001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     *
010     *   http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing,
013     * software distributed under the License is distributed on an
014     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     * KIND, either express or implied.  See the License for the
016     * specific language governing permissions and limitations
017     * under the License.
018     */
019    package org.apache.fulcrum.yaafi.framework.configuration;
020    
021    import java.util.Properties;
022    
023    /**
024     * A implementation to provide out-of-the-box component configuration properties
025     * using the following algorithm:
026     *
027     * <ul>
028     *   <li>add the user-supplied defaults to the result<li>
029     *       <li>add the system properties to the result<li>
030     *       <li>add the Merlin context entries to the result<li>
031     * </ul>
032     *
033     * @author <a href="mailto:siegfried.goeschl@it20one.at">Siegfried Goeschl</a>
034     */
035    public class ComponentConfigurationPropertiesResolverImpl
036            extends ComponentConfigurationPropertiesResolverBaseImpl
037    {
038        /**
039         * @see org.apache.fulcrum.yaafi.framework.configuration.ComponentConfigurationPropertiesResolver#resolve(java.util.Properties)
040         */
041        public Properties resolve(Properties defaults) throws Exception
042        {
043            String location = this.getLocation();
044            Properties result = this.loadProperties(location);
045    
046            if(defaults != null)
047            {
048                result.putAll(defaults);
049            }
050    
051            result.putAll(System.getProperties());
052            this.addAvalonContext(result);
053    
054            return result;
055        }
056    }