eu.larkc.csparql.common.config.Config.java Source code

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Here is the source code for eu.larkc.csparql.common.config.Config.java

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/**
 * Copyright 2011-2015 DEIB - Politecnico di Milano
 *
 * 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.
 *
 * Acknowledgements:
 * We would like to thank Davide Barbieri, Emanuele Della Valle,
 * Marco Balduini, Soheila Dehghanzadeh, Shen Gao, and
 * Daniele Dell'Aglio for the effort in the development of the software.
 *
 * This work is partially supported by
 * - the European LarKC project (FP7-215535) of DEIB, Politecnico di
 * Milano
 * - the ERC grant Search Computing? awarded to prof. Stefano Ceri
 * - the European ModaClouds project (FP7-ICT-2011-8-318484) of DEIB,
 * Politecnico di Milano
 * - the IBM Faculty Award 2013 grated to prof. Emanuele Della Valle;
 * - the City Data Fusion for Event Management 2013 project funded
 * by EIT Digital of DEIB, Politecnico di Milano
 * - the Dynamic and Distributed Information Systems Group of the
 * University of Zurich;
 * - INSIGHT NUIG and Science Foundation Ireland (SFI) under grant
 * No. SFI/12/RC/2289
 */
package eu.larkc.csparql.common.config;

import java.util.Arrays;
import java.util.List;
import java.util.Map.Entry;
import java.util.Properties;

import org.apache.commons.configuration2.BaseConfiguration;
import org.apache.commons.configuration2.Configuration;
import org.apache.commons.configuration2.FileBasedConfiguration;
import org.apache.commons.configuration2.PropertiesConfiguration;
import org.apache.commons.configuration2.builder.FileBasedConfigurationBuilder;
import org.apache.commons.configuration2.builder.fluent.Parameters;
import org.apache.commons.configuration2.ex.ConfigurationException;
import org.apache.commons.configuration2.io.BasePathLocationStrategy;
import org.apache.commons.configuration2.io.ClasspathLocationStrategy;
import org.apache.commons.configuration2.io.CombinedLocationStrategy;
import org.apache.commons.configuration2.io.FileLocationStrategy;
import org.apache.commons.configuration2.io.FileSystemLocationStrategy;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class Config {
    public static final Config INSTANCE = new Config();

    private final Logger logger = LoggerFactory.getLogger(Config.class);

    private Configuration config;

    private Config() {
        try {
            List<FileLocationStrategy> subs = Arrays.asList(new BasePathLocationStrategy(),
                    new FileSystemLocationStrategy(), new ClasspathLocationStrategy());

            FileLocationStrategy strategy = new CombinedLocationStrategy(subs);

            FileBasedConfigurationBuilder<FileBasedConfiguration> builder = new FileBasedConfigurationBuilder<FileBasedConfiguration>(
                    PropertiesConfiguration.class);
            Parameters params = new Parameters();

            builder.configure(params.fileBased().setFileName("csparql.properties").setLocationStrategy(strategy));

            config = builder.getConfiguration();
            logger.debug("Configuration file successfully lodead");
        } catch (ConfigurationException e) {
            logger.error("Error while lading the configuration file; default config will be used", e);
            config = new BaseConfiguration();
            config.addProperty("esper.externaltime.enabled", false);
            config.addProperty("esper.externaltime.tick", 0);
        }
    }

    public boolean isEsperUsingExternalTimestamp() {
        return config.getBoolean("esper.externaltime.enabled");
    }

    public long getTimeStampTick() {
        return config.getLong("esper.externaltime.tick");
    }

    //mainly for test purposes
    public void setConfigParams(Properties properties) {
        for (Entry<Object, Object> entry : properties.entrySet())
            config.setProperty(entry.getKey().toString(), entry.getValue());
    }

}