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Java Source Code / Java Documentation » 6.0 JDK Modules » jaxb xjc » com.sun.xml.xsom.impl.parser.state 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // AttributesImpl.java - default implementation of Attributes.
002:        // Written by David Megginson, sax@megginson.com
003:        // NO WARRANTY!  This class is in the public domain.
004:
005:        // $Id: AttributesImpl.java,v 1.4 2002/09/29 02:55:48 okajima Exp $
006:
007:        //fixed bug at removeAttribute!! by Daisuke OKAJIMA 2002.4.21
008:
009:        package com.sun.xml.xsom.impl.parser.state;
010:
011:        import org.xml.sax.Attributes;
012:
013:        /**
014:         * Default implementation of the Attributes interface.
015:         *
016:         * <blockquote>
017:         * <em>This module, both source code and documentation, is in the
018:         * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
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:         *         <a href="mailto:sax@megginson.com">sax@megginson.com</a>
044:         * @version 2.0
045:         */
046:        public class AttributesImpl implements  Attributes {
047:
048:            ////////////////////////////////////////////////////////////////////
049:            // Constructors.
050:            ////////////////////////////////////////////////////////////////////
051:
052:            /**
053:             * Construct a new, empty AttributesImpl object.
054:             */
055:            public AttributesImpl() {
056:                length = 0;
057:                data = null;
058:            }
059:
060:            /**
061:             * Copy an existing Attributes object.
062:             *
063:             * <p>This constructor is especially useful inside a
064:             * {@link org.xml.sax.ContentHandler#startElement startElement} event.</p>
065:             *
066:             * @param atts The existing Attributes object.
067:             */
068:            public AttributesImpl(Attributes atts) {
069:                setAttributes(atts);
070:            }
071:
072:            ////////////////////////////////////////////////////////////////////
073:            // Implementation of org.xml.sax.Attributes.
074:            ////////////////////////////////////////////////////////////////////
075:
076:            /**
077:             * Return the number of attributes in the list.
078:             *
079:             * @return The number of attributes in the list.
080:             * @see org.xml.sax.Attributes#getLength
081:             */
082:            public int getLength() {
083:                return length;
084:            }
085:
086:            /**
087:             * Return an attribute's Namespace URI.
088:             *
089:             * @param index The attribute's index (zero-based).
090:             * @return The Namespace URI, the empty string if none is
091:             *         available, or null if the index is out of range.
092:             * @see org.xml.sax.Attributes#getURI
093:             */
094:            public String getURI(int index) {
095:                if (index >= 0 && index < length) {
096:                    return data[index * 5];
097:                } else {
098:                    return null;
099:                }
100:            }
101:
102:            /**
103:             * Return an attribute's local name.
104:             *
105:             * @param index The attribute's index (zero-based).
106:             * @return The attribute's local name, the empty string if 
107:             *         none is available, or null if the index if out of range.
108:             * @see org.xml.sax.Attributes#getLocalName
109:             */
110:            public String getLocalName(int index) {
111:                if (index >= 0 && index < length) {
112:                    return data[index * 5 + 1];
113:                } else {
114:                    return null;
115:                }
116:            }
117:
118:            /**
119:             * Return an attribute's qualified (prefixed) name.
120:             *
121:             * @param index The attribute's index (zero-based).
122:             * @return The attribute's qualified name, the empty string if 
123:             *         none is available, or null if the index is out of bounds.
124:             * @see org.xml.sax.Attributes#getQName
125:             */
126:            public String getQName(int index) {
127:                if (index >= 0 && index < length) {
128:                    return data[index * 5 + 2];
129:                } else {
130:                    return null;
131:                }
132:            }
133:
134:            /**
135:             * Return an attribute's type by index.
136:             *
137:             * @param index The attribute's index (zero-based).
138:             * @return The attribute's type, "CDATA" if the type is unknown, or null
139:             *         if the index is out of bounds.
140:             * @see org.xml.sax.Attributes#getType(int)
141:             */
142:            public String getType(int index) {
143:                if (index >= 0 && index < length) {
144:                    return data[index * 5 + 3];
145:                } else {
146:                    return null;
147:                }
148:            }
149:
150:            /**
151:             * Return an attribute's value by index.
152:             *
153:             * @param index The attribute's index (zero-based).
154:             * @return The attribute's value or null if the index is out of bounds.
