fi.jumi.core.config.SystemProperty Maven / Gradle / Ivy
// Copyright © 2011-2013, Esko Luontola
// This software is released under the Apache License 2.0.
// The license text is at http://www.apache.org/licenses/LICENSE-2.0
package fi.jumi.core.config;
import javax.annotation.concurrent.Immutable;
import java.lang.reflect.Method;
import java.util.Properties;
@Immutable
class SystemProperty {
// TODO: make generic and decouple from DaemonConfiguration?
private final String systemProperty;
private final DaemonConfiguration defaults;
private final Method getter;
private final Method setter;
private final Class type;
public SystemProperty(String beanProperty, String systemProperty, DaemonConfiguration defaults) {
this.systemProperty = systemProperty;
this.defaults = defaults;
try {
getter = DaemonConfiguration.class.getMethod(getterName(beanProperty));
type = getter.getReturnType();
setter = DaemonConfigurationBuilder.class.getMethod(setterName(beanProperty), type);
} catch (NoSuchMethodException e) {
throw new RuntimeException(e);
}
}
public void toSystemProperty(DaemonConfiguration source, Properties target) {
Object value = get(source);
Object defaultValue = get(defaults);
if (!value.equals(defaultValue)) {
target.setProperty(systemProperty, String.valueOf(value));
}
}
public void parseSystemProperty(DaemonConfigurationBuilder target, Properties source) {
String value = source.getProperty(systemProperty);
if (value != null) {
set(target, value);
}
}
private Object get(DaemonConfiguration source) {
try {
return getter.invoke(source);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private void set(DaemonConfigurationBuilder target, String value) {
try {
setter.invoke(target, parse(type, value));
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private static Object parse(Class type, String value) {
if (type == int.class) {
return Integer.parseInt(value);
}
if (type == long.class) {
return Long.parseLong(value);
}
if (type == boolean.class) {
return Boolean.parseBoolean(value);
}
throw new IllegalArgumentException("unsupported type: " + type);
}
private static String getterName(String beanProperty) {
return "get" + capitalize(beanProperty);
}
private static String setterName(String beanProperty) {
return "set" + capitalize(beanProperty);
}
private static String capitalize(String s) {
return s.substring(0, 1).toUpperCase() + s.substring(1);
}
}