @param index The attribute's index (zero-based).
089:             * @return The Namespace URI, the empty string if none is
090:             *         available, or null if the index is out of range.
091:             * @see org.xml.sax.Attributes#getURI
092:             */
093:            public String getURI(int index) {
094:                if (index >= 0 && index < length) {
095:                    return data[index * 5];
096:                } else {
097:                    return null;
098:                }
099:            }
100:
101:            /**
102:             * Return an attribute's local name.
103:             *
104:             * @param index The attribute's index (zero-based).
105:             * @return The attribute's local name, the empty string if 
106:             *         none is available, or null if the index if out of range.
107:             * @see org.xml.sax.Attributes#getLocalName
108:             */
109:            public String getLocalName(int index) {
110:                if (index >= 0 && index < length) {
111:                    return data[index * 5 + 1];
112:                } else {
113:                    return null;
114:                }
115:            }
116:
117:            /**
118:             * Return an attribute's qualified (prefixed) name.
119:             *
120:             * @param index The attribute's index (zero-based).
121:             * @return The attribute's qualified name, the empty string if 
122:             *         none is available, or null if the index is out of bounds.
123:             * @see org.xml.sax.Attributes#getQName
124:             */
125:            public String getQName(int index) {
126:                if (index >= 0 && index < length) {
127:                    return data[index * 5 + 2];
128:                } else {
129:                    return null;
130:                }
131:            }
132:
133:            /**
134:             * Return an attribute's type by index.
135:             *
136:             * @param index The attribute's index (zero-based).
137:             * @return The attribute's type, "CDATA" if the type is unknown, or null
138:             *         if the index is out of bounds.
139:             * @see org.xml.sax.Attributes#getType(int)
140:             */
141:            public String getType(int index) {
142:                if (index >= 0 && index < length) {
143:                    return data[index * 5 + 3];
144:                } else {
145:                    return null;
146:                }
147:            }
148:
149:            /**
150:             * Return an attribute's value by index.
151:             *
152:             * @param index The attribute's index (zero-based).
153:             * @return The attribute's value or null if the index is out of bounds.
154:             * @see org.xml.sax.Attributes#getValue(int)
155:             */
156:            public String getValue(int index) {
157:                if (index >= 0 && index < length) {
158:                    return data[index * 5 + 4];
159:                } else {
160:                    return null;
161:                }
162:            }
163:
164:            /**
165:             * Look up an attribute's index by Namespace name.
166:             *
167:             * <p>In many cases, it will be more efficient to look up the name once and
168:             * use the index query methods rather than using the name query methods
169:             * repeatedly.</p>
170:             *
171:             * @param uri The attribute's Namespace URI, or the empty
172:             *        string if none is available.
173:             * @param localName The attribute's local name.
174:             * @return The attribute's index, or -1 if none matches.
175:             * @see org.xml.sax.Attributes#getIndex(java.lang.String,java.lang.String)
176:             */
177:            public int getIndex(String uri, String localName) {
178:                int max = length * 5;
179:                for (int i = 0; i < max; i += 5) {
180:                    if (data[i].equals(uri) && data[i + 1].equals(localName)) {
181:                        return i / 5;
182:                    }
183:                }
184:                return -1;
185:            }
186:
187:            /**
188:             * Look up an attribute's index by qualified (prefixed) name.
189:             *
190:             * @param qName The qualified name.
191:             * @return The attribute's index, or -1 if none matches.
192:             * @see org.xml.sax.Attributes#getIndex(java.lang.String)
193:             */
194:            public int getIndex(String qName) {
195:                int max = length * 5;
196:                for (int i = 0; i < max; i += 5) {
197:                    if (data[i + 2].equals(qName)) {
198:                        return i / 5;
199:                    }
200:                }
201:                return -1;
202:            }
203:
204:            /**
205:             * Look up an attribute's type by Namespace-qualified name.
