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1 /*
2  * The Apache Software License, Version 1.1
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4  *
5  * Copyright (c) 2001-2003 The Apache Software Foundation. All rights
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9  * modification, are permitted provided that the following conditions
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13  * notice, this list of conditions and the following disclaimer.
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24  * Alternately, this acknowledgment may appear in the software itself,
25  * if and wherever such third-party acknowledgments normally appear.
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55
56 package org.jboss.axis.message;
57
58 import org.xml.sax.Attributes JavaDoc;
59
60 /**
61  * Null implementation of the Attributes interface.
62  *
63  * @author David Megginson
64  * @author Sam Ruby <rubys@us.ibm.com>
65  */
66 public class NullAttributes implements Attributes JavaDoc
67 {
68
69    public static final NullAttributes singleton = new NullAttributes();
70
71    ////////////////////////////////////////////////////////////////////
72 // Implementation of org.xml.sax.Attributes.
73 ////////////////////////////////////////////////////////////////////
74
75
76    /**
77     * Return the number of attributes in the list.
78     *
79     * @return The number of attributes in the list.
80     * @see org.xml.sax.Attributes#getLength
81     */
82    public int getLength()
83    {
84       return 0;
85    }
86
87
88    /**
89     * Return an attribute's Namespace URI.
90     *
91     * @param index The attribute's index (zero-based).
92     * @return The Namespace URI, the empty string if none is
93     * available, or null if the index is out of range.
94     * @see org.xml.sax.Attributes#getURI
95     */
96    public String JavaDoc getURI(int index)
97    {
98       return null;
99    }
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 JavaDoc getLocalName(int index)
111    {
112       return null;
113    }
114
115
116    /**
117     * Return an attribute's qualified (prefixed) name.
118     *
119     * @param index The attribute's index (zero-based).
120     * @return The attribute's qualified name, the empty string if
121     * none is available, or null if the index is out of bounds.
122     * @see org.xml.sax.Attributes#getQName
123     */
124    public String JavaDoc getQName(int index)
125    {
126       return null;
127    }
128
129
130    /**
131     * Return an attribute's type by index.
132     *
133     * @param index The attribute's index (zero-based).
134     * @return The attribute's type, "CDATA" if the type is unknown, or null
135     * if the index is out of bounds.
136     * @see org.xml.sax.Attributes#getType(int)
137     */
138    public String JavaDoc getType(int index)
139    {
140       return null;
141    }
142
143
144    /**
145     * Return an attribute's value by index.
146     *
147     * @param index The attribute's index (zero-based).
148     * @return The attribute's value or null if the index is out of bounds.
149     * @see org.xml.sax.Attributes#getValue(int)
150     */
151    public String JavaDoc getValue(int index)
152    {
153       return null;
154    }
155
156
157    /**
158     * Look up an attribute's index by Namespace name.
159     * <p/>
160     * <p>In many cases, it will be more efficient to look up the name once and
161     * use the index query methods rather than using the name query methods
162     * repeatedly.</p>
163     *
164     * @param uri The attribute's Namespace URI, or the empty
165     * string if none is available.
166     * @param localName The attribute's local name.
167     * @return The attribute's index, or -1 if none matches.
168     * @see org.xml.sax.Attributes#getIndex(java.lang.String,java.lang.String)
169     */
170    public int getIndex(String JavaDoc uri, String JavaDoc localName)
171    {
172       return -1;
173    }
174
175
176    /**
177     * Look up an attribute's index by qualified (prefixed) name.
178     *
179     * @param qName The qualified name.
180     * @return The attribute's index, or -1 if none matches.
181     * @see org.xml.sax.Attributes#getIndex(java.lang.String)
182     */
183    public int getIndex(String JavaDoc qName)
184    {
185       return -1;
186    }
187
188
189    /**
190     * Look up an attribute's type by Namespace-qualified name.
191     *
192     * @param uri The Namespace URI, or the empty string for a name
193     * with no explicit Namespace URI.
194     * @param localName The local name.
195     * @return The attribute's type, or null if there is no
196     * matching attribute.
197     * @see org.xml.sax.Attributes#getType(java.lang.String,java.lang.String)
198     */
199    public String JavaDoc getType(String JavaDoc uri, String JavaDoc localName)
200    {
201       return null;
202    }
203
204
205    /**
206     * Look up an attribute's type by qualified (prefixed) name.
207     *
208     * @param qName The qualified name.
209     * @return The attribute's type, or null if there is no
210     * matching attribute.
211     * @see org.xml.sax.Attributes#getType(java.lang.String)
212     */
213    public String JavaDoc getType(String JavaDoc qName)
214    {
215       return null;
216    }
217
218
219    /**
220     * Look up an attribute's value by Namespace-qualified name.
221     *
222     * @param uri The Namespace URI, or the empty string for a name
223     * with no explicit Namespace URI.
224     * @param localName The local name.
225     * @return The attribute's value, or null if there is no
226     * matching attribute.
227     * @see org.xml.sax.Attributes#getValue(java.lang.String,java.lang.String)
228     */
229    public String JavaDoc getValue(String JavaDoc uri, String JavaDoc localName)
230    {
231       return null;
232    }
233
234
235    /**
236     * Look up an attribute's value by qualified (prefixed) name.
237     *
238     * @param qName The qualified name.
239     * @return The attribute's value, or null if there is no
240     * matching attribute.
241     * @see org.xml.sax.Attributes#getValue(java.lang.String)
242     */
243    public String JavaDoc getValue(String JavaDoc qName)
244    {
245       return null;
246    }
247 }
248
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