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1
50
51 package org.apache.avalon.meta.info.builder;
52
53 import java.io.InputStream  ;
54 import java.util.Properties ;
55 import java.util.ArrayList ;
56 import org.apache.avalon.excalibur.i18n.ResourceManager;
57 import org.apache.avalon.excalibur.i18n.Resources;
58 import org.apache.avalon.framework.Version;
59 import org.apache.avalon.framework.configuration.Configuration;
60 import org.apache.avalon.framework.configuration.ConfigurationException;
61 import org.apache.avalon.meta.ConfigurationBuilder;
62 import org.apache.avalon.meta.info.Service;
63 import org.apache.avalon.meta.info.EntryDescriptor;
64 import org.apache.avalon.meta.info.ReferenceDescriptor;
65 import org.apache.avalon.meta.info.builder.BuildException;
66 import org.apache.excalibur.configuration.ConfigurationUtil;
67 import org.xml.sax.InputSource ;
68
69
76 public class XMLServiceCreator
77 implements ServiceCreator
78 {
79 private static final Resources REZ =
80 ResourceManager.getPackageResources( XMLServiceCreator.class );
81
82
90 public Service createService( String key, InputStream input )
91 throws Exception
92 {
93 if( input == null )
94 {
95 throw new NullPointerException ( "input" );
96 }
97
98 final InputSource source = new InputSource ( input );
99 final Configuration xservice = ConfigurationBuilder.build( source );
100 return build( key, xservice );
101 }
102
103
112 private Service build( final String classname, final Configuration info )
113 throws BuildException
114 {
115 final String topLevelName = info.getName();
116 if( !topLevelName.equals( "service" ) )
117 {
118 final String message =
119 REZ.getString( "builder.bad-toplevel-service-element.error",
120 classname,
121 topLevelName );
122 throw new BuildException( message );
123 }
124
125 final Properties attributes =
126 buildAttributes( info.getChild( "attributes" ) );
127 final EntryDescriptor[] entries =
128 buildEntries( info.getChild( "entries" ).getChildren("entry") );
129 final String versionString = info.getChild( "version" ).getValue( "1.0" );
130 final Version version = buildVersion( versionString );
131
132 return new Service( new ReferenceDescriptor( classname, version ), entries, attributes );
133 }
134
135
142 public Properties buildAttributes( final Configuration config )
143 throws BuildException
144 {
145 final Properties attributes = new Properties ();
146 final Configuration[] children = config.getChildren( "attribute" );
147 for( int i = 0; i < children.length; i++ )
148 {
149 Configuration child = children[ i ];
150 String key = null;
151 try
152 {
153 key = child.getAttribute( "key" );
154 }
155 catch( ConfigurationException ce )
156 {
157 final String error =
158 "Missing 'key' attribute in 'attribute' element.\n"
159 + ConfigurationUtil.list( child );
160 throw new BuildException( error, ce );
161 }
162
163 String value = null;
164 try
165 {
166 value = child.getAttribute( "value" );
167 }
168 catch( Throwable e )
169 {
170 value = child.getValue( "" );
171 }
172 attributes.setProperty( key, value );
173 }
174 return attributes;
175 }
176
177
185 protected EntryDescriptor[] buildEntries( final Configuration[] entrySet )
186 throws BuildException
187 {
188 final ArrayList entrys = new ArrayList ();
189
190 for( int i = 0; i < entrySet.length; i++ )
191 {
192 final EntryDescriptor service = buildEntry( entrySet[ i ] );
193 entrys.add( service );
194 }
195
196 return (EntryDescriptor[])entrys.toArray( new EntryDescriptor[ entrys.size() ] );
197 }
198
199
206 protected EntryDescriptor buildEntry( final Configuration config )
207 throws BuildException
208 {
209 try
210 {
211 final String key = config.getAttribute( "key" );
212 final String type = config.getAttribute( "type", "java.lang.String" );
213 final boolean isVolatile = config.getAttributeAsBoolean( "volatile", false );
214 final boolean optional =
215 config.getAttributeAsBoolean( "optional", false );
216 final String alias = config.getAttribute( "alias", null );
217 return new EntryDescriptor( key, type, optional, isVolatile, alias );
218 }
219 catch( Throwable e )
220 {
221 final String error =
222 "Unable to build entry descriptor."
223 + ConfigurationUtil.list( config );
224 throw new BuildException( error, e );
225 }
226 }
227
228
234 protected Version buildVersion( final String version )
235 throws BuildException
236 {
237 try
238 {
239 return Version.getVersion( version );
240 }
241 catch( Throwable e )
242 {
243 final String error =
244 REZ.getString( "builder.bad-version", version );
245 throw new BuildException( error, e );
246 }
247 }
248 }
249 |
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