/**
* Copyright (c) 2002-2013 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.helpers;
import java.lang.reflect.InvocationTargetException;
public class Exceptions
{
private static final String UNEXPECTED_MESSAGE = "Unexpected Exception";
public static <T extends Throwable> T withCause( T exception, Throwable cause )
{
try
{
exception.initCause( cause );
}
catch ( Exception failure )
{
// OK, we did our best, guess there will be no cause
}
return exception;
}
public static RuntimeException launderedException( Throwable exception )
{
return launderedException( UNEXPECTED_MESSAGE, exception );
}
public static RuntimeException launderedException( String messageForUnexpected, Throwable exception )
{
return launderedException( RuntimeException.class, messageForUnexpected, exception );
}
public static <T extends Throwable> T launderedException( Class<T> type, Throwable exception )
{
return launderedException( type, UNEXPECTED_MESSAGE, exception );
}
public static <T extends Throwable> T launderedException( Class<T> type, String messageForUnexpected,
Throwable exception )
{
if ( type.isInstance( exception ) )
{
return type.cast( exception );
}
else if ( exception instanceof Error )
{
throw (Error) exception;
}
else if ( exception instanceof InvocationTargetException )
{
return launderedException( type, messageForUnexpected,
( (InvocationTargetException) exception ).getTargetException() );
}
else if ( exception instanceof RuntimeException )
{
throw (RuntimeException) exception;
}
else
{
throw new RuntimeException( messageForUnexpected, exception );
}
}
private Exceptions()
{
// no instances
}
}