155:             * @see org.xml.sax.Attributes#getValue(int)
156:             */
157:            public String getValue(int index) {
158:                if (index >= 0 && index < length) {
159:                    return data[index * 5 + 4];
160:                } else {
161:                    return null;
162:                }
163:            }
164:
165:            /**
166:             * Look up an attribute's index by Namespace name.
167:             *
168:             * <p>In many cases, it will be more efficient to look up the name once and
169:             * use the index query methods rather than using the name query methods
170:             * repeatedly.</p>
171:             *
172:             * @param uri The attribute's Namespace URI, or the empty
173:             *        string if none is available.
174:             * @param localName The attribute's local name.
175:             * @return The attribute's index, or -1 if none matches.
176:             * @see org.xml.sax.Attributes#getIndex(java.lang.String,java.lang.String)
177:             */
178:            public int getIndex(String uri, String localName) {
179:                int max = length * 5;
180:                for (int i = 0; i < max; i += 5) {
181:                    if (data[i].equals(uri) && data[i + 1].equals(localName)) {
182:                        return i / 5;
183:                    }
184:                }
185:                return -1;
186:            }
187:
188:            /**
189:             * Look up an attribute's index by qualified (prefixed) name.
190:             *
191:             * @param qName The qualified name.
192:             * @return The attribute's index, or -1 if none matches.
193:             * @see org.xml.sax.Attributes#getIndex(java.lang.String)
194:             */
195:            public int getIndex(String qName) {
196:                int max = length * 5;
197:                for (int i = 0; i < max; i += 5) {
198:                    if (data[i + 2].equals(qName)) {
199:                        return i / 5;
200:                    }
201:                }
202:                return -1;
203:            }
204:
205:            /**
206:             * Look up an attribute's type by Namespace-qualified name.
207:             *
208:             * @param uri The Namespace URI, or the empty string for a name
209:             *        with no explicit Namespace URI.
210:             * @param localName The local name.
211:             * @return The attribute's type, or null if there is no
212:             *         matching attribute.
213:             * @see org.xml.sax.Attributes#getType(java.lang.String,java.lang.String)
214:             */
215:            public String getType(String uri, String localName) {
216:                int max = length * 5;
217:                for (int i = 0; i < max; i += 5) {
218:                    if (data[i].equals(uri) && data[i + 1].equals(localName)) {
219:                        return data[i + 3];
220:                    }
221:                }
222:                return null;
223:            }
224:
225:            /**
226:             * Look up an attribute's type by qualified (prefixed) name.
227:             *
228:             * @param qName The qualified name.
229:             * @return The attribute's type, or null if there is no
230:             *         matching attribute.
231:             * @see org.xml.sax.Attributes#getType(java.lang.String)
232:             */
233:            public String getType(String qName) {
234:                int max = length * 5;
235:                for (int i = 0; i < max; i += 5) {
236:                    if (data[i + 2].equals(qName)) {
237:                        return data[i + 3];
238:                    }
239:                }
240:                return null;
241:            }
242:
243:            /**
244:             * Look up an attribute's value by Namespace-qualified name.
245:             *
246:             * @param uri The Namespace URI, or the empty string for a name
247:             *        with no explicit Namespace URI.
248:             * @param localName The local name.
249:             * @return The attribute's value, or null if there is no
250:             *         matching attribute.
251:             * @see org.xml.sax.Attributes#getValue(java.lang.String,java.lang.String)
252:             */
253:            public String getValue(String uri, String localName) {
254:                int max = length * 5;
255:                for (int i = 0; i < max; i += 5) {
256:                    if (data[i].equals(uri) && data[i + 1].equals(localName)) {
257:                        return data[i + 4];
258:                    }
259:                }
260:                return null;
261:            }
262:
263:            /**
264:             * Look up an attribute's value by qualified (prefixed) name.
265:             *
266:             * @param qName The qualified name.
267:             * @return The attribute's value, or null if there is no
268:             *         matching attribute.
269:             * @see org.xml.sax.Attributes#getValue(java.lang.String)
270:             */
271:            public String getValue(String qName) {
272:                int max = length * 5;
273:                for (int i = 0; i < max; i += 5) {
274:                    if (data[i + 2].equals(qName)) {
275:                        return data[i + 4];
276:                    }
277:                }
278:                return null;
279:            }
280:
281:            ////////////////////////////////////////////////////////////////////
282:            // Manipulators.
