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/*****************************************************************************
* Java Plug-in Framework (JPF)
* Copyright (C) 2004-2007 Dmitry Olshansky
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*****************************************************************************/
package org.java.plugin.standard;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.java.plugin.ObjectFactory;
import org.java.plugin.PathResolver;
import org.java.plugin.PluginManager;
import org.java.plugin.registry.PluginRegistry;
import org.java.plugin.util.ExtendedProperties;
/**
* Standard object factory implementation.
* @version $Id$
*/
public class StandardObjectFactory extends ObjectFactory {
static final String PACKAGE_NAME = "org.java.plugin.standard"; //$NON-NLS-1$
protected Log log = LogFactory.getLog(getClass());
protected ExtendedProperties config;
/**
* @see org.java.plugin.ObjectFactory#configure(ExtendedProperties)
*/
@Override
protected void configure(final ExtendedProperties configuration) {
config = (configuration != null) ? configuration
: new ExtendedProperties();
}
protected String getImplClassName(final Class<?> cls) {
String result = config.getProperty(cls.getName(), null);
if (log.isDebugEnabled()) {
log.debug("implementation class for " + cls.getName() //$NON-NLS-1$
+ " is " + result); //$NON-NLS-1$
}
return result;
}
protected Object createClassInstance(final String className)
throws InstantiationException, IllegalAccessException,
ClassNotFoundException {
ClassLoader cl = Thread.currentThread().getContextClassLoader();
if (cl != null) {
try {
return cl.loadClass(className).newInstance();
} catch (ClassNotFoundException cnfe) {
// ignore
}
}
cl = getClass().getClassLoader();
if (cl != null) {
try {
return cl.loadClass(className).newInstance();
} catch (ClassNotFoundException cnfe) {
// ignore
}
}
return ClassLoader.getSystemClassLoader().loadClass(
className).newInstance();
}
/**
* @see org.java.plugin.ObjectFactory#createRegistry()
*/
@Override
public PluginRegistry createRegistry() {
String className = getImplClassName(PluginRegistry.class);
PluginRegistry result;
if (className == null) {
className = "org.java.plugin.registry.xml.PluginRegistryImpl"; //$NON-NLS-1$
}
try {
result = (PluginRegistry) createClassInstance(className);
} catch (Exception e) {
log.fatal("failed creating registry instance " //$NON-NLS-1$
+ className, e);
throw new Error("failed creating registry instance " //$NON-NLS-1$
+ className, e);
}
result.configure(config.getSubset(className + ".")); //$NON-NLS-1$
log.debug("registry instance created - " + result); //$NON-NLS-1$
return result;
}
/**
* @see org.java.plugin.ObjectFactory#createPathResolver()
*/
@Override
public PathResolver createPathResolver() {
String className = getImplClassName(PathResolver.class);
PathResolver result;
if (className == null) {
className = "org.java.plugin.standard.StandardPathResolver"; //$NON-NLS-1$
}
try {
result = (PathResolver) createClassInstance(className);
} catch (Exception e) {
log.fatal("failed creating path resolver instance " //$NON-NLS-1$
+ className, e);
throw new Error("failed creating path resolver instance " //$NON-NLS-1$
+ className, e);
}
try {
result.configure(config.getSubset(className + ".")); //$NON-NLS-1$
} catch (Exception e) {
log.fatal("failed configuring path resolver instance " //$NON-NLS-1$
+ result, e);
throw new Error("failed configuring path resolver instance " //$NON-NLS-1$
+ result, e);
}
log.debug("path resolver instance created - " + result); //$NON-NLS-1$
return result;
}
/**
* Creates new instance of plug-in life cycle handler implementation class
* using standard discovery algorithm to determine which handler
* implementation class should be instantiated.
* @return new plug-in life cycle handler instance
*/
protected PluginLifecycleHandler createLifecycleHandler() {
String className = getImplClassName(PluginLifecycleHandler.class);
PluginLifecycleHandler result;
if (className == null) {
className =
"org.java.plugin.standard.StandardPluginLifecycleHandler"; //$NON-NLS-1$
}
try {
result = (PluginLifecycleHandler) createClassInstance(className);
} catch (Exception e) {
log.fatal("failed creating plug-in life cycle handler instance " //$NON-NLS-1$
+ className, e);
throw new Error(
"failed creating plug-in life cycle handler instance " //$NON-NLS-1$
+ className, e);
}
result.configure(config.getSubset(className + ".")); //$NON-NLS-1$
log.debug("life cycle handler instance created - " + result); //$NON-NLS-1$
return result;
}
/**
* @see org.java.plugin.ObjectFactory#createManager(
* org.java.plugin.registry.PluginRegistry,
* org.java.plugin.PathResolver)
*/
@Override
public PluginManager createManager(final PluginRegistry registry,
final PathResolver pathResolver) {
return new StandardPluginManager(registry, pathResolver,
createLifecycleHandler());
}
}
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