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  1. Project Clover database Wed Oct 31 2018 15:13:58 GMT
  2. Package org.xml.sax.helpers

File AttributeListImpl.java

 

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AttributeListImpl 66 34 20 56
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1    // SAX default implementation for AttributeList.
2    // http://www.saxproject.org
3    // No warranty; no copyright -- use this as you will.
4    // $Id: AttributeListImpl.java,v 1.6 2002/01/30 20:52:22 dbrownell Exp $
5   
6    package org.xml.sax.helpers;
7   
8    import org.xml.sax.AttributeList;
9   
10    import java.util.Vector;
11   
12   
13    /**e
14    * Default implementation for AttributeList.
15    *
16    * <blockquote>
17    * <em>This module, both source code and documentation, is in the
18    * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
19    * See <a href='http://www.saxproject.org'>http://www.saxproject.org</a>
20    * for further information.
21    * </blockquote>
22    *
23    * <p>AttributeList implements the deprecated SAX1 {@link
24    * org.xml.sax.AttributeList AttributeList} interface, and has been
25    * replaced by the new SAX2 {@link org.xml.sax.helpers.AttributesImpl
26    * AttributesImpl} interface.</p>
27    *
28    * <p>This class provides a convenience implementation of the SAX
29    * {@link org.xml.sax.AttributeList AttributeList} interface. This
30    * implementation is useful both for SAX parser writers, who can use
31    * it to provide attributes to the application, and for SAX application
32    * writers, who can use it to create a persistent copy of an element's
33    * attribute specifications:</p>
34    *
35    * <pre>
36    * private AttributeList myatts;
37    *
38    * public void startElement (String name, AttributeList atts)
39    * {
40    * // create a persistent copy of the attribute list
41    * // for use outside this method
42    * myatts = new AttributeListImpl(atts);
43    * [...]
44    * }
45    * </pre>
46    *
47    * <p>Please note that SAX parsers are not required to use this
48    * class to provide an implementation of AttributeList; it is
49    * supplied only as an optional convenience. In particular,
50    * parser writers are encouraged to invent more efficient
51    * implementations.</p>
52    *
53    * @deprecated This class implements a deprecated interface,
54    * {@link org.xml.sax.AttributeList AttributeList};
55    * that interface has been replaced by
56    * {@link org.xml.sax.Attributes Attributes},
57    * which is implemented in the
58    * {@link org.xml.sax.helpers.AttributesImpl
59    * AttributesImpl} helper class.
60    * @since SAX 1.0
61    * @author David Megginson
62    * @version 2.0.1 (sax2r2)
63    * @see org.xml.sax.AttributeList
64    * @see org.xml.sax.DocumentHandler#startElement
65    */
 
66    public class AttributeListImpl implements AttributeList
67    {
68   
69    /**
70    * Create an empty attribute list.
71    *
72    * <p>This constructor is most useful for parser writers, who
73    * will use it to create a single, reusable attribute list that
74    * can be reset with the clear method between elements.</p>
75    *
76    * @see #addAttribute
77    * @see #clear
78    */
 
79  0 toggle public AttributeListImpl ()
80    {
81    }
82   
83   
84    /**
85    * Construct a persistent copy of an existing attribute list.
86    *
87    * <p>This constructor is most useful for application writers,
88    * who will use it to create a persistent copy of an existing
89    * attribute list.</p>
90    *
91    * @param atts The attribute list to copy
92    * @see org.xml.sax.DocumentHandler#startElement
93    */
 
94  0 toggle public AttributeListImpl (AttributeList atts)
95    {
96  0 setAttributeList(atts);
97    }
98   
99   
100   
101    ////////////////////////////////////////////////////////////////////
102    // Methods specific to this class.
103    ////////////////////////////////////////////////////////////////////
104   
105   
106    /**
107    * Set the attribute list, discarding previous contents.
108    *
109    * <p>This method allows an application writer to reuse an
110    * attribute list easily.</p>
111    *
112    * @param atts The attribute list to copy.
113    */
 
114  0 toggle public void setAttributeList (AttributeList atts)
115    {
116  0 int count = atts.getLength();
117   
118  0 clear();
119   
120  0 for (int i = 0; i < count; i++) {
121  0 addAttribute(atts.getName(i), atts.getType(i), atts.getValue(i));
122    }
123    }
124   
125   
126    /**
127    * Add an attribute to an attribute list.
128    *
129    * <p>This method is provided for SAX parser writers, to allow them
130    * to build up an attribute list incrementally before delivering
131    * it to the application.</p>
132    *
133    * @param name The attribute name.
134    * @param type The attribute type ("NMTOKEN" for an enumeration).
135    * @param value The attribute value (must not be null).
136    * @see #removeAttribute
137    * @see org.xml.sax.DocumentHandler#startElement
138    */
 
