com.carrotsearch.console.jcommander.defaultprovider.PropertyFileDefaultProvider Maven / Gradle / Ivy
/*
* console-tools
*
* Copyright (C) 2019, Carrot Search s.c.
* All rights reserved.
*/
package com.carrotsearch.console.jcommander.defaultprovider;
import com.carrotsearch.console.jcommander.IDefaultProvider;
import com.carrotsearch.console.jcommander.ParameterException;
import java.io.IOException;
import java.net.URL;
import java.util.Properties;
/**
* A default provider that reads its default values from a property file.
*
* @author cbeust
*/
public class PropertyFileDefaultProvider implements IDefaultProvider {
public static final String DEFAULT_FILE_NAME = "jcommander.properties";
private Properties m_properties;
public PropertyFileDefaultProvider() {
init(DEFAULT_FILE_NAME);
}
public PropertyFileDefaultProvider(String fileName) {
init(fileName);
}
private void init(String fileName) {
try {
m_properties = new Properties();
URL url = ClassLoader.getSystemResource(fileName);
if (url != null) {
m_properties.load(url.openStream());
} else {
throw new ParameterException(
"Could not find property file: " + fileName + " on the class path");
}
} catch (IOException e) {
throw new ParameterException("Could not open property file: " + fileName);
}
}
public String getDefaultValueFor(String optionName) {
int index = 0;
while (index < optionName.length() && !Character.isLetterOrDigit(optionName.charAt(index))) {
index++;
}
String key = optionName.substring(index);
return m_properties.getProperty(key);
}
}