org.onebusaway.nyc.presentation.impl.NycConfigurationServiceImpl.java Source code

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Here is the source code for org.onebusaway.nyc.presentation.impl.NycConfigurationServiceImpl.java

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/**
 * Copyright (c) 2011 Metropolitan Transportation Authority
 *
 * 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.onebusaway.nyc.presentation.impl;

import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.lang.reflect.Method;
import java.util.Properties;

import javax.annotation.PostConstruct;

import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.beanutils.Converter;
import org.onebusaway.nyc.transit_data.services.VehicleTrackingManagementService;
import org.onebusaway.nyc.presentation.service.ConfigurationBean;
import org.onebusaway.nyc.presentation.service.NycConfigurationService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class NycConfigurationServiceImpl implements NycConfigurationService {

    private VehicleTrackingManagementService _vehicleTrackingManagementService;

    private File _path;

    private ConfigurationBean _config = new ConfigurationBean();

    private volatile String _agencyId;

    public void setPath(File path) {
        _path = path;
    }

    @Autowired
    public void setVehicleTrackingManagementService(
            VehicleTrackingManagementService vehicleTrackingManagementService) {
        _vehicleTrackingManagementService = vehicleTrackingManagementService;
    }

    @PostConstruct
    public void setup() {
        _config = loadSettings();
    }

    /****
     * {@link NycConfigurationService} Interface
     ****/

    public String getDefaultAgencyId() {
        if (_agencyId == null) {
            synchronized (this) {
                if (_agencyId == null)
                    _agencyId = _vehicleTrackingManagementService.getDefaultAgencyId();
            }
        }
        return _agencyId;
    }

    @Override
    public ConfigurationBean getConfiguration() {
        return new ConfigurationBean(_config);
    }

    @Override
    public void setConfiguration(ConfigurationBean configuration) {
        _config = new ConfigurationBean(configuration);
        notifySettings();
        saveSettings(_config);
    }

    /****
     * Private Methods
     ****/

    private void notifySettings() {
        _vehicleTrackingManagementService.setVehicleOffRouteDistanceThreshold(_config.getOffRouteDistance());
        _vehicleTrackingManagementService.setVehicleStalledTimeThreshold(_config.getNoProgressTimeout());
    }

    private ConfigurationBean loadSettings() {

        if (_path == null || !_path.exists())
            return new ConfigurationBean();

        try {

            Properties properties = new Properties();
            properties.load(new FileReader(_path));

            ConfigurationBean bean = new ConfigurationBean();
            BeanInfo beanInfo = Introspector.getBeanInfo(ConfigurationBean.class);

            for (PropertyDescriptor desc : beanInfo.getPropertyDescriptors()) {
                String name = desc.getName();
                Object value = properties.getProperty(name);
                if (value != null) {
                    Converter converter = ConvertUtils.lookup(desc.getPropertyType());
                    value = converter.convert(desc.getPropertyType(), value);
                    Method m = desc.getWriteMethod();
                    m.invoke(bean, value);
                }
            }

            return bean;
        } catch (Exception ex) {
            throw new IllegalStateException("error loading configuration from properties file " + _path, ex);
        }
    }

    private void saveSettings(ConfigurationBean bean) {

        if (_path == null)
            return;

        try {

            Properties properties = new Properties();
            BeanInfo beanInfo = Introspector.getBeanInfo(ConfigurationBean.class);

            for (PropertyDescriptor desc : beanInfo.getPropertyDescriptors()) {

                String name = desc.getName();

                if (name.equals("class"))
                    continue;

                Method m = desc.getReadMethod();
                Object value = m.invoke(bean);
                if (value != null) {
                    properties.setProperty(name, value.toString());
                }
            }

            properties.store(new FileWriter(_path), "onebusaway-nyc configuration");
        } catch (Exception ex) {
            throw new IllegalStateException("error saving configuration to properties file " + _path, ex);
        }
    }
}