001    package org.apache.maven.configuration.internal;
002    
003    /*
004     * Licensed to the Apache Software Foundation (ASF) under one
005     * or more contributor license agreements.  See the NOTICE file
006     * distributed with this work for additional information
007     * regarding copyright ownership.  The ASF licenses this file
008     * to you under the Apache License, Version 2.0 (the
009     * "License"); you may not use this file except in compliance
010     * with the License.  You may obtain a copy of the License at
011     *
012     *   http://www.apache.org/licenses/LICENSE-2.0
013     *
014     * Unless required by applicable law or agreed to in writing,
015     * software distributed under the License is distributed on an
016     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017     * KIND, either express or implied.  See the License for the
018     * specific language governing permissions and limitations
019     * under the License.
020     */
021    
022    import java.io.File;
023    
024    import org.apache.maven.configuration.BeanConfigurationException;
025    import org.apache.maven.configuration.BeanConfigurationPathTranslator;
026    import org.apache.maven.configuration.BeanConfigurationRequest;
027    import org.apache.maven.configuration.BeanConfigurationValuePreprocessor;
028    import org.apache.maven.configuration.BeanConfigurator;
029    import org.codehaus.plexus.component.annotations.Component;
030    import org.codehaus.plexus.component.configurator.ComponentConfigurationException;
031    import org.codehaus.plexus.component.configurator.converters.composite.ObjectWithFieldsConverter;
032    import org.codehaus.plexus.component.configurator.converters.lookup.ConverterLookup;
033    import org.codehaus.plexus.component.configurator.converters.lookup.DefaultConverterLookup;
034    import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluationException;
035    import org.codehaus.plexus.component.configurator.expression.TypeAwareExpressionEvaluator;
036    import org.codehaus.plexus.configuration.PlexusConfiguration;
037    import org.codehaus.plexus.configuration.xml.XmlPlexusConfiguration;
038    import org.codehaus.plexus.util.xml.Xpp3Dom;
039    
040    /**
041     * <strong>Warning:</strong> This is an internal class that is only public for technical reasons, it is not part of the
042     * public API. In particular, this class can be changed or deleted without prior notice.
043     * 
044     * @author Benjamin Bentmann
045     */
046    @Component( role = BeanConfigurator.class )
047    public class DefaultBeanConfigurator
048        implements BeanConfigurator
049    {
050    
051        private final ConverterLookup converterLookup = new DefaultConverterLookup();
052    
053        public void configureBean( BeanConfigurationRequest request )
054            throws BeanConfigurationException
055        {
056            if ( request == null )
057            {
058                throw new IllegalArgumentException( "bean configuration request not specified" );
059            }
060    
061            if ( request.getBean() == null )
062            {
063                throw new IllegalArgumentException( "bean to be configured not specified" );
064            }
065    
066            Object configuration = request.getConfiguration();
067            if ( configuration == null )
068            {
069                return;
070            }
071    
072            PlexusConfiguration plexusConfig = null;
073            if ( configuration instanceof PlexusConfiguration )
074            {
075                plexusConfig = (PlexusConfiguration) configuration;
076            }
077            else if ( configuration instanceof Xpp3Dom )
078            {
079                plexusConfig = new XmlPlexusConfiguration( (Xpp3Dom) configuration );
080            }
081            else
082            {
083                throw new BeanConfigurationException( "unsupported bean configuration source ("
084                    + configuration.getClass().getName() + ")" );
085            }
086    
087            if ( request.getConfigurationElement() != null )
088            {
089                plexusConfig = plexusConfig.getChild( request.getConfigurationElement() );
090            }
091    
092            ClassLoader classLoader = request.getClassLoader();
093            if ( classLoader == null )
094            {
095                classLoader = request.getBean().getClass().getClassLoader();
096            }
097    
098            BeanExpressionEvaluator evaluator = new BeanExpressionEvaluator( request );
099    
100            ObjectWithFieldsConverter converter = new ObjectWithFieldsConverter();
101    
102            try
103            {
104                converter.processConfiguration( converterLookup, request.getBean(), classLoader, plexusConfig, evaluator );
105            }
106            catch ( ComponentConfigurationException e )
107            {
108                throw new BeanConfigurationException( e.getMessage(), e );
109            }
110        }
111    
112        static class BeanExpressionEvaluator
113            implements TypeAwareExpressionEvaluator
114        {
115    
116            private final BeanConfigurationValuePreprocessor preprocessor;
117    
118            private final BeanConfigurationPathTranslator translator;
119    
120            public BeanExpressionEvaluator( BeanConfigurationRequest request )
121            {
122                preprocessor = request.getValuePreprocessor();
123                translator = request.getPathTranslator();
124            }
125    
126            public Object evaluate( String expression, Class<?> type )
127                throws ExpressionEvaluationException
128            {
129                if ( preprocessor != null )
130                {
131                    try
132                    {
133                        return preprocessor.preprocessValue( expression, type );
134                    }
135                    catch ( BeanConfigurationException e )
136                    {
137                        throw new ExpressionEvaluationException( e.getMessage(), e );
138                    }
139                }
140                return expression;
141            }
142    
143            public Object evaluate( String expression )
144                throws ExpressionEvaluationException
145            {
146                return evaluate( expression, null );
147            }
148    
149            public File alignToBaseDirectory( File file )
150            {
151                if ( translator != null )
152                {
153                    return translator.translatePath( file );
154                }
155                return file;
156            }
157    
158        }
159    
160    }