##### Coverage Report - org.jaxen.saxpath.helpers.XPathReaderFactory

Classes in this File | Line Coverage | Branch Coverage | Complexity
XPathReaderFactory |
73% |
100% |
| 5.0;5

1 |  |
     /*
2 |  |
      * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/saxpath/helpers/XPathReaderFactory.java,v 1.7 2005/06/28 13:44:46 elharo Exp $
3 |  |
      * $Revision: 1.7 $
4 |  |
      * $Date: 2005/06/28 13:44:46 $
5 |  |
      *
6 |  |
      * ====================================================================
7 |  |
      *
8 |  |
      * Copyright (C) 2000-2002 bob mcwhirter & James Strachan.
9 |  |
      * All rights reserved.
10 |  |
      *
11 |  |
      * Redistribution and use in source and binary forms, with or without
12 |  |
      * modification, are permitted provided that the following conditions
13 |  |
      * are met:
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      *
15 |  |
      * 1. Redistributions of source code must retain the above copyright
16 |  |
      *    notice, this list of conditions, and the following disclaimer.
17 |  |
      *
18 |  |
      * 2. Redistributions in binary form must reproduce the above copyright
19 |  |
      *    notice, this list of conditions, and the disclaimer that follows
20 |  |
      *    these conditions in the documentation and/or other materials
21 |  |
      *    provided with the distribution.
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      *
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      * 3. The name "Jaxen" must not be used to endorse or promote products
24 |  |
      *    derived from this software without prior written permission.  For
25 |  |
      *    written permission, please contact license@jaxen.org.
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      *
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      * 4. Products derived from this software may not be called "Jaxen", nor
28 |  |
      *    may "Jaxen" appear in their name, without prior written permission
29 |  |
      *    from the Jaxen Project Management (pm@jaxen.org).
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      *
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      * In addition, we request (but do not require) that you include in the
32 |  |
      * end-user documentation provided with the redistribution and/or in the
33 |  |
      * software itself an acknowledgement equivalent to the following:
34 |  |
      *     "This product includes software developed by the
35 |  |
      *      Jaxen Project <http://www.jaxen.org/>."
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      * Alternatively, the acknowledgment may be graphical using the logos
37 |  |
      * available at http://www.jaxen.org/
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      *
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      * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
40 |  |
      * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
41 |  |
      * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
42 |  |
      * DISCLAIMED.  IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT
43 |  |
      * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 |  |
      * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
45 |  |
      * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
46 |  |
      * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
47 |  |
      * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
48 |  |
      * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
49 |  |
      * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 |  |
      * SUCH DAMAGE.
51 |  |
      *
52 |  |
      * ====================================================================
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      * This software consists of voluntary contributions made by many
54 |  |
      * individuals on behalf of the Jaxen Project and was originally
55 |  |
      * created by bob mcwhirter <bob@werken.com> and
56 |  |
      * James Strachan <jstrachan@apache.org>.  For more information on the
57 |  |
      * Jaxen Project, please see <http://www.jaxen.org/>.
58 |  |
      *
59 |  |
      * $Id: XPathReaderFactory.java,v 1.7 2005/06/28 13:44:46 elharo Exp $
60 |  |
      */
61 |  |
62 |  |
63 |  |
64 |  |
65 |  |
     package org.jaxen.saxpath.helpers;
66 |  |
67 |  |
     import org.jaxen.saxpath.SAXPathException;
68 |  |
     import org.jaxen.saxpath.XPathReader;
69 |  |
70 |  |
     /** Create an {@link org.jaxen.saxpath.XPathReader} from
71 |  |
      *  either a system property, or a named class.
72 |  |
      *
73 |  |
      *  <p>
74 |  |
      *  Similar to the SAX API, the <code>XPathReaderFactory</code>
75 |  |
      *  can create an <code>XPathReader</code> from a name of a
76 |  |
      *  class passed in directly, or by inspecting the system
77 |  |
      *  property <code>org.saxpath.driver</code>.
