Source Code Cross Referenced for AttributeListImpl.java in  » Web-Server » Quadcap-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 » Quadcap Web Server » org.xml.sax.helpers 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Copyright 2000 - 2001 Quadcap Software.  All rights reserved.
002:         *
003:         * This software is distributed under the Quadcap Free Software License.
004:         * This software may be used or modified for any purpose, personal or
005:         * commercial.  Open Source redistributions are permitted.  Commercial
006:         * redistribution of larger works derived from, or works which bundle
007:         * this software requires a "Commercial Redistribution License"; see
008:         * http://www.quadcap.com/purchase.
009:         *
010:         * Redistributions qualify as "Open Source" under  one of the following terms:
011:         *   
012:         *    Redistributions are made at no charge beyond the reasonable cost of
013:         *    materials and delivery.
014:         *
015:         *    Redistributions are accompanied by a copy of the Source Code or by an
016:         *    irrevocable offer to provide a copy of the Source Code for up to three
017:         *    years at the cost of materials and delivery.  Such redistributions
018:         *    must allow further use, modification, and redistribution of the Source
019:         *    Code under substantially the same terms as this license.
020:         *
021:         * Redistributions of source code must retain the copyright notices as they
022:         * appear in each source code file, these license terms, and the
023:         * disclaimer/limitation of liability set forth as paragraph 6 below.
024:         *
025:         * Redistributions in binary form must reproduce this Copyright Notice,
026:         * these license terms, and the disclaimer/limitation of liability set
027:         * forth as paragraph 6 below, in the documentation and/or other materials
028:         * provided with the distribution.
029:         *
030:         * The Software is provided on an "AS IS" basis.  No warranty is
031:         * provided that the Software is free of defects, or fit for a
032:         * particular purpose.  
033:         *
034:         * Limitation of Liability. Quadcap Software shall not be liable
035:         * for any damages suffered by the Licensee or any third party resulting
036:         * from use of the Software.
037:         */
038:
039:        // SAX default implementation for AttributeList.
040:        // No warranty; no copyright -- use this as you will.
041:        // $Id: AttributeListImpl.java,v 1.3 2001/01/06 06:11:03 stan Exp $
042:        package org.xml.sax.helpers;
043:
044:        import org.xml.sax.AttributeList;
045:
046:        import java.util.Vector;
047:
048:        /**
049:         * Convenience implementation for AttributeList.
050:         *
051:         * <p>This class provides a convenience implementation of the SAX
052:         * AttributeList class.  This implementation is useful both
053:         * for SAX parser writers, who can use it to provide attributes
054:         * to the application, and for SAX application writers, who can
055:         * use it to create a persistent copy of an element's attribute
056:         * specifications:</p>
057:         *
058:         * <pre>
059:         * private AttributeList myatts;
060:         *
061:         * public void startElement (String name, AttributeList atts)
062:         * {
063:         *              // create a persistent copy of the attribute list
064:         *              // for use outside this method
065:         *   myatts = new AttributeListImpl(atts);
066:         *   [...]
067:         * }
068:         * </pre>
069:         *
070:         * <p>Please note that SAX parsers are not required to use this
071:         * class to provide an implementation of AttributeList; it is
072:         * supplied only as an optional convenience.  In particular, 
073:         * parser writers are encouraged to invent more efficient
074:         * implementations.</p>
075:         *
076:         * @author David Megginson (ak117@freenet.carleton.ca)
077:         * @version 1.0
078:         * @see org.xml.sax.AttributeList
079:         * @see org.xml.sax.DocumentHandler#startElement
080:         */
081:        public class AttributeListImpl implements  AttributeList {
082:
083:            /**
084:             * Create an empty attribute list.
085:             *
086:             * <p>This constructor is most useful for parser writers, who
087:             * will use it to create a single, reusable attribute list that
088:             * can be reset with the clear method between elements.</p>
089:             *
090:             * @see #addAttribute
091:             * @see #clear
092:             */
093:            public AttributeListImpl() {
094:            }
095:
096:            /**
097:             * Construct a persistent copy of an existing attribute list.
098:             *
099:             * <p>This constructor is most useful for application writers,
100:             * who will use it to create a persistent copy of an existing
101:             * attribute list.</p>
102:             *
103:             * @param atts The attribute list to copy
104:             * @see org.xml.sax.DocumentHandler#startElement
105:             */
106:            public AttributeListImpl(AttributeList atts) {
107:                setAttributeList(atts);
108:            }
109:
110:            //////////////////////////////////////////////////////////////////////
111:            // Methods specific to this class.
112:            //////////////////////////////////////////////////////////////////////
113:
114:            /**
115:             * Set the attribute list, discarding previous contents.
116:             *
117:             * <p>This method allows an application writer to reuse an
118:             * attribute list easily.</p>
119:             *
120:             * @param atts The attribute list to copy.
121:             */
122:            public void setAttributeList(AttributeList atts) {
123:                int count = atts.getLength();
124:
125:                clear();
126:
127:                for (int i = 0; i < count; i++) {
128:                    addAttribute(atts.getName(i), atts.getType(i), atts
129:                            .getValue(i));
130:                }
131:            }
132:
133:            /**
134:             * Add an attribute to an attribute list.
