uk.ac.ox.it.ords.api.statistics.configuration.MetaConfiguration.java Source code

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Here is the source code for uk.ac.ox.it.ords.api.statistics.configuration.MetaConfiguration.java

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/*
 * Copyright 2015 University of Oxford
 *
 * Licensed 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 uk.ac.ox.it.ords.api.statistics.configuration;

import java.io.File;

import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.DefaultConfigurationBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Local configuration manager
 */
public class MetaConfiguration {

    public static Logger log = LoggerFactory.getLogger(MetaConfiguration.class);

    private static Configuration config;

    private static final String ORDS_CONFIG_FILENAME = "config.xml";

    /**
     * Load meta-configuration
     */
    private static void load() {
        try {
            String ordsConfigurationLocation = "";
            final String ORDS_CONF_DIR = System.getenv("ORDS_CONF_DIR");
            if (ORDS_CONF_DIR != null) {
                ordsConfigurationLocation = ORDS_CONF_DIR + File.separator + ORDS_CONFIG_FILENAME;
            } else {
                ordsConfigurationLocation = ORDS_CONFIG_FILENAME;
            }

            DefaultConfigurationBuilder factory = new DefaultConfigurationBuilder(ordsConfigurationLocation);
            factory.load();
            config = factory.getConfiguration();
        } catch (Exception e) {
            config = null;
            e.printStackTrace();
            log.warn("No server configuration location set; using defaults");
        }
    }

    public static Configuration getConfiguration() {
        if (config == null)
            load();
        return config;
    }
}