pzalejko.iot.hardware.home.core.service.configuration.DefaultConfigurationService.java Source code

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Here is the source code for pzalejko.iot.hardware.home.core.service.configuration.DefaultConfigurationService.java

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/*******************************************************************************
 * Copyright (c) 2015 Pawel Zalejko(p.zalejko@gmail.com).
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Apache License Version 2.0
 * which accompanies this distribution, and is available at
 * http://www.apache.org/licenses/
 *******************************************************************************/

package pzalejko.iot.hardware.home.core.service.configuration;

import static com.google.common.base.Preconditions.checkState;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.text.MessageFormat;
import java.util.Properties;

import javax.annotation.PostConstruct;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import pzalejko.iot.hardware.home.api.config.*;
import pzalejko.iot.hardware.home.core.util.LogMessages;

@Component
public class DefaultConfigurationService implements ConfigurationService {

    private static final Logger LOG = LoggerFactory.getLogger(DefaultConfigurationService.class);

    private static final String CONFIGURATION_DIRECTORY_KEY = "home.core.settings";
    private static final String APP_CONFIG_FILE_NAME = "application.properties";
    private static final String LED_CONFIG_FILE_NAME = "led.properties";
    private static final String MQTT_CONFIG_FILE_NAME = "mqtt.properties";
    private static final String TEMPERATURE_CONFIG_FILE_NAME = "temperature.properties";

    private File confDirectory;

    @PostConstruct
    public void init() {
        final String property = System.getProperty(CONFIGURATION_DIRECTORY_KEY);
        if (property == null) {
            final String msg = MessageFormat.format(LogMessages.CONFIGURATION_DIRECTORY_HAS_NOT_BE_SPECIFIED,
                    CONFIGURATION_DIRECTORY_KEY);
            throw new IllegalStateException(msg);
        }

        final File file = new File(property);
        if (file.isDirectory()) {
            this.confDirectory = file;
            LOG.debug(LogMessages.FOUND_CONFIGURATION_DIRECTORY, file.getAbsoluteFile());
        } else {
            final String msg = MessageFormat.format(LogMessages.PROPERTY_DOES_NOT_POINT_TO_ANY_DIRECTORY,
                    CONFIGURATION_DIRECTORY_KEY);
            throw new IllegalStateException(msg);
        }
    }

    @Override
    public ApplicationConfiguration getApplicationConfiguration() {
        checkState(confDirectory != null,
                MessageFormat.format(LogMessages.APPLICATION_NOT_CONFIGURED, CONFIGURATION_DIRECTORY_KEY));
        return new DefaultApplicationConfiguration(getProperties(APP_CONFIG_FILE_NAME));
    }

    @Override
    public LedConfiguration getLedSettings() {
        checkState(confDirectory != null,
                MessageFormat.format(LogMessages.APPLICATION_NOT_CONFIGURED, CONFIGURATION_DIRECTORY_KEY));
        return new DefaultLedConfiguration(getProperties(LED_CONFIG_FILE_NAME));
    }

    @Override
    public DataSenderConfiguration getMqttConfiguration() {
        checkState(confDirectory != null,
                MessageFormat.format(LogMessages.APPLICATION_NOT_CONFIGURED, CONFIGURATION_DIRECTORY_KEY));
        return new DefaultSenderSettings(getProperties(MQTT_CONFIG_FILE_NAME));
    }

    @Override
    public TemperatureSensorConfiguration getTemperatureConfiguration() {
        checkState(confDirectory != null,
                MessageFormat.format(LogMessages.APPLICATION_NOT_CONFIGURED, CONFIGURATION_DIRECTORY_KEY));
        return new DefaultTemperatureConfiguration(getProperties(TEMPERATURE_CONFIG_FILE_NAME));
    }

    private Properties getProperties(String key) {
        final File file = new File(confDirectory, key);
        checkState(file.exists(), MessageFormat.format(LogMessages.PROPERTY_FILE_IS_MISSING, key));
        return loadProperties(file);
    }

    private Properties loadProperties(File file) {
        final Properties properties = new Properties();
        try (FileInputStream inStream = new FileInputStream(file)) {
            properties.load(inStream);
        } catch (final IOException e) {
            LOG.error(LogMessages.COULD_NOT_LOAD_A_PROPERTY_FILE, e.getMessage(), e);
            throw new IllegalStateException(LogMessages.COULD_NOT_LOAD_CONFIGURATION);
        }
        return properties;
    }

}