206:             *
207:             * @param uri The Namespace URI, or the empty string for a name
208:             *        with no explicit Namespace URI.
209:             * @param localName The local name.
210:             * @return The attribute's type, or null if there is no
211:             *         matching attribute.
212:             * @see org.xml.sax.Attributes#getType(java.lang.String,java.lang.String)
213:             */
214:            public String getType(String uri, String localName) {
215:                int max = length * 5;
216:                for (int i = 0; i < max; i += 5) {
217:                    if (data[i].equals(uri) && data[i + 1].equals(localName)) {
218:                        return data[i + 3];
219:                    }
220:                }
221:                return null;
222:            }
223:
224:            /**
225:             * Look up an attribute's type by qualified (prefixed) name.
226:             *
227:             * @param qName The qualified name.
228:             * @return The attribute's type, or null if there is no
229:             *         matching attribute.
230:             * @see org.xml.sax.Attributes#getType(java.lang.String)
231:             */
232:            public String getType(String qName) {
233:                int max = length * 5;
234:                for (int i = 0; i < max; i += 5) {
235:                    if (data[i + 2].equals(qName)) {
236:                        return data[i + 3];
237:                    }
238:                }
239:                return null;
240:            }
241:
242:            /**
243:             * Look up an attribute's value by Namespace-qualified name.
244:             *
245:             * @param uri The Namespace URI, or the empty string for a name
246:             *        with no explicit Namespace URI.
247:             * @param localName The local name.
248:             * @return The attribute's value, or null if there is no
249:             *         matching attribute.
250:             * @see org.xml.sax.Attributes#getValue(java.lang.String,java.lang.String)
251:             */
252:            public String getValue(String uri, String localName) {
253:                int max = length * 5;
254:                for (int i = 0; i < max; i += 5) {
255:                    if (data[i].equals(uri) && data[i + 1].equals(localName)) {
256:                        return data[i + 4];
257:                    }
258:                }
259:                return null;
260:            }
261:
262:            /**
263:             * Look up an attribute's value by qualified (prefixed) name.
264:             *
265:             * @param qName The qualified name.
266:             * @return The attribute's value, or null if there is no
267:             *         matching attribute.
268:             * @see org.xml.sax.Attributes#getValue(java.lang.String)
269:             */
270:            public String getValue(String qName) {
271:                int max = length * 5;
272:                for (int i = 0; i < max; i += 5) {
273:                    if (data[i + 2].equals(qName)) {
274:                        return data[i + 4];
275:                    }
276:                }
277:                return null;
278:            }
279:
280:            ////////////////////////////////////////////////////////////////////
281:            // Manipulators.
282:            ////////////////////////////////////////////////////////////////////
283:
284:            /**
285:             * Clear the attribute list for reuse.
286:             *
287:             * <p>Note that little memory is freed by this call:
288:             * the current array is kept so it can be 
289:             * reused.</p>
290:             */
291:            public void clear() {
292:                if (data != null) {
293:                    for (int i = 0; i < (length * 5); i++)
294:                        data[i] = null;
295:                }
296:                length = 0;
297:            }
298:
299:            /**
300:             * Copy an entire Attributes object.
301:             *
302:             * <p>It may be more efficient to reuse an existing object
303:             * rather than constantly allocating new ones.</p>
304:             * 
305:             * @param atts The attributes to copy.
306:             */
307:            public void setAttributes(Attributes atts) {
308:                clear();
309:                length = atts.getLength();
310:                if (length > 0) {
311:                    data = new String[length * 5];
312:                    for (int i = 0; i < length; i++) {
313:                        data[i * 5] = atts.getURI(i);
314:                        data[i * 5 + 1] = atts.getLocalName(i);
315:                        data[i * 5 + 2] = atts.getQName(i);
316:                        data[i * 5 + 3] = atts.getType(i);
317:                        data[i * 5 + 4] = atts.getValue(i);
318:                    }
319:                }
320:            }
321:
322:            /**
323:             * Add an attribute to the end of the list.
