/*

* Copyright 2012 LinkedIn, Inc

*

* Licensed 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 com.linkedin.parseq;

import java.util.Collection;

import java.util.Collections;

import java.util.Iterator;

/**

* An exception representing multiple exceptions. Useful for example to deliver multiple

* exceptions to a callback interface which only accepts a single Exception.

* @author Steven Ihde

*/

public class MultiException extends Exception

{

private static final long serialVersionUID = 1L;

private final Collection<? extends Throwable> _causes;

public MultiException(String message, Collection<? extends Throwable> causes)

{

super(message);

_causes = (causes == null ? Collections.<Throwable>emptyList() : causes);

// Let the first exception be the cause so at least something shows up in the stack

// trace; we can't just override printStackTrace() because OUR printStackTrace() is

// not invoked when this exception is the cause of another.

Iterator<? extends Throwable> i = _causes.iterator();

if (i.hasNext())

{

initCause(i.next());

}

}

public MultiException(Collection<? extends Throwable> causes)

{

this(null, causes);

}

public Collection<? extends Throwable> getCauses()

{

return _causes;

}

@Override

public String toString()

{

// MultiException: Xyz failed (multiple causes follow; only first is shown in stack trace): [java.lang.FooException: bar, java.lang.BazException: quux]

return super.toString() + " (multiple causes follow; only first is shown in stack trace): " + _causes;

}

}