org.apache.log4j.helpers.OptionConverter Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.log4j.helpers;
import java.util.Properties;
import java.net.URL;
import java.io.InterruptedIOException;
import org.apache.log4j.Level;
import org.apache.log4j.spi.Configurator;
import org.apache.log4j.spi.LoggerRepository;
import org.apache.log4j.PropertyConfigurator;
// Contributors: Avy Sharell ([email protected])
// Matthieu Verbert ([email protected])
// Colin Sampaleanu
/**
A convenience class to convert property values to specific types.
@author Ceki Gülcü
@author Simon Kitching;
@author Anders Kristensen
*/
public class OptionConverter {
static String DELIM_START = "${";
static char DELIM_STOP = '}';
static int DELIM_START_LEN = 2;
static int DELIM_STOP_LEN = 1;
/** OptionConverter is a static class. */
private OptionConverter() {}
public
static
String[] concatanateArrays(String[] l, String[] r) {
int len = l.length + r.length;
String[] a = new String[len];
System.arraycopy(l, 0, a, 0, l.length);
System.arraycopy(r, 0, a, l.length, r.length);
return a;
}
public
static
String convertSpecialChars(String s) {
char c;
int len = s.length();
StringBuffer sbuf = new StringBuffer(len);
int i = 0;
while(i < len) {
c = s.charAt(i++);
if (c == '\\') {
c = s.charAt(i++);
if(c == 'n') c = '\n';
else if(c == 'r') c = '\r';
else if(c == 't') c = '\t';
else if(c == 'f') c = '\f';
else if(c == '\b') c = '\b';
else if(c == '\"') c = '\"';
else if(c == '\'') c = '\'';
else if(c == '\\') c = '\\';
}
sbuf.append(c);
}
return sbuf.toString();
}
/**
Very similar to System.getProperty except
that the {@link SecurityException} is hidden.
@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.
@since 1.1 */
public
static
String getSystemProperty(String key, String def) {
try {
return System.getProperty(key, def);
} catch(Throwable e) { // MS-Java throws com.ms.security.SecurityExceptionEx
LogLog.debug("Was not allowed to read system property \""+key+"\".");
return def;
}
}
public
static
Object instantiateByKey(Properties props, String key, Class superClass,
Object defaultValue) {
// Get the value of the property in string form
String className = findAndSubst(key, props);
if(className == null) {
LogLog.error("Could not find value for key " + key);
return defaultValue;
}
// Trim className to avoid trailing spaces that cause problems.
return OptionConverter.instantiateByClassName(className.trim(), superClass,
defaultValue);
}
/**
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
int toInt(String value, int dEfault) {
if(value != null) {
String s = value.trim();
try {
return Integer.valueOf(s).intValue();
}
catch (NumberFormatException e) {
LogLog.error("[" + s + "] is not in proper int form.");
e.printStackTrace();
}
}
return dEfault;
}
/**
Converts a standard or custom priority level to a Level
object.
If value is of form
"level#classname", then the specified class' toLevel method
is called to process the specified level string; if no '#'
character is present, then the default {@link org.apache.log4j.Level}
class is used to process the level value.
As a special case, if the value parameter is
equal to the string "NULL", then the value null will
be returned.
If any error occurs while converting the value to a level,
the defaultValue parameter, which may be
null, is returned.
Case of value is insignificant for the level level, but is
significant for the class name part, if present.
@since 1.1 */
public
static
Level toLevel(String value, Level defaultValue) {
if(value == null)
return defaultValue;
value = value.trim();
int hashIndex = value.indexOf('#');
if (hashIndex == -1) {
if("NULL".equalsIgnoreCase(value)) {
return null;
} else {
// no class name specified : use standard Level class
return(Level) Level.toLevel(value, defaultValue);
}
}
Level result = defaultValue;
String clazz = value.substring(hashIndex+1);
String levelName = value.substring(0, hashIndex);
// This is degenerate case but you never know.
if("NULL".equalsIgnoreCase(levelName)) {
return null;
}
LogLog.debug("toLevel" + ":class=[" + clazz + "]"
+ ":pri=[" + levelName + "]");
try {
Class customLevel = Loader.loadClass(clazz);
// get a ref to the specified class' static method
// toLevel(String, org.apache.log4j.Level)
Class[] paramTypes = new Class[] { String.class,
org.apache.log4j.Level.class
};
java.lang.reflect.Method toLevelMethod =
customLevel.getMethod("toLevel", paramTypes);
// now call the toLevel method, passing level string + default
Object[] params = new Object[] {levelName, defaultValue};
Object o = toLevelMethod.invoke(null, params);
result = (Level) o;
} catch(ClassNotFoundException e) {
LogLog.warn("custom level class [" + clazz + "] not found.");
} catch(NoSuchMethodException e) {
LogLog.warn("custom level class [" + clazz + "]"
+ " does not have a class function toLevel(String, Level)", e);
} catch(java.lang.reflect.InvocationTargetException e) {
if (e.getTargetException() instanceof InterruptedException
|| e.getTargetException() instanceof InterruptedIOException) {
Thread.currentThread().interrupt();
}
LogLog.warn("custom level class [" + clazz + "]"
+ " could not be instantiated", e);
} catch(ClassCastException e) {
LogLog.warn("class [" + clazz
+ "] is not a subclass of org.apache.log4j.Level", e);
} catch(IllegalAccessException e) {
LogLog.warn("class ["+clazz+
"] cannot be instantiated due to access restrictions", e);
} catch(RuntimeException e) {
LogLog.warn("class ["+clazz+"], level ["+levelName+
"] conversion failed.", e);
}
return result;
}
public
static
long toFileSize(String value, long dEfault) {
if(value == null)
return dEfault;
String s = value.trim().toUpperCase();
long multiplier = 1;
int index;
if((index = s.indexOf("KB")) != -1) {
multiplier = 1024;
s = s.substring(0, index);
}
else if((index = s.indexOf("MB")) != -1) {
multiplier = 1024*1024;
s = s.substring(0, index);
}
else if((index = s.indexOf("GB")) != -1) {
multiplier = 1024*1024*1024;
s = s.substring(0, index);
}
if(s != null) {
try {
return Long.valueOf(s).longValue() * multiplier;
}
catch (NumberFormatException e) {
LogLog.error("[" + s + "] is not in proper int form.");
LogLog.error("[" + value + "] not in expected format.", e);
}
}
return dEfault;
}
/**
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) {
LogLog.error("Bad option value ["+value+"].", e);
return value;
}
}
/**
Instantiate an object given a class name. Check that the
className is a subclass of
superClass. If that test fails or the object could
not be instantiated, then defaultValue is returned.
