Source Code Cross Referenced for AttributeListImpl.java in  » XML » Piccolo » org » xml » sax » helpers » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » Piccolo » org.xml.sax.helpers 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // SAX default implementation for AttributeList.
002:        // http://www.saxproject.org
003:        // No warranty; no copyright -- use this as you will.
004:        // $Id: AttributeListImpl.java,v 1.1.1.1 2002/05/03 23:29:42 yuvalo Exp $
005:
006:        package org.xml.sax.helpers;
007:
008:        import org.xml.sax.AttributeList;
009:
010:        import java.util.Vector;
011:
012:        /**
013:         * Default implementation for AttributeList.
014:         *
015:         * <blockquote>
016:         * <em>This module, both source code and documentation, is in the
017:         * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
018:         * See <a href='http://www.saxproject.org'>http://www.saxproject.org</a>
019:         * for further information.
020:         * </blockquote>
021:         *
022:         * <p>AttributeList implements the deprecated SAX1 {@link
023:         * org.xml.sax.AttributeList AttributeList} interface, and has been
024:         * replaced by the new SAX2 {@link org.xml.sax.helpers.AttributesImpl
025:         * AttributesImpl} interface.</p>
026:         *
027:         * <p>This class provides a convenience implementation of the SAX
028:         * {@link org.xml.sax.AttributeList AttributeList} interface.  This 
029:         * implementation is useful both for SAX parser writers, who can use 
030:         * it to provide attributes to the application, and for SAX application 
031:         * writers, who can use it to create a persistent copy of an element's 
032:         * attribute specifications:</p>
033:         *
034:         * <pre>
035:         * private AttributeList myatts;
036:         *
037:         * public void startElement (String name, AttributeList atts)
038:         * {
039:         *              // create a persistent copy of the attribute list
040:         *              // for use outside this method
041:         *   myatts = new AttributeListImpl(atts);
042:         *   [...]
043:         * }
044:         * </pre>
045:         *
046:         * <p>Please note that SAX parsers are not required to use this
047:         * class to provide an implementation of AttributeList; it is
048:         * supplied only as an optional convenience.  In particular, 
049:         * parser writers are encouraged to invent more efficient
050:         * implementations.</p>
051:         *
052:         * @deprecated This class implements a deprecated interface,
053:         *             {@link org.xml.sax.AttributeList AttributeList};
054:         *             that interface has been replaced by
055:         *             {@link org.xml.sax.Attributes Attributes},
056:         *             which is implemented in the
057:         *             {@link org.xml.sax.helpers.AttributesImpl 
058:         *            AttributesImpl} helper class.
059:         * @since SAX 1.0
060:         * @author David Megginson
061:         * @version 2.0.1 (sax2r2)
062:         * @see org.xml.sax.AttributeList
063:         * @see org.xml.sax.DocumentHandler#startElement 
064:         */
065:        public class AttributeListImpl implements  AttributeList {
066:
067:            /**
068:             * Create an empty attribute list.
069:             *
070:             * <p>This constructor is most useful for parser writers, who
071:             * will use it to create a single, reusable attribute list that
072:             * can be reset with the clear method between elements.</p>
073:             *
074:             * @see #addAttribute
075:             * @see #clear
076:             */
077:            public AttributeListImpl() {
078:            }
079:
080:            /**
081:             * Construct a persistent copy of an existing attribute list.
082:             *
083:             * <p>This constructor is most useful for application writers,
084:             * who will use it to create a persistent copy of an existing
085:             * attribute list.</p>
086:             *
087:             * @param atts The attribute list to copy
088:             * @see org.xml.sax.DocumentHandler#startElement
089:             */
090:            public AttributeListImpl(AttributeList atts) {
091:                setAttributeList(atts);
092:            }
093:
094:            ////////////////////////////////////////////////////////////////////
095:            // Methods specific to this class.
096:            ////////////////////////////////////////////////////////////////////
097:
098:            /**
099:             * Set the attribute list, discarding previous contents.
100:             *
101:             * <p>This method allows an application writer to reuse an
102:             * attribute list easily.</p>
103:             *
104:             * @param atts The attribute list to copy.
105:             */
106:            public void setAttributeList(AttributeList atts) {
107:                int count = atts.getLength();
108:
109:                clear();
110:
111:                for (int i = 0; i < count; i++) {
112:                    addAttribute(atts.getName(i), atts.getType(i), atts
113:                            .getValue(i));
114:                }
115:            }
116:
117:            /**
118:             * Add an attribute to an attribute list.
119:             *
120:             * <p>This method is provided for SAX parser writers, to allow them
121:             * to build up an attribute list incrementally before delivering
122:             * it to the application.</p>
123:             *
124:             * @param name The attribute name.
125:             * @param type The attribute type ("NMTOKEN" for an enumeration).
126:             * @param value The attribute value (must not be null).