139  0 toggle public void addAttribute (String name, String type, String value)
140    {
141  0 names.addElement(name);
142  0 types.addElement(type);
143  0 values.addElement(value);
144    }
145   
146   
147    /**
148    * Remove an attribute from the list.
149    *
150    * <p>SAX application writers can use this method to filter an
151    * attribute out of an AttributeList. Note that invoking this
152    * method will change the length of the attribute list and
153    * some of the attribute's indices.</p>
154    *
155    * <p>If the requested attribute is not in the list, this is
156    * a no-op.</p>
157    *
158    * @param name The attribute name.
159    * @see #addAttribute
160    */
 
161  0 toggle public void removeAttribute (String name)
162    {
163  0 int i = names.indexOf(name);
164   
165  0 if (i >= 0) {
166  0 names.removeElementAt(i);
167  0 types.removeElementAt(i);
168  0 values.removeElementAt(i);
169    }
170    }
171   
172   
173    /**
174    * Clear the attribute list.
175    *
176    * <p>SAX parser writers can use this method to reset the attribute
177    * list between DocumentHandler.startElement events. Normally,
178    * it will make sense to reuse the same AttributeListImpl object
179    * rather than allocating a new one each time.</p>
180    *
181    * @see org.xml.sax.DocumentHandler#startElement
182    */
 
183  0 toggle public void clear ()
184    {
185  0 names.removeAllElements();
186  0 types.removeAllElements();
187  0 values.removeAllElements();
188    }
189   
190   
191   
192    ////////////////////////////////////////////////////////////////////
193    // Implementation of org.xml.sax.AttributeList
194    ////////////////////////////////////////////////////////////////////
195   
196   
197    /**
198    * Return the number of attributes in the list.
199    *
200    * @return The number of attributes in the list.
201    * @see org.xml.sax.AttributeList#getLength
202    */
 
203  0 toggle @Override
204    public int getLength ()
205    {
206  0 return names.size();
207    }
208   
209   
210    /**
211    * Get the name of an attribute (by position).
212    *
213    * @param i The position of the attribute in the list.
214    * @return The attribute name as a string, or null if there
215    * is no attribute at that position.
216    * @see org.xml.sax.AttributeList#getName(int)
217    */
 
218  0 toggle @Override
219    public String getName (int i)
220    {
221  0 if (i < 0) {
222  0 return null;
223    }
224  0 try {
225  0 return (String)names.elementAt(i);
226    } catch (ArrayIndexOutOfBoundsException e) {
227  0 return null;
228    }
229    }
230   
231   
232    /**
233    * Get the type of an attribute (by position).
234    *
235    * @param i The position of the attribute in the list.
236    * @return The attribute type as a string ("NMTOKEN" for an
237    * enumeration, and "CDATA" if no declaration was
238    * read), or null if there is no attribute at
239    * that position.
240    * @see org.xml.sax.AttributeList#getType(int)
241    */
 
242  0 toggle @Override
243    public String getType (int i)
244    {
245  0 if (i < 0) {
246  0 return null;
247    }
248  0 try {
249  0 return (String)types.elementAt(i);
250    } catch (ArrayIndexOutOfBoundsException e) {
251  0 return null;
252    }
253    }
254   
255   
256    /**
257    * Get the value of an attribute (by position).
258    *
259    * @param i The position of the attribute in the list.
260    * @return The attribute value as a string, or null if
261    * there is no attribute at that position.
262    * @see org.xml.sax.AttributeList#getValue(int)
263    */
 
264  0 toggle @Override
265    public String getValue (int i)
266    {
267  0 if (i < 0) {
268  0 return null;
269    }
270  0 try {
271  0 return (String)values.elementAt(i);
272    } catch (ArrayIndexOutOfBoundsException e) {
273  0 return null;
274    }
275    }
276   
277   
278    /**
279    * Get the type of an attribute (by name).
280    *
281    * @param name The attribute name.
282    * @return The attribute type as a string ("NMTOKEN" for an
283    * enumeration, and "CDATA" if no declaration was
284    * read).
285    * @see org.xml.sax.AttributeList#getType(java.lang.String)
286    */
 
287  0 toggle @Override
288    public String getType (String name)
289    {
290  0 return getType(names.indexOf(name));
291    }
292   
293   
294    /**
295    * Get the value of an attribute (by name).
296    *
297    * @param name The attribute name.
298    * @see org.xml.sax.AttributeList#getValue(java.lang.String)
299    */
 
300  0 toggle @Override
301    public String getValue (String name)
302    {
303  0 return getValue(names.indexOf(name));
304    }
305   
306   
307   
308    ////////////////////////////////////////////////////////////////////
309    // Internal state.
310    ////////////////////////////////////////////////////////////////////
311   
312    Vector names = new Vector();
313    Vector types = new Vector();
314    Vector values = new Vector();
315   
316    }
317   
318    // end of AttributeListImpl.java