135:             *
136:             * <p>This method is provided for SAX parser writers, to allow them
137:             * to build up an attribute list incrementally before delivering
138:             * it to the application.</p>
139:             *
140:             * @param name The attribute name.
141:             * @param type The attribute type ("NMTOKEN" for an enumeration).
142:             * @param value The attribute value (must not be null).
143:             * @see #removeAttribute
144:             * @see org.xml.sax.DocumentHandler#startElement
145:             */
146:            public void addAttribute(String name, String type, String value) {
147:                names.addElement(name);
148:                types.addElement(type);
149:                values.addElement(value);
150:            }
151:
152:            /**
153:             * Remove an attribute from the list.
154:             *
155:             * <p>SAX application writers can use this method to filter an
156:             * attribute out of an AttributeList.  Note that invoking this
157:             * method will change the length of the attribute list and
158:             * some of the attribute's indices.</p>
159:             *
160:             * <p>If the requested attribute is not in the list, this is
161:             * a no-op.</p>
162:             *
163:             * @param name The attribute name.
164:             * @see #addAttribute
165:             */
166:            public void removeAttribute(String name) {
167:                int i = names.indexOf(name);
168:
169:                if (i >= 0) {
170:                    names.removeElementAt(i);
171:                    types.removeElementAt(i);
172:                    values.removeElementAt(i);
173:                }
174:            }
175:
176:            /**
177:             * Clear the attribute list.
178:             *
179:             * <p>SAX parser writers can use this method to reset the attribute
180:             * list between DocumentHandler.startElement events.  Normally,
181:             * it will make sense to reuse the same AttributeListImpl object
182:             * rather than allocating a new one each time.</p>
183:             *
184:             * @see org.xml.sax.DocumentHandler#startElement
185:             */
186:            public void clear() {
187:                names.removeAllElements();
188:                types.removeAllElements();
189:                values.removeAllElements();
190:            }
191:
192:            //////////////////////////////////////////////////////////////////////
193:            // Implementation of org.xml.sax.AttributeList
194:            //////////////////////////////////////////////////////////////////////
195:
196:            /**
197:             * Return the number of attributes in the list.
198:             *
199:             * @return The number of attributes in the list.
200:             * @see org.xml.sax.AttributeList#getLength
201:             */
202:            public int getLength() {
203:                return names.size();
204:            }
205:
206:            /**
207:             * Get the name of an attribute (by position).
208:             *
209:             * @param i The position of the attribute in the list.
210:             * @return The attribute name as a string, or null if there
211:             *         is no attribute at that position.
212:             * @see org.xml.sax.AttributeList#getName(int)
213:             */
214:            public String getName(int i) {
215:                try {
216:                    return (String) names.elementAt(i);
217:                } catch (ArrayIndexOutOfBoundsException e) {
218:                    return null;
219:                }
220:            }
221:
222:            /**
223:             * Get the type of an attribute (by position).
224:             *
225:             * @param i The position of the attribute in the list.
226:             * @return The attribute type as a string ("NMTOKEN" for an
227:             *         enumeration, and "CDATA" if no declaration was
228:             *         read), or null if there is no attribute at
229:             *         that position.
230:             * @see org.xml.sax.AttributeList#getType(int)
231:             */
232:            public String getType(int i) {
233:                try {
234:                    return (String) types.elementAt(i);
235:                } catch (ArrayIndexOutOfBoundsException e) {
236:                    return null;
237:                }
238:            }
239:
240:            /**
241:             * Get the value of an attribute (by position).
242:             *
243:             * @param i The position of the attribute in the list.
244:             * @return The attribute value as a string, or null if
245:             *         there is no attribute at that position.
246:             * @see org.xml.sax.AttributeList#getValue(int)
247:             */
248:            public String getValue(int i) {
249:                try {
250:                    return (String) values.elementAt(i);
251:                } catch (ArrayIndexOutOfBoundsException e) {
252:                    return null;
253:                }
254:            }
255:
256:            /**
257:             * Get the type of an attribute (by name).
258:             *
259:             * @param name The attribute name.
260:             * @return The attribute type as a string ("NMTOKEN" for an
261:             *         enumeration, and "CDATA" if no declaration was
262:             *         read).
263:             * @see org.xml.sax.AttributeList#getType(java.lang.String)
264:             */
265:            public String getType(String name) {
266:                return getType(names.indexOf(name));
267:            }
268:
269:            /**
270:             * Get the value of an attribute (by name).
271:             *
272:             * @param name The attribute name.
273:             * @see org.xml.sax.AttributeList#getValue(java.lang.String)
274:             */
275:            public String getValue(String name) {
276:                return getValue(names.indexOf(name));
277:            }
278:
279:            //////////////////////////////////////////////////////////////////////
280:            // Internal state.
281:            //////////////////////////////////////////////////////////////////////
282:
283:            Vector names = new Vector();
284:            Vector types = new Vector();
285:            Vector values = new Vector();
286:
287:        }
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