127:             * @see #removeAttribute
128:             * @see org.xml.sax.DocumentHandler#startElement
129:             */
130:            public void addAttribute(String name, String type, String value) {
131:                names.addElement(name);
132:                types.addElement(type);
133:                values.addElement(value);
134:            }
135:
136:            /**
137:             * Remove an attribute from the list.
138:             *
139:             * <p>SAX application writers can use this method to filter an
140:             * attribute out of an AttributeList.  Note that invoking this
141:             * method will change the length of the attribute list and
142:             * some of the attribute's indices.</p>
143:             *
144:             * <p>If the requested attribute is not in the list, this is
145:             * a no-op.</p>
146:             *
147:             * @param name The attribute name.
148:             * @see #addAttribute
149:             */
150:            public void removeAttribute(String name) {
151:                int i = names.indexOf(name);
152:
153:                if (i >= 0) {
154:                    names.removeElementAt(i);
155:                    types.removeElementAt(i);
156:                    values.removeElementAt(i);
157:                }
158:            }
159:
160:            /**
161:             * Clear the attribute list.
162:             *
163:             * <p>SAX parser writers can use this method to reset the attribute
164:             * list between DocumentHandler.startElement events.  Normally,
165:             * it will make sense to reuse the same AttributeListImpl object
166:             * rather than allocating a new one each time.</p>
167:             *
168:             * @see org.xml.sax.DocumentHandler#startElement
169:             */
170:            public void clear() {
171:                names.removeAllElements();
172:                types.removeAllElements();
173:                values.removeAllElements();
174:            }
175:
176:            ////////////////////////////////////////////////////////////////////
177:            // Implementation of org.xml.sax.AttributeList
178:            ////////////////////////////////////////////////////////////////////
179:
180:            /**
181:             * Return the number of attributes in the list.
182:             *
183:             * @return The number of attributes in the list.
184:             * @see org.xml.sax.AttributeList#getLength
185:             */
186:            public int getLength() {
187:                return names.size();
188:            }
189:
190:            /**
191:             * Get the name of an attribute (by position).
192:             *
193:             * @param i The position of the attribute in the list.
194:             * @return The attribute name as a string, or null if there
195:             *         is no attribute at that position.
196:             * @see org.xml.sax.AttributeList#getName(int)
197:             */
198:            public String getName(int i) {
199:                if (i < 0) {
200:                    return null;
201:                }
202:                try {
203:                    return (String) names.elementAt(i);
204:                } catch (ArrayIndexOutOfBoundsException e) {
205:                    return null;
206:                }
207:            }
208:
209:            /**
210:             * Get the type of an attribute (by position).
211:             *
212:             * @param i The position of the attribute in the list.
213:             * @return The attribute type as a string ("NMTOKEN" for an
214:             *         enumeration, and "CDATA" if no declaration was
215:             *         read), or null if there is no attribute at
216:             *         that position.
217:             * @see org.xml.sax.AttributeList#getType(int)
218:             */
219:            public String getType(int i) {
220:                if (i < 0) {
221:                    return null;
222:                }
223:                try {
224:                    return (String) types.elementAt(i);
225:                } catch (ArrayIndexOutOfBoundsException e) {
226:                    return null;
227:                }
228:            }
229:
230:            /**
231:             * Get the value of an attribute (by position).
232:             *
233:             * @param i The position of the attribute in the list.
234:             * @return The attribute value as a string, or null if
235:             *         there is no attribute at that position.
236:             * @see org.xml.sax.AttributeList#getValue(int)
237:             */
238:            public String getValue(int i) {
239:                if (i < 0) {
240:                    return null;
241:                }
242:                try {
243:                    return (String) values.elementAt(i);
244:                } catch (ArrayIndexOutOfBoundsException e) {
245:                    return null;
246:                }
247:            }
248:
249:            /**
250:             * Get the type of an attribute (by name).
251:             *
252:             * @param name The attribute name.
253:             * @return The attribute type as a string ("NMTOKEN" for an
254:             *         enumeration, and "CDATA" if no declaration was
255:             *         read).
256:             * @see org.xml.sax.AttributeList#getType(java.lang.String)
257:             */
258:            public String getType(String name) {
259:                return getType(names.indexOf(name));
260:            }
261:
262:            /**
263:             * Get the value of an attribute (by name).
264:             *
265:             * @param name The attribute name.
266:             * @see org.xml.sax.AttributeList#getValue(java.lang.String)
267:             */
268:            public String getValue(String name) {
269:                return getValue(names.indexOf(name));
270:            }
271:
272:            ////////////////////////////////////////////////////////////////////
273:            // Internal state.
274:            ////////////////////////////////////////////////////////////////////
275:
276:            Vector names = new Vector();
277:            Vector types = new Vector();
278:            Vector values = new Vector();
279:
280:        }
281:
282:        // end of AttributeListImpl.java
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