@param className The fully qualified class name of the object to instantiate.
@param superClass The class to which the new object should belong.
@param defaultValue The object to return in case of non-fulfillment
*/
public
static
Object instantiateByClassName(String className, Class superClass,
Object defaultValue) {
if(className != null) {
try {
Class classObj = Loader.loadClass(className);
if(!superClass.isAssignableFrom(classObj)) {
LogLog.error("A \""+className+"\" object is not assignable to a \""+
superClass.getName() + "\" variable.");
LogLog.error("The class \""+ superClass.getName()+"\" was loaded by ");
LogLog.error("["+superClass.getClassLoader()+"] whereas object of type ");
LogLog.error("\"" +classObj.getName()+"\" was loaded by ["
+classObj.getClassLoader()+"].");
return defaultValue;
}
return classObj.newInstance();
} catch (ClassNotFoundException e) {
LogLog.error("Could not instantiate class [" + className + "].", e);
} catch (IllegalAccessException e) {
LogLog.error("Could not instantiate class [" + className + "].", e);
} catch (InstantiationException e) {
LogLog.error("Could not instantiate class [" + className + "].", e);
} catch (RuntimeException e) {
LogLog.error("Could not instantiate class [" + className + "].", e);
}
}
return defaultValue;
}
/**
Perform variable substitution in string val from the
values of keys found in the system propeties.
The variable substitution delimeters are ${ and }.
For example, if the System properties contains "key=value", then
the call
String s = OptionConverter.substituteVars("Value of key is ${key}.");
will set the variable s to "Value of key is value.".
If no value could be found for the specified key, then the
props parameter is searched, if the value could not
be found there, then substitution defaults to the empty string.
For example, if system propeties contains no value for the key
"inexistentKey", then the call
String s = OptionConverter.subsVars("Value of inexistentKey is [${inexistentKey}]");
will set s to "Value of inexistentKey is []"
An {@link java.lang.IllegalArgumentException} is thrown if
val contains a start delimeter "${" which is not
balanced by a stop delimeter "}".
Author Avy Sharell
@param val The string on which variable substitution is performed.
@throws IllegalArgumentException if val is malformed.
*/
public static
String substVars(String val, Properties props) throws
IllegalArgumentException {
StringBuffer sbuf = new StringBuffer();
int i = 0;
int j, k;
while(true) {
j=val.indexOf(DELIM_START, i);
if(j == -1) {
// no more variables
if(i==0) { // this is a simple string
return val;
} else { // add the tail string which contails no variables and return the result.
sbuf.append(val.substring(i, val.length()));
return sbuf.toString();
}
} else {
sbuf.append(val.substring(i, j));
k = val.indexOf(DELIM_STOP, j);
if(k == -1) {
throw new IllegalArgumentException('"'+val+
"\" has no closing brace. Opening brace at position " + j
+ '.');
} else {
j += DELIM_START_LEN;
String key = val.substring(j, k);
// first try in System properties
String replacement = getSystemProperty(key, null);
// then try props parameter
if(replacement == null && props != null) {
replacement = props.getProperty(key);
}
if(replacement != null) {
// Do variable substitution on the replacement string
// such that we can solve "Hello ${x2}" as "Hello p1"
// the where the properties are
// x1=p1
// x2=${x1}
String recursiveReplacement = substVars(replacement, props);
sbuf.append(recursiveReplacement);
}
i = k + DELIM_STOP_LEN;
}
}
}
}
/**
Configure log4j given a URL.
The url must point to a file or resource which will be interpreted by
a new instance of a log4j configurator.
All configurations steps are taken on the
hierarchy passed as a parameter.
@param url The location of the configuration file or resource.
@param clazz The classname, of the log4j configurator which will parse
the file or resource at url. This must be a subclass of
{@link Configurator}, or null. If this value is null then a default
configurator of {@link PropertyConfigurator} is used, unless the
filename pointed to by url ends in '.xml', in which case
{@link org.apache.log4j.xml.DOMConfigurator} is used.
@param hierarchy The {@link org.apache.log4j.Hierarchy} to act on.
@since 1.1.4 */
static
public
void selectAndConfigure(URL url, String clazz, LoggerRepository hierarchy) {
Configurator configurator = null;
String filename = url.getFile();
if(clazz == null && filename != null && filename.endsWith(".xml")) {
clazz = "org.apache.log4j.xml.DOMConfigurator";
}
if(clazz != null) {
LogLog.debug("Preferred configurator class: " + clazz);
configurator = (Configurator) instantiateByClassName(clazz,
Configurator.class,
null);
if(configurator == null) {
LogLog.error("Could not instantiate configurator ["+clazz+"].");
return;
}
} else {
configurator = new PropertyConfigurator();
}
configurator.doConfigure(url, hierarchy);
}
}