283:            ////////////////////////////////////////////////////////////////////
284:
285:            /**
286:             * Clear the attribute list for reuse.
287:             *
288:             * <p>Note that no memory is actually freed by this call:
289:             * the current arrays are kept so that they can be 
290:             * reused.</p>
291:             */
292:            public void clear() {
293:                length = 0;
294:            }
295:
296:            /**
297:             * Copy an entire Attributes object.
298:             *
299:             * <p>It may be more efficient to reuse an existing object
300:             * rather than constantly allocating new ones.</p>
301:             * 
302:             * @param atts The attributes to copy.
303:             */
304:            public void setAttributes(Attributes atts) {
305:                clear();
306:                length = atts.getLength();
307:                data = new String[length * 5];
308:                for (int i = 0; i < length; i++) {
309:                    data[i * 5] = atts.getURI(i);
310:                    data[i * 5 + 1] = atts.getLocalName(i);
311:                    data[i * 5 + 2] = atts.getQName(i);
312:                    data[i * 5 + 3] = atts.getType(i);
313:                    data[i * 5 + 4] = atts.getValue(i);
314:                }
315:            }
316:
317:            /**
318:             * Add an attribute to the end of the list.
319:             *
320:             * <p>For the sake of speed, this method does no checking
321:             * to see if the attribute is already in the list: that is
322:             * the responsibility of the application.</p>
323:             *
324:             * @param uri The Namespace URI, or the empty string if
325:             *        none is available or Namespace processing is not
326:             *        being performed.
327:             * @param localName The local name, or the empty string if
328:             *        Namespace processing is not being performed.
329:             * @param qName The qualified (prefixed) name, or the empty string
330:             *        if qualified names are not available.
331:             * @param type The attribute type as a string.
332:             * @param value The attribute value.
333:             */
334:            public void addAttribute(String uri, String localName,
335:                    String qName, String type, String value) {
336:                ensureCapacity(length + 1);
337:                data[length * 5] = uri;
338:                data[length * 5 + 1] = localName;
339:                data[length * 5 + 2] = qName;
340:                data[length * 5 + 3] = type;
341:                data[length * 5 + 4] = value;
342:                length++;
343:            }
344:
345:            /**
346:             * Set an attribute in the list.
347:             *
348:             * <p>For the sake of speed, this method does no checking
349:             * for name conflicts or well-formedness: such checks are the
350:             * responsibility of the application.</p>
351:             *
352:             * @param index The index of the attribute (zero-based).
353:             * @param uri The Namespace URI, or the empty string if
354:             *        none is available or Namespace processing is not
355:             *        being performed.
356:             * @param localName The local name, or the empty string if
357:             *        Namespace processing is not being performed.
358:             * @param qName The qualified name, or the empty string
359:             *        if qualified names are not available.
360:             * @param type The attribute type as a string.
361:             * @param value The attribute value.
362:             * @exception java.lang.ArrayIndexOutOfBoundsException When the
363:             *            supplied index does not point to an attribute
364:             *            in the list.
365:             */
366:            public void setAttribute(int index, String uri, String localName,
367:                    String qName, String type, String value) {
368:                if (index >= 0 && index < length) {
369:                    data[index * 5] = uri;
370:                    data[index * 5 + 1] = localName;
371:                    data[index * 5 + 2] = qName;
372:                    data[index * 5 + 3] = type;
373:                    data[index * 5 + 4] = value;
374:                } else {
375:                    badIndex(index);
376:                }
377:            }
378:
379:            /**
380:             * Remove an attribute from the list.
381:             *
382:             * @param index The index of the attribute (zero-based).
383:             * @exception java.lang.ArrayIndexOutOfBoundsException When the
384:             *            supplied index does not point to an attribute
385:             *            in the list.
386:             */
387:            public void removeAttribute(int index) {
388:                if (index >= 0 && index < length) {
389:                    if (index < length - 1) {
390:                        System.arraycopy(data, (index + 1) * 5, data,
391:                                index * 5, (length - index - 1) * 5);
392:                    }
393:                    length--;
394:                } else {
395:                    badIndex(index);
396:                }
397:            }
398:
399:            /**
400:             * Set the Namespace URI of a specific attribute.
