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/* FROM mail.jar */
package org.jvnet.mimepull;
import java.util.*;
/**
* Utilities to make it easier to get property values.
* Properties can be strings or type-specific value objects.
*
* @author Bill Shannon
*/
final class PropUtil {
// No one should instantiate this class.
private PropUtil() {
}
/**
* Get a boolean valued System property.
*/
public static boolean getBooleanSystemProperty(String name, boolean def) {
try {
return getBoolean(getProp(System.getProperties(), name), def);
} catch (SecurityException sex) {
// fall through...
}
/*
* If we can't get the entire System Properties object because
* of a SecurityException, just ask for the specific property.
*/
try {
String value = System.getProperty(name);
if (value == null) {
return def;
}
if (def) {
return !value.equalsIgnoreCase("false");
} else {
return value.equalsIgnoreCase("true");
}
} catch (SecurityException sex) {
return def;
}
}
/**
* Get the value of the specified property.
* If the "get" method returns null, use the getProperty method,
* which might cascade to a default Properties object.
*/
private static Object getProp(Properties props, String name) {
Object val = props.get(name);
if (val != null) {
return val;
} else {
return props.getProperty(name);
}
}
/**
* Interpret the value object as a boolean,
* returning def if unable.
*/
private static boolean getBoolean(Object value, boolean def) {
if (value == null) {
return def;
}
if (value instanceof String) {
/*
* If the default is true, only "false" turns it off.
* If the default is false, only "true" turns it on.
*/
if (def) {
return !((String)value).equalsIgnoreCase("false");
} else {
return ((String)value).equalsIgnoreCase("true");
}
}
if (value instanceof Boolean) {
return ((Boolean)value).booleanValue();
}
return def;
}
}