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Java > Open Source Codes > org > xml > sax > helpers > LocatorImpl


1 // SAX default implementation for Locator.
2 // http://www.saxproject.org
3 // No warranty; no copyright -- use this as you will.
4 // $Id: LocatorImpl.java,v 1.1.24.1 2004/05/01 08:34:45 jsuttor Exp $
5
6 package org.xml.sax.helpers;
7
8 import org.xml.sax.Locator JavaDoc;
9
10
11 /**
12  * Provide an optional convenience implementation of Locator.
13  *
14  * <blockquote>
15  * <em>This module, both source code and documentation, is in the
16  * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
17  * See <a HREF='http://www.saxproject.org'>http://www.saxproject.org</a>
18  * for further information.
19  * </blockquote>
20  *
21  * <p>This class is available mainly for application writers, who
22  * can use it to make a persistent snapshot of a locator at any
23  * point during a document parse:</p>
24  *
25  * <pre>
26  * Locator locator;
27  * Locator startloc;
28  *
29  * public void setLocator (Locator locator)
30  * {
31  * // note the locator
32  * this.locator = locator;
33  * }
34  *
35  * public void startDocument ()
36  * {
37  * // save the location of the start of the document
38  * // for future use.
39  * Locator startloc = new LocatorImpl(locator);
40  * }
41  *</pre>
42  *
43  * <p>Normally, parser writers will not use this class, since it
44  * is more efficient to provide location information only when
45  * requested, rather than constantly updating a Locator object.</p>
46  *
47  * @since SAX 1.0
48  * @author David Megginson
49  * @version 2.0.1 (sax2r2)
50  * @see org.xml.sax.Locator Locator
51  */
52 public class LocatorImpl implements Locator JavaDoc
53 {
54     
55     
56     /**
57      * Zero-argument constructor.
58      *
59      * <p>This will not normally be useful, since the main purpose
60      * of this class is to make a snapshot of an existing Locator.</p>
61      */
62     public LocatorImpl ()
63     {
64     }
65     
66     
67     /**
68      * Copy constructor.
69      *
70      * <p>Create a persistent copy of the current state of a locator.
71      * When the original locator changes, this copy will still keep
72      * the original values (and it can be used outside the scope of
73      * DocumentHandler methods).</p>
74      *
75      * @param locator The locator to copy.
76      */
77     public LocatorImpl (Locator JavaDoc locator)
78     {
79     setPublicId(locator.getPublicId());
80     setSystemId(locator.getSystemId());
81     setLineNumber(locator.getLineNumber());
82     setColumnNumber(locator.getColumnNumber());
83     }
84     
85     
86
87     ////////////////////////////////////////////////////////////////////
88 // Implementation of org.xml.sax.Locator
89 ////////////////////////////////////////////////////////////////////
90
91     
92     /**
93      * Return the saved public identifier.
94      *
95      * @return The public identifier as a string, or null if none
96      * is available.
97      * @see org.xml.sax.Locator#getPublicId
98      * @see #setPublicId
99      */
100     public String JavaDoc getPublicId ()
101     {
102     return publicId;
103     }
104     
105     
106     /**
107      * Return the saved system identifier.
108      *
109      * @return The system identifier as a string, or null if none
110      * is available.
111      * @see org.xml.sax.Locator#getSystemId
112      * @see #setSystemId
113      */
114     public String JavaDoc getSystemId ()
115     {
116     return systemId;
117     }
118     
119     
120     /**
121      * Return the saved line number (1-based).
122      *
123      * @return The line number as an integer, or -1 if none is available.
124      * @see org.xml.sax.Locator#getLineNumber
125      * @see #setLineNumber
126      */
127     public int getLineNumber ()
128     {
129     return lineNumber;
130     }
131     
132     
133     /**
134      * Return the saved column number (1-based).
135      *
136      * @return The column number as an integer, or -1 if none is available.
137      * @see org.xml.sax.Locator#getColumnNumber
138      * @see #setColumnNumber
139      */
140     public int getColumnNumber ()
141     {
142     return columnNumber;
143     }
144     
145     
146
147     ////////////////////////////////////////////////////////////////////
148 // Setters for the properties (not in org.xml.sax.Locator)
149 ////////////////////////////////////////////////////////////////////
150
151     
152     /**
153      * Set the public identifier for this locator.
154      *
155      * @param publicId The new public identifier, or null
156      * if none is available.
157      * @see #getPublicId
158      */
159     public void setPublicId (String JavaDoc publicId)
160     {
161     this.publicId = publicId;
162     }
163     
164     
165     /**
166      * Set the system identifier for this locator.
167      *
168      * @param systemId The new system identifier, or null
169      * if none is available.
170      * @see #getSystemId
171      */
172     public void setSystemId (String JavaDoc systemId)
173     {
174     this.systemId = systemId;
175     }
176     
177     
178     /**
179      * Set the line number for this locator (1-based).
180      *
181      * @param lineNumber The line number, or -1 if none is available.
182      * @see #getLineNumber
183      */
184     public void setLineNumber (int lineNumber)
185     {
186     this.lineNumber = lineNumber;
187     }
188     
189     
190     /**
191      * Set the column number for this locator (1-based).
192      *
193      * @param columnNumber The column number, or -1 if none is available.
194      * @see #getColumnNumber
195      */
196     public void setColumnNumber (int columnNumber)
197     {
198     this.columnNumber = columnNumber;
199     }
200     
201     
202
203     ////////////////////////////////////////////////////////////////////
204 // Internal state.
205 ////////////////////////////////////////////////////////////////////
206
207     private String JavaDoc publicId;
208     private String JavaDoc systemId;
209     private int lineNumber;
210     private int columnNumber;
211     
212 }
213
214 // end of LocatorImpl.java
215
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