/* $Id: OutputConnectorFactory.java 988245 2010-08-23 18:39:35Z kwright $ */
/**
* 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.manifoldcf.core.interfaces;
import org.apache.manifoldcf.core.system.ManifoldCF;
import java.util.*;
import java.io.*;
import java.lang.reflect.*;
/** This is the base factory class for all IConnector objects.
*/
public abstract class ConnectorFactory<T extends IConnector>
{
public static final String _rcsid = "@(#)$Id: OutputConnectorFactory.java 988245 2010-08-23 18:39:35Z kwright $";
protected ConnectorFactory()
{
}
/** Override this method to hook into a connector manager.
*/
protected abstract boolean isInstalled(IThreadContext tc, String className)
throws ManifoldCFException;
/** Install connector.
*@param className is the class name.
*/
protected void installThis(IThreadContext threadContext, String className)
throws ManifoldCFException
{
T connector = getThisConnectorNoCheck(className);
connector.install(threadContext);
}
/** Uninstall connector.
*@param className is the class name.
*/
protected void deinstallThis(IThreadContext threadContext, String className)
throws ManifoldCFException
{
T connector = getThisConnectorNoCheck(className);
connector.deinstall(threadContext);
}
/** Output the configuration header section.
*/
protected void outputThisConfigurationHeader(IThreadContext threadContext, String className,
IHTTPOutput out, Locale locale, ConfigParams parameters, ArrayList tabsArray)
throws ManifoldCFException, IOException
{
T connector = getThisConnector(threadContext, className);
if (connector == null)
return;
connector.outputConfigurationHeader(threadContext,out,locale,parameters,tabsArray);
}
/** Output the configuration body section.
*/
protected void outputThisConfigurationBody(IThreadContext threadContext, String className,
IHTTPOutput out, Locale locale, ConfigParams parameters, String tabName)
throws ManifoldCFException, IOException
{
T connector = getThisConnector(threadContext, className);
if (connector == null)
return;
connector.outputConfigurationBody(threadContext,out,locale,parameters,tabName);
}
/** Process configuration post data for a connector.
*/
protected String processThisConfigurationPost(IThreadContext threadContext, String className,
IPostParameters variableContext, Locale locale, ConfigParams configParams)
throws ManifoldCFException
{
T connector = getThisConnector(threadContext, className);
if (connector == null)
return null;
return connector.processConfigurationPost(threadContext,variableContext,locale,configParams);
}
/** View connector configuration.
*/
protected void viewThisConfiguration(IThreadContext threadContext, String className,
IHTTPOutput out, Locale locale, ConfigParams configParams)
throws ManifoldCFException, IOException
{
T connector = getThisConnector(threadContext, className);
// We want to be able to view connections even if they have unregistered connectors.
if (connector == null)
return;
connector.viewConfiguration(threadContext,out,locale,configParams);
}
/** Get a connector instance, without checking for installed connector.
*@param className is the class name.
*@return the instance.
*/
protected T getThisConnectorNoCheck(String className)
throws ManifoldCFException
{
T rval = getThisConnectorRaw(className);
if (rval == null)
throw new ManifoldCFException("No connector class '"+className+"' was found.");
return rval;
}
/** Get a connector instance.
*@param className is the class name.
*@return the instance.
*/
protected T getThisConnector(IThreadContext threadContext, String className)
throws ManifoldCFException
{
if (!isInstalled(threadContext,className))
return null;
return getThisConnectorRaw(className);
}
/** Instantiate a connector, but return null if the class is not found.
*/
protected T getThisConnectorRaw(String className)
throws ManifoldCFException
{
try
{
Class theClass = ManifoldCF.findClass(className);
Class[] argumentClasses = new Class[0];
// Look for a constructor
Constructor c = theClass.getConstructor(argumentClasses);
Object[] arguments = new Object[0];
Object o = c.newInstance(arguments);
try
{
return (T)o;
}
catch (ClassCastException e)
{
throw new ManifoldCFException("Class '"+className+"' does not implement IConnector.");
}
}
catch (InvocationTargetException e)
{
Throwable z = e.getTargetException();
if (z instanceof Error)
throw (Error)z;
else if (z instanceof RuntimeException)
throw (RuntimeException)z;
else if (z instanceof ManifoldCFException)
throw (ManifoldCFException)z;
else
throw new RuntimeException("Unknown exception type: "+z.getClass().getName()+": "+z.getMessage(),z);
}
catch (ClassNotFoundException e)
{
return null;
}
catch (NoSuchMethodException e)
{
throw new ManifoldCFException("No appropriate constructor for IConnector implementation '"+
className+"'. Need xxx().",
e);
}
catch (SecurityException e)
{
throw new ManifoldCFException("Protected constructor for IConnector implementation '"+className+"'",
e);
}
catch (IllegalAccessException e)
{
throw new ManifoldCFException("Unavailable constructor for IConnector implementation '"+className+"'",
e);
}
catch (IllegalArgumentException e)
{
throw new ManifoldCFException("Shouldn't happen!!!",e);
}
catch (InstantiationException e)
{
throw new ManifoldCFException("InstantiationException for IConnector implementation '"+className+"'",
e);
}
catch (ExceptionInInitializerError e)
{
throw new ManifoldCFException("ExceptionInInitializerError for IConnector implementation '"+className+"'",
e);
}
}
}