ComponentConfigurationPropertiesResolverImpl.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.fulcrum.yaafi.framework.configuration;

import java.util.Properties;

/**
 * A implementation to provide out-of-the-box component configuration properties
 * using the following algorithm:
 *
 * <ul>
 *   <li>add the user-supplied defaults to the result<li>
 * 	 <li>add the system properties to the result<li>
 * 	 <li>add the Merlin context entries to the result<li>
 * </ul>
 *
 * @author <a href="mailto:siegfried.goeschl@it20one.at">Siegfried Goeschl</a>
 */
public class ComponentConfigurationPropertiesResolverImpl
	extends ComponentConfigurationPropertiesResolverBaseImpl
{
    /**
     * @see org.apache.fulcrum.yaafi.framework.configuration.ComponentConfigurationPropertiesResolver#resolve(java.util.Properties)
     */
    public Properties resolve(Properties defaults) throws Exception
    {
        String location = this.getLocation();
        Properties result = this.loadProperties(location);

        if(defaults != null)
        {
            result.putAll(defaults);
        }

        result.putAll(System.getProperties());
        this.addAvalonContext(result);

        return result;
    }
}