/* | |
* 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.myfaces.extensions.validator.util; | |
import org.apache.myfaces.extensions.validator.internal.UsageInformation; | |
import org.apache.myfaces.extensions.validator.internal.UsageCategory; | |
import java.util.jar.Manifest; | |
import java.util.jar.Attributes; | |
import java.util.logging.Logger; | |
import java.util.logging.Level; | |
import java.net.URL; | |
/** | |
* @since 1.x.1 | |
*/ | |
@UsageInformation(UsageCategory.INTERNAL) | |
public class ClassUtils | |
{ | |
private static final Logger LOG = Logger.getLogger(ClassUtils.class.getName()); | |
public static Class tryToLoadClassForName(String name) | |
{ | |
try | |
{ | |
return loadClassForName(name); | |
} | |
catch (ClassNotFoundException e) | |
{ | |
//do nothing - it's just a try | |
return null; | |
} | |
} | |
public static Class loadClassForName(String name) throws ClassNotFoundException | |
{ | |
try | |
{ | |
// Try WebApp ClassLoader first | |
return Class.forName(name, false, // do not initialize for faster startup | |
Thread.currentThread().getContextClassLoader()); | |
} | |
catch (ClassNotFoundException ignore) | |
{ | |
// fallback: Try ClassLoader for ClassUtils (i.e. the myfaces.jar lib) | |
return Class.forName(name, false, // do not initialize for faster startup | |
ClassUtils.class.getClassLoader()); | |
} | |
} | |
public static <T> T tryToInstantiateClass(Class<T> targetClass) | |
{ | |
try | |
{ | |
return targetClass.newInstance(); | |
} | |
catch (Exception e) | |
{ | |
//do nothing - it was just a try | |
} | |
return null; | |
} | |
public static Object tryToInstantiateClassForName(String className) | |
{ | |
try | |
{ | |
return instantiateClassForName(className); | |
} | |
catch (Exception e) | |
{ | |
//do nothing - it was just a try | |
} | |
return null; | |
} | |
public static Object instantiateClassForName(String className) | |
throws ClassNotFoundException, IllegalAccessException, InstantiationException | |
{ | |
return loadClassForName(className).newInstance(); | |
} | |
public static String getJarVersion(Class targetClass) | |
{ | |
String classFilePath = targetClass.getCanonicalName().replace('.', '/') + ".class"; | |
String manifestFilePath = "/META-INF/MANIFEST.MF"; | |
String classLocation = targetClass.getResource(targetClass.getSimpleName() + ".class").toString(); | |
String manifestFileLocation = classLocation | |
.substring(0, classLocation.indexOf(classFilePath) - 1) + manifestFilePath; | |
try | |
{ | |
return new Manifest(new URL(manifestFileLocation).openStream()) | |
.getMainAttributes().getValue(Attributes.Name.IMPLEMENTATION_VERSION); | |
} | |
catch (Exception e) | |
{ | |
LOG.log(Level.FINEST, "couldn't load version of jar file which contains " + targetClass.getName(), e); | |
return null; | |
} | |
} | |
/** | |
* Gets the package name. | |
* Needed for ClassLoaderTestSuite | |
* | |
* @param targetClass the the class | |
* @return the package name | |
*/ | |
public static String getPackageName(Class targetClass) | |
{ | |
Package currentPackage = targetClass.getPackage(); | |
if(currentPackage != null) | |
{ | |
return currentPackage.getName(); | |
} | |
return targetClass.getName().substring(0, targetClass.getName().lastIndexOf(".")); | |
} | |
} |