324:             *
325:             * <p>For the sake of speed, this method does no checking
326:             * to see if the attribute is already in the list: that is
327:             * the responsibility of the application.</p>
328:             *
329:             * @param uri The Namespace URI, or the empty string if
330:             *        none is available or Namespace processing is not
331:             *        being performed.
332:             * @param localName The local name, or the empty string if
333:             *        Namespace processing is not being performed.
334:             * @param qName The qualified (prefixed) name, or the empty string
335:             *        if qualified names are not available.
336:             * @param type The attribute type as a string.
337:             * @param value The attribute value.
338:             */
339:            public void addAttribute(String uri, String localName,
340:                    String qName, String type, String value) {
341:                ensureCapacity(length + 1);
342:                data[length * 5] = uri;
343:                data[length * 5 + 1] = localName;
344:                data[length * 5 + 2] = qName;
345:                data[length * 5 + 3] = type;
346:                data[length * 5 + 4] = value;
347:                length++;
348:            }
349:
350:            /**
351:             * Set an attribute in the list.
352:             *
353:             * <p>For the sake of speed, this method does no checking
354:             * for name conflicts or well-formedness: such checks are the
355:             * responsibility of the application.</p>
356:             *
357:             * @param index The index of the attribute (zero-based).
358:             * @param uri The Namespace URI, or the empty string if
359:             *        none is available or Namespace processing is not
360:             *        being performed.
361:             * @param localName The local name, or the empty string if
362:             *        Namespace processing is not being performed.
363:             * @param qName The qualified name, or the empty string
364:             *        if qualified names are not available.
365:             * @param type The attribute type as a string.
366:             * @param value The attribute value.
367:             * @exception java.lang.ArrayIndexOutOfBoundsException When the
368:             *            supplied index does not point to an attribute
369:             *            in the list.
370:             */
371:            public void setAttribute(int index, String uri, String localName,
372:                    String qName, String type, String value) {
373:                if (index >= 0 && index < length) {
374:                    data[index * 5] = uri;
375:                    data[index * 5 + 1] = localName;
376:                    data[index * 5 + 2] = qName;
377:                    data[index * 5 + 3] = type;
378:                    data[index * 5 + 4] = value;
379:                } else {
380:                    badIndex(index);
381:                }
382:            }
383:
384:            /**
385:             * Remove an attribute from the list.
386:             *
387:             * @param index The index of the attribute (zero-based).
388:             * @exception java.lang.ArrayIndexOutOfBoundsException When the
389:             *            supplied index does not point to an attribute
390:             *            in the list.
391:             */
392:            public void removeAttribute(int index) {
393:                if (index >= 0 && index < length) {
394:                    if (index < length - 1) {
395:                        System.arraycopy(data, (index + 1) * 5, data,
396:                                index * 5, (length - index - 1) * 5);
397:                    }
398:                    index = (length - 1) * 5;
399:                    data[index++] = null;
400:                    data[index++] = null;
401:                    data[index++] = null;
402:                    data[index++] = null;
403:                    data[index] = null;
404:                    length--;
405:                } else {
406:                    badIndex(index);
407:                }
408:            }
409:
410:            /**
411:             * Set the Namespace URI of a specific attribute.
412:             *
413:             * @param index The index of the attribute (zero-based).
414:             * @param uri The attribute's Namespace URI, or the empty
415:             *        string for none.
416:             * @exception java.lang.ArrayIndexOutOfBoundsException When the
417:             *            supplied index does not point to an attribute
418:             *            in the list.
419:             */
420:            public void setURI(int index, String uri) {
421:                if (index >= 0 && index < length) {
422:                    data[index * 5] = uri;
423:                } else {
424:                    badIndex(index);
425:                }
426:            }
427:
428:            /**
429:             * Set the local name of a specific attribute.
