org.openmdx.application.Configuration Maven / Gradle / Ivy
/*
* ====================================================================
* Project: openMDX/Core, http://www.openmdx.org/
* Description: Configuration
* Owner: OMEX AG, Switzerland, http://www.omex.ch
* ====================================================================
*
* This software is published under the BSD license as listed below.
*
* Copyright (c) 2016, OMEX AG, Switzerland
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of the openMDX team nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* ------------------
*
* This product includes software developed by other organizations as
* listed in the NOTICE file.
*/
package org.openmdx.application;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import org.openmdx.kernel.log.SysLog;
/**
* Configuration
*/
public class Configuration {
/**
* Constructor
*/
private Configuration() {
// Avoid instantiation
}
/**
* The lazily loaded configuration
*/
private static Properties configuration;
/**
* The configuration file name
*/
private static final String CONFIGURATION = "configuration.properties";
/**
* The property value has the following sources
* - System Property
*
- Configuration Value
*
*
* @param key the property name or configuration entry
*
* @return the platform specific value
*/
public static String getProperty(
String key
){
String value = System.getProperty(key);
if(value == null) value = getConfiguration().getProperty(key);
return value == null ? null : value.trim();
}
/**
* The property value has the following sources
* - System Property
*
- Configuration Value
*
- Default Value
*
*
* @param key the property name or configuration entry
* @param defaultValue the default value
*
* @return the platform specific value
*/
public static String getProperty(
String key,
String defaultValue
){
String value = Configuration.getProperty(key);
return value == null ? defaultValue : value;
}
private static Properties getConfiguration(
){
if(Configuration.configuration == null) {
Configuration.configuration = loadConfiguration();
}
return Configuration.configuration;
}
private static Properties loadConfiguration(){
final Properties configuration = new Properties();
final InputStream stream = Configuration.class.getResourceAsStream(CONFIGURATION);
if(stream == null) {
SysLog.detail(CONFIGURATION + " missing");
} else {
try {
configuration.load(stream);
} catch (IOException exception) {
SysLog.error(
CONFIGURATION + " processing failure",
exception
);
}
}
return configuration;
}
}