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With inspiration from other libraries
/**
* Logback: the reliable, generic, fast and flexible logging framework.
* Copyright (C) 1999-2015, QOS.ch. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation.
*/
package ch.qos.logback.core.util;
import java.lang.reflect.Constructor;
import java.util.Properties;
import ch.qos.logback.core.Context;
import ch.qos.logback.core.CoreConstants;
import ch.qos.logback.core.spi.ContextAware;
import ch.qos.logback.core.spi.PropertyContainer;
import ch.qos.logback.core.spi.ScanException;
import ch.qos.logback.core.subst.NodeToStringTransformer;
/**
* @author Ceki Gulcu
*/
public class OptionHelper {
public static Object instantiateByClassName(String className, Class superClass, Context context) throws IncompatibleClassException,
DynamicClassLoadingException {
ClassLoader classLoader = Loader.getClassLoaderOfObject(context);
return instantiateByClassName(className, superClass, classLoader);
}
public static Object instantiateByClassNameAndParameter(String className, Class superClass, Context context, Class type, Object param)
throws IncompatibleClassException, DynamicClassLoadingException {
ClassLoader classLoader = Loader.getClassLoaderOfObject(context);
return instantiateByClassNameAndParameter(className, superClass, classLoader, type, param);
}
public static Object instantiateByClassName(String className, Class superClass, ClassLoader classLoader) throws IncompatibleClassException,
DynamicClassLoadingException {
return instantiateByClassNameAndParameter(className, superClass, classLoader, null, null);
}
public static Object instantiateByClassNameAndParameter(String className, Class superClass, ClassLoader classLoader, Class type, Object parameter)
throws IncompatibleClassException, DynamicClassLoadingException {
if (className == null) {
throw new NullPointerException();
}
try {
Class classObj = null;
classObj = classLoader.loadClass(className);
if (!superClass.isAssignableFrom(classObj)) {
throw new IncompatibleClassException(superClass, classObj);
}
if (type == null) {
return classObj.newInstance();
} else {
Constructor constructor = classObj.getConstructor(type);
return constructor.newInstance(parameter);
}
} catch (IncompatibleClassException ice) {
throw ice;
} catch (Throwable t) {
throw new DynamicClassLoadingException("Failed to instantiate type " + className, t);
}
}
/**
* Find the value corresponding to key in props.
* Then perform variable substitution on the found value.
*/
// public static String findAndSubst(String key, Properties props) {
// String value = props.getProperty(key);
//
// if (value == null) {
// return null;
// }
//
// try {
// return substVars(value, props);
// } catch (IllegalArgumentException e) {
// return value;
// }
// }
final static String DELIM_START = "${";
final static char DELIM_STOP = '}';
final static String DELIM_DEFAULT = ":-";
final static int DELIM_START_LEN = 2;
final static int DELIM_STOP_LEN = 1;
final static int DELIM_DEFAULT_LEN = 2;
final static String _IS_UNDEFINED = "_IS_UNDEFINED";
/**
* @see #substVars(String, PropertyContainer, PropertyContainer)
*/
public static String substVars(String val, PropertyContainer pc1) {
return substVars(val, pc1, null);
}
/**
* See http://logback.qos.ch/manual/configuration.html#variableSubstitution
*/
public static String substVars(String input, PropertyContainer pc0, PropertyContainer pc1) {
try {
return NodeToStringTransformer.substituteVariable(input, pc0, pc1);
} catch (ScanException e) {
throw new IllegalArgumentException("Failed to parse input [" + input + "]", e);
}
}
public static String propertyLookup(String key, PropertyContainer pc1, PropertyContainer pc2) {
String value = null;
// first try the props passed as parameter
value = pc1.getProperty(key);
// then try the pc2
if (value == null && pc2 != null) {
value = pc2.getProperty(key);
}
// then try in System properties
if (value == null) {
value = getSystemProperty(key, null);
}
if (value == null) {
value = getEnv(key);
}
return value;
}
/**
* Very similar to System.getProperty except that the
* {@link SecurityException} is absorbed.
*
* @param key The key to search for.
* @param def The default value to return.
* @return the string value of the system property, or the default value if
* there is no property with that key.
*/
public static String getSystemProperty(String key, String def) {
try {
return System.getProperty(key, def);
} catch (SecurityException e) {
return def;
}
}
/**
* Lookup a key from the environment.
*
* @param key
* @return value corresponding to key from the OS environment
*/
public static String getEnv(String key) {
try {
return System.getenv(key);
} catch (SecurityException e) {
return null;
}
}
/**
* Very similar to System.getProperty except that the
* {@link SecurityException} is absorbed.
*
* @param key The key to search for.
* @return the string value of the system property.
*/
public static String getSystemProperty(String key) {
try {
return System.getProperty(key);
} catch (SecurityException e) {
return null;
}
}
public static void setSystemProperties(ContextAware contextAware, Properties props) {
for (Object o : props.keySet()) {
String key = (String) o;
String value = props.getProperty(key);
setSystemProperty(contextAware, key, value);
}
}
public static void setSystemProperty(ContextAware contextAware, String key, String value) {
try {
System.setProperty(key, value);
} catch (SecurityException e) {
contextAware.addError("Failed to set system property [" + key + "]", e);
}
}
/**
* Very similar to {@link System#getProperties()} except that the
* {@link SecurityException} is absorbed.
*
* @return the system properties
*/
public static Properties getSystemProperties() {
try {
return System.getProperties();
} catch (SecurityException e) {
return new Properties();
}
}
/**
* Return a String[] of size two. The first item containing the key part and the second item
* containing a default value specified by the user. The second item will be null if no default value
* is specified.
*
* @param key
* @return
*/
static public String[] extractDefaultReplacement(String key) {
String[] result = new String[2];
if (key == null)
return result;
result[0] = key;
int d = key.indexOf(DELIM_DEFAULT);
if (d != -1) {
result[0] = key.substring(0, d);
result[1] = key.substring(d + DELIM_DEFAULT_LEN);
}
return result;
}
/**
* If value is "true", then true is returned. If
* value is "false", then true is returned.
* Otherwise, default is returned.
*
* Case of value is unimportant.
*/
public static boolean toBoolean(String value, boolean dEfault) {
if (value == null) {
return dEfault;
}
String trimmedVal = value.trim();
if ("true".equalsIgnoreCase(trimmedVal)) {
return true;
}
if ("false".equalsIgnoreCase(trimmedVal)) {
return false;
}
return dEfault;
}
public static boolean isEmpty(String str) {
return ((str == null) || CoreConstants.EMPTY_STRING.equals(str));
}
}