|
1
55
56 package org.apache.avalon.framework.configuration;
57
58 import javax.xml.parsers.DocumentBuilder  ;
59 import javax.xml.parsers.DocumentBuilderFactory ;
60 import javax.xml.parsers.ParserConfigurationException ;
61 import org.w3c.dom.Document ;
62 import org.w3c.dom.Element ;
63 import org.w3c.dom.Text ;
64 import java.util.ArrayList ;
65 import java.util.Arrays ;
66 import java.util.Iterator ;
67
68
75 public class ConfigurationUtil
76 {
77
80 private ConfigurationUtil()
81 {
82 }
83
84
90 public static Element toElement( final Configuration configuration )
91 {
92 try
93 {
94 final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
95 final DocumentBuilder builder = factory.newDocumentBuilder();
96 final Document document = builder.newDocument();
97
98 return createElement( document, configuration );
99 }
100 catch( final ParserConfigurationException pce )
101 {
102 throw new IllegalStateException ( pce.toString() );
103 }
104 }
105
106
115 public static boolean equals( final Configuration c1, final Configuration c2 )
116 {
117 return c1.getName().equals( c2.getName() )
118 && areValuesEqual( c1, c2 )
119 && areAttributesEqual( c1, c2 )
120 && areChildrenEqual( c1, c2 );
121 }
122
123
130 private static boolean areChildrenEqual( final Configuration c1,
131 final Configuration c2 )
132 {
133 final Configuration[] kids1 = c1.getChildren();
134 final ArrayList kids2 = new ArrayList ( Arrays.asList( c2.getChildren() ) );
135 if( kids1.length != kids2.size() )
136 {
137 return false;
138 }
139
140 for( int i = 0; i < kids1.length; i++ )
141 {
142 if( !findMatchingChild( kids1[ i ], kids2 ) )
143 {
144 return false;
145 }
146 }
147
148 return kids2.isEmpty() ? true : false;
149 }
150
151
158 private static boolean findMatchingChild( final Configuration c,
159 final ArrayList matchAgainst )
160 {
161 final Iterator i = matchAgainst.iterator();
162 while( i.hasNext() )
163 {
164 if( equals( c, (Configuration)i.next() ) )
165 {
166 i.remove();
167 return true;
168 }
169 }
170
171 return false;
172 }
173
174
181 private static boolean areAttributesEqual( final Configuration c1,
182 final Configuration c2 )
183 {
184 final String [] names1 = c1.getAttributeNames();
185 final String [] names2 = c2.getAttributeNames();
186 if( names1.length != names2.length )
187 {
188 return false;
189 }
190
191 for( int i = 0; i < names1.length; i++ )
192 {
193 final String name = names1[ i ];
194 final String value1 = c1.getAttribute( name, null );
195 final String value2 = c2.getAttribute( name, null );
196 if( !value1.equals( value2 ) )
197 {
198 return false;
199 }
200 }
201
202 return true;
203 }
204
205
212 private static boolean areValuesEqual( final Configuration c1,
213 final Configuration c2 )
214 {
215 final String value1 = c1.getValue( null );
216 final String value2 = c2.getValue( null );
217 return ( value1 == null && value2 == null )
218 || ( value1 != null && value1.equals( value2 ) );
219 }
220
221
229 private static Element createElement( final Document document,
230 final Configuration configuration )
231 {
232 final Element element = document.createElement( configuration.getName() );
233
234 final String content = configuration.getValue( null );
235 if( null != content )
236 {
237 final Text child = document.createTextNode( content );
238 element.appendChild( child );
239 }
240
241 final String [] names = configuration.getAttributeNames();
242 for( int i = 0; i < names.length; i++ )
243 {
244 final String name = names[ i ];
245 final String value = configuration.getAttribute( name, null );
246 element.setAttribute( name, value );
247 }
248 final Configuration[] children = configuration.getChildren();
249 for( int i = 0; i < children.length; i++ )
250 {
251 final Element child = createElement( document, children[ i ] );
252 element.appendChild( child );
253 }
254 return element;
255 }
256 }
257 |
Popular Tags |
Java API By Example, From Geeks To Geeks.