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/*******************************************************************************
* Copyright (c) 2008, 2009 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.utility.internal;
import java.io.Serializable;
/**
* Simple interface for allowing clients to pass an exception handler to a
* service (e.g. to log the exception). This is particularly helpful if the
* service executes on another, possibly inaccessible, thread.
* <p>
* Provisional API: This interface is part of an interim API that is still
* under development and expected to change significantly before reaching
* stability. It is available at this early stage to solicit feedback from
* pioneering adopters on the understanding that any code that uses this API
* will almost certainly be broken (repeatedly) as the API evolves.
*/
public interface ExceptionHandler {
/**
* The specified exception was thrown. Handle it appropriately.
*/
void handleException(Throwable t);
/**
* Singleton implementation of the exception handler interface that does
* nothing with the exception.
*/
final class Null implements ExceptionHandler, Serializable {
public static final ExceptionHandler INSTANCE = new Null();
public static ExceptionHandler instance() {
return INSTANCE;
}
// ensure single instance
private Null() {
super();
}
public void handleException(Throwable t) {
// do nothing
}
@Override
public String toString() {
return "ExceptionHandler.Null"; //$NON-NLS-1$
}
private static final long serialVersionUID = 1L;
private Object readResolve() {
// replace this object with the singleton
return INSTANCE;
}
}
/**
* Singleton implementation of the exception handler interface that
* wraps the exception in a runtime exception and throws it.
*/
final class Runtime implements ExceptionHandler, Serializable {
public static final ExceptionHandler INSTANCE = new Runtime();
public static ExceptionHandler instance() {
return INSTANCE;
}
// ensure single instance
private Runtime() {
super();
}
public void handleException(Throwable t) {
// re-throw the exception unchecked
throw new RuntimeException(t);
}
@Override
public String toString() {
return "ExceptionHandler.Runtime"; //$NON-NLS-1$
}
private static final long serialVersionUID = 1L;
private Object readResolve() {
// replace this object with the singleton
return INSTANCE;
}
}
}
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