430:             *
431:             * @param index The index of the attribute (zero-based).
432:             * @param localName The attribute's local name, or the empty
433:             *        string for none.
434:             * @exception java.lang.ArrayIndexOutOfBoundsException When the
435:             *            supplied index does not point to an attribute
436:             *            in the list.
437:             */
438:            public void setLocalName(int index, String localName) {
439:                if (index >= 0 && index < length) {
440:                    data[index * 5 + 1] = localName;
441:                } else {
442:                    badIndex(index);
443:                }
444:            }
445:
446:            /**
447:             * Set the qualified name of a specific attribute.
448:             *
449:             * @param index The index of the attribute (zero-based).
450:             * @param qName The attribute's qualified name, or the empty
451:             *        string for none.
452:             * @exception java.lang.ArrayIndexOutOfBoundsException When the
453:             *            supplied index does not point to an attribute
454:             *            in the list.
455:             */
456:            public void setQName(int index, String qName) {
457:                if (index >= 0 && index < length) {
458:                    data[index * 5 + 2] = qName;
459:                } else {
460:                    badIndex(index);
461:                }
462:            }
463:
464:            /**
465:             * Set the type of a specific attribute.
466:             *
467:             * @param index The index of the attribute (zero-based).
468:             * @param type The attribute's type.
469:             * @exception java.lang.ArrayIndexOutOfBoundsException When the
470:             *            supplied index does not point to an attribute
471:             *            in the list.
472:             */
473:            public void setType(int index, String type) {
474:                if (index >= 0 && index < length) {
475:                    data[index * 5 + 3] = type;
476:                } else {
477:                    badIndex(index);
478:                }
479:            }
480:
481:            /**
482:             * Set the value of a specific attribute.
483:             *
484:             * @param index The index of the attribute (zero-based).
485:             * @param value The attribute's value.
486:             * @exception java.lang.ArrayIndexOutOfBoundsException When the
487:             *            supplied index does not point to an attribute
488:             *            in the list.
489:             */
490:            public void setValue(int index, String value) {
491:                if (index >= 0 && index < length) {
492:                    data[index * 5 + 4] = value;
493:                } else {
494:                    badIndex(index);
495:                }
496:            }
497:
498:            ////////////////////////////////////////////////////////////////////
499:            // Internal methods.
500:            ////////////////////////////////////////////////////////////////////
501:
502:            /**
503:             * Ensure the internal array's capacity.
504:             *
505:             * @param n The minimum number of attributes that the array must
506:             *        be able to hold.
507:             */
508:            private void ensureCapacity(int n) {
509:                if (n <= 0) {
510:                    return;
511:                }
512:                int max;
513:                if (data == null || data.length == 0) {
514:                    max = 25;
515:                } else if (data.length >= n * 5) {
516:                    return;
517:                } else {
518:                    max = data.length;
519:                }
520:                while (max < n * 5) {
521:                    max *= 2;
522:                }
523:
524:                String newData[] = new String[max];
525:                if (length > 0) {
526:                    System.arraycopy(data, 0, newData, 0, length * 5);
527:                }
528:                data = newData;
529:            }
530:
531:            /**
532:             * Report a bad array index in a manipulator.
533:             *
534:             * @param index The index to report.
535:             * @exception java.lang.ArrayIndexOutOfBoundsException Always.
536:             */
537:            private void badIndex(int index)
538:                    throws ArrayIndexOutOfBoundsException {
539:                String msg = "Attempt to modify attribute at illegal index: "
540:                        + index;
541:                throw new ArrayIndexOutOfBoundsException(msg);
542:            }
543:
544:            ////////////////////////////////////////////////////////////////////
545:            // Internal state.
546:            ////////////////////////////////////////////////////////////////////
547:
548:            int length;
549:            String data[];
550:
551:        }
552:
553:        // end of AttributesImpl.java
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