001package 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
022import java.io.File;
023
024import org.apache.maven.configuration.BeanConfigurationException;
025import org.apache.maven.configuration.BeanConfigurationPathTranslator;
026import org.apache.maven.configuration.BeanConfigurationRequest;
027import org.apache.maven.configuration.BeanConfigurationValuePreprocessor;
028import org.apache.maven.configuration.BeanConfigurator;
029import org.codehaus.plexus.component.annotations.Component;
030import org.codehaus.plexus.component.configurator.ComponentConfigurationException;
031import org.codehaus.plexus.component.configurator.converters.composite.ObjectWithFieldsConverter;
032import org.codehaus.plexus.component.configurator.converters.lookup.ConverterLookup;
033import org.codehaus.plexus.component.configurator.converters.lookup.DefaultConverterLookup;
034import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluationException;
035import org.codehaus.plexus.component.configurator.expression.TypeAwareExpressionEvaluator;
036import org.codehaus.plexus.configuration.PlexusConfiguration;
037import org.codehaus.plexus.configuration.xml.XmlPlexusConfiguration;
038import 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 )
047public 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;
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}