401:             *
402:             * @param index The index of the attribute (zero-based).
403:             * @param uri The attribute's Namespace URI, or the empty
404:             *        string for none.
405:             * @exception java.lang.ArrayIndexOutOfBoundsException When the
406:             *            supplied index does not point to an attribute
407:             *            in the list.
408:             */
409:            public void setURI(int index, String uri) {
410:                if (index >= 0 && index < length) {
411:                    data[index * 5] = uri;
412:                } else {
413:                    badIndex(index);
414:                }
415:            }
416:
417:            /**
418:             * Set the local name of a specific attribute.
419:             *
420:             * @param index The index of the attribute (zero-based).
421:             * @param localName The attribute's local name, or the empty
422:             *        string for none.
423:             * @exception java.lang.ArrayIndexOutOfBoundsException When the
424:             *            supplied index does not point to an attribute
425:             *            in the list.
426:             */
427:            public void setLocalName(int index, String localName) {
428:                if (index >= 0 && index < length) {
429:                    data[index * 5 + 1] = localName;
430:                } else {
431:                    badIndex(index);
432:                }
433:            }
434:
435:            /**
436:             * Set the qualified name of a specific attribute.
437:             *
438:             * @param index The index of the attribute (zero-based).
439:             * @param qName The attribute's qualified name, or the empty
440:             *        string for none.
441:             * @exception java.lang.ArrayIndexOutOfBoundsException When the
442:             *            supplied index does not point to an attribute
443:             *            in the list.
444:             */
445:            public void setQName(int index, String qName) {
446:                if (index >= 0 && index < length) {
447:                    data[index * 5 + 2] = qName;
448:                } else {
449:                    badIndex(index);
450:                }
451:            }
452:
453:            /**
454:             * Set the type of a specific attribute.
455:             *
456:             * @param index The index of the attribute (zero-based).
457:             * @param type The attribute's type.
458:             * @exception java.lang.ArrayIndexOutOfBoundsException When the
459:             *            supplied index does not point to an attribute
460:             *            in the list.
461:             */
462:            public void setType(int index, String type) {
463:                if (index >= 0 && index < length) {
464:                    data[index * 5 + 3] = type;
465:                } else {
466:                    badIndex(index);
467:                }
468:            }
469:
470:            /**
471:             * Set the value of a specific attribute.
472:             *
473:             * @param index The index of the attribute (zero-based).
474:             * @param value The attribute's value.
475:             * @exception java.lang.ArrayIndexOutOfBoundsException When the
476:             *            supplied index does not point to an attribute
477:             *            in the list.
478:             */
479:            public void setValue(int index, String value) {
480:                if (index >= 0 && index < length) {
481:                    data[index * 5 + 4] = value;
482:                } else {
483:                    badIndex(index);
484:                }
485:            }
486:
487:            ////////////////////////////////////////////////////////////////////
488:            // Internal methods.
489:            ////////////////////////////////////////////////////////////////////
490:
491:            /**
492:             * Ensure the internal array's capacity.
493:             *
494:             * @param n The minimum number of attributes that the array must
495:             *        be able to hold.
496:             */
497:            private void ensureCapacity(int n) {
498:                if (n > 0 && (data == null || data.length == 0)) {
499:                    data = new String[25];
500:                }
501:
502:                int max = data.length;
503:                if (max >= n * 5) {
504:                    return;
505:                }
506:
507:                while (max < n * 5) {
508:                    max *= 2;
509:                }
510:                String newData[] = new String[max];
511:                System.arraycopy(data, 0, newData, 0, length * 5);
512:                data = newData;
513:            }
514:
515:            /**
516:             * Report a bad array index in a manipulator.
517:             *
518:             * @param index The index to report.
519:             * @exception java.lang.ArrayIndexOutOfBoundsException Always.
520:             */
521:            private void badIndex(int index)
522:                    throws ArrayIndexOutOfBoundsException {
523:                String msg = "Attempt to modify attribute at illegal index: "
524:                        + index;
525:                throw new ArrayIndexOutOfBoundsException(msg);
526:            }
527:
528:            ////////////////////////////////////////////////////////////////////
529:            // Internal state.
530:            ////////////////////////////////////////////////////////////////////
531:
532:            int length;
533:            String data[];
534:
535:        }
536:
537:        // end of AttributesImpl.java
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