com.trivago.mail.pigeon.configuration.Settings.java Source code

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Here is the source code for com.trivago.mail.pigeon.configuration.Settings.java

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/**
 * Copyright (C) 2011-2012 trivago GmbH <mario.mueller@trivago.com>, <christian.krause@trivago.com>
 *
 * 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 com.trivago.mail.pigeon.configuration;

import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.ConfigurationRuntimeException;
import org.apache.commons.configuration.PropertiesConfiguration;

import java.net.URL;

/**
 *
 * @author Mario Mueller mario.mueller@trivago.com
 */
public class Settings {
    private static final org.apache.log4j.Logger log = org.apache.log4j.Logger.getLogger(Settings.class);

    private static Settings instance;

    private Configuration configuration;

    public static Settings create() {
        return create(false);
    }

    public static Settings create(boolean nocache) {
        return create(null, nocache);
    }

    public static Settings create(String fileName, boolean nocache) {
        log.trace("Settings instance requested");
        if (fileName == null && instance != null && !nocache) {
            log.trace("Returning cached instance");
            return instance;
        } else if (fileName == null && instance == null) {
            log.trace("Requesting ENV PIDGEON_CONFIG as path to properties as fileName was null");

            String propertyFileName = System.getenv("PIDGEON_CONFIG");

            if (propertyFileName == null || propertyFileName.equals("")) {
                log.warn(
                        "ENV is empty and no filename was given -> no config properties found! Using configuration.properties");
            }

            URL resource = Thread.currentThread().getContextClassLoader().getResource("configuration.properties");
            propertyFileName = resource.toExternalForm();
            instance = new Settings();

            try {
                instance.setConfiguration(new PropertiesConfiguration(propertyFileName));
            } catch (ConfigurationException e) {
                log.error(e);
                throw new ConfigurationRuntimeException(e);
            }
        } else if (fileName != null && instance == null) {
            log.trace("Requesting file properties from " + fileName);
            instance = new Settings();

            try {
                instance.setConfiguration(new PropertiesConfiguration(fileName));
            } catch (ConfigurationException e) {
                log.error(e);
                throw new ConfigurationRuntimeException(e);
            }
        }
        return instance;
    }

    public Configuration getConfiguration() {
        return configuration;
    }

    public void setConfiguration(Configuration configuration) {
        this.configuration = configuration;
    }
}