com.tdclighthouse.prototype.utils.Configuration.java Source code

Introduction

Here is the source code for com.tdclighthouse.prototype.utils.Configuration.java

Source

/*
 *  Copyright 2012 Finalist 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.tdclighthouse.prototype.utils;

import java.io.IOException;
import java.io.InputStream;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Properties;

import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;

/**
 * @author Ebrahim Aharpour
 * 
 */
public class Configuration {
    private static final String TIME_FORMAT_STRING = "HH:mm";
    private static final Logger LOG = LoggerFactory.getLogger(Configuration.class);
    private final Properties properties;

    public Configuration(Properties properties) {
        this.properties = properties;
    }

    public Configuration(String propertiesName) throws IOException {
        InputStream inStream = Thread.currentThread().getContextClassLoader().getResourceAsStream(propertiesName);
        properties = new Properties();
        properties.load(inStream);
    }

    public Configuration(String systemPropertyName, String defaultPropertiesFileLocation) throws IOException {
        String propertyFilePath = System.getProperties().getProperty(systemPropertyName);
        Resource location = null;
        if (StringUtils.isNotBlank(propertyFilePath)) {
            location = new FileSystemResource(propertyFilePath);
        } else {
            location = new ClassPathResource(defaultPropertiesFileLocation);
        }
        properties = new Properties();
        properties.load(location.getInputStream());
    }

    public String getString(String key, String defaultValue) {
        return properties.getProperty(key, defaultValue);
    }

    public Date getTime(String key, Date defaultValue) {
        Date result = defaultValue;
        String stringDate = properties.getProperty(key);
        try {
            if (StringUtils.isNotBlank(stringDate)) {

                Calendar calendar = new GregorianCalendar();
                calendar.setTime(new SimpleDateFormat(TIME_FORMAT_STRING).parse(stringDate));
                Calendar now = new GregorianCalendar();
                calendar.set(now.get(Calendar.YEAR), now.get(Calendar.MONTH), now.get(Calendar.DAY_OF_MONTH));
                if (calendar.before(now)) {
                    calendar.add(Calendar.DAY_OF_MONTH, 1);
                }
                result = calendar.getTime();
            }
        } catch (ParseException e) {
            LOG.error(
                    "the given value \"{}\" of the key \"{}\" is not of the format \"{}\" so we default back to the default value",
                    stringDate, key, TIME_FORMAT_STRING);
        }
        return result;
    }

    @SuppressWarnings("unchecked")
    public <T> T getItem(String key, T defaultValue, Class<T> clazz) {
        T result = defaultValue;
        String stringValue = properties.getProperty(key);
        Object converted = ConvertUtils.convert(stringValue, clazz);
        if (clazz.isAssignableFrom(converted.getClass())) {
            result = (T) converted;
        } else {
            LOG.error(
                    "the given value \"{}\" of the key \"{}\" is not convertable to {}. So we default back to the default value",
                    stringValue, key, clazz.getSimpleName());
        }
        return result;
    }
}