78 |  |
      *
79 |  |
      *  @author bob mcwhirter (bob@werken.com)
80 |  |
      */
81 |  |
     public class XPathReaderFactory
82 |  |
     {
83 |  |
         /** The <code>org.saxpath.driver</code> property name. */
84 |  |
         public static final String DRIVER_PROPERTY = "org.saxpath.driver";
85 |  |
86 |  |
         /** The default driver to use if none is configured. */
87 |  |
         protected static final String DEFAULT_DRIVER = "org.jaxen.saxpath.base.XPathReader";
88 |  |
89 | 0 |
         private XPathReaderFactory() {}
90 |  |
91 |  |
92 |  |
         /** Create an <code>XPathReader</code> using the value of
93 |  |
          *  the <code>org.saxpath.driver</code> system property.
94 |  |
          *
95 |  |
          *  @return an instance of the <code>XPathReader</code> specified
96 |  |
          *          by the <code>org.saxpath.driver</code> property
97 |  |
          *
98 |  |
          *  @throws SAXPathException if the property is  not set, or if
99 |  |
          *          the class can not be instantiated for some reason,
100 |  |
          *          or if the class doesn't implement the <code>XPathReader</code>
101 |  |
          *          interface
102 |  |
          */
103 |  |
         public static XPathReader createReader() throws SAXPathException
104 |  |
         {
105 | 10752 |
             String className = null;
106 |  |
107 |  |
             try
108 |  |
             {
109 | 10752 |
                 className = System.getProperty( DRIVER_PROPERTY );
110 |  |
             }
111 | 0 |
             catch (SecurityException e)
112 |  |
             {
113 |  |
                 // we'll use the default
114 | 10752 |
             }
115 |  |
116 | 10752 |
             if ( className == null
117 |  |
                  ||
118 |  |
                  className.length() == 0 )
119 |  |
             {
120 | 10728 |
                 className = DEFAULT_DRIVER;
121 |  |
             }
122 |  |
123 | 10752 |
             return createReader( className );
124 |  |
         }
125 |  |
126 |  |
         /** Create an <code>XPathReader</code> using the passed
127 |  |
          *  in class name.
128 |  |
          *
129 |  |
          *  @param className the name of the class that implements
130 |  |
          *         the <code>XPathReader</code> interface.
131 |  |
          *
132 |  |
          *  @return an XPathReader
133 |  |
          *
134 |  |
          *  @throws SAXPathException if the class cannot be
135 |  |
          *          instantiated for some reason, or if the
136 |  |
          *          class doesn't implement the <code>XPathReader</code>
137 |  |
          *          interface
138 |  |
          */
139 |  |
         public static XPathReader createReader(String className) throws SAXPathException
140 |  |
         {
141 | 10770 |
             Class readerClass  = null;
142 | 10770 |
             XPathReader reader = null;
143 |  |
144 |  |
             try
145 |  |
             {
146 |  |
                 // Use the full version of Class.forName(), so as to
147 |  |
                 // work better in sandboxed environments, such as
148 |  |
                 // servlet containers and applets.
149 |  |
150 | 10770 |
                 readerClass = Class.forName( className,
151 |  |
                                              true,
152 | 636 |
                                              XPathReaderFactory.class.getClassLoader() );
153 |  |
154 |  |
                 // Double-check that it's actually the right kind of class
155 |  |
                 // before attempting instantiation.
156 |  |
157 | 10758 |
                 if ( ! XPathReader.class.isAssignableFrom( readerClass ) )
158 |  |
                 {
159 | 18 |
                     throw new SAXPathException( "Class [" + className
160 |  |
                       + "] does not implement the org.jaxen.saxpath.XPathReader interface." );
161 |  |
                 }
162 |  |
             }
163 | 12 |
             catch (ClassNotFoundException e)
164 |  |
             {
165 | 12 |
                 throw new SAXPathException( e );
166 | 10740 |
             }
167 |  |
168 |  |
             try
169 |  |
             {
170 | 10740 |
                 reader = (XPathReader) readerClass.newInstance();
171 |  |
             }
172 | 0 |
             catch (IllegalAccessException e)
173 |  |
             {
174 | 0 |
                 throw new SAXPathException( e );
175 |  |
             }
176 | 0 |
             catch (InstantiationException e)
177 |  |
             {
178 | 0 |
                 throw new SAXPathException( e );
179 | 10740 |
             }
180 |  |
181 | 10740 |
             if ( reader == null )
182 |  |
             {
183 | 0 |
                 throw new SAXPathException( "Unable to create XPathReader" );
184 |  |
             }
185 |  |
186 | 10740 |
             return reader;
187 |  |
         }
188 |  |
     }