com.xebialabs.overcast.PropertiesLoader.java Source code

Introduction

Here is the source code for com.xebialabs.overcast.PropertiesLoader.java

Source

/**
 *    Copyright 2012-2015 XebiaLabs B.V.
 *
 *    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.xebialabs.overcast;

import java.io.File;
import java.net.URISyntaxException;

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

import com.google.common.io.Resources;
import com.typesafe.config.Config;
import com.typesafe.config.ConfigFactory;

public class PropertiesLoader {

    private static Logger logger = LoggerFactory.getLogger(PropertiesLoader.class);

    public static final String OVERCAST_CONF_FILE = "overcast.conf";
    public static final String OVERCAST_USER_DIR = ".overcast";
    public static final String OVERCAST_CONF_FILE_PROPERTY = "overcast.conf.file";

    private static String getUserOvercastConfPath() {
        return new File(new File(System.getProperty("user.home"), OVERCAST_USER_DIR), OVERCAST_CONF_FILE)
                .getAbsolutePath();
    }

    public static Config loadOvercastConfig() {
        return ConfigFactory.systemProperties().withFallback(loadOvercastConfigFromFile(getUserOvercastConfPath()))
                .withFallback(loadOvercastConfigFromFile(OVERCAST_CONF_FILE))
                .withFallback(loadOvercastConfigFromFile(System.getProperty(OVERCAST_CONF_FILE_PROPERTY)))
                .withFallback(loadOvercastConfigFromClasspath(OVERCAST_CONF_FILE)).resolve();
    }

    /** Load {@link Config} from 'file' but do not resolve it. */
    static Config loadOvercastConfigFromClasspath(String path) {
        try {
            // resource.toURI().getPath() so path gets URL decoded so spaces are no issue
            // using resource.getPath() runs into a bug with guava
            return loadOvercastConfigFromFile(Resources.getResource(path).toURI().getPath());
        } catch (IllegalArgumentException e) {
            logger.warn("File '{}' not found on classpath.", path);
        } catch (URISyntaxException e) {
            logger.warn("File '{}' not found on classpath.", path);
        }
        return ConfigFactory.empty();
    }

    /** Load {@link Config} from 'file' but do not resolve it. */
    static Config loadOvercastConfigFromFile(String file) {

        if (file == null) {
            return ConfigFactory.empty();
        }

        File f = new File(file);
        if (!f.exists()) {
            logger.warn("File {} not found.", f.getAbsolutePath());
            return ConfigFactory.empty();
        }

        logger.info("Loading from file {}", f.getAbsolutePath());
        return ConfigFactory.parseFile(f);
    }
}