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path: root/src/org/traccar/Config.java
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/*
 * Copyright 2015 - 2016 Anton Tananaev (anton@traccar.org)
 *
 * 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 org.traccar;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class Config {

    private final Properties properties = new Properties();

    private boolean useEnvVars = false;

    void load(String file) throws IOException {
        // First we load default config (if any)
        String defaultConfigFile = properties.getProperty("config.default");
        if (defaultConfigFile != null) {
            try (InputStream inputStream = new FileInputStream(defaultConfigFile)) {
                properties.loadFromXML(inputStream);
            }
        }
        // Then we override by loading <code>file</code>
        try (InputStream inputStream = new FileInputStream(file)) {
            Properties props = new Properties();
            props.loadFromXML(inputStream);
            properties.putAll(props);
        }
        // Environment variables interpolation support
        if ("true".equals(System.getenv("CONFIG_USE_ENV"))) {
            useEnvVars = true;
        } else {
            useEnvVars = properties.getProperty("config.useEnv", "false").equalsIgnoreCase("true");
        }
    }


    public boolean hasKey(String key) {
        if (useEnvVars && System.getenv().containsKey(getEnvVarName(key))) {
            return true;
        }
        return properties.containsKey(key);
    }

    public String getString(String key) {
        if (useEnvVars) {
            String envValue = System.getenv(getEnvVarName(key));
            if (envValue != null && !envValue.isEmpty()) {
                return envValue;
            }
        }
        return properties.getProperty(key);
    }

    public String getString(String key, String defaultValue) {
        return hasKey(key) ? getString(key) : defaultValue;
    }

    public boolean getBoolean(String key) {
        return Boolean.parseBoolean(getString(key));
    }

    public int getInteger(String key) {
        return getInteger(key, 0);
    }

    public int getInteger(String key, int defaultValue) {
        return hasKey(key) ? Integer.parseInt(getString(key)) : defaultValue;
    }

    public long getLong(String key) {
        return getLong(key, 0);
    }

    public long getLong(String key, long defaultValue) {
        return hasKey(key) ? Long.parseLong(getString(key)) : defaultValue;
    }

    public double getDouble(String key) {
        return getDouble(key, 0.0);
    }

    public double getDouble(String key, double defaultValue) {
        return hasKey(key) ? Double.parseDouble(getString(key)) : defaultValue;
    }

    public static String getEnvVarName(String key) {
        return key.replaceAll("\\.", "_").replaceAll("(.)(\\p{Lu})", "$1_$2").toUpperCase();
    }

}